Member Comments are provided by individuals and reflect their personal opinions only. Under NO circumstances should you act on any advice or opinion posted in this forum. ALWAYS check with your personal physician before taking any action regarding your health! MedHelp International and our partners, sponsors and affiliates have no obligation to monitor any comments posted on this site, or the content and/or accuracy of such exchanges. MedHelp International does not endorse the views of any user.
Heart Disease (Expert Forum)
R on T phenomenon /PVCs as triggers forSVT
Answered by
Cleveland - OH
This forum is for questions and support regarding heart issues such as: Angina, Angioplasty, Arrhythmia, Bypass Surgery, Cardiomyopathy, Coronary Artery Disease, Defibrillator, Heart Attack, Heart Disease, High Blood Pressure, Mitral Valve, Pacemaker, PAD, Stenosis, Stress Tests
R on T phenomenon /PVCs as triggers forSVT
by hankstar, Dec 12, 2003 12:00AM
Dear Doctor,
Thanks for taking my questions. How often are R on T PVCs seen on holter monitors results and are they always a potential trigger for V-tach and V-fib in a normal heart or do they carry the same prognosis as a person with NSVT with normal hearts or are more concern given for R on T PVCs in a even a normal heart?
Just one more question . It is my understanding that PVCs are a responsible trigger for about 30% of all PSVTs, why would they trigger a SVT when the focus is in the ventricle , why not trigger full blown VT instead or is it the interuption of the normal sinus beat that the PVC affects that triggers the PSVT and
is indirectly related to the PVC itself?
Thanks in advance. Happy Holidays to the staff at The Cleveland Clinic.
Hank.
Doctor's Answer
by Cleveland Clinic, Dec 13, 2003 12:00AM
, Dec 13, 2003 12:00AM
Hank,
I tried to find exact numbers for how often R on T are seen in normal hearts and did'nt have much success. There is alot of debate of exactly what the significance of the phenomenon means. The short answer to your question is that they are not the most common arrythmia seen on the holter and most often it is a benign phenomenon, meaning that when it happens there is no triggered arrythmia.
As you probably understand with arrythmias from pathways, there are at least 2 pathways, the normal one and one with alternative conduction. When a extra beat, even in the ventricle causes a condition where the normal pathway is refractory to conduction beacuse of the depolarization, the alternaive pathway can take over. So the answer to your question, which seems like you have a pretty good grasp of, is the latter.
Have a nice holiday
I tried to find exact numbers for how often R on T are seen in normal hearts and did'nt have much success. There is alot of debate of exactly what the significance of the phenomenon means. The short answer to your question is that they are not the most common arrythmia seen on the holter and most often it is a benign phenomenon, meaning that when it happens there is no triggered arrythmia.
As you probably understand with arrythmias from pathways, there are at least 2 pathways, the normal one and one with alternative conduction. When a extra beat, even in the ventricle causes a condition where the normal pathway is refractory to conduction beacuse of the depolarization, the alternaive pathway can take over. So the answer to your question, which seems like you have a pretty good grasp of, is the latter.
Have a nice holiday
Thanks for your insight ...
Abe
How often do you get these darn PVC's. I am 38 yrs old, male, not overweight a little elevated cholesteral but not crazy and I get them every 3-4 months for a few hrs at a time.
How about you and are you taking any naturopathic remedies or beta blockers etc ... I was told I could take 12.5 mg of atenenol when and if I get an episode because they are so infrequent they have allowed me to take them when needed. Have you ever heard of this - taking when needed?
Many thanks,
Abe