Centre for Applied Nursing Research,
Liverpool NSW
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Systematic Review
Central Line Dressing Type and Frequency
| Reviewer ID |
CPRN |
| Review number. |
0001 |
| Full title. |
How frequently and what type of central line dressing
in hospital inpatients prevent complications? |
| Short title. |
Central line dressings |
| Names of reviewers |
CPRN group one |
| Date commenced. |
18 September 1997 |
| Date last edited |
28 April 1998 |
| Date last updated |
20 January 1998 |
| Contact name: |
Sushila Agnihotri or Jenny Morris |
| Contact address |
Centre for Applied Nursing Research
Liverpool Health Service
PO Box 103
Liverpool 2170 |
| Telephone |
02 9828 3275 |
| Fax |
02 9828 3273 |
| Email |
CPRN@hotmail.com |
| Source of Support |
Dr. Maree Johnson,
Professor of Nursing
CANR South Western Sydney Health Service |
Links within this web page:
Background
Objectives
Criteria
Search strategy
Method
Factors that varied among studies
Summary
List of tables
References
BACKGROUND
The use of Central Venous Catheters (CVC) for long term nutrition, administration
of blood products, antibiotic therapy and haemodynamic monitoring has increased.
Catheter Related Septicaemia (CRS) is the most life threatening complication of
infusion therapy (Maki & Ringer, 1987). 10-14% of catheter sites become infected
with a reported CRS frequency of 3-7% (Babycos et al, 1990, Moro et al, 1994).
Factors associated with an increased risk of CVC infection include severity of
the patient's underlying illness, whether the catheter is single lumen or multiple
lumen, the use of the catheter for total parenteral nutrition and the placement
of the catheter in the femoral site compared with jugular or subclavian placement
(Hoffman et al., 1992). Other identified risk factors include the method of skin
disinfection prior to catheter insertion, the type of dressing material used,
the frequency of the dressing change, the frequency of catheter replacement, and
the use of antibacterial ointment at the catheter insertion site (Hoffman et al.,
1992; Prager et al., 1984).
Type of dressings
A CVC dressing is important as it provides a barrier impermeable to water
and bacteria (Shivnan et al., 1991), protects the catheter site from external
contamination, secures the CVC to prevent dislodgment, and discourages bacterial
proliferation near the insertion site (Treston-Aurand et al., 1997). The type
of dressing applied to the catheter site can influence the incidence of catheter
related infections (Moro et al., 1992; Lucas et al., 1992; Richet et al.; 1990).
The most common type of dressings used are transparent dressings and gauze-tape
dressings.
Transparent dressings are widely used as they not only provide an occlusive dressing
that enables continuous inspection of the central line site, but also reduce the
number of weekly dressings required. Transparent dressings are also more comfortable
(Wille et al., 1993) and allow patients to continue their everyday activities.
Nursing time in dressing change is minimised, both for the time taken per dressing
and also for the frequency of the dressing change (Shivnan et al., 1991). Whilst
transparent dressings have been shown to be cost effective in bone marrow transplant
patients-$27.96 for transparent dressing compared to $87.08 for gauze dressing
(Brandt, DePalma, Irwin et al.; 1996), the disadvantages are that accumulated
blood, sweat and exudate under the dressing can be an excellent culture medium
for organisms (Reynolds et al., 1997:26). Several studies have raised the possibility
that transparent dressings may increase the risk of catheter-related infections
(CRI) (Callahan et al., 1987; Conly et al.; 1989, Hoffmann et al., 1992; Petrosino
et al., 1988; Powell et al., 1982; Richet et al., 1990), but prospective randomised
trials have not confirmed that transparent dressings are associated with an increase
in catheter-related blood stream infection (Young et al., 1988; Palidar et al.,
1982; Nehme & Trigger, 1984; Andersen et al., 1986).The permeability of the
transparent dressing can be an important factor as porousness of the dressing
material can result in a less favorable environment for potential pathogens and
reduce the risk of CVC related sepsis (Reynolds et al., 1997:26).
Hoffman et al. (1992) using a meta-analysis approach compared the complication
risks of transparent and gauze dressings for central and peripheral venous catheters
and found no significant relationship between dressing type and the incidence
of phlebitis, bacterial infiltration and skin colonization. However, there was
a significant relationship between catheter tip colonization and dressing type.
The use of transparent dressings increased the relative risk of catheter tip colonization
by 53% in central and peripheral catheters. Catheter tip infection is an excellent
prediction of bacteremia and sepsis (Hoffman et al, 1992: 2074).
Frequency of dressing change
The frequency of CVC dressing change can vary from daily to weekly and
is generally dependent on the material type of the dressing. Gauze-tape dressings
tend to be changed more frequently, either daily or second daily, whilst transparent
dressings tend to be changed once or twice a week (Less frequently changed transparent
dressing is comparable in terms of associated CVC related infection rates.) (Lawson
et al., 1986; Nehme & Trigger, 1984; Palidar et al., 1982; Vasquez & Janard
1984; Young et al., 1988). The type and frequency of dressing change plays an
important role in the cost of the vascular dressing.
The Centers for Disease Control (CDC) and Prevention's Guidelines for Prevention
of Intravascular Device-Related Infections for CVC do not recommend any specific
dressing type or the frequency of the dressing change. CDC recommends replacing
the dressing for peripheral venous catheters and central venous catheters when
the catheter is changed or when the dressing becomes damp, loosened, or soiled
or when inspection of the site is necessary (Centers for Disease Control Guidelines
for Intra Vascular Devices, March 1997).
There are no clear guidelines with regard to the most suitable type of dressing
to use and the frequency of dressing change that is most effective. This review
aims to assess research studies to evaluate if dressings can affect the incidence
of complications in patients with CVC lines and to identify the most suitable
central line dressing and the frequency of the dressing change necessary.
