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 · Firstdegree block means that each cardiac impulse eventually makes it from the atria to the ventricles, but the conduction of the impulse is slowed Seconddegree block means that some of the impulses are successfully conducted to the ventricles, but some are not · Bradycardia means a low heart rate, 'sinus bradycardia' means a low heart rate emanating form a normal system 1st degree heart block is a very benign conditon again, with no associated morbidity or mortality It poses no danger to you and you do not need any treatment for it · Arrhythmias and conduction disorders are the most common cardiac complications encountered during pregnancy in women with and without structural heart disease 13 They may manifest for the first time during pregnancy, and in other cases, pregnancy can trigger exacerbations in women with preexisting arrhythmias 1,46 Atrioventricular Block Practice Essentials Background Pathophysiology What is sinus bradycardia with first degree av block

This encounter shows a fast rate over 100 bpm, with a regular rhythm and P waves, indicating sinus tachycardia The extremely long delay between the P wave and QRS indicates first degree heart block Additionally, ectopy is seen in this encounter, in the form of premature ventricularA premature ventricular contraction (PVC) is a relatively common event where the heartbeat is initiated by Purkinje fibers in the ventricles rather than by the sinoatrial nodePVCs may cause no symptoms or may be perceived as a "skipped beat" or felt as palpitations in the chest Single beat PVCs do not usually pose a danger The electrical events of the heart detected by theThe vagus nerve is an efferent tract from the medulla to the heart, causing sinus bradycardia, junctional rhythm, AV block, bigeminy, and nodal beats Bradycardia can also progress to sinus arrest, asystole, or ventricular fibrillation 3–7,10 An episode of the OCR may lead to bradycardia terminating in asystole or to asystole with n