Bradycardia causes

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: M.Umer Tariq [2]

Overview

Pathologic bradycardias are caused by disorders of impulse generation (impaired automaticity at SA node), impulse conduction (heart block) or escape pacemakers and rhythms. Bradycardia can be underlain by several causes, which are best divided into cardiac and non-cardiac causes or based on the location of the abnormality. Non-cardiac causes are usually secondary, and can involve recreational drug use; endocrine disorders (hypothyroid); electrolyte imbalance (hyperkalemia); autonomic reflexes; situational factors (prolonged bed rest); infections lyme disease; medications; and autoimmunity disorders. Cardiac causes include acute or chronic ischemic heart disease, vascular heart disease, valvular heart disease, or degenerative primary electrical disease (fibrosis and calcification of the sinus node and conduction system).

Causes

Life Threatening Causes

Life-threatening causes include conditions which may result in death or permanent disability within 24 hours if left untreated.

Acute coronary syndrome Acute myocardial infarction Acute renal failure Acute respiratory failure Acute rheumatic fever Bacterial endocarditis Beta blocker overdose Carbamate poisoning Cervical spine injury Diabetic ketoacidosis Digitalis toxicity Drowning Electric shock Electrolyte imbalance Hypoglycemia Increased intracranial pressure Lateral medullary syndrome Lily of the valley poisoning Lithium toxicity

Myocardial infarction Myocardial rupture Myocarditis Nerve agent poisoning e.g. sarin NSTEMI Organophosphate poisoning Parathion poisoning Poisonous spider bites Pulmonary embolism Rabies Sepsis Septic shock Severe brain injury Severe hypothermia STEMI

Common Causes

• Acetylcholine
• Acute coronary syndrome
• Acute rheumatic fever
• Aging
• Amiodarone
• Antiarrhythmic agents
• Bacterial endocarditis, especially of the aortic valve
• Beta blocker
• Bundle branch block
• Calcific aortic stenosis
• Calcium channel blockers
• Cardiac arrhythmia
• Cardiac catheterization
• Cardiomyopathy
• Complete or third-degree AV block
• Congestive heart failure
• Coronary ischemia
• Degenerative disease
• Diabetic ketoacidosis
• Digitalis toxicity
• Digoxin
• Dilated cardiomyopathy
• Diltiazem
• Electrolyte imbalance
• Enhanced vagal tone
• First degree AV block
• Hashimoto's thyroiditis
• HCM
• Hyperkalemia
• Hypermagnesemia
• Hypertension
• Hypertensive heart disease
• Hyperthyroidism
• Hypertrophic cardiomyopathy
• Hypothermia
• Hypothyroidism

• Iatrogenic after surgical correction of VSD, tetralogy of Fallot, and endocardial cushion defect
• Increased vagal tone (e.g. sleep, athletes)
• Inferior ST elevation MI
• Ischemic heart disease
• Massive calcification of the mitral annulus
• Medications ( e.g. adenosine, amiodarone, beta-blockers, diltiazem, procainamide, verapamil)
• Methylprednisolone
• Myocardial infarction
• Myocarditis
• Nausea
• Normal variants
• Normal variation in vagal tone
• NSTEMI
• Obstructive sleep apnea
• Organophosphate poisoning
• Penetrating and non-penetrating trauma of the chest
• Pericarditis
• Phenytoin
• Premature atrial contractions
• Renal failure
• Sclerodegenerative disease of the electrical conduction system
• Second degree AV block
• Sedative
• Sepsis
• Severe brain injury
• Sick sinus syndrome
• Sinus arrest
• Sinus bradycardia
• Sinus node fibrosis
• Sleep
• STEMI
• Systemic lupus erythematosus
• Valvular heart disease
• Verapamil

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Causes in Alphabetical Order

Aceclidine Acepromazine Acetylcholinesterase inhibitor Adenosine Amiodarone Amodiaquine Anorexia nervosa Apnea of prematurity Asphyxia neonatorum Atenolol Athletes Atrioventricular block Autonomic neuropathy Barbiturates Beta-blockers Brucellosis Bupivacaine Calcium channel blocker Carbamate Cardiac arrhythmia Cardiac catheterization Cardiac dysrhythmias Cardiomegaly Cardiomyopathy Catecholaminergic polymorphic ventricular tachycardia Cerebral hemorrhage Cerebral venous sinus thrombosis Chagas' disease Clomipramine Clonidine Colorado tick fever Congenital central hypoventilation syndrome Congenital long QT syndrome Cushing reaction Cushing reflex Cushing triad Cyclic antidepressant poisoning Detomidine Digitalis Diltiazem Diphenhydramine Distichiasis - heart and vasculature anomalies - sinus bradycardia Donepezil Doxepin Drowning Emery-Dreifuss muscular dystrophy Enema Fetal distress Gamma-hydroxybutyric acid Gastric lavage Glyceryl trinitrate Grayanotoxin Hantavirus pulmonary syndrome Hashimoto's thyroiditis Heat exhaustion Hellebore Holt-Oram syndrome Hydrocodone Hydroxyethyl starchSpeedball (drug) Hypercalcemia Hyperkalemia Hypokalemia Hypothermia Hypothyroidism Ibuprofen Increased intracranial pressure Isosorbide dinitrate

Ivabradine Legionella pneumonia Levobetaxolol Levobupivacaine Lidocaine Lithium Malnutrition Mammalian diving reflex Medetomidine Mefloquine Mepivacaine Methacholine Methyldopa Morphine Moxonidine Mycoplasma pneumonia Nadolol Nalbuphine Nalmefene Necrotizing enterocolitis Neonatal lupus erythematosus Neurocardiogenic syncope Neurogenic shock Obstructive jaundice Oculocardiac reflex Opioid poisoning Oxymorphone Phenobarbital Phenylephrine Phenytoin Pilocarpine Pneumothorax Propafenone Propranolol Pulseless ventricular tachycardia Quinidine Radiocontrast toxicity Raised Intracranial pressure Rapid sequence induction Reserpine Right bundle branch block Ropivacaine Second degree AV block Sedatives Septic shock Sick sinus syndrome Sinoatrial block Skull fracture Sleep ST elevation myocardial infarction complications Subarachanoid hemorrhage Sulpiride Suxamethonium chloride Tacrine Theobromine poisoning Timolol Trazodone Trypanosoma cruzi Tularaemia Typhoid fever Uncaria tomentosa Vagal episode Vasa previa Vasovagal syncope Vertebral subluxation Xylazine