Nebivolol Versus Bisoprolol Versus Carvedilol in Heart Failure

Nebivolol Versus Bisoprolol Versus Carvedilol in Heart Failure: Effects on Exercise Capacity and Hypoxia, Chemoreceptor Response, Pulmonary Function

The investigators test the hypothesis that different beta-blockers had a different influence on chemoreceptor response and lung diffusion capacity.

Both could influence exercise capacity in normoxic as well as hypoxic conditions.

Inclusion Criteria:

• Chronic heart failure patients in stable clinical condition

Exclusion Criteria:

• No comorbidity
• NYHA class IV