Medicine — Hypertension, NMC MBBS licence examination syllabus (Nepal Medical Council).
Hypertension: treating a number that causes no symptoms
The commonest reason people stop treatment is that it was never making them feel better.
Hypertension is unusual among common diseases in that it produces nothing the patient can feel. There is no pain to relieve, no breathlessness to ease, no symptom that returns when the tablets stop. What treatment offers is a reduction in the probability of a stroke in ten years' time — which is genuinely valuable and almost impossible to notice.
That single fact shapes the whole subject. It explains why adherence is the central practical problem, why explanation matters as much as prescription, and why the diagnosis must be made carefully: you are committing someone to daily medication for decades on the strength of a measurement.
🩺 Where this lives: Hypertension is the leading modifiable risk factor for stroke, and stroke is a leading cause of death and long-term disability in Nepal and comparable countries. The chain from an untreated blood pressure to a hemiplegic patient in their fifties — with a family who must now provide care indefinitely — is one of the most consequential in medicine. It is also one of the most interruptible, with cheap, widely available drugs. The obstacles are detection, explanation and adherence, not pharmacology.
💡 A note on numbers. This chapter contains no threshold values, no stage boundaries and no treatment targets. These differ between major guidelines, have been revised repeatedly, and vary by age and by the presence of diabetes or kidney disease — so a figure quoted here would be wrong somewhere and out of date eventually. Take every number from your current national guideline. Antihypertensive drug classes and their adverse effects are covered in the Cardiovascular Drugs chapter; pre-eclampsia in the Obstetric Emergencies chapter; blood pressure in acute stroke in the Stroke chapter.
Why it matters
The organ damage list is worth learning as a group, because it is what you are preventing and what you should look for at diagnosis: brain (stroke, vascular dementia), heart (left ventricular hypertrophy, heart failure, ischaemia, atrial fibrillation), kidney (chronic kidney disease), and eyes and vessels (retinopathy, aortic disease). Of these, stroke is the harm most strongly and most reliably reduced by treating blood pressure.
Measuring and diagnosing
GETTING THE DIAGNOSIS RIGHT
NEVER DIAGNOSE ON A SINGLE READING. You are proposing
decades of daily medication — confirm it on repeated
occasions before labelling anyone.
TECHNIQUE ERRORS THAT PRODUCE FALSE READINGS:
A CUFF THAT IS TOO SMALL for the arm reads FALSELY HIGH
— the commonest avoidable error, and it systematically
over-diagnoses larger patients
Arm unsupported or below heart level
Patient not rested, talking, or with legs crossed
A full bladder
WHITE COAT EFFECT: blood pressure raised in clinic and
normal outside it. Home or ambulatory monitoring clarifies
this where available, and prevents unnecessary lifelong
treatment.
MASKED HYPERTENSION is the reverse — normal in clinic,
high outside — and is missed unless out-of-clinic readings
are taken.
CHECK BOTH ARMS at first assessment. A consistent
difference between them is itself significant and should
prompt further assessment; thereafter use the arm with the
higher reading.
Thresholds and targets come from the current national
guideline, not from memory.
Primary and secondary
💡 Exam angle: the examinable point is when to look for a secondary cause rather than the exhaustive list of causes. The triggers are a young patient, severe or abruptly worsening hypertension, hypertension resistant to several drugs, or an unexplained biochemical abnormality — particularly a low potassium, which suggests aldosterone excess. Also ask routinely about drugs that raise blood pressure: NSAIDs, corticosteroids, combined oral contraceptives and alcohol.
Total cardiovascular risk
Modern practice treats risk rather than a number in isolation, and this is worth understanding rather than memorising. The same blood pressure carries very different consequences in a fit non-smoker and in a smoker with diabetes — so the decision to treat, and how aggressively, depends on the whole picture: smoking, diabetes, lipids, age, family history, kidney function and existing vascular disease. It follows that stopping smoking often does more good than any antihypertensive, and that lifestyle measures are treatment rather than preamble.
