A cross-sectional analysis of 1,465 community-dwelling adults aged 65 and over undergoing comprehensive geriatric assessment classified frailty by the Fried phenotype and anticholinergic burden by the Anticholinergic Cognitive Burden Scale, dichotomised as absent or present. Orthostatic hypotension was defined conventionally: a fall of at least 20 mmHg systolic or 10 mmHg diastolic within three minutes of standing.
Orthostatic hypotension became commoner with frailty — 6.6% in robust, 12.1% in prefrail, 14.5% in frail participants (P = .03). Among the 181 with orthostatic hypotension, the consequences of anticholinergic burden differed by frailty stage. In prefrail people, any anticholinergic burden was independently associated with dependency (odds ratio 3.50, 95% CI 1.30 to 9.41). In frail people, it was associated with falls (2.39, 1.13 to 5.05) and with cognitive impairment (3.63, 1.63 to 8.07). Sensitivity analyses were consistent.
The useful framing is that these are two problems that clinicians tend to manage separately and that compound. Orthostatic hypotension is measured, noted and rarely acted on; anticholinergic burden is reviewed, if at all, as a generic tidying exercise. Put together, they identify a specific patient in front of you today. Anyone who is frail, drops their pressure on standing, and is on an anticholinergic has one clearly modifiable factor, and it is the prescription. Note that any burden at all — a score of one — was the threshold here, not a high score: a single bladder antimuscarinic, sedating antihistamine, tricyclic or older antipsychotic is enough.
- Measure lying and standing blood pressure in every frail patient — it takes three minutes and is routinely skipped.
- Calculate anticholinergic burden explicitly rather than eyeballing the list; a score of one already matters here.
- Bladder antimuscarinics, sedating antihistamines, tricyclics and older antipsychotics are the usual culprits.
- Stop or substitute one drug at a time and re-measure standing blood pressure at review.
- Review the antihypertensives at the same visit; treating the drop is not only about anticholinergics.
The statistics, in plain English
This is cross-sectional, so falls and cognitive impairment were measured at the same moment as the drug exposure and the direction of cause is not established — a patient with cognitive impairment may have been prescribed the anticholinergic because of it. The intervals are wide, from 1.30 to 9.41 for dependency, because only 181 people had orthostatic hypotension. Dichotomising burden as present or absent is crude but makes the threshold usable at the bedside.
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