PR Interval 0.16, QRS 0.04
PR Interval 0.30, QRS 0.06
PR Interval 0.12, QRS 0.04
PR Interval 0.18, ORS 0.06
A result of artifact.
Suggestive of myocardial ischemia.
Not significant unless it is greater than 5mm.
An expected finding
“I need to count the number of R waves during a six second period and multiply that number by 10.”
“I need to count the number of large boxes present and divide that number by 1500.”
“I need to select an R wave that falls on dark vertical line and number the next 6 dark vertical lines as 300, 150, 100, 75, 60, 50.”
“I need to count the number of small boxes present and divide that number by 300.”
The first downward deflection following the P wave.
Only visible if pathology is present.
Considered normal if less than 0.04 sec duration and less than 25% of the amplitude of the R wave.
Both A and C.
PR interval of 0.14sec
PR interval of 0.18sec
QRS complex of 0.14sec
QRS complex of 0.06sec
"The rate is not important as long as the R waves are spaced equally.”
“Evaluating the overall appearance of the strip is the most important aspect of analyzing ECGs.”
“As long as the measurements are correct, it is not necessary to follow any particular order.”
“It is important to analyze the ECG strip in a systematic fashion.”
Chronic Obstructive Pulmonary Disease (COPD)
An SaO2 of 95%
Sick Sinus Syndrome
A serum potassium level of 4.1 mEq/L