Sinus bradycardia
Alerts and Notices
Synopsis
The SA node is the main pacemaker of the heart's conduction system. The vagus and sympathetic nerves innervate it. The SA nodal artery, which supplies the SA node, originates from the right coronary artery or the left circumflex artery.
Potential causes of sinus bradycardia include athletic conditioning, sick sinus syndrome, rate-lowering medications (eg, beta blockers, nondihydropyridine calcium channel blockers, ivabradine, amiodarone, digoxin, lithium), obstructive sleep apnea, enhanced vasovagal activity, hypothyroidism, acute myocardial infarction, elevated intracranial pressure, familial ion channelopathies, certain infectious causes (eg, Lyme disease, babesiosis, Chagas disease), infiltrative diseases, and collagen vascular diseases.
Codes
ICD10CM:R00.1 – Bradycardia, unspecified
SNOMEDCT:
49710005 – Sinus Bradycardia
Look For
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Diagnostic Pearls
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Differential Diagnosis & Pitfalls
- Hypoglycemia
- Hypothermia
- Complete heart block
- Second-degree heart block
- Junctional escape rhythm
- Ectopic atrial rhythm
Best Tests
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Management Pearls
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Therapy
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Drug Reaction Data
Below is a list of drugs with literature evidence indicating an adverse association with this diagnosis. The list is continually updated through ongoing research and new medication approvals. Click on Citations to sort by number of citations or click on Medication to sort the medications alphabetically.Subscription Required
References
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Last Reviewed:02/06/2020
Last Updated:02/06/2020
Last Updated:02/06/2020