Most orthostatic workups stop at the moment they should start. The nurse gets a lying pressure and a standing pressure, waits the three minutes the textbook demands, writes “positive orthostatics” in the chart, and the plan writes itself: hold the antihypertensive, push fluids, add compression stockings, maybe midodrine. Everybody feels like something was done. Very little was.
I’m not arguing the definition is wrong. A 20 mmHg drop in systolic or a 10 mmHg drop in diastolic within three minutes of standing is the standard, and it’s a fine standard. But I am arguing that the parts of the workup that change what you do next take a blood pressure cuff and about four extra minutes, and they get skipped in almost every chart I see.
Start with the clock. Stephen Juraschek and the ARIC investigators followed 11,429 middle-aged adults for more than two decades and asked a simple question: which orthostatic measurement predicts trouble? The one taken within the first minute of standing. That early drop was tied to the highest rate of falls, 13.2 per 1,000 person-years, along with fractures, syncope, and car crashes. The three-minute reading, the one everyone waits for, missed people who were already in trouble. A newer ARIC analysis in the very old adds a wrinkle: the early drops track with symptoms, and the drops that persist past four minutes track with falls. So one measurement isn’t a workup. You need the pressure at one minute and again at three, and if the patient is still sinking at three, keep going.
Next, the pulse. The standing heart rate is on the same readout as the pressure and almost nobody records it. It’s the most useful number on the page. Blood pressure isn’t the same as perfusion, and it isn’t the same as the reflex that protects perfusion either. A patient whose pressure drops 30 points while the heart rate climbs 20 has an intact baroreflex and not enough volume in the tank. Think diuretics, poor intake, or a GI bleed you haven’t found yet. A patient whose pressure drops 30 points and whose heart rate barely moves has a broken reflex. Lucy Norcliffe-Kaufmann’s group at NYU put a number on it in 402 patients: a heart rate rise of less than 0.5 beats per minute for every 1 mmHg of systolic drop identified neurogenic orthostatic hypotension with 91% sensitivity and 88% specificity. That’s a bedside test for autonomic failure, and autonomic failure in an older adult means Parkinson’s disease, Lewy body disease, multiple system atrophy, or long-standing diabetes until proven otherwise. The cuff just told you to do a neurologic exam. Most of the time nobody does.
Then the supine pressure, and this is where the reflex to hold the antihypertensive gets people hurt. In Parkinson’s patients with neurogenic orthostatic hypotension, roughly half also have supine hypertension. They drop to 80 standing and have a pressure of 180 lying flat. Stop their blood pressure medicine and you’ve traded a fall risk for a stroke risk, and you won’t see it, because clinic pressures get taken sitting up. Check the pressure flat, after five minutes, before you touch the regimen.
Which brings up the assumption underneath the whole reflex. We’ve been taught that treating hypertension aggressively in older adults causes orthostatic hypotension. Juraschek tested that too, in a 2021 individual-participant meta-analysis of five blood pressure target trials with 18,466 patients. Intensive treatment lowered the odds of orthostatic hypotension. Not raised. Lowered, with an odds ratio of 0.93. It isn’t a large effect, but the direction matters, because the whole “back off the amlodipine” plan rests on the opposite belief. The drugs that reliably cause orthostasis are the ones you’d predict from mechanism: alpha blockers like tamsulosin and doxazosin, tricyclics, the older antipsychotics, and anything that empties the tank. A well-controlled pressure on a thiazide and an ACE inhibitor is rarely the villain.
So the workup that gets skipped isn’t a tilt table or a plasma norepinephrine. It’s a pressure at one minute, a pulse next to every pressure, a supine reading before anyone changes a medication, and a hard look at the list for the drugs that block the reflex rather than the drugs that lower the number. That’s ten minutes with a cuff. Orthostatic hypotension in an older adult isn’t a diagnosis. It’s a finding, and the finding is telling you the reflex is broken. The cuff can tell you which kind of broken. The rest of the visit should go toward finding out why.