The correct answer is metoclopramide.
Because the PR interval is 6 mm, or 240 ms, there is a first-degree heart block.
Thyrotoxicosis would increase the heart rate, increasing the likelihood of atrial fibrillation with rapid ventricular rate.
The other options would slow the heart rate and potentially cause slow AF.
The correct answer is atria. The rhythm is multifocal atrial tachycardia.
The rhythm is narrow complex, indicating that it originates supraventricular. The P waves are inverted, suggesting that the rhythm originates somewhere other than the sinus node.
Metoprolol, diltiazem (a nonhydropyridine calcium channel blocker) and digoxin are all used to treat atrial fibrillation.
Amlodipine is a hydropyridine calcium channel blocker, which has no effect on heart rate.
The correct answer is 60 degrees.
The correct answer is pericardial effusion.
