A paramedic crew responded to the office of a local physician. A 61-year-old male presented with a one-week history of chest pain and shortness of breath.
This Lead II rhythm strip is from a nine-year-old girl being monitored for an outpatient surgical procedure. She has no known heart disease. Her heart rate is 110 per minute. The PR interval is .12 seconds (120 ms), the QRS is upright and narrow at .06 seconds (60 ms), and the rhythm is regular.
This Lead II rhythm strip shows a regular rhythm with narrow QRS complexes and retrograde P waves. The strip was taken from a nine-year-old girl. The rate is about 110 per minute and the PR interval is .12 seconds (120 ms).
This ECG was taken from a 90-year-old woman. We have no other history, unfortunately. It is a good example of a sinus rhythm with complete AV block, also called third-degree AV block.
The defining characteristics of this rhythm include: 1) an underlying rhythm that is regular and with a physiological rate. In other words, the P waves are not so fast that they would not be expected to conduct one-to-one. 2) a second rhythm of regular QRS complexes that is unrelated to the P waves.
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