Ventricular parasystole

WikiDoc Resources for Ventricular parasystole
Articles
Most recent articles on Ventricular parasystole Most cited articles on Ventricular parasystole Review articles on Ventricular parasystole Articles on Ventricular parasystole in N Eng J Med, Lancet, BMJ
Media
Powerpoint slides on Ventricular parasystole Images of Ventricular parasystole Photos of Ventricular parasystole Podcasts & MP3s on Ventricular parasystole Videos on Ventricular parasystole
Evidence Based Medicine
Cochrane Collaboration on Ventricular parasystole Bandolier on Ventricular parasystole TRIP on Ventricular parasystole
Clinical Trials
Ongoing Trials on Ventricular parasystole at Clinical Trials.gov Trial results on Ventricular parasystole Clinical Trials on Ventricular parasystole at Google
Guidelines / Policies / Govt
US National Guidelines Clearinghouse on Ventricular parasystole NICE Guidance on Ventricular parasystole NHS PRODIGY Guidance FDA on Ventricular parasystole CDC on Ventricular parasystole
Books
Books on Ventricular parasystole
News
Ventricular parasystole in the news Be alerted to news on Ventricular parasystole News trends on Ventricular parasystole
Commentary
Blogs on Ventricular parasystole
Definitions
Definitions of Ventricular parasystole
Patient Resources / Community
Patient resources on Ventricular parasystole Discussion groups on Ventricular parasystole Patient Handouts on Ventricular parasystole Directions to Hospitals Treating Ventricular parasystole Risk calculators and risk factors for Ventricular parasystole
Healthcare Provider Resources
Symptoms of Ventricular parasystole Causes & Risk Factors for Ventricular parasystole Diagnostic studies for Ventricular parasystole Treatment of Ventricular parasystole
Continuing Medical Education (CME)
CME Programs on Ventricular parasystole
International
Ventricular parasystole en Espanol Ventricular parasystole en Francais
Business
Ventricular parasystole in the Marketplace Patents on Ventricular parasystole
Experimental / Informatics
List of terms related to Ventricular parasystole

Cardiology Network
Discuss Ventricular parasystole further in the WikiDoc Cardiology Network
Adult Congenital
Biomarkers
Cardiac Rehabilitation
Congestive Heart Failure
CT Angiography
Echocardiography
Electrophysiology
Cardiology General
Genetics
Health Economics
Hypertension
Interventional Cardiology
MRI
Nuclear Cardiology
Peripheral Arterial Disease
Prevention
Public Policy
Pulmonary Embolism
Stable Angina
Valvular Heart Disease
Vascular Medicine

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Ventricular Parasystole

1. An ectopic ventricular pacemaker activates the ventricle concurrently with, but independent of, the impulse of the basic rhythm.
2. It is protected from the impulse of the basic rhythm by entrance block.
3. Its own impulse is able to depolarize the ventricle.
4. Probably due to increased automaticity.
5. EKG findings:
   • varying coupling intervals

     1. With PVCs there is usually fixed coupling

   • RR intervals of the ectopic beats being mathematically related to each other

     1. The interectopic forum is variable, are multiples of the shorter interval
     2. Although the ectopic focus fires regularly, only those that find the ventricles responsive are manifested electrocardiographically.
     3. The ratio between the intervals is seldom exact whole numbers (3:1) and more often 3:2 etc.
     4. Parasystolic rates vary from 20 to 400 BPM
     5. In most patients the rate varies between 30 to 56 BPM
     6. Parasystolic rates greater than 70 BPM is called parasystolic VT.

   • the presence of fusion beats

     1. May discharge at the same time that an impulse of the basic rhythm arrives at the ventricles.
     2. The ventricles are then depolarized by the two wavefronts.
     3. Can occur with regular PVCs, but with parasystole more frequently.

6. It is relatively uncommon
   • Seen in 1 to 1.5/1000 EKGS
   • Long rhythm strip required to demonstrate variability in coupling interval