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Assume: X-axis is time (20mm or 20 small boxes/second)
Y-axis is voltage (10 mm or 10 small boxes/1 mVolt)
1. How much time did it take to complete each cycle of contraction? (RR- Interval)
PR#1 _____, PR#2 ______, PR#3 _____ --> Average ______
Is this a normal heart rate? _____. Is this sinus bradycardia, normal sinus rythm, or sinus tachycardia? _______
2. How much time was required to pass through the AV Node (and atria)? (PR-Interval)
PR-I #1:_________PR-I#2:_________PR-I#3:__________ --> Average=______________
Would this time increase or decrease if the person developed a 1st degree heart block later in the day?
3. How much time did the ventricle spend either depolarized or repolarizing? (QT-Interval)
QT-I#1:______________QT-I#2:____________QT-I#3:________ --> Average=______________
If the QT-interval became longer, would the hearts oxygen demands go up or down?
4. How much time did the heart spend generating force? (ST-Segment)
What are actin and myosin in the cardiomyocytes doing once calcium has allowed troponin to be removed from myosin? (Assume adequate ATP supplies)
5. How much time did the heart spend in diastole? (time from end of T-wave to start of next P-wave)
TP#1:____________TP#2:______________TP#3:_____________ -- > Average=____________
If the heart rate increased and the QT-interval was unchanged would the T-P time increase or decrease?
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