Paroxysmal AV block: Difference between revisions

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Revision as of 16:51, 15 June 2020

For patient information, click here

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

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Paroxysmal AV block is defined as a delayed escape rhythm which repetitively blocks conduction from the atria to the ventricles, thereby causing syncope, conduction defects such as asystole and sudden cardiac death.
It may or may not be associated with Phase 3 or Phase 4 conduction defects.
It may be due to an increased vagal tone, innately low adenosine levels or an intrinsic conduction defect, all of which lead to different ECG presentations.
Insufficient data is available regarding the exact etiology, diagnostic study of choice and treatment of paroxysmal AV blocks.
It can be thought of more as a disease of exclusion. However,efforts must be made to have a standardized approach to such patients.
Certain ECG findings are helpful in differentiating between I-AVB, EI- AVB and EV-AVB such as whether atrial or ventricular premature beats, narrow QRS complexes or signs of increased vagal tone (increased PP and PR intervals) precede the period of asystole.

@@ Line 8: / Line 8: @@
 ==[[Paroxysmal AV block overview|Overview]]==
+*Paroxysmal AV block is defined as a delayed escape rhythm which repetitively blocks conduction from the atria to the ventricles, thereby causing syncope, conduction defects such as asystole and sudden cardiac death.
+*It may or may not be associated with Phase 3 or Phase 4 conduction defects.
+*It may be due to an increased vagal tone, innately low adenosine levels or an intrinsic conduction defect, all of which lead to different ECG presentations.
+*Insufficient data is available regarding the exact etiology, diagnostic study of choice and treatment of paroxysmal AV blocks.
+*It can be thought of more as a disease of exclusion. However,efforts must be made to have a standardized approach to such patients.
+*Certain ECG findings are helpful in differentiating between I-AVB, EI- AVB and EV-AVB such as whether atrial or ventricular premature beats, narrow QRS complexes or signs of increased vagal tone (increased PP and PR intervals) precede the period of asystole.
 ==[[Paroxysmal AV Block Historical Perspective|Historical Perspective]]==