CARDIAC- TELEMETRY EXAM QUESTIONS AND ANSWERS

Along what axis is time measured in an EKG paper? - Answer-across a horizontal axis What does each small square on an EKG strip represent? - Answer-1 mm in length 0.04 seconds What does each large square on an EKG strip represent? - Answer-5 mm in length 0.2 seconds How can a regular rhythm be calculated on an EKG strip? - Answer-when the rhythm is regular, the heart rate is 250 divided by the number of large squares between the QRS complexes I.e. 3 large squares between regular QRS complexes, the heart rate is 83 (250/3=83) How can an irregular rhythm be calculated on an EKG strip? - Answer-count the number of R waves in a 6 second strip and multiply the number by 10 I.e. 7 R waves in a 6 second strip, the heart rate is 70 (7x10=70) True or false: on a typical EKG grid, 5 small squares, or 1 large square, represent 0.2 seconds of time - Answer-true What does the P wave indicate? - Answer-atrial depolarization or contraction of the atrium *no notching or peaking should be present* What is the normal duration of the P wave? - Answer-.20 seconds (less than 5 small squares) What is the normal amplitude of the P wave? - Answer-aka height 3 mm What does the QRS complex indicate? - Answer-ventricular depolarization, or contraction of the ventricles What is the normal duration of the QRS complex? - Answer-.12 seconds Should be 3 small boxes or less