Related Experiment Video
Updated: Nov 28, 2025

Normothermic Negative Pressure Ventilation Ex Situ Lung Perfusion: Evaluation of Lung Function and Metabolism
Published on: February 14, 2022
Modified setting of negative pressure in children with mild respiratory disease
Shingo Ishimori1,2, Shizuka Nagase1, Atsuko Kanagawa1
1Department of Pediatrics, Kakogawa Central City Hospital, Kakogawa, Japan.
Insights
Continuous negative extra-thoracic pressure (CNEP) effectively reduced respiratory symptoms in hospitalized children. This modified CNEP approach was well-tolerated and safe, avoiding the need for intubation in most cases.
Area of Science:
- Pediatric Pulmonology
- Respiratory Medicine
Background:
- Continuous negative extra-thoracic pressure (CNEP) is known to prevent severe respiratory infections requiring endotracheal intubation in children with apnea.
- Limited data exists on CNEP's efficacy and safety in children with mild acute respiratory disease, particularly concerning clinical respiratory symptoms.
Purpose of the Study:
- To evaluate the safety and effectiveness of a modified CNEP setting in hospitalized children presenting with chest-wall retraction or nasal alar breathing.
- To assess CNEP's impact on clinical respiratory symptoms in this pediatric population without immediate need for intubation.
Main Methods:
- A prospective, observational study was conducted from July 2014 to July 2017 at a single center.
- A modified CNEP protocol involved 4 hours of treatment: 3 consecutive hours of CNEP followed by 1 hour of rest.
- Nineteen hospitalized children meeting specific respiratory symptom criteria were included, with no sedative drugs administered.
Main Results:
- The study included 19 children (median age 0.9 years) treated with CNEP for a median of 6 days.
- A significant decrease in chest-wall retraction or nasal breathing was observed within 24 hours of CNEP initiation (68% vs 100%, P=0.02).
- No patients required transfer for intubation; no adverse events such as upper airway obstruction, skin injury, or hypothermia were reported.
Conclusions:
- Modified CNEP management is a safe and tolerable treatment option for hospitalized children with specific respiratory symptoms.
- This approach can be successfully implemented without significant adverse events, potentially avoiding endotracheal intubation.
Background:
Continuous negative extra-thoracic pressure (CNEP) can prevent children with apnea developing severe respiratory infection with endotracheal intubation. Little is known about children with mild acute respiratory disease, especially with a focus on clinical respiratory symptoms.
Methods:
We conducted a prospective, observational study between July 2014 and July 2017 to evaluate the safety of a modified setting of CNEP in hospitalized children with symptoms of chest-wall retraction or nasal alar breathing without the requirement for immediate intubation therapy in a single center. A modified setting of CNEP was defined as 4 h of treatment comprising 3 consecutive hours of CNEP followed by 1 h of rest.
Results:
We studied 19 hospitalized children with retraction or nasal breathing but no possible state of endotracheal intubation. The median age at admission was 0.9 years and the duration of CNEP was 6 days. No sedative drugs were used. The percentage of children with retraction or nasal breathing after 24 h from initiation of CNEP was significantly decreased compared with that just before CNEP (68% vs 100%, P = 0.02). Logistic regression showed no statistical evidence of contributing factors for pulmonary symptoms. No patients were transferred to receive intubation, but one boy reinitiated respiratory support within 6 months after discharge. No children had adverse events of upper airway obstruction, skin injury, interfering with access, hypothermia, discomfort from fitting a cuirass, and neck excoriation.
Conclusions:
Our results suggest that a modified setting of CNEP management can be tolerated and continued without concern of adverse events.
More Related Videos
Related Concept Videos
Mechanical Ventilation I: Indication and Settings
Mechanical Ventilation III: Noninvasive Ventilation
Noninvasive Positive-Pressure Ventilation...
Pulmonary Cycle: Exhalation
Mechanical Ventilation II: Invasive Ventilation
Negative-Pressure Ventilators
Negative-pressure ventilators create a vacuum around the chest or body to draw air into the lungs, simulating breathing. This method does not require an...
Acute Respiratory Failure-V
Ensure that patients are monitored continuously for their response to therapy, including changes in...
Ventilatory Modes
There are three ventilatory modes: full support, partial support, and spontaneous. These are described below.
Full Support Modes
Full support modes include controlled mechanical ventilation, continuous mandatory...

