Неосознанная потеря тапка: простой признак опасной диабетической нейропатии

I first heard of the “slipping slipper sign” from Professor Surujpal Teelucksingh. The name is like a playful tongue-twister. The question is simple: “Have you ever lost a slipper or flip-flop from your foot while walking and not realised it had come off?” The important detail is the absence of awareness. The footwear has gone but the patient is none the wiser. That may be a warning of severe diabetic damage to the nerves (neuropathy), usually beginning in the feet, that can dull pain, pressure, temperature and position sense. A person may stand on a sharp object, develop a blister from a tight shoe or burn a foot with hot water and feel surprisingly little. Pain is an alarm, and a foot that has fallen silent is not necessarily safe. Professor Teelucksingh and colleagues formally described the sign and compared it with traditional clinical tests for neuropathy. Among people with diabetes, it showed an 83 per cent sensitivity and 91 per cent specificity for severe neuropathy. An independent Jamaican team later tested the sign in 69 patients. The sensitivity was low, meaning that many people with neuropathy did not report losing a slipper. But its specificity and positive predictive value for neuropathy were both 100 per cent in that study. In plain English, the sign could miss disease and therefore could not replace proper screening; but when it was present, it deserved attention. A negative answer did not grant absolution. A positive one rang a bell. Years after I first heard of the sign he challenged me at a medical conference to go further for my Masters research. I had the privilege of exploring another question with a brilliant team including ophthalmologist Dr Neela Ramdass: “if the slipper identifies severe nerve damage, could other organs be involved?” In our 2016 study of 100 people with diabetes, 33 had the slipping slipper sign and 67 did not. Every single one of the 33 with the sign had diabetic eye disease (retinopathy), compared with 12 of the 67 without it. More advanced, proliferative retinopathy was also much more common in the positive group. Protein in the urine was found in 46 per cent of those with the sign, compared with only six per cent of those without it. The numbers were striking, but this was an observational study. A wandering slipper does not cause blindness or kidney disease, and it cannot diagnose either. The same long exposure to high glucose, high blood pressure and other vascular risks can injure nerves, retinal vessels and kidney filters. Complications hunt in packs. That is the larger lesson. Finding neuropathy should prompt a search for retinopathy, kidney disease, vascular disease and the other hazards that may be travelling with it. An eye finding should remind us to examine the feet and assess the kidneys. Protein in the urine should lead us beyond the urine bottle. Modern medicine is capable of astonishing things. We can photograph the retina without dilating the pupil, monitor glucose minute by minute and inspect nerves with ultrasound. We stare at screens while clues sit at our patients’ feet. People with diabetes require regular, comprehensive foot examinations, including assessment of skin, circulation and protective sensation. They need appropriate retinal screening and kidney checks. Feet should be inspected daily, including between the toes and beneath the sole; a mirror or another person can help. New blisters, cuts, colour changes, swelling, discharge or areas of warmth deserve early attention. Walking barefoot is hazardous and footwear should protect without rubbing or squeezing. Control of glucose matters, but blood pressure, cholesterol, smoking, kidney health, nutrition and physical activity also influence the future. A person with numb feet may need more frequent professional review from a podiatrist and properly fitted footwear. Anyone who has lost a slipper without noticing should mention it to a doctor and request a thorough assessment. In busy clinics, especially where specialist equipment and time are scarce, simple validated questions can help identify those needing urgent attention. A community nurse, relative or trained health worker can ask about the slipper. That does not replace examination; it opens the door to it. Low-cost medicine is not inferior medicine when it is evidence-based, properly understood and connected to appropriate care. The humble slipper teaches three things. Listen to the patient’s ordinary stories. Look for the unpleasant companions of any complication you find. Never confuse the absence of pain with the absence of danger. Medicine often looks upward but, every so often, wisdom asks us to look down. If a slipper slips away unnoticed, do not merely replace the pair. Ask what else may be disappearing silently: sensation from the feet, clarity from the eyes, protection from the kidneys. The first rustle in the bush may be no louder than a slipper falling to the floor.