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Meta-Analysis
. 2018 Sep 17;9(9):CD012779.
doi: 10.1002/14651858.CD012779.pub2.

Prophylactic platelet transfusions prior to surgery for people with a low platelet count

Lise J Estcourt  1 , Reem Malouf, Carolyn Doree, Marialena Trivella, Sally Hopewell, Janet Birchall
Affiliations
Meta-Analysis

Prophylactic platelet transfusions prior to surgery for people with a low platelet count

Lise J Estcourt et al. Cochrane Database Syst Rev. .

Abstract

Background: People with thrombocytopenia often require a surgical procedure. A low platelet count is a relative contraindication to surgery due to the risk of bleeding. Platelet transfusions are used in clinical practice to prevent and treat bleeding in people with thrombocytopenia. Current practice in many countries is to correct thrombocytopenia with platelet transfusions prior to surgery. Alternatives to platelet transfusion are also used prior surgery.

Objectives: To determine the clinical effectiveness and safety of prophylactic platelet transfusions prior to surgery for people with a low platelet count.

Search methods: We searched the following major data bases: Cochrane Central Register of Controlled Trials (CENTRAL; 2017, Issue 2), PubMed (e-publications only), Ovid MEDLINE, Ovid Embase, the Transfusion Evidence Library and ongoing trial databases to 11 December 2017.

Selection criteria: We included all randomised controlled trials (RCTs), as well as non-RCTs and controlled before-and-after studies (CBAs), that met Cochrane EPOC (Effective Practice and Organisation of Care) criteria, that involved the transfusion of platelets prior to surgery (any dose, at any time, single or multiple) in people with low platelet counts. We excluded studies on people with a low platelet count who were actively bleeding.

Data collection and analysis: We used standard methodological procedures expected by Cochrane for data collection. We were only able to combine data for two outcomes and we presented the rest of the findings in a narrative form.

Main results: We identified five RCTs, all conducted in adults; there were no eligible non-randomised studies. Three completed trials enrolled 180 adults and two ongoing trials aim to include 627 participants. The completed trials were conducted between 2005 and 2009. The two ongoing trials are scheduled to complete recruitment by October 2019. One trial compared prophylactic platelet transfusions to no transfusion in people with thrombocytopenia in an intensive care unit (ICU). Two small trials, 108 participants, compared prophylactic platelet transfusions to other alternative treatments in people with liver disease. One trial compared desmopressin to fresh frozen plasma or one unit of platelet transfusion or both prior to surgery. The second trial compared platelet transfusion prior to surgery with two types of thrombopoietin mimetics: romiplostim and eltrombopag. None of the included trials were free from methodological bias. No included trials compared different platelet count thresholds for administering a prophylactic platelet transfusion prior to surgery. None of the included trials reported on all the review outcomes and the overall quality per reported outcome was very low.None of the three completed trials reported: all-cause mortality at 90 days post surgery; mortality secondary to bleeding, thromboembolism or infection; number of red cell or platelet transfusions per participant; length of hospital stay; or quality of life.None of the trials included children or people who needed major surgery or emergency surgical procedures.Platelet transfusion versus no platelet transfusion (1 trial, 72 participants)We were very uncertain whether giving a platelet transfusion prior to surgery had any effect on all-cause mortality within 30 days (1 trial, 72 participants; risk ratio (RR) 0.78, 95% confidence interval (CI) 0.41 to 1.45; very-low quality evidence). We were very uncertain whether giving a platelet transfusion prior to surgery had any effect on the risk of major (1 trial, 64 participants; RR 1.60, 95% CI 0.29 to 8.92; very low-quality evidence), or minor bleeding (1 trial, 64 participants; RR 1.29, 95% CI 0.90 to 1.85; very-low quality evidence). No serious adverse events occurred in either study arm (1 trial, 72 participants, very low-quality evidence).Platelet transfusion versus alternative to platelet transfusion (2 trials, 108 participants)We were very uncertain whether giving a platelet transfusion prior to surgery compared to an alternative has any effect on the risk of major (2 trials, 108 participants; no events; very low-quality evidence), or minor bleeding (desmopressin: 1 trial, 36 participants; RR 0.89, 95% CI 0.06 to 13.23; very-low quality evidence: thrombopoietin mimetics: 1 trial, 65 participants; no events; very-low quality evidence). We were very uncertain whether there was a difference in transfusion-related adverse effects between the platelet transfused group and the alternative treatment group (desmopressin: 1 trial, 36 participants; RR 2.70, 95% CI 0.12 to 62.17; very-low quality evidence).

Authors' conclusions: Findings of this review were based on three small trials involving minor surgery in adults with thrombocytopenia. We found insufficient evidence to recommend the administration of preprocedure prophylactic platelet transfusions in this situation with a lack of evidence that transfusion resulted in a reduction in postoperative bleeding or all-cause mortality. The small number of trials meeting the inclusion criteria and the limitation in reported outcomes across the trials precluded meta-analysis for most outcomes. Further adequately powered trials, in people of all ages, of prophylactic platelet transfusions compared with no transfusion, other alternative treatments, and considering different platelet thresholds prior to planned and emergency surgical procedures are required. Future trials should include major surgery and report on bleeding, adverse effects, mortality (as a long-term outcome) after surgery, duration of hospital stay and quality of life measures.

PubMed Disclaimer

Conflict of interest statement

LE: partly funded by the National Institute of Health Research (NIHR) Cochrane Programme Grant ‐ Safe and Appropriate Use of Blood Components.

RM: partly funded by the National Institute of Health Research (NIHR) Cochrane Programme Grant‐ Safe and Appropriate Use of Blood Components.

CD: none known.

MT: none known.

SH: none known.

JB: none known.

Figures

1
1
Study flow diagram.
2
2
Risk of bias summary: review authors' judgements about each risk of bias item for each included study.
1.1
1.1. Analysis
Comparison 1 Prophylactic platelet transfusion prior to surgery versus no prophylactic platelet transfusion prior to surgery, Outcome 1 All‐cause mortality within 30 days of surgery.
1.2
1.2. Analysis
Comparison 1 Prophylactic platelet transfusion prior to surgery versus no prophylactic platelet transfusion prior to surgery, Outcome 2 Number of participants with major procedure‐related bleeding within 7 days of surgery.
1.3
1.3. Analysis
Comparison 1 Prophylactic platelet transfusion prior to surgery versus no prophylactic platelet transfusion prior to surgery, Outcome 3 Number of participants with minor procedure‐related bleeding within 7 days of surgery.
1.4
1.4. Analysis
Comparison 1 Prophylactic platelet transfusion prior to surgery versus no prophylactic platelet transfusion prior to surgery, Outcome 4 Proportion of participants requiring additional interventions to stop bleeding within 7 days of surgery.
2.1
2.1. Analysis
Comparison 2 Prophylactic platelet transfusion prior to surgery versus alternative treatments, Outcome 1 Number of participants with minor procedure‐related bleeding within 7 days of surgery.
2.2
2.2. Analysis
Comparison 2 Prophylactic platelet transfusion prior to surgery versus alternative treatments, Outcome 2 Proportion of participants requiring additional interventions to stop bleeding within 7 days of surgery.
2.3
2.3. Analysis
Comparison 2 Prophylactic platelet transfusion prior to surgery versus alternative treatments, Outcome 3 Serious adverse events (transfusion related adverse effects within 24 hours of the transfusion).
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