Difference between revisions of "CARDIAC ELECTRICAL ACTIVITY-INTERVALS"

Latest revision as of 02:30, 21 March 2023

SUMMARY

1. PR interval: defined from beginning of P wave to the beginning of the QRS complex. Corresponds to the time taken for the impulse to travel from the SA node to the ventricles. Normal: 0.12-0.20 sec.

2. QRS complex: represents ventricular depolarization. Upper limit: 0.12 sec.

3. QT interval: defined from the start of the QRS complex to the end of the T wave. Represents the time from the onset of ventricular depolarization to full repolarization. HR dependent.

4. QTc interval: QT interval that has been corrected for variations in HR (standardised to 60 beats/min) & and permits comparison between and within individuals. Normal: 0.35-0.43 sec.

Image: Dr. Appukutty Manickam.

Reference(s)

Barrett, K.E., Barman, S.M., Brooks, H.L., X, J. and Ganong, W.F. (2019). Ganong’s review of medical physiology. 26th ed. New York: Mcgraw-Hill Education

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 ==Reference(s)==
-Barrett, K.E., Barman, S.M., Boitano, S., Brooks, H.L., Weitz, M., Brian Patrick Kearns, Ganong, W.F. and Mcgraw-Hill Education (Firm (2016). Ganong’s review of medical physiology. 25th ed. New York: Mcgraw Hill Education.
+Barrett, K.E., Barman, S.M., Brooks, H.L., X, J. and Ganong, W.F. (2019). Ganong’s review of medical physiology. 26th ed. New York: Mcgraw-Hill Education
-<br/>Hall, J.E. and Hall, M.E. (2020). Guyton And Hall Textbook Of Medical Physiology. 14th ed. S.L.: Elsevier - Health Science.
-<br/>West, J.B. and Luks, A.M. (2021). West’s Pulmonary Pathophysiology. Lippincott Williams & Wilkins.
 [[Category:Cardiac Electrical Activity]]
 [[Category:Physiology]]