Reversible heart block following nonpenetrating chest trauma
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Blunt chest trauma can cause various heart injuries, including rare cases of high-grade atrioventricular block. This case highlights the importance of recognizing cardiac dysrhythmias after chest trauma.
Area of Science:
- Cardiology
- Trauma Medicine
- Cardiac Electrophysiology
Background:
- Blunt chest trauma can injure heart structures, leading to mechanical or electrical dysfunction.
- Cardiac dysrhythmias post-trauma are poorly understood clinically, though animal studies show impulse generation/transmission disturbances.
Observation:
- A patient presented with third-degree heart block after sustaining blunt chest injury.
- High-grade atrioventricular (A-V) block is rarely recognized clinically after nonpenetrating cardiac trauma.
Findings:
- Blunt chest trauma can lead to diverse cardiac injuries affecting all heart structures.
- Electrical disturbances, including complete heart block, can occur immediately after impact.
Implications:
- This case underscores the potential for severe cardiac electrical complications following blunt chest trauma.
- Further clinical investigation is needed to understand the incidence and presentation of cardiac dysrhythmias after trauma.
Abstract:
Blunt chest trauma, if sustained selectively to the midchest or precordium, can result in a variety of cardiac injuries (3, 7). These lesions may involve separately or together all structures of the heart, including pericardium, myocardium, valves, and coronary arteries. Depending on the extent of trauma, such injuries can cause varying amounts of mechanical or electrical dysfunction. The incidence and nature of cardiac dysrhythmias following trauma are largely unknown clinically, but have been extensively documented in several animal studies (2, 4, 5). Disturbances in both impulse generation and transmission were noted, usually beginning immediately after impact with the development of complete heart block and progressing quickly through several other electrical patterns to either sinus rhythm or ventricular fibrillation. High-grade atrioventricular (A-V) block has rarely been recognized clinically in association with nonpenetrating heart trauma (1), perhaps because of its rapid replacement by other dysrhythmias. It was, therefore, of interest when a patient presented to this institution in third-degree heart block following a blunt chest injury. Specifics of her illness are discussed.