I am currently very confused about adrenergic drugs and their toxic effects particularly reflex bradycardia or tachycardia.
Will someone please clarify the mechanism of this?
Here's what I understand thus far:
1) Decrease in blood pressure can stimulate baroreceptor...
So I got a Kaplan question saying that Ach administration INCREASES heart rate?
I now get the mechanism they're going for. Ach --> peripheral vasodilation --> reflex tachycardia.
But...like...what about the M2 muscarinic receptor on the heart?? Wouldn't Ach directly cause bradycardia by acting...