Sharp Ekg Comprehensive Exam Study Guide Complete Questions And Solutions

SHARP EKG COMPREHENSIVE EXAM
STUDY GUIDE COMPLETE QUESTIONS AND
SOLUTIONS

●● myocardium
Answer: *middle* muscular layer of the heart


●● pericardium
Answer: *outer* membrane surrounding the heart


●● sinoatrial node (SA node)
Answer: - right upper atrium
- pacemaker cells (60-100bpm)


●● atrioventricular node (AV node)
Answer: - lower right upper atrium
- backup pacemaker (40-60bpm)


●● R-R interval
Answer: - peak of R wave to peak of next R wave
- interval can be measured to show regular or irregular rhythm

,●● isoelectric line
Answer: baseline of the ECG


●● ECG small square
Answer: 0.04 seconds


●● ECG large square
Answer: 0.20 seconds


●● ECG strip length
Answer: 6 seconds


●● heart rate can be determined by...?
Answer: either...
- counting # of R waves in 6 sec strip and multiplying by 10
- counting # of small squares in an R interval and then (1500 / # = HR)


●● P wave
Answer: - first deflection
- depolarization of the atria

, ●● normal P wave
Answer: - smooth and rounded
- <2.5mm in height


●● abnormal P wave
Answer: - tall and peaked
- >2.5mm in height


●● PR interval
Answer: - P wave AND straight line that follows
- measured from beginning of P wave until beginning of QRS complex


●● normal PR interval
Answer: 0.12-0.20 seconds


●● abnormal PR interval
Answer: - PR interval <0.12 seconds (electrical impulse bypasses AV
node)
- PR interval >0.20 seconds (electrical impulse delayed from AV node)
-> can be associated w/ aging


●● QRS complex