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Av Node - Articles

A classical ECG of “Dead sinus node” and a “Sick AV node” ! by Dr. Sangareddi V. Medical Doctor Posted Sun 14 Aug 2011 2:06pm A man  in his 40s presented with an episode of syncope and followed by recurrent episodes of near syncope. His ECG showed (See image) ECG shows absolutely no evidence of sinus activity . That is  sinus arrest. He lives by the mercy of his AV node.(“Great  escape” junctional rhythm  ! ) . Please note ,  It  fires at less than its ... Read on »
AV Node Ablation: Why You Shouldn’t Have It by Mellanie H. Patient Expert Posted Thu 19 Feb 2009 6:31pm One topic, AV node ablation, makes the rounds of the atrial fibrillation discussion groups on a regular basis, and has just come back around again. All at about the same time, several afib patients’ doctors have insisted that they have an AV node ablation with a pacemaker implant. Thus they have come seeking others’ experiences. In this proc ... Read on »
Non compaction of AV node : The curious electrical “archipelagos” and risk of fatal bradycardias ! by Dr. Sangareddi V. Medical Doctor Posted Sun 30 Sep 2012 1:57pm AV nodal tissue is a not compact structure as we would be believe  . But it is a fact ,  AV  node  do attempt  to compact after birth. It is never complete. Note the islands of his bundle entrapped .   Image source : M. Paz Sua´rez-Mier J Am Coll Cardiol 1998;32:1885–90 From the Section of Histopathology, Institute of Toxicology ... Read on »
I had an ablation for AV node reentrant tachycardia...horray !! by braveheart226 Posted Sun 01 Mar 2009 11:00am Hi, all !!    Just wanted to offer some encouragement for those of you considering cardiac ablation. My SVT problem was due to an extra AV node (the natural pacemaker of the heart). I was diagnosed in 2000, at 40 years of age. Over the years I have had episodes of arrhythmia that would not stop on its own and I would need to get a shot o ... Read on »
Embryological basis of WPW syndrome : AV node complexeties unraveled from Amsterdam ! by Dr. Sangareddi V. Medical Doctor Posted Fri 30 Dec 2011 10:37am Most  cardiologists  are familiar with  “Circulation” . We know  it  is a top  cardiology  journal with highest impact factor.  Few of us are  aware  of  a journal called  “Circulation  research” ( I wonder  why it is named  like that ,  as if  the regular   circulation journal  does  not carry research stuff  !) It is one of the  path brea ... Read on »
Did Pope Benedict Have an AV Node Ablation for His Atrial Fibrillation? by Mellanie H. Patient Expert Posted Tue 12 Feb 2013 11:55am There is interesting new information in an article today regarding the Pope’s atrial fibrillation and strokes. It reports that he had a bleeding stroke in 1991, along with a stroke in 2005. The bleeding stroke could certainly explain why he was refusing anticoagulants. Even more interestingly, the article also reports that he had a pacemaker [... ... Read on »
How will you differentiate a wenkebach’s Mobitz type 1 AV block from type 2 second degree AV block if the conduction ratio is 2: by Dr. Sangareddi V. Medical Doctor Posted Wed 11 Nov 2009 10:01pm It is the classical description of wenkebach AV block type 1 there is progressive prolongation of PR interval followed by a blocked p wave and hence a dropped qrs complex. The usual conduction ratio for wenkebach AV block is 3:2 or 4:3 . It is well known wenkebach AV block is usually a benign form of AV conduction defect and it recovers sp ... Read on »
What is the mechanism of complete AV block in inferior MI ? by Dr. Sangareddi V. Medical Doctor Posted Thu 13 Aug 2009 6:27pm 1 Comment Conduction disturbance is a fairly common occurrence following  MI. Inferior STEMI is especially prone for AV blocks. This is because  the  blood supply to AV nodal  tissues and the inferoposterior surface of the heart  share the same arterial territory . AV node gets it supply  90% of time by right coronary artery(RCA )  and 10% by  LCX. Ver ... Read on »
Is verapamil and beta blockers really contraindicated in AV reentry tachycardias of WPW syndrome ? by Dr. Sangareddi V. Medical Doctor Posted Sat 09 Jan 2010 1:22am It is often said , old thoughts  die hard ! It is more so in medical science as we realise ,  perceived fears and  physician phobias  have a long shelf life . A  few  case reports of  verapamil induced acceleration of accessory pathway conduction  was enough , to create a   global  perception among physicians and cardiologists  that any dru ... Read on »
Why ECG evidence for AV dissociation does not occur in majority of patients with ventricular tachycardia ? by Dr. Sangareddi V. Medical Doctor Posted Thu 10 Sep 2009 10:25pm AV dissociation is the specific marker for diagnosing VT. Evidence for AV dissociation manifest in many ways in ECG. *Random p waves unrelated to qrs complexes , fusion beats , capture beats are  the common features that help us diagnose AV dissociation. Unfortunately these  occur only in about  40 % of patients  with VT.(Fusion beats in VT a ... Read on »