- Design
- retrospective cohort study of Medicare claims with Poisson regression and robust standard errors
- Population
- 7,252 men undergoing artificial urinary sphincter or male urethral sling, 2014 to 2016, mean age 74.2
- Primary outcome
- 30-day complications and device revision or removal within one year
- Effect
- complications adjusted relative risk 2.5 in the frailest versus not frail (global P=0.0001); revision or removal 1.3 (global P=0.04), with no association for comorbidity (P=0.2)
Seven thousand two hundred and fifty-two Medicare men who had an artificial urinary sphincter (62.2%) or a male urethral sling (37.8%) between 2014 and 2016 were analysed retrospectively, with frailty graded by the Claims-Based Frailty Index into not frail, prefrail and mildly-to-severely frail. Mean age was 74.2 years.
Thirty-day complications occurred in 15% and device revision or removal within a year in 11%. Complications rose with frailty — adjusted relative risk 1.5 for prefrail and 2.5 for mildly-to-severely frail against not frail (global P=0.0001) — and also with age and with Charlson comorbidity score. Device revision or removal rose with frailty (adjusted relative risk 1.2 prefrail, 1.3 frail, global P=0.04) and with age, but showed no association with Charlson comorbidity index (global P=0.2).
That dissociation is the finding. Comorbidity predicted early complications but not device failure; frailty predicted both. Frailty is about function — mobility, strength, cognition, dependence — and an artificial urinary sphincter is a device the patient has to operate, with a scrotal pump, several times a day, for years. A man who cannot reliably work the cuff is a man who will have it revised or removed, and no comorbidity count captures that.
The practical move is to assess function rather than to count diagnoses in the preoperative clinic: hand strength and dexterity, cognition, mobility, and who is available to help. A sling asks less of the patient than a sphincter does, and the choice between them is partly a functional one. None of this is a reason to withhold surgery from frail men — incontinence is what is limiting them — but it changes which device and what the consent conversation contains.
- Assess dexterity and cognition, not just comorbidity, before offering an artificial urinary sphincter
- Have the patient demonstrate operating a pump device in clinic where there is any doubt
- Weigh sling against sphincter partly on function; the sling asks less of the patient
- Quote an 11% one-year revision or removal risk as the baseline, higher with frailty
- Identify the carer who will help, and include them in the device teaching
The statistics, in plain English
An adjusted relative risk of 2.5 for 30-day complications in the frailest group is a large effect and it survived adjustment for both age and comorbidity, which is what makes it interesting. The revision and removal association is much weaker — 1.2 and 1.3, with a global P of 0.04 — so read that as a signal rather than a firm gradient. A claims-based frailty index is an administrative proxy derived from billing codes, not a bedside assessment, so it will misclassify individuals; the value is that it still outperformed comorbidity, which suggests a properly measured frailty score would do better.
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