Normal Sinus Rhythm- Exam Questions and Correct Answers Latest Update 2025 (Graded A+)
placement of 5-lead ECG - Answers white - right upper chest
green - right lower chest
black - left upper chest
red - left lower chest
brown - mid chest
pathways of cardiac conduction - Answers sinoatrial (SA) node...internodal pathways/bachman's
bundle...atrioventricular (AV) node... right and left bundle of his...distal bundle branch...purkinje fibers
intrinsic heart rates
(SA node, AV junction, ventricles) - Answers SA node - 60-100bpm
AV junction - 40-60bpm
Ventricles - 20-40bpm
positive deflection - Answers any wave with an upward deflection
isoelectric line - Answers marks the beginning and endpoints of all waves
negative deflection - Answers any wave with downward deflection
artifact - Answers abnormal pattern caused by 'outside' sources such as movement, electrodes,
equipment failures, or problems with grounding
P-wave - Answers electrical activity associated with atrial depolarization (conduction)
usually rounded and upright
duration: 0.06-0.12 seconds
PR interval - Answers tracks the atrial impulse from the atria through the AV node, bundle of his and the
right and left bundle branches
duration: 0.12-0.20 seconds
Q-wave - Answers the first negative deflection after the P-wave; usually is not present
abnormal if the duration is more than 0.04 seconds
QRS interval - Answers represents the depolarization of the ventricles and blood is ejected from the
ventricles to the arteries thereby creating a pulse
placement of 5-lead ECG - Answers white - right upper chest
green - right lower chest
black - left upper chest
red - left lower chest
brown - mid chest
pathways of cardiac conduction - Answers sinoatrial (SA) node...internodal pathways/bachman's
bundle...atrioventricular (AV) node... right and left bundle of his...distal bundle branch...purkinje fibers
intrinsic heart rates
(SA node, AV junction, ventricles) - Answers SA node - 60-100bpm
AV junction - 40-60bpm
Ventricles - 20-40bpm
positive deflection - Answers any wave with an upward deflection
isoelectric line - Answers marks the beginning and endpoints of all waves
negative deflection - Answers any wave with downward deflection
artifact - Answers abnormal pattern caused by 'outside' sources such as movement, electrodes,
equipment failures, or problems with grounding
P-wave - Answers electrical activity associated with atrial depolarization (conduction)
usually rounded and upright
duration: 0.06-0.12 seconds
PR interval - Answers tracks the atrial impulse from the atria through the AV node, bundle of his and the
right and left bundle branches
duration: 0.12-0.20 seconds
Q-wave - Answers the first negative deflection after the P-wave; usually is not present
abnormal if the duration is more than 0.04 seconds
QRS interval - Answers represents the depolarization of the ventricles and blood is ejected from the
ventricles to the arteries thereby creating a pulse
