EKG test - NW Hospital Exam Review/ Qs &
Ans/ Already Graded A+.
what is the range for the PRI? - Answer: 0.12-0.20 seconds
what is the range for the QRS interval? - Answer: 0.06 - <0.12 seconds
what is the range for the QT interval? - Answer: 0.32 - 0.44 seconds (for HR in the 60-100's)
what does depolarization mean? - Answer: contraction of the heart
what does repolarization mean? - Answer: relaxation of the heart (filling period)
name the two types of refractory periods - Answer: 1. absolute refractory period
2. relative refractory period
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, describe the RRP (relative refractory period) and why it can be lethal - Answer: RRP - It is
possible for a stimulus to cause another action potential, therefore this is the vulnerable period
of the cardiac cycle.
ex: the longer the QT interval, the more increased risk for the RRP
(zofran, methadone, haldol and amio lengthen the QT interval)
what does the p wave represent? - Answer: atrial depolarization
how is the atrial heart rate counted? - Answer: P-P interval
what does the PRI represent? - Answer: Represents conduction time thru the atria, AV node and
purkinje fibers
what does the QRS interval represent? - Answer: Represents ventricular depolarization
how is the ventricular heart rate counted? - Answer: by counting the number of R-R waves
what does the QT segment represent? - Answer: represents the beginning of ventricular
repolarization
what is the J point? - Answer: This is the point where the QRS complex ends and the ST segment
begins.
ST elevation or depression of ___________ mm in more than 2 neighboring leads suggests
myocardial ischemia, injury or infarction. - Answer: 1-2 mm
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Ans/ Already Graded A+.
what is the range for the PRI? - Answer: 0.12-0.20 seconds
what is the range for the QRS interval? - Answer: 0.06 - <0.12 seconds
what is the range for the QT interval? - Answer: 0.32 - 0.44 seconds (for HR in the 60-100's)
what does depolarization mean? - Answer: contraction of the heart
what does repolarization mean? - Answer: relaxation of the heart (filling period)
name the two types of refractory periods - Answer: 1. absolute refractory period
2. relative refractory period
Page 1 of 7
, describe the RRP (relative refractory period) and why it can be lethal - Answer: RRP - It is
possible for a stimulus to cause another action potential, therefore this is the vulnerable period
of the cardiac cycle.
ex: the longer the QT interval, the more increased risk for the RRP
(zofran, methadone, haldol and amio lengthen the QT interval)
what does the p wave represent? - Answer: atrial depolarization
how is the atrial heart rate counted? - Answer: P-P interval
what does the PRI represent? - Answer: Represents conduction time thru the atria, AV node and
purkinje fibers
what does the QRS interval represent? - Answer: Represents ventricular depolarization
how is the ventricular heart rate counted? - Answer: by counting the number of R-R waves
what does the QT segment represent? - Answer: represents the beginning of ventricular
repolarization
what is the J point? - Answer: This is the point where the QRS complex ends and the ST segment
begins.
ST elevation or depression of ___________ mm in more than 2 neighboring leads suggests
myocardial ischemia, injury or infarction. - Answer: 1-2 mm
Page 2 of 7
