BAYLOR SCOTT & WHITE EKG TEST
COMPLETE STUDY GUIDE AND CARDIAC
RHYTHM INTERPRETATION REVIEW 2026
◉ Which valves are semilunar valves?
Answer: aortic and pulmonary
◉ Which vessels arise from the root of the aorta?
Answer: right and left coronary arteries
◉ What does the left main coronary artery split into?
Answer: left circumflex (LCx) and left anterior descending (LAD)
arteries
◉ Occlusion of what vessel can lead to ventricular arrhythmia and
death?
Answer: left anterior descending artery (LAD)
◉ SA node
Answer: natural pacemaker of the heart
rate: 60-100
located in the right atrial wall
,◉ Occlusion of the SA node artery can manifest...?
Answer: extreme sinus brady
◉ What two vessels branch off from the RCA?
Answer: sinoatrial node artery and atrioventricular node artery
◉ AV node
Answer: rate: 40-60
- holds electrical signal received from SA node to allow ventricles to
fill with blood
◉ what shows on the EKG tracing when the AV node is not
conducting as expected?
Answer: increases PR interval
◉ Why does a complete heart block happen?
Answer: the AV node is unable to conduct electrical impulses from
SA node to the ventricles
◉ What happens when there is occlusion of the AV node artery?
Answer: high-degree heart block
, ◉ Collateral circulation
Answer: circulation formed by smaller blood vessels branching off
from or near larger, occluded blood vessels
◉ Why don't patients with coronary heart disease experience
symptoms until it is in advanced stages?
Answer: collateral vessels compensate for reduced oxygen supply
◉ ectopic beats
Answer: Impulses originating outside normal conduction pathways
of the heart.
◉ How are ectopic beats seen on an EKG tracing?
Answer: premature atrial complex, premature junctional complex,
premature ventricular complex
◉ Bundle of His
Answer: where the AV node conducts its impulse to
◉ Right bundle branch (RBB)
Answer: - carries impulses from Bundle of His to purkinje fibers of
right ventricle
COMPLETE STUDY GUIDE AND CARDIAC
RHYTHM INTERPRETATION REVIEW 2026
◉ Which valves are semilunar valves?
Answer: aortic and pulmonary
◉ Which vessels arise from the root of the aorta?
Answer: right and left coronary arteries
◉ What does the left main coronary artery split into?
Answer: left circumflex (LCx) and left anterior descending (LAD)
arteries
◉ Occlusion of what vessel can lead to ventricular arrhythmia and
death?
Answer: left anterior descending artery (LAD)
◉ SA node
Answer: natural pacemaker of the heart
rate: 60-100
located in the right atrial wall
,◉ Occlusion of the SA node artery can manifest...?
Answer: extreme sinus brady
◉ What two vessels branch off from the RCA?
Answer: sinoatrial node artery and atrioventricular node artery
◉ AV node
Answer: rate: 40-60
- holds electrical signal received from SA node to allow ventricles to
fill with blood
◉ what shows on the EKG tracing when the AV node is not
conducting as expected?
Answer: increases PR interval
◉ Why does a complete heart block happen?
Answer: the AV node is unable to conduct electrical impulses from
SA node to the ventricles
◉ What happens when there is occlusion of the AV node artery?
Answer: high-degree heart block
, ◉ Collateral circulation
Answer: circulation formed by smaller blood vessels branching off
from or near larger, occluded blood vessels
◉ Why don't patients with coronary heart disease experience
symptoms until it is in advanced stages?
Answer: collateral vessels compensate for reduced oxygen supply
◉ ectopic beats
Answer: Impulses originating outside normal conduction pathways
of the heart.
◉ How are ectopic beats seen on an EKG tracing?
Answer: premature atrial complex, premature junctional complex,
premature ventricular complex
◉ Bundle of His
Answer: where the AV node conducts its impulse to
◉ Right bundle branch (RBB)
Answer: - carries impulses from Bundle of His to purkinje fibers of
right ventricle