OBJECTIVES
The objectives of this review are to determine:
i. the most effective type of central line dressing to use and
ii. the frequency of the dressing change that is necessary in all hospital
inpatients.
The outcomes of interest are:
i. mortality
ii. local and systemic infection
iii. catheter displacement
iv. thrombus formation
v. catheter breakage or blockage
vi. skin irritation or allergic reaction that is a direct result of the dressing
type and/or frequency of the dressing change.
CRITERIA FOR CONSIDERING STUDIES FOR THIS REVIEW
This review assesses research studies on all central venous catheter sites:
i. with a sample population of 30 or more in hospital subjects
ii. that either evaluate a dressing material or compare types of dressing materials
iii. and/or the frequency of the dressing change with regards to the above
identified outcomes.
Definition of CVC
A CVC is defined as any non tunneled percutaneously inserted catheter with
the catheter tip in the superior vena cava. This includes CVCs inserted into the
internal jugular vein, the subclavian vein, the femoral vein and Peripherally
Inserted Central Catheters (PICC).
Types of participants
Inclusions
All age participants, both male and female treated in a hospital setting with
a central venous catheter insitu are included in this study. No participants with
any predisposing health risk factors are excluded. All CVC compositions, single
and multiple lumen whether antiseptic or antibiotic bonded, tunneled and non-tunneled
catheters, in any insertion site are included. CVC for short term and long term
vascular access usage to administer IV fluids, medications, blood products, parenteral
nutrition and haemodynamic monitoring are included.
Exclusions
Arterial and Pulmonary catheters
Articles that do not specifically identify catheters as being CVC
Non specific intravenous lines or peripheral lines
Articles that do not specifically evaluate dressing type or frequency of the
dressing change
Articles that do not assess outcomes of local or systemic infection, catheter
displacement or reaction to the dressing
Outpatient and hospital in the home population
Studies that refer to dressing technique and /or catheter placement site
Studies that are a review or discussion of the general care of central venous
catheter sites.
Types of interventions
This review assesses evaluations and/or comparisons of all types of dressing
material and all frequencies of dressing change for any central venous catheter
site in any age in-hospital population.
Types of outcomes
The main outcomes of interest are complications that are caused as a direct
result of the type of dressing and/ or the frequency of the dressing change. The
identified complications are mortality, local or catheter related infection, systemic
infection or catheter related sepsis, catheter displacement, thrombus formation,
catheter breakage or blockage, skin irritation or allergic reaction to the dressing.
Definitions of outcomes
Exit site infection
identified by any one or more of the following symptoms - erythema, tenderness,
skin necrosis, phlebitis, swelling, exudate including purulence, pain.
Catheter Related Infection (CRI )
identified by positive quantitative or semiquantitative culture of the catheter
>15 colony forming units.
Catheter Related Sepsis (CRS)
identified by signs and symptoms consistent with:
i. infection (including defervescence or clinical signs of infection prior
to removal of catheter) and fungaemia or bacteraemia or
ii. a positive catheter tip culture or fever and bacteremia or
iii. fungemia in the absence of an exit site or tunnel infection.
Bacteraemia
Identified when there is a positive blood culture from the central venous catheter.
Complications due to catheter material, catheter size, site of catheter placement
and composition of the intravenous fluid are acknowledged as being identified
in the literature but have not been analysed separately in this review.
Types of studies
Any research study with a sample population of over 30, that evaluates and/or
compares studies of one or more dressings type, and/or frequency of dressing change
for a central venous catheter site.
SEARCH STRATEGY FOR IDENTIFICATION OF STUDIES
The search was restricted to English language articles that were published
after 1980. The search strategy and the search process of the identification of
articles was documented.
Search terms used
vascular catheters, central venous catheters, central venous therapy, peripherally
inserted central catheters, parenteral nutrition, wound infection, dressing, dressings,
occlusive dressings, biological dressings, transparent dressings, bandages and
dressings, infection control, complications, and Boolean combinations of the above.
Electronic database search
The electronic databases searched were Medline 1981 - September 1997, CINAHL
1982 - July 1997, HealthStar 1975 - September 1997, and the Cochrane Library 1997
Issue 3. All abstracts and presentations identified were followed up by searching
for the authors collectively as well as searching each cited author, individually.
Hand search
The CINAHL and Medline journal index were searched to identify journals that
were not catalogued in these databases.
Full text hand searches of the Journal of Intravenous Nursing January 1994
- August 1997, Intravenous Connections - NSW Nurses Intravenous Society January
1996 - September 1997, Australian Clinical Review 1981 - 1993 and Journal of Critical
Care 1986 - August 1997 were conducted.
Reference list search
Potential articles that satisfied the Inclusion/Exclusion criteria were retrieved.
All reference lists of the potential articles identified were searched. Papers
published prior to 1980 were identified, excluded, and not retrieved.
The reference list of 434 articles from the Guidelines for Prevention of Intravascular
Device-Related Infections from the Centers for Disease Control and Prevention,
Atlanta, Georgia, March 1997 was searched and 2 new articles were retrieved.
Unpublished articles
Two 1997 conference presentations were identified. The authors were contacted.
No data is available till publication early next year.
Other
Expert opinion and guidance was sought from the Clinical Nurse Consultant for
Central lines, Tim Spencer, Liverpool Health Services, South West Sydney Area
Health Service. He commented that he felt that the sources searched were comprehensive
and could offer no further suggestions.
Towards the end of the search process, searching of the reference list of the
articles retrieved identified repeat articles and no new articles were being identified.
This indicated to us that the search process was comprehensive and there were
no new articles left to retrieve.
METHOD OF THE REVIEW
Data abstraction:
In all a total of 146 possible articles was identified. Forty-four articles
were repeated either in more than one electronic database or in the reference
lists of identified articles. Thirty-two articles were not CVC or did not assess
dressing type or dressing frequency. A total of seventy articles were retrieved.
