Seems like most are in agreement here. I agree, Atropine first, while getting ready to pace. However-
Based on the vitals, by definition this person IS unstable (hypotensive, altered LOC), which means in my system, TCP is the treatment of choice. That said,
in similar situations I have pushed atropine first, and it sometimes works- at least in the short term, but I ALWAYS would apply the pacing pads next, just in case.
It also depends on the patient- some folks can tolerate that BP very well, and altered LOC could mean they are a bit weak or sleepy. You could have a patient who can tolerate those vitals for a surprising amount of time, or they could be rapidly decompensating right before your eyes. Clearly you would be more aggressive(pacing first) in those situations.
I've had patients who call for general weakness, and upon exam, we find they are walking around with a complete heart block, possibly for a day or more. Would I immediately strap them down and start pacing? No- one step at a time. Evaluate and treat the patient, not just their stated problem.
Obviously it can also depend on how many hands you have, but unlike trauma, medical/cardiac calls are situations where we really can make a difference.- We can at least stabilize the patient and buy some time for the hospital to get their ducks in a row- notify cardiology, get an internal pacer ready, notify the interventional cardiology suite and/or OR, notify family, etc.
As was noted, medicine is an art, and yes, protocols are guidelines, but sometimes there's more to what we do than simply cookbook medicine. Experience gives us judgment and perspective, and we need to use that. To me, that is a defining characteristic of a good provider- balancing book smarts with common sense.