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[Myocardial bridging and sudden death]
C Grigoriu1, V Astărăstoae, B Grigoriu
1Disciplina de Medicină Legală, Facultatea de Medicină, Universitatea de Medicină şi Farmacie Gr.T. Popa Iaşi.
Insights
Myocardial bridging (MB) is common but rarely causes ischemia. Significant clinical impact requires thick MB with substantial coronary obstruction, often linked to ventricular hypertrophy or tachycardia.
Area of Science:
- Cardiology
- Pathophysiology
- Medical Research
Background:
- Myocardial bridging (MB) is a congenital anomaly known for over 200 years.
- Its role in myocardial ischemia genesis is recently studied, with limited understanding of incidence, survival, and pathophysiology.
- Existing literature is biased due to retrospective, small, and selected study populations.
Purpose of the Study:
- To review the current understanding of myocardial bridging.
- To clarify the conditions under which MB may cause significant clinical effects.
- To establish criteria for attributing sudden death to MB.
Main Methods:
- Literature review of studies on myocardial bridging.
- Analysis of factors contributing to MB-induced ischemia.
- Evaluation of diagnostic criteria for MB-related sudden death.
Main Results:
- Most MB cases are frequent and seldom cause ischemia.
- Significant clinical effects are associated with thick MB, >75% systolic obstruction, ventricular hypertrophy, and/or tachycardia.
- Attributing sudden death to MB requires more than necropsy findings, suggesting clinical/ECG ischemia or histological evidence.
Conclusions:
- Myocardial bridging is generally benign.
- Clinical significance of MB is linked to specific anatomical and physiological factors.
- Further evidence is needed to confirm MB as a cause of sudden death.
Abstract:
Myocardial bridging (MB) has been described more than 200 years ago. However it's implications on the genesis of myocardial ischaemia were not studied until recently. Little is known about the real incidence, survival in people with this entity and pathophysiology. Data found in the literature are prone to bias since all studies published are retrospective and the populations studied are limited and very selectioned. Most authors agree that most MB is rather frequent and seldom generates ischaemia. A significant clinical effect of myocardial bridging implies a thick MB with at least 75% coronary systolic obstruction associated with ventricular hypertrophy and/or rapid tachycardia. In the peculiar case of sudden death, we think that to consider MB as a cause of this sudden death we need more than a simple necroptic finding of a MB. A history of clinical and/or electrocardiographic confirmed ischaemia or the presence of histological abnormalities suggesting myocardial ischaemia can be helpful.