Work of breathing imposed by different ventilators under hyperbaric conditions

Regulation of Breathing under Different Pulmonary Conditions

Effect of ventilation equipment on imposed work of breathing.

OBJECTIVE To determine the imposed work of different ventilation systems at 3 levels of pressure support. DESIGN Laboratory study. SETTING Teaching hospital respiratory laboratory. PARTICIPANTS Healthy, human volunteers. INTERVENTIONS Measurement of imposed work of breathing (WOB(i)) in six ventilators with alteration of ventilatory settings, humidification device, and triggering mechan...

The efficacy of postoperative incentive spirometry is influenced by the device-specific imposed work of breathing.

STUDY OBJECTIVES The study evaluated the impact of the additional imposed work of breathing (WBimp) generated by two different spirometers on postoperative incentive spirometry performance in patients at high risk and moderate risk for postoperative pulmonary complications (PPCs). Additionally, we investigated whether maximal inspiratory pressure (PImax) is an easy estimate of the WBimp imposed...

Does the tube-compensation function of two modern mechanical ventilators provide effective work of breathing relief?

OBJECTIVE An endotracheal tube (ETT) imposes work of breathing on mechanically ventilated patients. Using a bellows-in-a-box model lung, we compared the tube compensation (TC) performances of the Nellcor Puritan-Bennett 840 ventilator and of the Dräger Evita 4 ventilator. MEASUREMENTS AND RESULTS Each ventilator was connected to the model lung. The respiratory rate of the model lung was set a...

Imposed Work of Breathing for Flow Meters with In-Line versus Flow-Through Technique during Simulated Neonatal Breathing

BACKGROUND The ability to determine airflow during nasal CPAP (NCPAP) treatment without adding dead space or resistance would be useful when investigating the physiologic effects of different NCPAP systems on breathing. The aim of this study was to investigate the effect on pressure stability of different flow measuring devices at the in-line and flow-through position, using simulated neonatal ...