WHAT ELSE TO DO AT DIAGNOSIS
LOOK FOR END-ORGAN DAMAGE — it changes urgency and often
the drug choice:
URINE for protein, and renal function
ECG for left ventricular hypertrophy
FUNDOSCOPY for hypertensive retinopathy
ASSESS OTHER RISK FACTORS: smoking, diabetes, lipids,
weight, family history.
LIFESTYLE MEASURES, which genuinely lower blood pressure:
REDUCE SALT — one of the most effective single changes,
and particularly relevant where processed and
preserved foods are staples
Weight reduction · regular physical activity
Reduce alcohol · stop smoking (for total risk, not for
the blood pressure itself)
THEN THE CONVERSATION THAT DETERMINES SUCCESS:
explain that the treatment prevents a future stroke rather
than treating a present symptom, that it will not make
them feel better, and that stopping when they feel well
defeats the purpose. Adherence is the whole game, and it
is won or lost in that explanation.
Drug classes and their characteristic adverse effects —
ACE inhibitor cough, calcium channel blocker ankle
oedema, thiazide and gout — are in the Cardiovascular
Drugs chapter.
Hypertensive emergency and urgency
💡 Exam angle: the distinction is not the height of the reading — it is whether there is acute end-organ damage. Encephalopathy, papilloedema, pulmonary oedema, aortic dissection or acute kidney injury with a very high pressure is an emergency requiring controlled reduction in a monitored setting. The same number without any of those is an urgency, managed with oral treatment over days. And the classic wrong answer is rapid normalisation — which causes cerebral and renal ischaemia, because chronically hypertensive vessels autoregulate at a higher range.
Clinical reasoning: four presentations
🔍 Case 1 — one reading and a lifetime of tablets
PresentationA 45-year-old attends with a minor injury. His blood pressure is high on a single measurement taken immediately on arrival, using a standard cuff on a large arm, while he describes the accident. He is diagnosed with hypertension and started on medication.
Three errorsOne reading, no rest, and a cuff likely too small.
ReasoningAn undersized cuff reads falsely high, and pressure measured while talking and unrested is unreliable. A lifelong diagnosis should not rest on this.
AnswerRepeat properly — rested, correct cuff size, supported arm, both arms initially — on more than one occasion, with out-of-clinic monitoring where available, before diagnosing or treating.
🔍 Case 2 — young, severe, and low potassium
PresentationA 28-year-old has markedly raised blood pressure that remains high despite three drugs. Her potassium is persistently low, and she takes no diuretic. A fourth agent is added.
Three clues at onceYoung, resistant, and hypokalaemic.
ReasoningEach of these independently suggests a secondary cause; together they make one likely. Unexplained hypokalaemia in particular raises aldosterone excess.
AnswerInvestigate for secondary hypertension rather than escalating blindly — renal and endocrine assessment per guidance, and review drugs and substances that raise blood pressure.
🔍 Case 3 — a very high number in a well patient
PresentationA patient is found to have a very high blood pressure at a routine check. He feels entirely well, with no headache, no visual symptoms, normal fundi, clear chest and normal renal function. The team plans intravenous treatment to bring the pressure down quickly.
Key questionIs there acute end-organ damage?
ReasoningWithout acute organ damage this is a hypertensive urgency, not an emergency. Rapid reduction in a chronically hypertensive patient risks cerebral and renal ischaemia, because autoregulation is set at a higher range.
AnswerOral treatment with reduction over days, close follow-up, and assessment for end-organ damage and secondary causes. Reserve rapid controlled reduction for genuine emergencies.
🔍 Case 4 — "I stopped because I felt fine"
PresentationA man diagnosed two years ago has stopped his medication. He explains that he felt no different taking it, had no symptoms before starting, and assumed he was cured. He is told to restart and warned to be more careful.
What went wrongThe explanation, not the patient.
ReasoningHis reasoning is entirely logical given what he was told. Hypertension causes no symptoms, so treatment cannot relieve any — its purpose is to reduce future stroke risk, and that has to be said explicitly.
