Basic EKG Exam Quizzes & 71 Ans/ A+ Score
Solution
Lower leads go BELOW the umbilicus (ignore the pic on that)
Each small square on an EkG represents
0.04 seconds
Each large square on an EKG represents
0.2 seconds (5 small squares)
5 large squares equals
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,One second
Normal PR interval
0.12-0.2 seconds
Normal QRS interval
0.04-0.1 seconds
A prolonged QRS indicates a
Bundle branch block
Normal QT interval time
<0.46
Absolute Refractory Period
Period in which extra electrical signals will not impact cardiac rhythm
"Think toilet analogy"
Relative Refractory Period
Period in which extra electrical signals will impact cardiac rhythm. This
is where we shock for cardioversion.
"Think toilet analogy"
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, How to calculate rate of irregular rhythms:
Count 30 big squares (6 seconds) and multiply by 10
How to calculate regular rhythm rates:
R to R period
How to calculate rate:
1500/small boxes (double check with green sheet)
Characteristics of Sinus Rhythm
Rate: 60-100 BPM
P wave: Present
P for every QRS: Yes
Rhythm regular: Yes
Sinus Bradycardia
Sinus rhythm with a rate <60
Sinus Rhythm
Sinus Rhythm with a rate of 60-100
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Solution
Lower leads go BELOW the umbilicus (ignore the pic on that)
Each small square on an EkG represents
0.04 seconds
Each large square on an EKG represents
0.2 seconds (5 small squares)
5 large squares equals
Page 1 of 19
,One second
Normal PR interval
0.12-0.2 seconds
Normal QRS interval
0.04-0.1 seconds
A prolonged QRS indicates a
Bundle branch block
Normal QT interval time
<0.46
Absolute Refractory Period
Period in which extra electrical signals will not impact cardiac rhythm
"Think toilet analogy"
Relative Refractory Period
Period in which extra electrical signals will impact cardiac rhythm. This
is where we shock for cardioversion.
"Think toilet analogy"
Page 2 of 19
, How to calculate rate of irregular rhythms:
Count 30 big squares (6 seconds) and multiply by 10
How to calculate regular rhythm rates:
R to R period
How to calculate rate:
1500/small boxes (double check with green sheet)
Characteristics of Sinus Rhythm
Rate: 60-100 BPM
P wave: Present
P for every QRS: Yes
Rhythm regular: Yes
Sinus Bradycardia
Sinus rhythm with a rate <60
Sinus Rhythm
Sinus Rhythm with a rate of 60-100
Page 3 of 19
