[Wall motion abnormalities and hemodynamic parameters in patients with left bundle branch block during exercise...

Area of Science:

• Cardiology
• Diagnostic Imaging
• Exercise Physiology

Background:

• Left bundle branch block (LBBB) can complicate the assessment of cardiac function during stress.
• Exercise stress echocardiography (EEcho) is a non-invasive method to evaluate heart response to stress.
• Understanding contractility and hemodynamics in LBBB patients during EEcho is crucial for diagnosis.

Purpose of the Study:

• To investigate the dynamics of local contractility and hemodynamic parameters during EEcho in patients with LBBB.
• To assess the diagnostic potential of EEcho for coronary atherosclerosis in LBBB patients.

Main Methods:

• Bicycle exercise stress echocardiography performed on 23 patients with LBBB.
• Patients divided into groups based on ischemic heart disease status and EEcho response.
• Analysis of ejection fraction (EF), left ventricular end-diastolic volume (LVEDV), and local contractility.

Main Results:

• Patients without ischemic heart disease showed improved EF and exercise tolerance.
• Patients with prior myocardial infarction exhibited varying responses, with some showing worsened contractility.
• EEcho demonstrated a positive correlation with coronary artery findings, identifying significant lesions in most patients with known disease.

Conclusions:

• EEcho is a valuable tool for assessing coronary atherosclerosis in patients with LBBB.
• The study recommends EEcho as a first-line diagnostic method for this patient population.
• EEcho provides insights into cardiac contractility and hemodynamics under stress in LBBB.