Overview
Sinus arrest is the temporary interruption of sinoatrial node automaticity, that may occur due to intrinsic or extrinsic factors affecting the sinoatrial node.
Diagnosis
ECG Findings
- A pause of at least three seconds, without P waves or QRS complexes
- An escape rhythm may be present
Pathogenesis
Causes of Sinus Arrest
- Idiopathic degeneration
- Myocardial infarction
- Infiltrative disease - sarcoidosis, amyloidosis, haemochromatosis
- Connective tissue disease - SLE, scleroderma, RA
- Cardiac surgery - valvular surgery, correction of congenital heart disease
- Infections - Lyme disease, endocarditis
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