When the Inclusion/Exclusion criteria were applied to the title and abstract,
thirty-seven potential studies were identified. (One of these was a meta analysis
of transparent polyurethane film as an intravenous catheter dressing.) Sixteen
of these articles were subsequently excluded. The reasons for exclusion were:
not evaluating dressings, not evaluating identified complications, includes arterial
catheters, peripheral IV catheters, dressing type identified only as regular.
The search strategy, search process, Inclusion/Exclusion criteria, Exclusion
of Potential Studies and the Data Abstraction forms were developed by the CPRN,
trialed, and refined. Two reviewers of the Clinical Practice Review Network independently
assessed each article to be included in the review by applying the Inclusion/Exclusion
criteria. Following the inclusion of the article for review, data extraction of
each article was conducted independently by two reviewers. The reviewers were
not blinded. Any disagreements were resolved by the project leaders.
Description of studies (see Table 1)
Twenty-one studies were identified. One cohort study (Moro, M., Lepri, V. et
al. 1994), two experimental studies (Brandt, B., DePalma, J. et al, 1996; Shivnan,
J., McGuire, D. et al 1991), one quasi experimental study (Freiberger, D., Bryant,
J. et al 1995) and one clinical trial study (Willie, J., Albas, B. et al. 1993)
were identified. Thirteen of the studies were case series of comparative studies
of two or more dressing types and three studies evaluated a single dressing type.
The study sizes ranged from 32 to 3931 participants. The age range of eighteen
studies was from one day to 91 years of age. Three studies did not identify the
age range of the participants. Sixteen studies evaluated both dressing type and
frequency of dressing change. Five studies evaluated dressing type with the frequency
of dressing change not identified.
The type of patients identified were medical/ surgical (10 studies), total
parenteral nutrition (6 studies), bone marrow transplant (3 studies), one chemotherapy,
and one study did not describe the patients involved.
In six studies central lines were used for TPN therapy, in three studies for monitoring
and antibiotic therapy and in one study for chemotherapy. Eleven studies did not
disclose the use of the CVC.
The location of the central lines were subclavian and jugular (5 studies),
subclavian (4 studies), jugular (1 study), subclavian and cubital (1 study), subclavian,
jugular and cubital (1 study), subclavian, jugular and femoral (1 study). Eight
studies did not identify the location of the CVC.
The studies were conducted at tertiary teaching hospitals in twelve studies,
two tertiary teaching hospitals and five large non teaching hospitals in one study,
district hospital in one study, and seven were not identified
Table 1: Characteristics of included studies
Methodological quality of included studies
The method of allocation of participants to seven studies was random with participants
in one study assigned consecutively, in two studies assigned sequentially, in
three studies assigned by hospital number and in one study assigned by date of
birth. The method of random allocation in eight studies was not described. One
study did a retrospective audit of medical records, four studies included all
participants and one study did not identify the method of allocation of participants
to the study.
The attrition rate identified in five studies was 5 out of 79 participants,
12 out of 32 participants, 22 out of 145 participants, 0 out of 365 participants
and 61 out of 104 participants. Fifteen studies did not identify the attrition
rate. None of the studies described any method of blinding.
Quality of Evidence (see Table 2 and Figure 1)
To assess the quality of the evidence, the studies were scored using weighted
variables. The best possible score was 18 and the worst possible score was 46.
The mean score of the studies was 29.67, with a median score of 30, a mode score
of 29, and a standard deviation of 3.76. Four studies scored 27 or under with
twelve studies scoring between 28 to 30 and five studies scored over 30.
Table 2. & Figure 1. Weighting of included studies
FACTORS THAT VARIED AMONG STUDIES
There were several factors that varied amongst the twenty one studies.
Location of CVC
The CVC sites identified were subclavian in four studies, jugular in one study,
subclavian and jugular in five studies, subclavian and cubital in one study, subclavian,
jugular and cubital in one study and subclavian, jugular and femoral in one study.
Eight studies did not identify the location of the CVC.
Clinical use of the CVC
The CVC lines were used for the following purposes-TPN in six studies; monitoring,
antibiotic therapy and TPN in three studies; chemotherapy in one study; and eleven
studies did not identify the reason for use of the CVC line.
Insertion technique and skin disinfection
13 CVCs were inserted by doctors, with 4 CVCs inserted in the operating theatres
by an anaesthetist and 2 CVCs inserted either in the operating room or the intensive
care unit. Nine studies did not identify the person insertinging the CVC. The
technique used to insert the CVC was aseptic in eleven studies, protocol in two
studies, sterile gloves in one study, and not identified in seven studies.
The disinfection solutions in inserting the CVC were povidone iodine in three
studies, acetone alcohol and povidone iodine in two studies, iodine and povidone
iodine in one study, iodine in two studies, iodine and alcohol in one study, iodine
and chlorhexidine 70% in one study, 0.5% aqueous chlorhexidine in one study.
Nine studies did not identify the skin disinfection solution used at insertion
of the CVC.
Regimen/technique for dressing change
The disinfection solutions used were acetone alcohol and povidone iodine in
seven studies, povidone or Hibiclens in one study, acetone alcohol and aqueous
chlorhexidine gluconate 0.5% in one study, aqueous chlorhexidine gluconate 0.5%
in one study, 70% alcohol in one study, 70% alcohol and 2% chlorhexidine in one
study, and hydrogen peroxide and povidone iodine in one study. In one study the
dressing solutions used were described as published standard guidelines (which
were CDC guidelines), and in seven studies it was not identified.
Health status of patient
The predisposing health factors were carcinoma in five studies; carcinoma,
cardiovascular disease and gastrointestinal disease in 2 studies; gastrointestinal
disease in one study; and major surgery in one study. In one study the patients
were immunosuppressed. Eleven studies did not identify the predisposing health
status of the patients.
