Maximum expiratory pressure

Man WD, Kyroussis D, Fleming TA, et al. Cough gastric pressure and maximum expiratory mouth jnessure in humans. Am J Respir Crit Care Med 2003 168 714—717. 

The most common causes of failure to wean include chronic obstructive pulmonary disease (COPD) exacerbations, neuromuscular diseases, h) oxic respiratory failure, post surgical complications (2), and heart failure. Weaning from the tracheostomy must consider the balance of respiratory muscle function and work of breathing. The work of breathing is determined by ventilatory demand, compliance of the lungs and chest wall, airway resistance, and intrinsic positive end-expiratory pressure (PEEPi). Adequacy of ventilatory drive and neuromechanical output can be assessed from the respiratory rate, airway occlusion pressure at 100 milliseconds (Po.i), maximum inspiratory pressure (MIP), and maximum voluntary ventilation (MW). 

Figure 6 Relationship between muscle strength and mixed venous partial pressure of CO2 (PVCO2) in patients with respiratory muscle weakness. Respiratory muscle strength is the arithmetic sum of maximum static inspiratory and expiratory mouth pressures (P iax = + TEmax)- The open circles...

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