Inspiratory muscle strength as a determinant of functional capacity early after coronary artery bypass graft surgery.

 The objective of this study was to evaluate the effects of a 6-day postoperative in-hospital cardiopulmonary rehabilitation program on inspiratory muscle strength and its potential association with improved functional capacity after coronary artery bypass graft (CABG) surgery.  Twenty  men were randomised to receive either usual care or a six-day cardiopulmonary rehabilitation program following CABG. The rehabilitation included the use of expiratory positive airway pressure mask and bronchial hygiene techniques, coupled with progressive distance walking and calisthenics as well as cardiopulmonary training. Maximal inspiratory and expiratory pressure was measured at intervals,  six-minute walk test (6MWT) was performed 7 days after surgery, and maximal cardiopulmonary exercise testing was performed 30 days after surgery. All three measures were significantly better for the rehabilitation group. 

In summary a 6-day rehabilitation program attenuated the postoperative reduction in respiratory muscle strength and also improved the recovery of functional capacity after CABG.

Stein R, Maia CP, Silveira AD, Chiappa GR, Myers J, Ribeiro JP. Inspiratory muscle strength as a determinant of functional capacity early after coronary artery bypass graft surgery. Archives of Physical Medicine and Rehabilitation 2009 Oct;90(10):1685-91.