Bacteriological methods used to confirm infection
The bacteriological methods used to confirm local and systemic infection of
the CVC were one or more of the following: blood sample from the CVC, skin culture
of insertion site, blood sample from peripheral site and CVC tip culture.
`Blood sample from the CVC
Samples were taken from all patients in nine studies, patients suspected with
CRI in two studies, and not identified in ten studies.
Skin culture of insertion site
The skin culture of the CVC site was performed in thirteen studies-in all patient
in ten studies, in patients with suspected infection in one study, in 75 out of
103 patients in one study due to laboratory difficulties, and not identified in
one study. Skin cultures were done at the time of insertion of the CVC and/or
during dressing change and/or at the time of the removal of the CVC. Nine studies
did not identify whether skin cultures of the CVC was performed.
Blood sample from peripheral site
Blood samples were taken from another peripheral site in all patients in 6
studies and in patients with suspected CRS in 2 studies. 13 studies did not identify
if a blood sample was taken from another peripheral site.
CVC tip culture
The CVC tip was cultured for all patients in 13 studies, for patients suspected
with CRI in 4 studies. 4 studies did not identify if CVC culture tip was performed.
Additional variables that may affect the infection risks associated with
CVCs
i.. The duration of catheter use
The duration of catheter use varied from 2 days to 120 days in 12 studies.
9 studies did not identify the duration of CVC use.
ii. The frequency of dressing change
The frequency of dressing change was daily, second daily, three times a week,
weekly and every 7 to 10 days. 5 studies did not identify the frequency of dressing
change.
iii. The use of antiseptic ointment at the insertion site
7 studies used Betadine ointment at the insertion site of the CVC and 1 study
used an antibiotic ointment consisting of bacitracin, neomycin and polymyxin.
SUMMARY OF ANALYSES
Results
Tables 4-19 present the results of the data abstraction.
Discussion
Limitations of the review process
The limitations of the review process were that only English language and published
articles were used. The search included articles from 1980 onwards as, prior to
this period, there was little use of and information on the use of central lines.
The time frame of the project limited the hand searching. Articles that were identified
for the review, but which did not provide adequate information, were followed
up with search of author names that appeared on the article as well as search
of individual author names. No authors were contacted directly. All abstracts
and presentations identified were followed up by searching for the authors collectively
as well as searching each cited author individually.
Limitations of the studies
Type of studies identified
No RCT or CCT studies were identified. The 21 studies used in this Systematic
Review were:
1 cohort study (Moro, 1994), 2 experimental studies (Brandt ,1996; Shivnan,
1991), 1 quasi experimental study (Freiberger, 1992), 1 clinical trial (Wille,
1993), 13 case series (Reynolds, 1997; Treston-Aurand, 1997; Maki ,1993; Conly,
1989; Young, 1988; Lawson, 1986; Andersen, 1986; Wheeler, 1986; Powell, 1985;
Prager, 1984; Nehme, 1984; Palidar, 1982; and Powell, 1982) and 3 evaluation studies
(Taylor, 1996; Engervall, 1995; and Vazquez, 1984) were identified.
Weighting of the studies
No suitable scale to evaluate the quality of the studies was identified. The
CPRN team designed a scale based on Ciliska et.al 's (1996) method of evaluation
of using weighted variables. Important factors contributing to the complication
rates in CVCs were identified. The variables used were: type of study, allocation
to the study, sample size, predisposing health status of the participants, type
and site of CL, insertion technique, the use of the CL, duration the CL was in
situ, the reason for removal of the CL, dressing frequency, attrition rate, antibiotic
therapy and the bacteriological method used to identify local and systemic infection.
The studies were then assessed using this weighted scale. With a best score of
18 and a worst score of 46, four studies scored from 22 to 27 inclusive; and the
remaining seventeen studies scored from 28 to 36. The studies were graded using
the following scale:
18-27 good quality, 28-37 medium quality, 38+ poor quality.
This resulted in four good quality studies; 17 studies of medium quality, and
no poor quality studies were identified.
CVC related infections
There are numerous factors associated with CVC related infections and the role
played by specific factors in increasing the risk of infection is not entirely
clear.
Skin colonization and CRI
Skin colonization is a major determinant for endemic CRI and heavy colonization
of the insertion site is highly predictive of CRS. Septicaemias begin with invasion
of the transcutaneous insertion tract by microorganisms from the patient's skin
flora (Maki & Ringer 1993, Nehme & Trigger 1984). Microbial colonization
of the CVC is the most frequent factor limiting their prolonged used and is attributed
to skin organisms that either migrate down fibrin sleeves or are introduced during
placement of the CVC (Prager & Silva 1984).
Conly et al. (1989) analyzed 20 variables to predict the occurrence of CRI
or CRS using stepwise multiple logistic regression analysis. Cutaneous colonization
at the insertion site of > 103 cfu/ml (relative risk 13.16) and difficulty
of insertion (relative risk 5.39) were significant factors for CRI. Moro et al.
(1994), also using logistic regression, confirmed the importance of skin
colonization and hub colonization in causing CRI. Other factors identified as
being responsible for skin colonization are age, jugular insertion site, duration
of the CVC catheterization and the use of transparent dressing.
Influence of dressing type on CRI
Several studies have raised the possibility that transparent dressings may
increase the risk of CRI. Conly et al. (1989) found significantly greater skin
colonization after 48 hours of CL insertion in the transparent versus gauze dressing
(p < 0.009). They suggest that transparent dressings are associated with significantly
increased rates of insertion site colonization, local catheter related infection,
and systemic catheter related sepsis in patients with long term CVC after finding
that local CRI in the gauze dressing group was less than in the transparent dressing
group (p <0.002).
