Digitalic toxicity produce the following changes in ECG except –
Correct Answer: Prolonged QT interval
Description: Ans. is 'b' i.e., Prolongation of QT interval ECG changes produced by digitalis o First see the relation of ECG and cardiac cycle. P wave represents atrial depolarization. QRS complex represents ventricular depolarization. PR interval represents conduction through AV node. QT interval corrosponds with ventricular depolarization +- ventricular repolarization. ST interval and T wave represent ventricular repolarization. o Digitalis causes PR interval --> due to delayed conduction in AV node. QT interval --> Due to increased contractility and better emptying of ventricle --> L systole. Decrease amplitute or inversion of T wave and ST depression --> Due to interference with repolarization.
Category:
Pharmacology
Get More
Subject Mock Tests
Practice with over 200,000 questions from various medical subjects and improve your knowledge.
Attempt a mock test nowMock Exam
Take an exam with 100 random questions selected from all subjects to test your knowledge.
Coming SoonGet More
Subject Mock Tests
Try practicing mock tests with over 200,000 questions from various medical subjects.
Attempt a mock test now