Related Experiment Video
Updated: Jul 4, 2026

Evaluation of Capnography Sampling Line Compatibility and Accuracy when Used with a Portable Capnography Monitor
Published on: September 29, 2020
False-negative capnographic reading caused by a malfunctioning bag-valve-mask device resulting in a pneumomediastinum
1The University of Texas Health Science Center at Houston, Emergency Medicine and Pediatrics, 6431 Fannin Street, JJL-451 Houston, TX 77030, USA. Antonio.E.Muniz@uth.tmc.edu
Abstract:
Bag-valve-mask ventilation is generally a safe, and often a life-saving procedure for children who are unable to oxygenate or ventilate by themselves. A case is presented which describes a malfunctioning expiratory valve in a disposable manual bag-valve-mask device resulting in a pneumomediastinum in a child. This is a rare cause of a false-negative colorimetric end-tidal carbon dioxide (ETCO2) reading after endotracheal intubation. However, it is important to recognize so that further adverse outcomes can be prevented.
Related Concept Videos
Acute Respiratory Failure-III
Pneumothorax-I
Pneumothorax can be even further classified as spontaneous, traumatic, and tension pneumothorax.
Pneumothorax II: Pathophysiology
Atelectasis II: Pathophysiology
Acute Respiratory Failure-II
The underlying physiological abnormalities that contribute to hypoxemic respiratory failure include:
Errors occurring during blood pressure monitoring
Several factors...
