Bradycardia causes

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

Causes

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. 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 of Bradycardia By Organ System

Cardiovascular	Atrioventricular Block, Cardiac arrhythmia, Cardiac Dysrhythmias, Cardiomegaly, Right Bundle Branch Block, Second Degree AV Block, ST Elevation Myocardial Infarction Complications, Sinoatrial Block, Pulseless ventricular tachycardia, Sick sinus syndrome, Cardiomyopathy, Distichiasis - heart and vasculature anomalies - sinus bradycardia
Chemical / poisoning	Carbamate, Opioid poisoning,
Dermatologic	No underlying causes
Drug Side Effect	Aceclidine, Acepromazine, Acetylcholinesterase inhibitor, Adenosine, Amiodarone, Amodiaquine, Atenolol, Barbiturates, Beta-blockers, Bupivacaine, Calcium channel blocker, Clomipramine, Clonidine, Detomidine, Digitalis, Diltiazem, Diphenhydramine, Donepezil, Doxepin, Glyceryl trinitrate , Hydrocodone, Ibuprofen, Isosorbide dinitrate, Ivabradine, Levobetaxolol, Levobupivacaine, Lidocaine, Lithium, Medetomidine, Mefloquine, Mepivacaine, Methacholine, Methoxamine, Methyldopa, Morphine, Moxonidine, Nadolol, Nalbuphine, Nalmefene, Opioid, Oxymorphone, Phenobarbital, Phenylephrine, Phenytoin, Pilocarpine, Propafenone, Propranolol, Quinidine, Reserpine, Ropivacaine, Sulpiride, Suxamethonium chloride, Tacrine, Timolol, Trazodone, Uncaria tomentosa, Xylazine,
Ear Nose Throat	No underlying causes
Endocrine	Hypothyroidism, Hashimoto's Thyroiditis,
Environmental	Grayanotoxin, Hellebore, Hypothermia, Heat exhaustion
Gastroenterologic	Obstructive jaundice, Necrotizing enterocolitis , Typhoid fever
Genetic	Congenital Long QT Syndrome, Catecholaminergic polymorphic ventricular tachycardia, Emery-Dreifuss muscular dystrophy, Congenital Central Hypoventilation Syndrome, Distichiasis - heart and vasculature anomalies - sinus bradycardia
Hematologic	No underlying causes
Iatrogenic	Enema, Gastric lavage, PCI Complications: Radiocontrast toxicity, Rapid sequence induction, Cardiac catheterization
Infectious Disease	Chagas' disease, Hantavirus pulmonary syndrome, Legionella pneumonia and Mycoplasma pneumonia, Tularaemia, Colorado tick fever, Brucellosis, Trypanosoma cruzi, Typhoid fever, Septic shock
Musculoskeletal / Ortho	Holt-Oram syndrome, Vertebral subluxation,
Neurologic	Vasovagal syncope, Vagal episode, Neurogenic shock, Subarachanoid hemorrhage, Raised Intracranial pressure, Autonomic neuropathy, Cerebral hemorrhage, Cerebral venous sinus thrombosis, Cushing triad, Cushing reaction, Cushing reflex, Neurocardiogenic Syncope, Increased intracranial pressure
Nutritional / Metabolic	Hypercalcemia, Hyperkalemia, Hypokalemia, Anorexia Nervosa, Malnutrition
Obstetric/Gynecologic	Fetal distress, Neonatal lupus erythematosus, Vasa previa,
Oncologic	No underlying causes
Opthalmologic	Oculocardiac reflex, Distichiasis - heart and vasculature anomalies - sinus bradycardia
Overdose / Toxicity	Gamma-Hydroxybutyric acid, Hydroxyethyl starch Speedball (drug), Theobromine poisoning, Sedatives Cyclic antidepressant poisoning
Psychiatric	Anorexia Nervosa,
Pulmonary	Apnea of prematurity, Asphyxia neonatorum , Pneumothorax
Renal / Electrolyte	No underlying causes
Rheum / Immune / Allergy	No underlying causes
Sexual	No underlying causes
Trauma	Skull fracture
Urologic	No underlying causes
Miscellaneous	Drowning, Mammalian diving reflex,