38: How safe is it to stop giving carvedilol to a heart failure patient?Can the drug be reduced in doses?When you suddenly stop taking carvedilol, what are the effects and dangers?In heart failure patients, what, if any, causes the discontinuation of carvedilol? When it comes to treating cardiac failure, what are the benefits and drawbacks of furosemide? Question 40: Can furosemide be administered once daily in heart failure? Question 41: What are the clinical signs and symptoms of a Valsalva's sinus rupture? Question 42: Does a dose of 2.5-10 g/kg/min of dobutamine cause significant tachycardia? Are beta-blockers recommended for heart failure?If so, in all cases or just a few? Question 44: Why does taking digitalis for a long time lead to gynecomastia? Question 45: Why are arrhythmias caused by toxic doses of digoxin, which decrease cardiac tissue's excitability, but not by therapeutic doses, which increase cardiac tissue's excitability? Question 46 One of the side effects of digitalis is hypokalemia.K is given as part of treatment.How does hyperkalemia make digitalis more toxic? Question 47: Why should serum potassium be measured before digoxin treatment? Question 48: Loop diuretics like furosemide can be given intravenously to quickly reduce pulmonary oedema.Is this because arteriolar vasodilatation, which reduces afterload independently of its diuretic effect, is to blame?I ask this because I have been informed that this medication has a venodilatatory effect rather than an effect on arterioles (with the exception of efferent arterioles in the kidney).What might have led to such divergent opinions