Echocardiographic Brockenbrough-Braunwald-Morrow sign

Area of Science:

• Cardiology
• Cardiac Physiology
• Medical Imaging

Background:

• Hypertrophic obstructive cardiomyopathy (HOCM) is characterized by left ventricular outflow tract (LVOT) obstruction.
• The Brockenbrough-Braunwald-Morrow sign describes a paradoxical fall in pulse pressure after a premature beat in HOCM.
• Understanding the mechanisms of this sign is crucial for patient management.

Observation:

• A case of intermittent LVOT obstruction and secondary mitral regurgitation was identified.
• This obstruction was triggered by post-extrasystolic potentiation following a premature atrial beat.
• Echocardiography was utilized to visualize the cardiac dynamics.

Findings:

• The study demonstrates the echocardiographic evidence of the Brockenbrough-Braunwald-Morrow sign.
• Post-extrasystolic potentiation was confirmed as the mechanism leading to LVOT obstruction and mitral regurgitation.
• The interplay between premature beats and cardiac mechanics was elucidated.

Implications:

• This case highlights the importance of recognizing the Brockenbrough-Braunwald-Morrow sign in diagnosing HOCM.
• Echocardiography provides valuable insights into the dynamic nature of LVOT obstruction.
• Further research into post-extrasystolic potentiation may refine therapeutic strategies for HOCM.