USMLE Forum - Largest USMLE Community

Heart rate response by "drug X' alone and when given pretreatment with the listed drugs:

(Pretreatment with)........ ("Drug X" HR response)

NONE.....................................Incr
Mecamylamine....................... Incr
Prazosin................................ Incr
Atropin.................................. Incr
Propronolol............................ NO change from normal HR

Identify the "Drug X"

A-Methoxamine
B-Epinephrine
C-Physostigmine
D-Norepinephrine
E-Acetylcholine

Sarim,let m ethink,but probably tomorow.Good q..
A

Hola mi amigo sarim…gracias por la pregunta..
I will go for DDD The drugs that that stimulate B1 receptors are Epi and Norepi (NE) NE produce at the beginning bradycadia but then there is a reflex tachycardia due to B1 receptors stimulation, if we give a beta blockers this reflex won’t be present.

bb

DDD

Hola ariadna... como te va ?

OK Ok the answer is "B" (plz try now one more time)

source : kaplan LN pharma

Thanks