Basic Cardiology – X
All of the following are correct regarding carotid sinus massage EXCEPT?
Right vagus nerve serves to stimulate the sinoatrial (SA) node,
Left vagus nerve mostly innervates atrioventricular (AV) node, which slows conduction between the atria and the ventricles.
- Right carotid sinus massage - decreases the sinus node discharge,
- Left carotid sinus massage - slows atrioventricular conduction.
Afferent signals from carotid sinus are then transmitted via the glossopharyngeal nerve (cranial nerve IX) to the nucleus tractus solitarius (NTS) within the medulla.
Diving reflex in the slowing of AV nodal conduction. Which nerve carries the afferents in this process?
Diving reflex -
Cold water exposure triggers the reflex by initiating afferent impulses from the Trigeminal nerve (cranial nerve V), the predominant sensory nerve of the face.
The impulses then stimulate vagal nuclei in the brain, eventually resulting in the slowing of AV nodal conduction.
Classic Wolff-Parkinson-White syndrome ECG shows all of the following EXCEPT -
Classic Wolff-Parkinson-White electrocardiogram with short PR, QRS >120 ms, and delta wave.
What is the name of arrow mark?
CardioNetworks: Googletrans, CC BY-SA 3.0 , via Wikimedia Commons
delta wave is slurring of the upstroke of the QRS complex. This occurs because the action potential from the sinoatrial node is able to conduct to the ventricles very quickly through the accessory pathway, and thus the QRS occurs immediately after the P wave, making the delta wave.
J waves appear on an electrocardiogram as an elevation of the J point in the terminal portion of the QRS complex. J waves are often benign, but may be associated with malignant ventricular arrhythmias
Which of the following condition Epsilon wave is seen in ECG?
Epsilon wave is a specific ECG finding for arrhythmogenic right ventricular cardiomyopathy (ARVC)