Andersen et al., (1986) [good quality] in their non-randomized study comparing
gauze dressings with transparent (Opsite) dressings, found more phlebitis and
catheter tip infection when a transparent dressing was used. Differences in the
frequency of positive tip culture, positive skin culture and clinical signs of
local infection at the skin puncture site were significant (p < 0.05) between
the gauze dressing group (5/75) and the transparent dressing group (15/60). The
mean function time of the catheters with positive tip or skin culture was significantly
lower in the transparent dressing group than in the gauze dressing group (p <
0.001).
Treston-Aurand and Olmsted (1997) [medium quality], in their non-randomized
retrospective study, demonstrated that the use of transparent or tape and gauze
dressings resulted in fewer CRIs (p < 0.001) than Highly Permeable Transparent
Dressing (HPTD).
Vazquez and Jarrard (1984) [medium quality] claim that transparent dressings
inhibit bacterial growth, but have failed to carefully evaluate bacterial growth
beneath the dressings in high risk patients over an extended period of time.
Maki and Ringer's (1993) [medium quality] prospective randomized study
found the mean colonization of catheter exit sites and local CRI was higher in
the transparent dressing group than in the gauze dressing group but the results
were not statistically significant.
Shivnan et al's (1991) [good quality] prospective randomized study found fewer
infections with gauze dressings. Only a small portion (4%) developed exit site
infection or CRS even though 36% had a positive blood culture. The limitation
of this study was that it was not large enough (n = 98) to allow analysis of differences
between subgroups, and therefore we cannot conclude that the low incidence of
CRS is related to the type of dressing used.
Powell and Regan (1982) [medium quality] in their prospective randomized
study compared transparent versus gauze dressings for TPN and demonstrated a consistent
but not significant increase in CRI in the group receiving transparent dressings.
Brandt et al (1996) [medium quality] and Lawson et al (1986) [medium
quality] found no statistical difference in CVC related infection between
gauze and transparent dressings.
Hoffman et al (1992) carried out a meta analysis of seven studies (Powell et
al., 1982; Andersen et al., 1986; Conly et al., 1989; Maki & Ringer, 1987;
Littenberg & Thompson ,1987; and Hoffman et al., 1988) of CVCs and found no
significant relationship between dressing type and the incidence of phlebitis,
bacterial infiltration and skin colonization but concluded that there was a significant
increase in the risk of catheter tip infection when using transparent dressings
as opposed to gauze dressings (RR 1.78, 1.38-2.30).
Influence of dressing frequency on CRI
Less frequently changed transparent dressings have been supported in the literature
not because of a correlation with a reduction in CRS but mainly due to cost reduction
in the overall number of dressings used per CVC site as well as the subsequent
reduction in nursing time necessary.
Lawson et al. (1986) [medium quality] compared gauze dressings changed three
times a week to transparent dressings changed weekly and found no statistical
difference but concluded that cost could be reduced by using transparent dressings.
Nehme and Trigger (1984) [medium quality] compared gauze dressings changed every
second day and transparent dressings changed weekly and found no difference in
the prevention of CRS but concluded that Opsite was time and cost effective, versatile
and easy to apply.
Palidar et al. (1982) [medium quality], in their retrospective non-randomized
study comparing gauze dressings changed twice a week and transparent dressings
changed once a week, came to the same conclusion.
Shivnan et al (1991) [good quality], whilst finding no difference in CRS rates
between gauze dressings and transparent dressings found that nursing times and
dressing costs were significantly reduced in the transparent dressing group (p
< 0.0001) when compared to the gauze dressing group (p<0.000). Overall patient
comfort in the transparent group was reported as p<0.001.
Wheeler et al. (1988) compared gauze dressings changed three times a week to
transparent dressings changed once a week and found no statistical difference
in infection rates but noted that transparent dressings showed significant time
and expense savings and offered superior occlusive protection.
Young et al. (1987) [good quality] compared gauze dressings changed three times
a week with transparent dressings changed twice weekly, weekly, and every ten
days. They found no significant differences between the groups and recommended
the use of transparent dressings changed weekly with a safety margin of 10 days
based on savings in cost and nursing time.
Engervall et al. (1995) compared transparent dressings changed once a week
to transparent dressings changed twice a week and concluded that twice a week
dressing change is superior to once a week dressing change. The once a week group
had more positive CVC tip cultures (p < 0.05), more cultures from the exit
skin site showing higher numbers of colony forming units (p 0.07) and more gram
positive septicaemias (p 0.08).
Effect of antiseptic solution for skin preparation
Two factors associated with infection related phlebitis are the skin preparation
and the frequency of the dressing change.
Maki and Ringer1(993) [medium quality] compared the effect of 2% chlorhexidine,
70% alcohol and 2% povidone iodine. The CVCs in the chlorhexidine 2% group, were
less likely (p 0.02) to show local CRI on removal than were catheters in the povidone
iodine group. Chlorhexidine 2% significantly prevented local CRI (p 0.02) and
showed a strong trend towards significant benefit in the prevention of catheter
related bacteremia (p 0.18).
Freiberger and Bryant (1992)[medium quality] demonstrated no significant differences
in incidence of bacterial growth between dressings groups of Betadine and Tegaderm,
Betadine and Gauze, Hibiclens and Tegaderm, Hibiclens and gauze. The limitation
was the use of a convenience sample rather than probability sampling and the duration
of the study. The sample was not large enough to determine if one dressing was
better than the other in decreasing the incidence of infection.
Bacteriological methods
The contamination of an intravenous pathway may be manifested by local infection
of the insertion site, septic phlebitis or thrombophlebitis or septicaemia or
bacteremia. The methods of diagnosing infection can be semi quantitative or quantitative.
