Serial pulmonary function tests to diagnose COPD in chronic heart failure.

Area of Science:

• Cardiology
• Pulmonology
• Medical Diagnostics

Background:

• Chronic obstructive pulmonary disease (COPD) diagnosis in stable chronic heart failure (CHF) patients without congestion is unclear.
• Prevalence of COPD in stable CHF outpatients without pulmonary congestion needs evaluation.
• Study aimed to assess COPD prevalence using initial and confirmatory spirometry.

Purpose of the Study:

• To determine the prevalence of COPD in stable CHF outpatients without pulmonary congestion.
• To evaluate the necessity of confirmatory spirometry for COPD diagnosis in this cohort.

Main Methods:

• 187 outpatients with stable CHF (LVEF < 40%) and no pulmonary congestion underwent spirometry.
• COPD diagnosis followed Global Initiative for Chronic Obstructive Lung Disease guidelines.
• Confirmatory spirometry was performed three months after initiating tiotropium treatment for newly diagnosed COPD.

Main Results:

• Initial COPD prevalence was 32.6%, and after three months, it was 32.1%, showing no significant change.
• Only 4% of newly diagnosed COPD patients had non-reproducible obstruction at follow-up.
• Significant underdiagnosis (19%) and overdiagnosis (32%) of COPD were observed.

Conclusions:

• Spirometry in stable, euvolemic conditions is recommended for accurate COPD diagnosis in CHF patients.
• Confirmatory spirometry is generally unnecessary for COPD diagnosis in CHF patients under stable conditions.
• Using spirometry under stable conditions reduces COPD under- and overdiagnosis in CHF patients.