See Also
1. Bradycardia
2. Unstable Bradycardia
Pathophysiology
1. Normal pattern in healthy adults and athletes
  1. Baseline Bradycardia suggests physical conditioning
2. Other causes of Sinus Bradycardia
  1. See Drug Induced Bradycardia
  2. Hypothermia
  3. Severe infection
  4. Jaundice
  5. Carotid Sinus Hypersensitivity
    1. Tight shirt collar
  6. Excessive parasympathetic stimulation
    1. Acute inferior wall Myocardial Infarction
  7. Decreased sympathetic stimulation (medications)
Diagnostics: EKG Findings
1. Regular rhythm with rate at <50 to 60 beats per minute
2. Normal and consistent P-wave morphology
3. Normal PR-Interval duration
Differential Diagnosis
1. See Bradycardia
Management
1. Usually physiologic and requires no treatment
2. If hemodynamically unstable, see Unstable Bradycardia
References
1. Cardiopulmonary Resuscitation Guidelines

Sinus bradycardia (C0085610)
Definition (NCI)	A heart rate of less than 60 beats per minute, with its origin in the sinus node. (NCI)
Definition (NCI)	A disorder characterized by a dysrhythmia with a heart rate less than 60 beats per minute that originates in the sinus node.
Definition (NCI)	A heart rate of less than 60 beats per minute, with its origin in the sinus node.
Concepts	Pathologic Function (T046)
ICD10	R00.1
SnomedCT	309746001, 207040007, 49710005
English	BRADYCARDIA SINUS, SINUS BRADYCARDIA, [D]Sinus bradycardia (context-dependent category), [D]Sinus bradycardia, Sinus bradycardia, sinus bradycardia (diagnosis), sinus bradycardia, [D]Sinus bradycardia (situation), Bradycardia sinus, bradycardia sinus, Sinus bradycardia (disorder), bradycardia; sinus, sinus; bradycardia, Sinus Bradycardia
Italian	Bradicardia sinusale
German	Sinusbradycardie, SINUSBRADYKARDIE, Sinusbradykardie
Japanese	洞性徐脈, ﾄﾞｳｾｲｼﾞｮﾐｬｸ
Spanish	[D]bradicardia sinusal (categoría dependiente del contexto), [D]Sinus bradycardia, BRADICARDIA SINUSAL, [D]bradicardia sinusal, [D]bradicardia sinusal (situación), bradicardia sinusal (trastorno), bradicardia sinusal, Bradicardia sinusal
Portuguese	BRADICARDIA SINUSAL, Bradicardia sinusal
French	BRADYCARDIE SINUSALE, Bradycardie sinusale
Czech	Sinusová bradykardie
Hungarian	Sinus bradycardia
Dutch	bradycardie; sinus, sinus; bradycardie, sinusbradycardie
Sources	Derived from the NIH UMLS (Unified Medical Language System)

Family Practice Notebook

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This page was written by Scott Moses, MD, last revised on 9/10/2011 and last published on 2/5/2012.

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