Ventriculophasic Reflex: Difference between revisions
m New page: {{Chapter|Supraventricular Rhythms}} [[Image:ventrfascreflex.jpg|thumb| Ventriculophasic reflex during second degree AV block type I. The PP interval that follow upon the blocked sinus bea... |
mNo edit summary |
||
| Line 8: | Line 8: | ||
The baroreflex influences both the sinusnode and the AV node and thus both sinus rate and atrioventricular conduction can be influenced. | The baroreflex influences both the sinusnode and the AV node and thus both sinus rate and atrioventricular conduction can be influenced. | ||
{{clr}} | {{clr}} | ||
== References == | |||
<biblio> | |||
#Rosenbaum pmid=13231262 | |||
</biblio> | |||
<analytics uacct="UA-807577-6"></analytics> | |||
Revision as of 19:53, 23 July 2007
| This is part of: Supraventricular Rhythms |
Ventriculophasic reflex is a phenomenon that can be seen during AV block or during ventricular extrasystoles in bigemini. It describes the sinus arrhythmia that exists during a irregular rhythm. The phenomenon has been described by Erlanger and Blackman in 1910 Erlanger. Different theories have been postulated to explain the phenomenon (a.o. by Wenkebach), but the theory as published by Rosenbaum and Lepeschkin in 1955 Rosenbaum is the most accepted.
A positive chronotropic (accelerating) effect on the ventricular contraction is probably caused by stretch on the right atrium by contraction of the ventricles. A negative chronotropic effect (slows down) is probably caused by a vagal reflex caused by stimulation of the carotic arterial baroreceptors by the pressure wave. The result of these two effects determines whether the P-P interval that surrounds the extra beat is shorter or longer than the P-P interval that surrounds the missing beat.
The baroreflex influences both the sinusnode and the AV node and thus both sinus rate and atrioventricular conduction can be influenced.
References
<biblio>
- Rosenbaum pmid=13231262
</biblio> <analytics uacct="UA-807577-6"></analytics>