is a topic covered in the Taber's Medical Dictionary
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Interference with the normal transmission of electrical impulses through the conducting system of the heart. The condition is seen on electrocardiogram as a prolongation of the P-R interval, a widening of the QRS complex, a delay in the appearance of an expected beat, the loss of synchrony of atrial and ventricular beats, or dropped (missing) beats.
Heart block may be produced by temporary changes in vagal tone, drugs or toxins (such as some antiarrhythmics or antihypertensives), infections (such as infective endocarditis or Lyme disease), fibrosis or other degenerative diseases of the conducting system, ischemia or infarction, or other mechanisms.
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Venes, Donald, editor. "Heart Block." Taber's Medical Dictionary, 23rd ed., F.A. Davis Company, 2017. Nursing Central, nursing.unboundmedicine.com/nursingcentral/view/Tabers-Dictionary/753636/all/sinoatrial_heart_block.
Heart block. In: Venes D, ed. Taber's Medical Dictionary. 23rd ed. F.A. Davis Company; 2017. https://nursing.unboundmedicine.com/nursingcentral/view/Tabers-Dictionary/753636/all/sinoatrial_heart_block. Accessed July 20, 2019.
Heart block. (2017). In Venes, D. (Ed.), Taber's Medical Dictionary. Available from https://nursing.unboundmedicine.com/nursingcentral/view/Tabers-Dictionary/753636/all/sinoatrial_heart_block
Heart Block [Internet]. In: Venes D, editors. Taber's Medical Dictionary. F.A. Davis Company; 2017. [cited 2019 July 20]. Available from: https://nursing.unboundmedicine.com/nursingcentral/view/Tabers-Dictionary/753636/all/sinoatrial_heart_block.
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T1 - heart block
ID - 753636
ED - Venes,Donald,
BT - Taber's Medical Dictionary
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PB - F.A. Davis Company
ET - 23
DB - Nursing Central
DP - Unbound Medicine