Echocardiographic measures of acute haemodynamic response after cardiac resynchronization therapy predict long-term...

Area of Science:

• Cardiology
• Cardiac Electrophysiology
• Heart Failure Management

Background:

• Cardiac resynchronization therapy (CRT) improves heart failure outcomes.
• Acute hemodynamic improvement post-CRT indicates favorable contractile response.
• Limited data exists on predicting long-term outcomes based on acute response, especially across different cardiomyopathy substrates.

Purpose of the Study:

• To evaluate if acute hemodynamic response to CRT predicts long-term clinical outcomes.
• To investigate if this predictive value differs between ischemic and non-ischemic cardiomyopathy.

Main Methods:

• Fifty-three heart failure patients with CRT indications were studied.
• Acute hemodynamic response was assessed via echocardiography (LV dP/dt) within 24h of implantation.
• Patients were classified as high-responders (HR, DeltadP/dt > 25%) or poor-responders (PR, DeltadP/dt ≤ 25%).
• Long-term clinical response was defined by a composite endpoint of hospitalization and all-cause mortality at 12 months.

Main Results:

• No significant differences in baseline characteristics were observed between ischemic and non-ischemic groups.
• The HR group demonstrated significantly better long-term clinical outcomes compared to the PR group (P=0.004).
• This improved outcome in HR patients was consistent irrespective of the cardiomyopathy etiology.

Conclusions:

• Echocardiographic assessment of acute hemodynamic response to CRT is a valuable predictor of long-term clinical outcomes.
• This predictive capability holds true for both ischemic and non-ischemic cardiomyopathy patients receiving CRT.