Nasal CPAP after coronary artery surgery

Area of Science:

• Cardiology
• Pulmonary Medicine
• Surgical Recovery

Background:

• Coronary artery bypass grafting (CABG) surgery, particularly when using the left internal mammary artery (LIMA), can impact pulmonary function.
• Pulmonary shunt fraction is a key indicator of lung perfusion and oxygenation, often affected post-cardiac surgery.

Purpose of the Study:

• To evaluate the effect of nasal continuous positive airway pressure (CPAP) on pulmonary shunt fraction in patients following CABG surgery using LIMA.
• To assess the impact of nasal CPAP on respiratory rate and patient-reported outcomes such as chest pain, mask comfort, and ease of breathing.

Main Methods:

• A randomized controlled trial comparing 14 patients receiving nasal CPAP for 1 hour post-CABG with a control group.
• Measurement of pulmonary shunt fraction before, during, and after CPAP application.
• Monitoring of cardiorespiratory variables including respiratory rate and assessment of patient comfort using visual analogue scales.

Main Results:

• Nasal CPAP significantly reduced the pulmonary shunt fraction compared to the control group (p = 0.016).
• A significant decrease in respiratory rate was observed during CPAP use (p = 0.025).
• Patients in the CPAP group reported significantly better ease of breathing scores.

Conclusions:

• Nasal CPAP is an effective intervention for improving pulmonary shunt fraction in the early postoperative period after CABG surgery with LIMA.
• Nasal CPAP enhances respiratory comfort without adversely affecting other cardiorespiratory parameters or patient-reported pain and mask comfort.