2025-2026 Relias telemetry test answers
3 drugs that can prolong QT interval - ansLidocaine, Amiodarone, digoxin, haldol
Absolute refractory period - ansAll the cells can't respond to any stimulus; encompasses
the QRS and the first part of the T wave
Escape - ansIf the SA node fails as pacemaker or it's rate drops below the normal
range, the AV junction would probably take over. Safety mechanism/fail safe
Irritability - ansWhen the AV junction or ventricle speed up and take over as pacemaker;
become faster than SA node
Order of Conduction - ansSA node--> intraatrial pathways--> AV node--> Bundle of
HIS-->left & right bundle branches--> purkinje fibers
P wave represents - ansAtrial depolarization
PRI - ans0.12-0.20 seconds
Represents both atrial depolarization & delay in AV node
QRS - ansLess than 0.12 seconds
Ventricular depolarization
Sympathetic branch - ansAffects both the atria and ventricles. Increases HR,
conduction, and irritability
T wave represents - ansVentricular repolarization
What arrhythmias may require a pacemaker - ansSymptomatic AV blocks:
-second degree type I
-second degree type II
-third degree heart blocks
Symptomatic sinus node dysfunction:
-bradycardia
-sinus arrest
-sinus block
-sick sinus syndrome
When is a pacemaker used - ansPost-op cardiac surgery, for tachydysrhythmias, for
effects of medications
2nd Degree Heart Block (Mobitz II) - ansRare, but more serious
Sudden appearance of a nonconducted P-wave
P-waves are nl, but some aren't followed by a QRS complex
PR & RR intervals are constant
2nd degree heart block type 1 (Wenkebach) - ansProgressively longer PR interval until
the P wave is not followed by a QPR