An inspiratory<unk>  is a valve used in cardiopulmonary resuscitation (CPR) to decrease intrathoracic pressure and improve venous return to the heart. The valve is a part of a mask or other breathing<unk>  such as an endotracheal tube, and may open at high or low pressures (called "cracking pressures.")<unk> s are still in the early phases of clinical use, but preliminary investigational studies have suggested a potential benefit in achieving return of spontaneous circulation (ROSC) and early improvement after cardiopulmonary arrest in humans. More recently, the Resuscitation Outcomes Consortium (ROC) Prehospital Resuscitation<unk>  Valve and Early Versus Delayed Analysis (PRIMED) study (n=8718) failed to demonstrate improved outcomes with the use of an<unk>  <unk>  as an adjunct to conventional CPR when compared with use of a sham<unk> . Quality of cardiopulmonary resuscitation (CPR) was a deciding factor, with<unk>  increasing survival when in combination with "acceptable" CPR quality, but decreasing survival when CPR quality was not "acceptable". This negative high-quality study prompted a Class III: No Benefit recommendation regarding routine use of the<unk> .<unk>  use may only be beneficial if the cardiac arrest is witnessed and the response time is rapid.
Impedance threshold device
Fluid deprivation test
Optoelectronic plethysmography
Respiratory disturbance index
Air displacement plethysmography
Plethysmograph
Structured light plethysmography
Respiratory pressure meter