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Synchronization of radiograph film exposure with the inspiratory pause. Effect on the appearance of bedside chest radiographs in mechanically ventilated patients.

Abstract：

:The appearance of portable chest radiographs (CXRs) may be affected by changes in ventilation, particularly when patients are mechanically ventilated. Synchronization of the CXR with the ventilatory cycle should limit the influence of respiratory variation on the appearance of the CXR. This study evaluates the effect of synchronizing the CXR film exposure with ventilation on the appearance of the radiograph. Twenty-five patients who remained intubated postoperatively, were mechanically ventilated, and required a CXR were enrolled in this triple-blind, randomized prospective study. Each patient received one radiograph using conventional techniques and another using the interface. The sequence of the two films was randomized, and the two films were taken on the same patient within a few minutes of each other. Hence, each patient served as his own control and the position of the patient, source-film distance, intensity (Kvp), and duration of the exposure (mAs) were identical for the two films. Five board-certified radiologists were then asked to compare paired films for clarity of lines and tubes, definition of the pulmonary vasculature, visibility of the mediastinum, definition of the diaphragm, and degree of lung inflation. Radiologists were also asked to choose which films they preferred. A majority of board certified radiologists preferred CXRs taken with the interface in 21 of 25 patients (p < 0.0001). Furthermore, four of the five criteria evaluated were improved (p < 0.05) on synchronized CXRs. Synchronization of the bedside CXR with the end of inspiration ensures that they are always obtained at maximal inflation, which improves the appearance of a majority of radiographs by at least one of five criteria.

journal_name

Am J Respir Crit Care Med

journal_title

American journal of respiratory and critical care medicine

authors

Langevin PB,Hellein V,Harms SM,Tharp WK,Cheung-Seekit C,Lampotang S

doi

10.1164/ajrccm.160.6.9902060

keywords:

subject

Has Abstract

pub_date

1999-12-01 00:00:00

pages

2067-71

issue

eissn

1073-449X

issn

1535-4970

journal_volume

160

pub_type

临床试验,杂志文章,随机对照试验

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Synchronization of radiograph film exposure with the inspiratory pause. Effect on the appearance of bedside chest radiographs in mechanically ventilated patients.