label the P wave, QRS wave, and T wave.

The practical nurse (PN) uses an ultrasound stethoscope to auscultate a client's left dorsalis pedis pulse. Where should the PN place the transducer?

A variety of ways to calculate heart rate from an ECG may be used. The quickest way to calculate heart rate on a rhythm strip is: Count the number of large squares between one R-R interval, and divide this number into 1500. Calculate the number of QRS complexes in 1 minute Count the number of R-R intervals in 6 seconds, and multiply by 10 Count the number of small squares between one R-R interval, and multiply this number by 300.

Duration of one RR interval (time of one heartbeat) Heart Rate (Calculate using the RR interval) Duration of P wave Duration of QRS complex Duration of T wave Duration of PR segment Duration of ST segment Duration of TP segment # of small squares Duration (seconds) beats per min

Where on an EKG tracing do you evaluate ST-segment changes?

rhythm strips

on an EKG strip, a nurse determines that a patient's heart is beating 5 times every 4 seconds. Calculate the time for each heart beat in seconds:  Calculate the patient's heart rate in beats/min:  (Hint: Divide 60 by the time per beat)

What does the QRS complex represent?

The ST segment in the EKG is typically quiet and on the isoelectric line (like the T-P segment).  What is happening during the ST segment in the EKG such that we see no waves? a) There is no electrical activity happening in the ventricles between the S and T waves b) The heart is relaxed and filling with blood c) The ST segment is representative of the plateau of the many ventricular action potentials happening at that point d) There is no longer Na+ influx during the ST segment so no waves are visible e) The ST segment is during ventricular repolarization and repolarization is not seen on the EKG

In an EKG reading: | the P wave corresponds to the AV node firing. the QRS complex corresponds to a time when ventricular pressure is greater than atrial pressure. When in sympathetic mode, the AV Bundle will be receiving impulses at a faster rate then when in parasympathetic mode. | The T wave represents the time when the SA node first fires. The P-R interval represents the delay that occurs when the AV Bundle transmits signals to the Purkinje fibers.