An older patient with dementia is in the hospital and has trouble swallowing. A speech pathologist recommends thickening the liquids the patient drinks with starch or gum and specifies how viscous her tea, water or juice should be. Should it resemble honey? Or apricot nectar?

A doctor writes the order, and the discharged patient returns to her home or nursing facility. She may be drinking thickened liquids from then on.

The rationale is that this sludgy stuff prevents patients from drawing liquids into their lungs and from developing aspiration pneumonia. But does the practice really work? Some geriatricians have doubted it for years.

Now, a large-scale study from the Feinstein Institutes for Medical Research in Manhasset, New York, US, has found that liquid thickening doesn’t actually help such patients.

This happens with some frequency. Medical practices so commonplace that they rarely raise eyebrows turn out — after further investigation — to have scant basis in fact.

“There are plenty of things we do in medicine that have no evidence,” said Dr Matthieu Legrand, an anaesthesiologist and critical care doctor at the University of California, San Francisco (UCSF) in the US.

They continue, accepted but untested, “because we have always done them, so they just keep on happening”.

Dr Legrand is the lead author of a new study examining another common policy: discontinuing certain blood pressure medications a few days before patients undergo major surgery.

Here’s a look at three common medical practices that are getting closer scrutiny.

Thickened liquids

About a decade ago, geriatricians at UCSF decided, as a one-day experiment, to try the same thickened liquids they order for patients.

“We got headaches. We got dehydrated,” recalled Dr Eric Widera, among the participants and author of a recent sceptical editorial in JAMA Internal Medicine.

“We couldn’t do it for 12 hours. We were asking our patients with dementia to do it for the rest of their lives.” Yet, “there wasn’t any evidentiary basis” for the policy,
Dr Widera said.

Now, there is — and it doesn’t support the practice. The Feinstein researchers analysed the medical records of nearly 9,000 older patients (average age: 86) hospitalised with dementia and swallowing difficulties. Their hospital diets consisted primarily of either normally thin or thickened liquids.

Matching the groups for key traits, researchers found no significant difference in length of hospital stay, re-admissions or death rates. Those drinking thickened liquids were less likely to need ventilators but were actually more likely to develop pneumonia or other respiratory problems.

Moreover, drinking sludge “really takes a toll on their quality of life”, said Dr Liron Sinvani, a geriatrician and the study’s senior author. Many such patients are nearing the end of life.

Some will choke or cough when drinking thin liquids, so thicker liquids make sense. Some don’t dislike thickened ones. “We can’t say 100 per cent this is a wrong practice,” Dr Sinvani said. “But we can question it. It’s not clear that what we’re doing is best for people.”

Blood pressure regimens

Between 25 per cent and 50 per cent of patients undergoing surgery are taking blood pressure medications called ACE inhibitors (benazepril, lisinopril and other -prils) or angiotensin II receptor blockers (candesartan, olmesartan and other -sartans), Dr Legrand said. “For older adults, it’s a higher number,” he added.

For many kinds of surgery, patients are routinely advised to stop those drugs before the scheduled operation. Doctors fear that blood pressure will drop too low during the procedure, causing complications such as heart failure, stroke or kidney problems.

If patients forget or confuse their instructions and don’t stop the drugs on time, doctors may actually postpone or cancel operations. Without the medications, though, patients’ blood pressure could rise dangerously.

To determine what really happens, a study randomised 2,200 patients (average age: 68) undergoing a variety of non-cardiac surgeries at 40 hospitals in France. Half of the patients continued using ACE inhibitors or ARBs until the day of surgery; half were told to stop taking ARBs 48 hours before the operations.

During the procedures, blood pressures were more apt to fall in the group continuing the drugs. “But the rate of complications was exactly the same”, about 22 per cent in each group, said Dr Legrand, lead author of the study published in JAMA.

The groups had comparable rates of post-surgery heart attacks, strokes, sepsis, respiratory and kidney complications, intensive care admissions and deaths. A large international study and another in Britain recently reached similar conclusions.

Cardiac surgery is different, Dr Legrand cautioned. Those patients are at higher risk; in most hospitals, they’re told to continue their blood pressure drugs.

But for other operations, “patients don’t necessarily have to stop their medications”, he said. “This is a conversation they can have with their doctors.”

Spine implant for back pain

The US Food and Drug Administration reported in 2020 that about 50,000 spinal cord stimulators, devices intended to reduce chronic pain using electrical impulses, were being implanted annually — and that over four years the agency had received 1,08,000 reports of patient injuries, including 497 deaths and malfunctioning stimulators.

Annual implantations are likely to have risen since, as doctors seek substitutes for prescription opioids. Do these stimulators work?

Here the dilemma is not lack of evidence but contradictory claims and conflicting findings, with researchers arguing about methodologies and results — a confusing landscape for patients desperately seeking relief.

Pain doctors consider a treatment to be effective if it reduces pain by half in 50 per cent of patients. Potentially confounding such results, however, is the potent placebo effect.

For patients, “the more you have invested, the more likely you are to see an effect”, said Dr Rita F. Redberg, a cardiologist at the University of California, San Francisco, and a co-author of a recent study in JAMA Neurology.

NYTNS