Speechley (1986:95) identified the bacteriological methods used to confirm local
and systemic infection of the CVC as one or more of the following: catheter lumen
flushed through with broth, the catheter tip rolled on blood agar, the CVC lumen
cleaned with stilleto and then rolled onto blood agar, the catheter tip cultured
in broth, the catheter tip is gram stained, the insertion site is swabbed and
blood specimen collected from the CVC site and/or a site different to the CVC.
The categories of CVC infection identified and the methods used to diagnose CRI
and CRS were different and posed a significant problem in the translation and
comparison of results between the studies. The redness of the CVC site is often
taken to be an indication of infection but it may not be associated with higher
bacterial count but may mean irritation. The insertion site may have bacterial
growth even though there is no redness, therefore a culture is the best measure
for determining exit site infections (Freiberger & Bryant, 1992). Nine studies
in this review did not identify whether exit site colonization of the CVC had
been done. Diagnosis of CRI requires a positive catheter tip culture >15 colony
forming units. Four studies did not identify if the catheter tip had been cultured.
Diagnosis of CRS requires either a positive catheter tip culture or fever and
a positive blood culture from the central venous catheter and was not identified
in 10 studies.
Conclusions
The numerous differences between patient groups and research design methods
indicated that the studies were not similar enough for either comparison or meta-analysis.
The numerous variables associated with CVC related infections and the role played
by specific factors in increasing the risk of infection is not entirely clear.
The evidence was inconclusive to substantiate that any one type of dressing or
frequency of dressing change was superior in preventing CVC complications.
The most effective defence mechanism against the introduction of bacteria to the
catheter site is sterile technique. Failure to adopt adequate aseptic technique
is likely to increase the risk of skin and hub colonization (Moro et al., 1994).
A co-relation between localized infection complications and systemic infections
was demonstrated by Speechley, 1986. Patients with phlebitis showed an 18 fold
risk of septicaemia and 25% of patients with local inflammation developed systemic
infection and positive blood cultures. Disinfection of the catheter insertion
site and strict dressing protocols are important steps in the prevention of CRI.
Conly et al (1989) demonstrated an association between skin colonization and CRS.
Shivnan et al. (1991) demonstrated fewer infections with gauze dressings even
though positive blood cultures were high. Strict dressing protocol was identified
as one of the reasons for the reduced infection rate. Transparent dressings have
been advocated as useful in determining the occurrence of CRS by frequent visualization
of the catheterization site but this should not be relied upon as inflammation
may be due irritation rather than infection.

Implications for practice
Inconclusive evidenceexists as to the effectiveness of any particular type
of CVC dressing or frequency of dressing change. Although transparent dressings
have been found clinically if not consistently stastically to increase risk
of catheter-related infections, the cost implications of reduced frequency of
dressings and reduction in nursing time have also played an important part in
clinical decision making. The use of the transparent dressing and the potential
for shanging every 10 days may be considered. Many studies have used the once
per 7 days dressing change; only one study examined the 10 day option, although
it was supported. The quality of the evidence is medium to good and does provide
clinicians with access to no other source of evidence with some beginning points
for decision making. These studies and their implications should be reviewed
and debated by clinicians to shape practice. However, it is recommended that
strict aseptic techniques for the placement and care of CVC be employed in the
care of central line dressings.
Implications for research
More research is needed to identify the effect of dressings on CVC related
infections. Literature on the subject of central line infections show a lack of
consensus on research methods as well as operational definitions of the terms
used. For comparison, interpretation and synthesis of studies, the definition
used must clearly convey the intended meaning. Clarification about the bacteriological
methods used to identify, skin colonization, CRI and CRS is also necessary.
Duration of the CVC placement as well as host factors have been identified as
important factors contributing to CRI. The roles of these important contributing
factors should be clearly identified.
All Reviewers
At the recruitment phase, all potential reviewers completed a self assessment
of their educational level and skill levels. The average years of nursing experience
for all reviewers was 14.707 years. Skill levels on a scale of where 1 = unskilled
and 4 = skilled, library catalogue skills was 2.595, computer skills searching
the medline and CINAHL database was 2.119, critiquing skills of articles was 2.309
and summarising skills of articles was 2.523.
| Hospital |
Yrs of Experience |
Library Catalogue |
Medline CINAHL |
PreCritique |
PreSummary |
| Bowral |
13 |
2 |
1.5 |
2.5 |
2.5 |
| Camden |
14.33 |
2 |
2 |
2 |
2 |
| Campbelltown |
16.454 |
2.181 |
2 |
2 |
2.181 |
| Bankstown |
12.333 |
3 |
1.9 |
2.5 |
2.7 |
| Fairfield |
20 |
2.5 |
1.5 |
2 |
