DC Cardiac Pacemaker Therapy & Management 3

Question 1

What does the letter 'R' in the fourth position of the NBG pacemaker code signify?

Accepted Answer

Rate-adaptive (rate-responsive) pacing

Answer

Remote monitoring capability

Answer

Refractory period programmability

Answer

Reset to backup mode function

Question 2

When a magnet is applied over a permanent pacemaker, the expected response is:

Accepted Answer

Asynchronous (fixed-rate) pacing regardless of intrinsic activity

Answer

All pacing output ceases immediately

Answer

Conversion to a dual-chamber DDD mode

Answer

Activation of the rate-response sensor

Question 3

The AV delay in a dual-chamber pacemaker is typically programmed to which range?

Accepted Answer

120–200 ms

Answer

20–50 ms

Answer

300–400 ms

Answer

500–600 ms

Question 4

What is the primary concern regarding electrocautery use during surgery in a pacemaker-dependent patient?

Accepted Answer

Oversensing of electromagnetic interference causing inhibition of pacing output

Answer

Permanent battery damage from the electromagnetic field

Answer

Direct thermal injury to the lead insulation

Answer

Lead fracture from the electrical current

Question 5

When a magnet is applied over an implantable cardioverter-defibrillator (ICD), the primary effect is:

Accepted Answer

Tachyarrhythmia detection and shock therapy are suspended

Answer

Asynchronous pacing is initiated at a fixed rate

Answer

An immediate defibrillation shock is delivered

Answer

Anti-tachycardia pacing is permanently disabled

Question 6

A 12-lead ECG showing a left bundle branch block (LBBB) pattern with left axis deviation in a patient with a pacemaker most likely indicates:

Accepted Answer

Right ventricular apical pacing

Answer

Atrial pacing with intact AV conduction

Answer

Biventricular (CRT) pacing malfunction

Answer

Left ventricular pacing via a coronary sinus lead

Question 7

The purpose of the ventricular refractory period (VRP) in pacemaker programming is to:

Accepted Answer

Prevent pacing during the T-wave to avoid the R-on-T phenomenon

Answer

Set the maximum time between consecutive pacing stimuli

Answer

Define the upper rate tracking limit for atrial signals

Answer

Determine how long the device waits after an atrial pace before sensing