Pulmonary hemodynamic profile in chronic obstructive pulmonary disease

Area of Science:

• Cardiology
• Pulmonology
• Respiratory Medicine

Background:

• Limited data exist on pulmonary hypertension (PH) prevalence across the spectrum of chronic obstructive pulmonary disease (COPD).
• This study assessed PH prevalence and hemodynamic characteristics in COPD patients at rest and during exercise.

Purpose of the Study:

• To determine the prevalence of PH in a cohort of COPD patients.
• To characterize the hemodynamic profiles of PH in COPD patients at rest and during exercise.
• To investigate the association between PH and airflow limitation severity and arterial hypoxemia.

Main Methods:

• Retrospective analysis of COPD patients undergoing right-heart catheterization.
• PH defined as mean pulmonary artery pressure (mPAP) ≥25 mmHg and pulmonary capillary wedge pressure <15 mmHg.
• Exercise-induced PH (EIPH) defined by ΔmPAP/Δcardiac output ratio >3.

Main Results:

• PH was present in 18% of COPD patients, with higher prevalence in GOLD 3 (25%) and GOLD 4 (22%) stages.
• Severe PH (mPAP ≥35 mmHg) occurred in 2.8% of patients.
• Arterial partial oxygen pressure was strongly associated with PH (r=-0.29, P<0.001).
• EIPH was observed in 71% of patients, present in all GOLD 4 patients.
• Patients with PH had a lower cardiac index during exercise compared to those without PH (P=0.001).

Conclusions:

• PH prevalence is similar in severe and very-severe COPD and linked to arterial hypoxemia.
• Exercise-induced PH is highly prevalent, even in moderate COPD, and may impair exercise capacity.
• These findings highlight the importance of screening for PH in COPD patients, especially those with hypoxemia.