Latent left ventricular outflow tract obstruction induced by abnormal hypertrophic papillary muscle caused myocardial...

Area of Science:

• Cardiology
• Echocardiography
• Cardiovascular Imaging

Background:

• Left ventricular outflow tract (LVOT) obstruction is a known complication of hypertrophic cardiomyopathy.
• LVOT obstruction can also manifest in other conditions, including acute myocardial ischemia.
• Diagnosis may necessitate provocation testing, such as exercise stress echocardiography, in subtle cases.

Observation:

• This report details a patient presenting with exertional electrocardiogram (ECG) changes and ischemic symptoms.
• Coronary angiography revealed no significant arterial stenosis.
• The patient exhibited latent LVOT obstruction attributed to an abnormal hypertrophic papillary muscle.

Findings:

• The echocardiographic findings revealed latent LVOT obstruction.
• The obstruction was linked to an anomalous hypertrophic papillary muscle, distinct from typical ventricular hypertrophy.
• This highlights an unusual substrate for LVOT obstruction.

Implications:

• Accurate diagnosis of LVOT obstruction requires recognizing diverse echocardiographic substrates beyond ventricular hypertrophy.
• Prompt identification of conditions like hypertrophic papillary muscle is crucial for effective management.
• This case underscores the importance of comprehensive echocardiographic assessment in patients with suspected ischemia and LVOT obstruction.