Devices

Question 1

Which of the following agents increase defibrillation thresholds? A. propranolol B. verapimil C. propafenone D. dofetilide

Answer 1

B. Verapamil Increase DFTs: amio, lidocaine, mexiletine, moracizine (moricizine), verapamil Decrease DFTs: sotalol, dofetilide and beta-blockers No effect: Propafenone and procainamide appear to have minimal effect on DFT

Question 2

What is the definition of electrical storm?

Answer 2

3 or more episodes of VT or VF in 24 hours

Question 3

In what type of VT might the ventricular electrogram look quite similar or identical to the sinus rhythm V electrogram?

Answer 3

In Bundle branch re-entry VT, the activation of the RV lead via the right bundle may look quite similar to the V electrogram in SR.

Question 4

In this simulated example of a PMT response is the underlying rhythm PMT or an atrial tach? Why?

Answer 4

This is a Vp-A-Vs response, which indicates an atrial tachycardia in the setting of intact AV conduction NOT PMT.

Question 5

In this simulated example of a PMT response is the underlying rhythm PMT or an atrial tach? Why?

Answer 5

In this example there is a Vp-Ar-As-Vp event in which the atrial morphology and rate do not change. This is an Atach without AV conduction.

Question 6

In this simulated example of a PMT response is the underlying rhythm PMT or an atrial tach? Why?

Answer 6

In this example there is an Vp-Ar-As-Vp event but the morphology of the As event following the Ar event has a different morphology. This suggests this is PMT.

Question 7

A pacemaker in a patient with CHB is programmed with a TARP that allows a maximum tracking rate of 150 beats per minute before the patient will go 2:1. The device is programmed with rate response turned on and a maximum sensor driven rate of 180 beats per minute. What will the device do if the sinus rate is 160 beats per minute? What will the device do if the sensor driven rate is 160 beats per minute?

Answer 7

A. 2:1 block

B. Paced p-waves will be tracked 1:1 up to max sensor driven rate. Sensor driven pacing ignores the PVARP

Question 8

Is the patient with this BiV paced QRS morphology likely to be a responder?

Answer 8

Yes. According to a Study in HR Oct 2015, researchers found that a R-wave in V1 and S1 in lead 1 corresponded to a significant increase in EF.

Question 9

Is the patient with this BiV paced QRS morphology likely to be a responder?

Answer 9

No. According to a Study in HR Oct 2015, researchers found that a R-wave in V1 and S1 in lead 1 corresponded to a significant increase in EF.