Key result
Asymptomatic transient complete LBBB reveals mid-LAD myocardial bridge with ~30% stenosis.
Why the study?
Transient complete LBBB can occur in various conditions, and newly diagnosed complete LBBB with clinical manifestations is treated as ACS requiring hospitalization.
Case Report (n=1)
No
Identifying a myocardial bridge as a potential etiology for transient complete LBBB in young patients can optimize management and prevent unnecessary repeated hospitalizations for suspected acute coronary syndrome.
Transient LBBB may associate with myocardial bridging without obstructive CAD; leaves open any causal role in young adults.
Introduction. Transient complete left bundle branch block (LBBB) may occur against the background of various conditions, including coronary artery disease, cardiomyopathy of various origins, valvular diseases, heart rate abnormalities, acute pulmonary embolism, anesthesia, intrathoracic pressure changes, chest trauma, tumors, etc. Newly diagnosed complete LBBB in combination with the corresponding clinical manifestations is regarded as an acute coronary syndrome and requires immediate hospitalization. Results. A case of asymptomatic transient complete LBBB in a 36-yearold man without hemodynamically significant coronary atherosclerosis, with a myocardial bridge in the middle segment of left anterior descending artery with stenosis of 30%. Conclusion. Taking into account the paraclinical data, we studied the probability of transient complete LBBB against the background of left anterior descending artery myocardial bridging, as well as the probability of tachycardia-induced transient LBBB.
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Novokhatskaya et al. (2025) conducted a case report in Transient complete left bundle branch block and myocardial bridging (n=1). Myocardial bridge in the mid-left anterior descending artery was evaluated. A 36-year-old man with asymptomatic transient complete left bundle branch block was found to have a mid-LAD myocardial bridge with 30% stenosis and no significant coronary atherosclerosis.
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