Methods of intermittent positive pressure breathing

Area of Science:

• Pulmonary Physiology
• Respiratory Therapy

Background:

• Inspiratory capacity (IC) is a key measure of pulmonary expansion.
• The method of administering inspiratory positive-pressure breathing (IPPB) may influence treatment outcomes.

Purpose of the Study:

• To evaluate the effect of different inspiratory positive-pressure breathing (IPPB) maneuvers on inspiratory capacity (IC).
• To determine the optimal IPPB method for maximizing pulmonary expansion.

Main Methods:

• Sixty patients underwent four distinct respiratory maneuvers.
• Maneuvers included coached unassisted inspiration and three IPPB variations with differing pressure settings and patient coaching.
• Inspiratory capacity was measured for each maneuver.

Main Results:

• Coached active inspiration with therapist-adjusted IPPB (Method 4) resulted in the highest mean IC (2.27 L).
• Passive IPPB (Method 2) showed a lower IC (1.13 L) compared to coached unassisted inspiration (1.29 L).
• Coached active IPPB (Method 3) yielded a significantly higher IC (1.77 L) than unassisted or passive methods.
• Method 4 utilized an average peak pressure of 30 cm H2O without reported adverse effects.

Conclusions:

• The method of administering IPPB profoundly impacts pulmonary expansion.
• Coached active inspiration combined with therapist-adjusted IPPB pressure (Method 4) is recommended for clinical use to maximize inspiratory capacity.
• Future research on IPPB therapy must carefully control and document administration methods and achieved volumes.