4. Identify the mechanical event associated with each of the following electrica

Question

4. Identify the mechanical event associated with each of the following electrical components of an ECG. Circle the appropriate answer (only one answer each). P-R Interval: Atrial systole /Atrial diastole /Ventricular systole /Ventricular diastole Q-T Interval: Atrial systole/ Atrial diastole/Ventricular systole /Ventricular diastole T-R Interval: Atrial systole /Atrial diastole /Ventricular systole/Ventricular diastole 5. Identify the mechanical event associated with each of the following electrical events R-wave-pulse interval Pulse wave 6. Compare the 0 to 30 sec postexercise data to the preexercise data. Indicate whether each of the following increased, decreased, or remained roughly the same postexercise. Circle your answer. P-R Interval Q-T Interval T-R Interval R-wave-pulse interval Increase/Decrease/Same Pulse wave amplitude Increase/Decrease / Same Increase/ Decrease/ Same Increase /Decrease/Same Increase /Decrease/Same 7. How do the changes in the intervals and amplitude between preexercise and 0 to 30 sec post- exercise identified in question 6 compare with the change in heart rate observed between pre-exercise and 0 to 30 seconds post-exercise? Explain how conduction velocity and time spent in systole and diastole may be influencing the changes observed in the intervals. What may have influenced the pulse wave amplitude? P-R Interval: Q-T Interval: T-R Interval: R-wave-pulse interval Pulse wave amplitude: Using the averages from your table, calculate the percent of time the ventricles spent in systole and the percent of time the ventricles spent in diastole using the following equations: Ventricular systole: IQ-T Interval (sec)/Beat period (sec)] . 100 Ventricular diastole: IT-R Interval (sec)/ Beat period (sec)]. 100 Ventricular Systole: Preexercise Ventricular Diastole: Preexercise a. % 0 to 30 sec Postexercise % 0 to 30 sec Postexercise

Explanation / Answer

4. The electrical events occuring during cardiac cycle can be read through ECG (Electroardiogram), in which the systole and diastole of atria and ventricles are represented by PQRST waves.

P-R interval ------------> Atrial systole

Q-T interval ----------------> Ventricular systole

T-R interval -----------------> Ventricular diastole (ventricular diastole starts from T wave)

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