Blood Pressure: The Twin You Cannot Feel

Chapter 34 · Vihang Rahul Vasa

Every chapter in this part of the book has said the same thing briefly: keep your blood pressure in range. The kidney chapter said pressure matters as much as the sugar. The stroke paragraph called it the single biggest cause. It is time to stop saying it briefly and say it properly. Medical research reports that a high percentage of people with Type 2 Diabetes also have high blood pressure, and that the two together damage the kidneys, the heart, the brain, and the eyes far more than either one alone. High blood pressure, like high plasma glucose (blood sugar), gives you no symptoms. You feel fine, right up to the day you do not.

The two numbers, in plain words. A blood pressure reading has two numbers, written one over the other. The higher one is called the systolic pressure: the pressure in your arteries each time the heart beats and pushes blood out. The lower one is the diastolic pressure: the pressure between beats, while the heart rests and refills. Both matter, and your doctor watches both. Your doctor will tell you the range that is right for you: it depends on your age, your kidneys, and the rest of your health, and it is not the same for everyone. This book gives no target on purpose; that number belongs to your doctor.

My own experience. When I was diagnosed, my blood pressure was on the higher side, and I felt nothing. Today it is within normal limits. There was no single big step that brought it down. It came down slowly, through many small things: losing weight, eating less salt, walking, sleeping well, taking the medicines my doctor chose, and checking it regularly for years. Lasting changes in blood pressure happen slowly. Measure it regularly, keep a chart, and show your doctor your progress.

Home machines and the clinic, which reading to trust. A home blood-pressure machine is a useful thing to own, but be honest about what it is: a tool for watching your trend, not a verdict. Medical guidelines recommend using only machines that have passed independent accuracy testing, many on the market have not, and published lists of validated machines exist, and they advise against wrist and finger devices. If you buy one, buy a validated upper-arm machine, take it to your doctor, and have it checked against the clinic’s instrument once a year. Many people also read higher in a doctor’s room than at home, from nerves alone, so the doctor may ask for your home readings too. The way to think of it: the doctor’s calibrated reading is your standard; the home machine tells you which way you are drifting between visits.

How to measure properly: the part most people get wrong. Sit quietly for five minutes first, back supported, feet flat on the floor. No tea, coffee, tobacco, or exercise for one hour before. Use the same arm each time, resting on a table at the level of your heart, with the cuff on bare skin, not over a sleeve. Do not talk while it measures. Take two readings a minute apart and write both down, with the date and time: morning and evening, on the days your doctor suggests. A reading taken in a hurry, after climbing stairs, with the cuff over a shirt, is not a reading; it is a guess.

What raises it, and what you control. Salt, above everything: the pickle, the papad, the packaged snack, the extra pinch in the dal. Weight. Alcohol. Poor sleep and sleep apnoea (Chapter 44). Stress (Chapter 51). Some common painkillers and cold remedies can push pressure up too: ask your pharmacist or doctor before taking them regularly. The good news is that the same habits this book has asked for all along, less salt, a daily walk, weight down, proper sleep, lower pressure as surely as they lower plasma glucose (blood sugar).

The medicines: the doctor’s, always. Many people with diabetes will need medicines for blood pressure, and the doctor chooses them; some protect the kidneys as well as the heart. Here is the trap I want you to see coming: pressure medicines are the ones people quietly stop, because they “feel fine.” You felt fine before the medicine too: that is the whole problem with this condition. Never stop or reduce a blood-pressure medicine on your own. Stopping suddenly can let the pressure rebound, and medical research links uncontrolled pressure with a sharply higher risk of stroke, including the transient ischaemic attack, or TIA, explained earlier (see Chapter 12). If a medicine makes you dizzy, tired, or unwell, tell your doctor, who can change it. The same rule applies to any blood thinner or heart medicine your doctor has prescribed: never stopped, never skipped, without the doctor’s word. One of the key long-term studies of diabetes and blood pressure, the UK Prospective Diabetes Study (UKPDS), showed something worth remembering: the benefit of controlled pressure lasts only as long as the control does.

The checks that catch the damage. Pressure damages the same organs diabetes does, so the yearly checks are shared: the eye examination, the urine test for microalbumin, the kidney blood test, the heart check (Chapters 10 and 11). Take your blood-pressure log to every visit. A page of home readings tells your doctor more than any single measurement in the clinic.

The message is simple: you cannot feel your blood pressure, so you must measure it. Measure it properly, write it down, take it to your doctor, and never stop the medicines that keep it in range. Sugar and pressure are twins; the book that manages one and ignores the other has managed half a disease.

(References for this chapter, the landmark UKPDS blood-pressure study and its long-term follow-up, the American Diabetes Association position statement on diabetes and hypertension, and the European guideline on how blood pressure should be measured, are listed in Appendix B.)

Illustration: Chapter 34 illustrated summary. Blood pressure can be silent.

Chapter 34 Blood pressure can be silent. The illustrated measurement posture uses an upper-arm cuff on bare skin, arm supported at heart level, back supported and feet flat. Home logs and clinic checks inform doctor-led changes, protecting heart, brain, kidneys and eyes.

Chapter at a glance: an AI-generated illustration to be read with the chapter, not instead of it. The people shown are not real.