This is one of those areas where my thinking has drifted away from the typical EM brouhaha. I don't mind treating asymptomatic HTN that has scary high numbers. I will outline some reasons for this.
1) Personal anecdote. I know, worst possible reason perhaps, yet there it is. I saw a patient as a senior resident that was more or less asymptomatic hypertension. Thought it would be a great case for the sub-i to see. Sub-i sees the patient, does a thorough history and exam, I see the patient too, examine the patient (including a full neuro exam), attending sees the patient, also does a full neuro exam. Not just an ER full neuro exam either, but a lets-teach-the-med-students type of exam. We have a great discussion about asymptomatic HTN, and how we shouldn't treat it, more harm then good, etc etc. The patient then immediately proceeds to become altered from the bleed in their brain, intubated, neuro ICU. Now, would treating the asymptomatic HTN sooner prevent the hemorrhagic stroke in this patient? Probably not. But you feel like a schmuck not treating the BP in retrospect.
2) Patient convenience. Not treating asymptomatic HTN is just fine when you can get someone to a PMD relatively quickly. That is not possible for some patients and some departments. For those, I don't see a reason not to start someone on some BP meds. Usually 25 mg HCTZ once daily or 5 mg amlodipine once daily. Chart looks good, patients like it, I feel better, and if they aren't going to see a PMD for weeks, its probably better for them too.
3) Department politics. Given that asymptomatic HTN is a common thing people (PMDs, RNs, patients, etc) expect to be treated, it is often a little bit (or a lot) of a fight not to. This issue is just not important enough for me to fight over and taint my relationship with my RNs, consultants, PMDs or get a lower PG score over. I've said this before, but it bears repeating: you get one issue that you can legitimately make a stand on and be outside the norm of orthodoxy. Any more than that, and you are 'that guy'. We had an attending in residency who made fighting the asymptomatic HTN battle his thing. Wouldn't treat any asymptomatic number at all. Had a spiel and powerpoint presentation ready to go. I appreciate him and my training was better for having seen that way of practicing, but this is not my issue. I want to save my protest for something else. I am also happy to give kayexylate if the nephrologist wants it, platelets for the SAH on 81 mg ASA if the neurosurgeon wants it, NPO for pancreatitis if the hospitalist wants it, MD note for sniffles if the patient wants it, silly general nursing order the RN wants, etc, so that when I do stomp my foot at something, I am more likely to be taken seriously.