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2020 ; 4
(4
): CD011621
Nephropedia Template TP
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English Wikipedia
Personal protective equipment for preventing highly infectious diseases due to
exposure to contaminated body fluids in healthcare staff
#MMPMID32293717
Verbeek JH
; Rajamaki B
; Ijaz S
; Sauni R
; Toomey E
; Blackwood B
; Tikka C
; Ruotsalainen JH
; Kilinc Balci FS
Cochrane Database Syst Rev
2020[Apr]; 4
(4
): CD011621
PMID32293717
show ga
BACKGROUND: In epidemics of highly infectious diseases, such as Ebola, severe
acute respiratory syndrome (SARS), or coronavirus (COVID-19), healthcare workers
(HCW) are at much greater risk of infection than the general population, due to
their contact with patients' contaminated body fluids. Personal protective
equipment (PPE) can reduce the risk by covering exposed body parts. It is unclear
which type of PPE protects best, what is the best way to put PPE on (i.e.
donning) or to remove PPE (i.e. doffing), and how to train HCWs to use PPE as
instructed. OBJECTIVES: To evaluate which type of full-body PPE and which method
of donning or doffing PPE have the least risk of contamination or infection for
HCW, and which training methods increase compliance with PPE protocols. SEARCH
METHODS: We searched CENTRAL, MEDLINE, Embase and CINAHL to 20 March 2020.
SELECTION CRITERIA: We included all controlled studies that evaluated the effect
of full-body PPE used by HCW exposed to highly infectious diseases, on the risk
of infection, contamination, or noncompliance with protocols. We also included
studies that compared the effect of various ways of donning or doffing PPE, and
the effects of training on the same outcomes. DATA COLLECTION AND ANALYSIS: Two
review authors independently selected studies, extracted data and assessed the
risk of bias in included trials. We conducted random-effects meta-analyses were
appropriate. MAIN RESULTS: Earlier versions of this review were published in 2016
and 2019. In this update, we included 24 studies with 2278 participants, of which
14 were randomised controlled trials (RCT), one was a quasi-RCT and nine had a
non-randomised design. Eight studies compared types of PPE. Six studies evaluated
adapted PPE. Eight studies compared donning and doffing processes and three
studies evaluated types of training. Eighteen studies used simulated exposure
with fluorescent markers or harmless microbes. In simulation studies, median
contamination rates were 25% for the intervention and 67% for the control groups.
Evidence for all outcomes is of very low certainty unless otherwise stated
because it is based on one or two studies, the indirectness of the evidence in
simulation studies and because of risk of bias. Types of PPE The use of a
powered, air-purifying respirator with coverall may protect against the risk of
contamination better than a N95 mask and gown (risk ratio (RR) 0.27, 95%
confidence interval (CI) 0.17 to 0.43) but was more difficult to don
(non-compliance: RR 7.5, 95% CI 1.81 to 31.1). In one RCT (59 participants),
people with a long gown had less contamination than those with a coverall, and
coveralls were more difficult to doff (low-certainty evidence). Gowns may protect
better against contamination than aprons (small patches: mean difference (MD)
-10.28, 95% CI -14.77 to -5.79). PPE made of more breathable material may lead to
a similar number of spots on the trunk (MD 1.60, 95% CI -0.15 to 3.35) compared
to more water-repellent material but may have greater user satisfaction (MD
-0.46, 95% CI -0.84 to -0.08, scale of 1 to 5). Modified PPE versus standard PPE
The following modifications to PPE design may lead to less contamination compared
to standard PPE: sealed gown and glove combination (RR 0.27, 95% CI 0.09 to
0.78), a better fitting gown around the neck, wrists and hands (RR 0.08, 95% CI
0.01 to 0.55), a better cover of the gown-wrist interface (RR 0.45, 95% CI 0.26
to 0.78, low-certainty evidence), added tabs to grab to facilitate doffing of
masks (RR 0.33, 95% CI 0.14 to 0.80) or gloves (RR 0.22, 95% CI 0.15 to 0.31).
Donning and doffing Using Centers for Disease Control and Prevention (CDC)
recommendations for doffing may lead to less contamination compared to no
guidance (small patches: MD -5.44, 95% CI -7.43 to -3.45). One-step removal of
gloves and gown may lead to less bacterial contamination (RR 0.20, 95% CI 0.05 to
0.77) but not to less fluorescent contamination (RR 0.98, 95% CI 0.75 to 1.28)
than separate removal. Double-gloving may lead to less viral or bacterial
contamination compared to single gloving (RR 0.34, 95% CI 0.17 to 0.66) but not
to less fluorescent contamination (RR 0.98, 95% CI 0.75 to 1.28). Additional
spoken instruction may lead to fewer errors in doffing (MD -0.9, 95% CI -1.4 to
-0.4) and to fewer contamination spots (MD -5, 95% CI -8.08 to -1.92). Extra
sanitation of gloves before doffing with quaternary ammonium or bleach may
decrease contamination, but not alcohol-based hand rub. Training The use of
additional computer simulation may lead to fewer errors in doffing (MD -1.2, 95%
CI -1.6 to -0.7). A video lecture on donning PPE may lead to better skills scores
(MD 30.70, 95% CI 20.14 to 41.26) than a traditional lecture. Face-to-face
instruction may reduce noncompliance with doffing guidance more (odds ratio 0.45,
95% CI 0.21 to 0.98) than providing folders or videos only. AUTHORS' CONCLUSIONS:
We found low- to very low-certainty evidence that covering more parts of the body
leads to better protection but usually comes at the cost of more difficult
donning or doffing and less user comfort, and may therefore even lead to more
contamination. More breathable types of PPE may lead to similar contamination but
may have greater user satisfaction. Modifications to PPE design, such as tabs to
grab, may decrease the risk of contamination. For donning and doffing procedures,
following CDC doffing guidance, a one-step glove and gown removal,
double-gloving, spoken instructions during doffing, and using glove disinfection
may reduce contamination and increase compliance. Face-to-face training in PPE
use may reduce errors more than folder-based training. We still need RCTs of
training with long-term follow-up. We need simulation studies with more
participants to find out which combinations of PPE and which doffing procedure
protects best. Consensus on simulation of exposure and assessment of outcome is
urgently needed. We also need more real-life evidence. Therefore, the use of PPE
of HCW exposed to highly infectious diseases should be registered and the HCW
should be prospectively followed for their risk of infection.
|*Betacoronavirus
[MESH]
|*Health Personnel
[MESH]
|*Personal Protective Equipment
[MESH]
|Body Fluids/virology
[MESH]
|COVID-19
[MESH]
|Computer Simulation
[MESH]
|Coronavirus Infections/*transmission
[MESH]
|Hemorrhagic Fever, Ebola/transmission
[MESH]
|Humans
[MESH]
|Infectious Disease Transmission, Patient-to-Professional/*prevention & control
[MESH]