Myocardial bridge

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Myocardial bridge
Synonyms
Pronounce	N/A
Specialty	N/A
Symptoms	Often asymptomatic, angina, myocardial ischemia
Complications	Myocardial infarction, arrhythmia
Onset
Duration
Types
Causes	Congenital
Risks
Diagnosis	Coronary angiography, intravascular ultrasound
Differential diagnosis
Prevention
Treatment	Beta blockers, calcium channel blockers, surgery
Medication
Prognosis	Generally good if asymptomatic
Frequency	5-40% in the general population
Deaths

A congenital heart anomaly involving the coronary arteries

A myocardial bridge is a congenital anomaly of the coronary arteries where a segment of a coronary artery tunnels through the myocardium, the muscular wall of the heart, instead of resting on its surface. This condition is most commonly found in the left anterior descending artery (LAD), but can occur in other coronary arteries as well.

Anatomy and Physiology

In a typical heart, the coronary arteries lie on the surface of the heart, supplying oxygen-rich blood to the heart muscle. In the case of a myocardial bridge, a portion of the artery dips into the myocardium and is "bridged" by heart muscle. During systole, when the heart muscle contracts, the tunneled segment of the artery is compressed, which can potentially reduce blood flow.

Clinical Significance

While many individuals with a myocardial bridge are asymptomatic, some may experience symptoms such as angina, myocardial ischemia, or even myocardial infarction. The compression of the artery during systole can lead to decreased blood flow, particularly during periods of increased heart rate or demand.

Symptoms

Symptoms associated with myocardial bridges can include:

• Chest pain or angina
• Palpitations
• Dyspnea (shortness of breath)
• Syncope (fainting)

Diagnosis

Myocardial bridges are often diagnosed using imaging techniques such as:

• Coronary angiography
• Intravascular ultrasound (IVUS)
• Computed tomography angiography (CTA)

Treatment

Treatment for myocardial bridges depends on the severity of symptoms. Options include:

• Beta-blockers or calcium channel blockers to reduce heart rate and myocardial contractility
• Surgical intervention, such as myotomy, in severe cases
• Lifestyle modifications to reduce cardiac stress

See also

• Coronary artery disease
• Angina pectoris
• Myocardial infarction
• Cardiac anatomy