HOAG ECG COMPREHENSIVE TEST BANK
COMPLETE QUESTIONS AND ANSWERS
GRADED A+
◉ Normal electrical pathway Answer: SA node, AV node, bundle of
His, right/left bundle branch, and Purkinje fibers
◉ Final result of this electrical pathway? Answer: Ventricular
contraction
◉ If the SA node is damaged... Answer: the AV node will fire at a rate
of 40-60 BPM
◉ If the AV node is damaged... Answer: the Purkinje fibers will fire at
a rate of 20-40 BPM
◉ Normal blood flow thru the heart Answer: see photo
◉ Electrical activity, atrial/ventricular contraction are all... Answer:
Interconnected
◉ If the electrical pathway is altered or impaired (Afib, VTach)....
Answer: The blood flow pathway is also affected & vise versa
,◉ Depolarization Answer: Contraction (systole)
◉ Repolarization Answer: Relaxation (diastole)
◉ What does the P wave represent? Answer: Contraction of the
atrium or depolarization
◉ What does the QRS complex represent? Answer: Contraction of the
ventricle or depolarization
◉ The Q wave is the first... Answer: negative deflection after the P
wave
◉ The R wave is the first... Answer: positive deflection after the P
wave
◉ The S wave is the first... Answer: negative deflection after the R
wave
◉ Normal QRS interval Answer: 0.04-0.12 sec (1-3 squares)
◉ What does the T wave represent? Answer: ventricular
repolarization or relaxation
, ◉ How is the PR interval measured? Answer: from the beginning of
the P wave to the beginning of the QRS complex
◉ Normal PR interval Answer: 0.12-0.20 (3-5 squares)
◉ What segment is not measured? Answer: The ST segment
◉ What should be evaluated of the ST segment to identify pathologic
conditions? (elevated or depressed? Answer: The shape and location
◉ How is the QT interval measured? Answer: From the beginning of
the QRS complex to the end of the T wave
◉ Normal QT interval Answer: 0.36-0.44 secs (9-11 squares)
◉ What interval measurement is adjusted for HR? Answer: The QT
interval
◉ When measuring ECG intervals, the measurements must be...
Answer: EXACT- use calipers
◉ One small box Answer: 0.04 seconds
◉ One large box Answer: 0.2 seconds
COMPLETE QUESTIONS AND ANSWERS
GRADED A+
◉ Normal electrical pathway Answer: SA node, AV node, bundle of
His, right/left bundle branch, and Purkinje fibers
◉ Final result of this electrical pathway? Answer: Ventricular
contraction
◉ If the SA node is damaged... Answer: the AV node will fire at a rate
of 40-60 BPM
◉ If the AV node is damaged... Answer: the Purkinje fibers will fire at
a rate of 20-40 BPM
◉ Normal blood flow thru the heart Answer: see photo
◉ Electrical activity, atrial/ventricular contraction are all... Answer:
Interconnected
◉ If the electrical pathway is altered or impaired (Afib, VTach)....
Answer: The blood flow pathway is also affected & vise versa
,◉ Depolarization Answer: Contraction (systole)
◉ Repolarization Answer: Relaxation (diastole)
◉ What does the P wave represent? Answer: Contraction of the
atrium or depolarization
◉ What does the QRS complex represent? Answer: Contraction of the
ventricle or depolarization
◉ The Q wave is the first... Answer: negative deflection after the P
wave
◉ The R wave is the first... Answer: positive deflection after the P
wave
◉ The S wave is the first... Answer: negative deflection after the R
wave
◉ Normal QRS interval Answer: 0.04-0.12 sec (1-3 squares)
◉ What does the T wave represent? Answer: ventricular
repolarization or relaxation
, ◉ How is the PR interval measured? Answer: from the beginning of
the P wave to the beginning of the QRS complex
◉ Normal PR interval Answer: 0.12-0.20 (3-5 squares)
◉ What segment is not measured? Answer: The ST segment
◉ What should be evaluated of the ST segment to identify pathologic
conditions? (elevated or depressed? Answer: The shape and location
◉ How is the QT interval measured? Answer: From the beginning of
the QRS complex to the end of the T wave
◉ Normal QT interval Answer: 0.36-0.44 secs (9-11 squares)
◉ What interval measurement is adjusted for HR? Answer: The QT
interval
◉ When measuring ECG intervals, the measurements must be...
Answer: EXACT- use calipers
◉ One small box Answer: 0.04 seconds
◉ One large box Answer: 0.2 seconds
