EKG STRIP COUNTING PRACTICE
SHEET
Guide
1 mini box = 0.04 seconds
5 mini boxes = 1 box
1 Box = 0.20 seconds
PR: 0.12 – 0.20 sec =
3-5 mini boxes
1 box = 5
mini boxes QRS: 0.06 – 0.10 sec =
= 0.20 1-2.5 mini boxes
seconds
QT: <0.44 seconds =
Approx. 10 mini boxes or
less
#1
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Rate: _____PR Interval: _______QRS: _______QT: __________ Rhythm: ____________
QRS is often shorter in Sinus Tachycardia
QT can be prolonged in hypokalemia, certain drug overdoses, and bradycardia
Longer than normal PR interval that is consistent may indicate Heart Block of 1st Degree
#2
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Rate: ______PR: __________ QRS: _________ QT: ______________ Rhythm: _____________
#3
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Rate: ________ PR: ________ QRS: ___________ QT:____________ Rhythm: _____________
*This Rhythm contains PVCs*
#4
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Rate: _______ PR:________ QRS: ___________ QT: ___________ Rhythm: ______________
#5
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Rate: _______PR: _________ QRS: _____________ QT: ___________ Rhythm: ____________
STOP!
Are you having trouble?
Remind yourself to always look for the P wave first and to evaluate all intervals. ALWAYS
count your strip and use the counting guides above to help you.
Know what each wave and interval is significant of. If there are no regular P waves but many
irregular waves, think about how a P wave is atrial contraction. Many atrial contractions are
significant of atrial fibrillation.
#6
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Rate: _______PR: _________ QRS: _____________ QT: ___________ Rhythm: ____________
*There is no PR interval for a-fib*
#7
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Rate: _______PR: _________ QRS: _____________ QT: ___________ Rhythm: ____________
#8
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Rate: _______PR: _________ QRS: _____________ QT: ___________ Rhythm: ____________
#9
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Rate: _______PR: _________ QRS: _____________ QT: ___________ Rhythm: ____________
#10
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Rate: _______PR: _________ QRS: _____________ QT: ___________ Rhythm: ____________
#11
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Rate: _______PR: _________ QRS: _____________ QT: ___________ Rhythm: ____________
#12
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Rate: _______PR: _________ QRS: _____________ QT: ___________ Rhythm: ____________
Answer Key
1. Rate 30; PR: 0.12; QRS: 0.06; QT: 0.32; Sinus Bradycardia
2. Rate 30; PR: 0.20; QRS: 0.08; QT: 0.40; 1st Degree Heart Block
3. Rate 80-90; PR: 0.08; QRS: 0.06; QT: n/a; Sinus Rhythm w/
unifocal PVCs
4. Rate: 200; PR: n/a; QRS: 0.04; QT: n/a; SVT
5. Rate: 70; PR: 0.16; QRS: 0.04; QT: 0.24; Normal Sinus Rhythm
6. Rate: 170; PR: n/a: QRS: 0.04; QT: n/a; aFib w/ RVR (Rapid
ventricular rate)
7. Rate: 50; PR: 0.16; QRS: 0.08; QT: 0.32; Sinus Bradycardia
8. Coarse vFib – rate, no intervals
9. Ventricular Tachycardia (VTACH)
10. Rate: 90; PR: 0.16; QRS: 0.04; QT: n/a; Atrial Flutter
11. Double testing what you know – check #5 – SAME!
12. Torsades de Pointes
