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Feasibility and effects of the semirecumbent position to prevent ventilator-associated pneumonia: a randomized study.

Abstract：

CONTEXT:Reducing aspiration of gastric contents by placing mechanically ventilated patients in a semirecumbent position has been associated with lower incidences of ventilator-associated pneumonia (VAP). The feasibility and efficacy of this intervention in a larger patient population, however, are unknown. OBJECTIVE:Assessment of the feasibility of the semirecumbent position for intensive care unit patients and its influence on development of VAP. DESIGN:In a prospective multicentered trial, critically ill patients undergoing mechanical ventilation were randomly assigned to the semirecumbent position, with a target backrest elevation of 45 degrees , or standard care (i.e., supine position) with a backrest elevation of 10 degrees . MAIN OUTCOME MEASURES:Backrest elevation was measured continuously during the first week of ventilation with a monitor-linked device. A deviation of position was defined as a change of the randomized position >5 degrees . Diagnosis of VAP was made by quantitative cultures of samples obtained by bronchoscopic techniques. RESULTS:One hundred nine patients were assigned to the supine group and 112 to the semirecumbent group. Baseline characteristics were comparable for both groups. Average elevations were 9.8 degrees and 16.1 degrees at day 1 and day 7, respectively, for the supine group and 28.1 degrees and 22.6 degrees at day 1 and day 7, respectively, for the semirecumbent group (p < .001). The target semirecumbent position of 45 degrees was not achieved for 85% of the study time, and these patients more frequently changed position than supine-positioned patients. VAP was diagnosed in eight patients (6.5%) in the supine group and in 13 (10.7%) in the semirecumbent group (NS), after a mean of 6 (range, 3-9) and 7 (range, 3-12) days, respectively. There were no differences in numbers of patients undergoing enteral feeding, receiving stress ulcer prophylaxis, or developing pressure sores or in mortality rates or duration of ventilation and intensive care unit stay between the groups. CONCLUSIONS:The targeted backrest elevation of 45 degrees for semirecumbent positioning was not reached in the conditions of the present randomized study. The achieved difference in treatment position (28 degrees vs. 10 degrees ) did not prevent the development of VAP.

journal_name

Crit Care Med

journal_title

Critical care medicine

authors

van Nieuwenhoven CA,Vandenbroucke-Grauls C,van Tiel FH,Joore HC,van Schijndel RJ,van der Tweel I,Ramsay G,Bonten MJ

doi

10.1097/01.ccm.0000198529.76602.5e

subject

Has Abstract

pub_date

2006-02-01 00:00:00

pages

396-402

issue

eissn

0090-3493

issn

1530-0293

pii

00003246-200602000-00017

journal_volume

pub_type

杂志文章,多中心研究,随机对照试验

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Feasibility and effects of the semirecumbent position to prevent ventilator-associated pneumonia: a randomized study.