Which ECG findings represents a characteristic manifestation of digitalis toxicity?
Correct Answer: Atrial tachycardia with variable block
Description: Digitalis glycosides are effective in increasing myocardial contractility and in the treatment of certain atrial tachyarrhythmias. However, digoxin actually increases myocardial automaticity (increase in premature beats) and facilitates reentry (atrial tachycardias). Digoxin also slows conduction through A V nodal tissue and has central effects that can mimic vagal influence on the heart and thus may produce sinus arrest. Paroxysmal atrial tachycardia with variable block represents the classic rhythm of digitalis intoxication. Digoxin is profibrillatory, but its administration should not lead to atrial flutter. Therapeutic levels of digitalis generate characteristic ST - segment and T-wave changes in most individuals taking the drug. These changes are known as the digitalis effect and consist of ST -segment depression with flattening or inversion of the T wave. The digitalis effect is most prominent in leads with tall R waves. The digitalis effect is normal and predictable and does not require discontinuation of the- drug.
Category:
Unknown
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