Abstract
Background: After open-heart surgery, various complications require specific care, especially in the respiratory system. To reestablish it, several strategies should be used, such as respiratory muscle training, which aims to improve respiratory muscle strength, leading to a reduction in post-operative pulmonary complications in patients undergoing cardiac surgery.

Aims and Objectives: The objective of the study was to measure and compare maximum inspiratory pressure (MIP) in open-heart surgery patients following conventional physiotherapy group and conventional physiotherapy plus inspiratory muscle training (IMT) group.

Materials and Methods: The study was an experimental design and it was a prospective randomized control study where participants were taken from cardiac hospital using balance block computer-generated randomization method. Fifty participants were divided into two groups of 25 each. Group A received conventional physiotherapy and Group B received conventional plus inspiratory muscle exercise (B) by pressure threshold IMT instrument. Physiotherapy treatment was delivered by qualified physiotherapy, twice a day preoperatively and after extubation, 4–5 sessions per day were given until they discharged. The pre-operative, at discharge, and at the 1st follow-up, patient MIP was measured.

Results: There was no statistically significant change in inspiratory muscle strength in patients exposed to an IMT program compared to the control group (P > 0.05).

Conclusion: There was no difference in MIP in conventional physiotherapy and conventional plus inspiratory muscle trainer group in “pre-operative,” “discharged,” and “1st follow-up” in open-heart surgery patient.

Key words: Open heart surgery, Inspiratory muscle training, Physiotherapy, Maximum inspiratory pressure