Inspiratory muscle training for diaphragmatic dysfunction: A case series.

Area of Science:

• Pulmonary Rehabilitation
• Respiratory Physiology

Background:

• Inspiratory muscle training (IMT) is widely applied to enhance respiratory function across diverse medical conditions.
• Evidence supporting IMT efficacy in patients with diaphragmatic dysfunction remains limited.
• Unilateral diaphragmatic dysfunction (UDD) can occur post-cardiac surgery, impacting respiratory mechanics.

Observation:

• Seven patients (mean age 59.6 years) with post-cardiac surgery UDD participated in a cardiac rehabilitation program.
• A strength-based IMT protocol was administered over an average of 13 weeks.
• The study observed significant improvements in key respiratory parameters following IMT.

Findings:

• Patients experienced an average increase in maximum inspiratory pressure (MIP) of 48% (p=0.018).
• Peak inspiratory flow rate (PIFR) improved by an average of 45% (p=0.018).
• Forced expiratory volume in 1 second (FEV1) and forced vital capacity (FVC) showed average improvements of 15% (p=0.028 and p=0.018, respectively).

Implications:

• This case series provides preliminary evidence for the benefits of IMT in managing UDD.
• IMT may be a valuable component of cardiac rehabilitation for patients with diaphragmatic dysfunction.
• Further research is warranted to confirm these findings in larger cohorts.