Medical MCQ - A 48-year-old patient with signs and symptoms of congestive hea failure presented to the emergency depament. Following stabilization, he was admitted and staed on an inotropic drug 4 months into therapy, the patient staed complaining of yellow scotomas and xanthopsia. An ECG was also conducted. What is the mechanism of action of the drug that was staed?

A 48-year-old patient with signs and symptoms of congestive hea failure presented to the emergency depament. Following stabilization, he was admitted and staed on an inotropic drug 4 months into therapy, the patient staed complaining of yellow scotomas and xanthopsia. An ECG was also conducted. What is the mechanism of action of the drug that was staed?

B1 agonist

PDE3 inhibitor

Inhibition of Na-K ATPase pump

B2 antagonist

Question Category:

Unknown

Correct Answer:

Inhibition of Na-K ATPase pump

Description:

The above ECG shows alternating narrow and broad QRS complex with negative T waves following a broad QRS suggestive of Ventricular BIGEMINY. Ventricular BIGEMINY is a type of VPC characterised by alternate VPC and sinus rhythm. It is also the most common arrhythmia caused by digoxin. Digoxin is an inotropic drug which inhibits Na-K ATPase pump and has been found to cause Visual disturbances in the form of xanthopsia and yellow scotomas.

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