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5 Cards in this Set

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What is sinus tachycardia?
It is a rapid heart rate(>100) that originates in the SA node. It can be considered normal in exercise conditions and anxiety.
On the EKG, the atrial firing occurs so rapidly that the P waves overlap the T waves.
How does sinus tachycardia compare with nodal tachycardia?
Here, the AV node is the pacemaker. The QRS complexes are not preceeded by P waves; instead, the P waves travel retrograde from the AV node and are seen inverted on the T waves.
In other cases, the P waves may be seen before, after or lost in the QRS complex.
What is Wolff-Parkinson-White syndrome?
In addition to the normal AV nodal conduction pathway, there is a bypass pathway directly from atrium to ventricle, which bypasses the AV node, resulting in a bizarre QRS configuration.
When one pathway travels retrograde back to the other in a reverberating loop, it may result in a very rapid supraventricular tachycardia.
How can supraventricular tachycardia be treated conservatively?
Carotid sinus massage may help eliminate this by stimulating vagal activity.
What is first degree heart block?
here, the impulses are delayed in getting through the AV node. The p-R interval is >0.20 sec , but the impulses still get through.