Physio/simple/cardio

Front 1

What is sinus tachycardia?

Back 1

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.

Front 2

How does sinus tachycardia compare with nodal tachycardia?

Back 2

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.

Front 3

What is Wolff-Parkinson-White syndrome?

Back 3

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.

Front 4

How can supraventricular tachycardia be treated conservatively?

Back 4

Carotid sinus massage may help eliminate this by stimulating vagal activity.

Front 5

What is first degree heart block?

Back 5

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.