2.5 |
| Liverpool |
14.428 |
2.857 |
2.571 |
2.5 |
2.785 |
| All hospitals |
14.7.7 |
2.595 |
2.119 |
2.309 |
2.523 |
| Who inserted, technique insertion, method of analysis, bacteriological
diagnostics |
| Author |
Who Inserted |
Tech of insertion |
Dress tech |
Stat analysis |
Blood CVC |
Skin culture |
Blood other |
Cath tip cult |
| Anderson |
anaes |
aseptic |
NI |
Chi, Yates, Wilcoxon |
all |
all |
all |
all |
| Brandt |
NI |
NI |
alcoh, PI, PIO |
Mann Whitney |
all |
susp inf |
all
febrile |
|
| Conly |
OR |
aseptic |
CDC guide |
Chi, Yates
orFishers, Mann Whitney |
NI |
|
|
|
| Engervall |
OR |
aseptic |
70% ethanol |
Mann Whitney |
not all |
all |
not all |
all |
| Lawson |
NI |
NI |
alcoh, PI, PIO |
Chi |
NI |
NI |
NI |
NI |
| Freiberger |
OR |
NI |
povidone, Hibiclens |
Chi |
NI |
insert removal |
NI |
NI |
| Maki |
Dr |
s/ gloves |
PI or &0% alcoh or 2% chlorhex |
Chi Fishers |
NI |
insert |
Ni |
proximal tip, hub infusate |
| Moro |
NI |
aseptic |
NI |
Chi |
NI |
? when |
NI |
hub |
| Nehme |
Dr |
aseptic |
alco, povidone |
Chi |
susp CRI |
NI |
NI |
all |
| Palidar |
Dr |
sterile |
alco, povidone |
NI |
NI |
NI |
NI |
all |
| Powell 82 |
Dr |
aseptic |
alcoh, PI, PIO |
stat NI |
all |
NI |
NI |
all |
| Powell 85 |
NI |
NI |
alcoh, PI, PIO |
stat NI |
all |
NI |
NI |
all |
| Prager |
Dr |
protocol |
NI |
Chi ttest |
NI |
all |
all |
all |
| Reynolds |
ITU/OR |
NI |
0.05% chlorhex |
stat NI |
NI |
all |
NI |
all |
| Shivnan |
NI |
NI |
peroxide, PI,antibio oint |
Chi |
all |
75/103 lab diff |
NI |
NI |
| Taylor |
NI |
NI |
alcoh, PI, PIO |
Wilcoxson |
NI |
insert removal |
NI |
NI |
| T/Aurand |
Dr |
aseptic |
NI |
Chi |
all |
all |
all |
CRI |
| Vazquez |
NI |
aseptic |
NI, PIO |
NI |
all |
NI |
NI |
all |
| Wille |
Anaes OR |
Protocol |
NI |
Maentel Haensel |
all |
NI |
all |
CRI |
| Wheeler |
NI |
aseptic |
NI |
NI |
all |
NI |
all |
CRI |
| Young |
ITU/OR |
aseptic |
alcoh chlorhex |
Chi Yates |
NI |
all |
CRS |
all |
| Key
NI = not identified
OR = opeerating room
PI = povidone Iodine
PIO = povidone Iodine ointment
ITU = intensive care unit
S/glove = sterile gloves
alcoh= alcohol
antibio= antibiotic
chlorhex = chlorhexiedine
stat NI = statistical not identified |

Studies included in this review
1. Andersen, P., Herlevsen, P., Schaumburg, H., 1986. A comparative study of
Opsite and Nobecutan gauze dressings for central venous line care. J. of Hospital
Infection 7:161-168.
2. Brandt, B., DePalma, J., et al. 1996. Comparison of central venous catheter
dressings inbone marrow transplant recipients. ONF 23. no.5:829-36.
3. Conly, J., Grieves, K., et al. 1989. A prospective, randomized study comparing
transparent and dry gauze dressings for central venous catheters. The Journal
of Infectious Diseases 159, no.2:310-319.
4. Engervall, P., Ringertz, S., et al. 1995. Change of central venous catheter
dressing twice a week is superior to once a week in patients with haematological
malignancies 29:275-286.
5. Freiberger, D., Bryant, J., et al. 1992. The effects of different central
venous line dressing changes on bacterial growth in a pediatric oncology population.
Journal of Pediatric Oncology Nursing 9(10:3-7.
6. Lawson, M., Kavanagh, T., et al. 1986. Comparison of transparent dressing
to paper tape dressing over central venous catheter sites. NITA Vol 9:40-43.
7. Maki, D., Ringer, M,. et al. 1993. Prospective, randomized trial of povidone-iodine,
alcohol and chlorhexidine for prevention of infection associated with central
venous and arterial catheters. CINA Vol 9,no.1:10-15.
8. Moro, M., Lepri, V., et al. 1994. Risk factors for the central venous catheter
related infections in surgical and intensive care units. Infection Control and
Hospital Epidemiology 15, no.4:253-264.
9. Nehme, A., Trigger, J., 1984. Catheter dressings in central parenteral nutrition-A
prospective, randomized comparative study. Nutritional Support Services 4(9) 42,48,50.
10. Palidar, P., Simonowitz D., et al. 1982. Use of Opsite as an occlusive
dressing for total parenteral nutrition catheters. Journal of Parenteral and Enteral
nutrition 6(1):150-151.
11. Powell, C. Regan, C. et al. 1982. Evaluating of Opsite catheter dressing
for parenteral nutrition: A prospective, randomized study. Journal of Parenteral
and Enteral nutrition 6(1): 43-47.
12. Powell,C. Traetow, M., et al. 1985. Opsite dressing study: A prospective,
randomized study evaluating povidone-iodine ointment and extension set changes
with 7 days Opsite dressing applied to total parenteral nutrition subclavian sites.
Journal of Parenteral and Enteral nutrition 9(3): 443-446.
13. Prager, R., Silva, J. 1984. Colonization of central venous catheters. Southern
Medical Journal Vol 77 no.4:458-461.
14. Reynolds, ., Tebbs, S., et al. 1997. Do dressings with increased permeability
reduce the incidence of central venous catheter related sepsis? Intensive and
Critical Care Nursing 13:26-29.
15. Shivnan, J., McGuire, D., et al. 1991. A comparison of transparent adherent
and dry sterile gauze dressings for long term central catheters in patients undergoing
bone marrow transplant. Oncology Nurses Forum 18(8):1349-1356.
16. Taylor, D., Myers, S., et al. 1996. Use of occlusive dressings on central
venous catheter sites in hospitalized children. Journal of Pediatric nursing 11(1):169-174.
17. Treston-Aurand, J., Olmsted, R., et al. 1997. Impact of dressing materials
on central venous catheter infection rates. Journal of Intravenous Nursing 20(4):201-206.
18. Vazquez, R., Jarrard, M. 1984. Care of the central venous catheterization
site: The use of a transparent polyurethane film. Journal of Parenteral and Enteral
Nutrition. 8(2):181-186.
