A PVC may be perceived as a skipped beat or felt as palpitations in the chest. In a normal heartbeat, the ventricles contract after the atria have helped to fill them by contracting; in this way the ventricles can pump a maximized amount of blood both to the lungs and to the rest of the body.
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Respiratory muscle strength can be assessed by measuring the maximal inspiratory pressure (MIP or PImax), and the maximal expiratory pressure (MEP or PEmax). The MIP reflects the strength of the diaphragm and other inspiratory muscles, while the MEP reflects the strength of the abdominal muscles and other expiratory muscles. An alternative or additional test of inspiratory muscle strength is maximal sniff nasal inspiratory pressure (SNIP). Common indications for measurement of the MIP, SNIP, and MEP include: âRespiratory muscle weakness is suspected, such as a patient with unexplained dyspnea, a weak cough, or known neuromuscular disease.