19. Wheeler, W., Messner, R., et al. 1988. A comparison of transparent dressings
and gauze dressings for single, lumen, non tunneled central, parenteral nutrition
catheters. Nutritional Support Services. 8(9):27-28.
20. Wille, J., Albas, B., et al. 1993. A comparison of two transparent film-type
dressings in central venous therapy. Journal of Hospital Infection 23:113-121.
21. Young, G., Alexeyeff, M., et al. 1988. Catheter sepsis during parenteral
nutrition: the safety of long term opsite dressings. Journal of Parenteral and
Enteral Nutrition.12(4):365-369.
Studies excluded
1. Babycos, C., Barrocas, A., et al. 1990.
Reason - Not clear that patients are inpatients, setting not identified.
2. Callahan, J. Wesorick, B. 1987.
Reason - Healthy population of volunteers, CVC not used for any
purpose, CVC duration only 24 hours.
3. Dickerson, N. Horton, P. et al. 1989.
Reason - Commentary, insufficient data.
4. Haffejee, A. Moodley, J. et al. 1991.
Reason - n = 8.
5. Hoffmann, K. Weber, D. et al. 1992.
Reason - Meta-analysis.
6. Jarrard, M. Olson, C. et al. 1980.
Reason - Does not identify type of dressing.
7. Keenlyside, D. 1993.
Reason - Assesses ease of application, security of fixation, skin
condition, control group dressing not identified.
8. Lam, S., Scannell, R., et al. 1994.
Reason - Not evaluating dressings
9. Levin, A. Mason, J. et al. 1991.
Reason - Includes outpatients.
10. Lucas, H. Attard-Montalto, S. 1996.
Reason - Includes outpatients.
11. Lucas, J., Berger, A., et al. 1992.
Reason - Includes umbilical artery and arterial lines.
12. Petrosino, B. Becker, H. et al. 1988.
Reason - Includes outpatients.
13. Popovsky, M. Ilstrup, D. 1986.
Reason - Peripheral IV catheters.
14. Raad, J., Davis, S., et al. 1993.
Reason - Not evaluating dressings.
15. Richet, H., Nitemberg, G., et al. 1990.
Reason - Dressing identified only as 'Regular'.
16. Schwartz-Fulton, H. Colley, R. et al. 1981.
Reason - Assessing bacterial growth under dressing, not evaluating dressing
and dentified outcomes.
Unpublished studies that were not available
1. McKinley, S., Low, H., Mackenzie, A., Finfer, S., O'Connor, A., Green, S.
1997. Gauze dressings, antiseptic impregnated catheters and central venous catheter
infections.
2. Nikoletti, S., Gandossi, S., Coombs, G., Wilson, R. 1997. Comparison
of transparent polyurethane and hydrocolloid dressings for central venous catheters.
Key to Tables
| Study type |
comp = comparative eval = evaluation |
| Study allocation |
NI = not identified
R = random |
| Mean duration |
identified in days |
| Dressing type |
A = Alcohol B = Betadine
C = Chlorhexidine G = Gauze HPT = Highly Permeable
Transparent NOB = Nobecutane OP = Opsite T = Transparent
Tg = Tegaderm Tl = Telfa |
| Dressing change |
OD = once daily OW = once
week TW = twice week 3W = three times week |
| Site |
Sub = Subclavian Jug = Jugular |
| Infection |
CRS = Catheter Related Sepsis- positive
catheter tip culture, systemic signs and symptoms consistent with infection, fungemia
or bacteremia, fever or bacteremia or fungemia in the absence of an exit site
or tunnel infection, defervescence (clinical signs of infection prior to removal
of catheter) CRI = Catheter Related Infection - positive quantitative
or semiquantitative culture of the catheter |
LIST OF TABLES
Some Tables contain considerable data and may be slow
to load
Table 1: Characteristics of included studies
Table 2. & Figure 1: Weighting of included studies
Table 3 : Summary of All
Studies
Table 4 : Summary of transparent versus gauze dressings
Table 5 : Summary of transparent versus gauze with betadine
dressings
Table 6 : Summary of gauze dressings
Table 7 : Summary of transparent dressings and transparent
and other dressings
Table 8 : Summary of transparent, gauze and other combinations
of dressings
Table 9 : Summary of studies with any significant results
Table 10 : Summary of studies with dressing change
2nd daily (including MWF dressings)
Table 11 : Summary of studies where dressing frequency
is not identified
Table 12 : Summary of studies of transparent dressings
change of Once a Week
Table 13 : Summary of studies of transparent dressings
change less than OW
Table 14 : Summary of studies with gauze dressing change
of OD
Table 15 : Summary of studies with gauze dressing change
of 2nd daily
Table 16 : Summary of studies with gauze dressing change
of OW
REFERENCES
Babycos, R., Barrocas, A., Mancuso, J., Turner-Marse T. 1990. Collodion as
a safe, cost effective dressing for central venous catheters. Southern Medical
Journal 84; 11:1286-1288.
Callahan, J., Wesorick, B. 1987. Bacterial growth under a transparent dressing.
American Journal of Infection Control 15; 6:231-237.
Lucas, H., Attard-Montalto, S., 1996. Central line dressings: study of infection
rates. Paediatric Nursing Jul 8; 6:21-23.
Petrosino, B., Becker, H., Becky, C. 1988. Infection rates incentral venous
catheter dressings. ONF 15; 6:709-719.
Richet, H., Nitemberg, H., Andremont, A., et al. 1990. Prospective multicenter
study of vascular catheter related complications and risk factors for positive
central catheter cultures in intensive care unit patients. Journal of Clinical
Microbiology. Nov 28; 11:2520-2525.
Speechley, V.1986. Intravenous therapy; peripheral/central lines. Nursing:
the Journal of Clinical Practice, Education and Management Mar 3; 3:95-100.
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