AnswerExplain what the treatment is for and what it prevents, ask about side effects and cost as barriers, simplify the regimen where possible, and agree follow-up. Adherence is built here, not by warnings.
Commonly confused
Confusion
The distinction
Why it matters
One reading vs a diagnosis
Confirm on repeated occasions
You are committing someone to decades of treatment.
Correct vs undersized cuff
A small cuff reads falsely high
Systematically over-diagnoses larger patients.
White coat vs true hypertension
Out-of-clinic readings
Prevents unnecessary lifelong treatment.
Primary vs secondary
Young, severe, resistant, or low potassium
Determines whether to investigate further.
Blood pressure vs total risk
The same number means different things
Smoking cessation may matter more.
Emergency vs urgency
ACUTE END-ORGAN DAMAGE, not the number
Determines speed and setting of treatment.
Rapid vs controlled reduction
Autoregulation is set higher
Rapid normalisation causes ischaemia.
Feeling well vs being treated
Treatment prevents; it does not relieve
The commonest reason people stop.
Rapid revision
MUST-KNOW FACTS
1. Hypertension causes NO SYMPTOMS — that is why adherence is so hard.
2. Its greatest harm is STROKE.
3. Also: LVH, heart failure, ischaemia, AF, CKD, retinopathy, aortic disease.
4. Treating blood pressure prevents stroke very reliably.
5. NEVER diagnose on a SINGLE reading.
6. A CUFF THAT IS TOO SMALL reads FALSELY HIGH.
7. Other errors: unsupported arm, talking, not rested, full bladder.
8. WHITE COAT effect: high in clinic, normal outside.
9. MASKED hypertension: normal in clinic, high outside.
10. Out-of-clinic monitoring clarifies both where available.
11. CHECK BOTH ARMS at the first assessment.
12. Most hypertension is PRIMARY (essential).
13. Suspect SECONDARY if: YOUNG, SEVERE, RESISTANT, or abnormal biochemistry.
14. Unexplained LOW POTASSIUM suggests aldosterone excess.
15. Secondary causes: renal disease, renal artery stenosis, endocrine.
16. Ask about NSAIDs, STEROIDS, oral contraceptives and ALCOHOL.
17. Assess TOTAL CARDIOVASCULAR RISK, not the number alone.
18. Risk factors: smoking, diabetes, lipids, age, family history, CKD.
19. STOPPING SMOKING often outweighs any antihypertensive drug.
20. Look for end-organ damage: URINE PROTEIN, renal function, ECG, FUNDI.
21. Lifestyle: REDUCE SALT, weight, activity, alcohol.
22. Salt reduction is among the most effective single changes.
23. HYPERTENSIVE EMERGENCY = high BP WITH ACUTE END-ORGAN DAMAGE.
24. Emergency features: encephalopathy, papilloedema, pulmonary oedema, dissection, AKI.
25. URGENCY = high BP WITHOUT acute organ damage — treat orally over days.
26. The distinction is ORGAN DAMAGE, not the height of the number.
27. DO NOT drop blood pressure rapidly.
28. Chronic hypertension shifts autoregulation to a HIGHER range.
29. Rapid reduction causes CEREBRAL and RENAL ISCHAEMIA.
30. Blood pressure in ACUTE STROKE is a special case — see that chapter.
31. Explain that treatment PREVENTS rather than relieves.
32. Take all thresholds and targets from the current national guideline.
💡 Exam angle: three things recur. Diagnose properly — repeated readings and the right cuff. Decide whether a secondary cause is likely from age, severity, resistance and potassium. And in an acutely high reading, look for end-organ damage rather than reacting to the number, because the temptation to normalise it quickly is the trap.
Syllabus points
Why a symptomless disease is hard to treat
The organs damaged, and stroke above all
Measuring blood pressure correctly
Why an undersized cuff reads high
White coat and masked hypertension
Never diagnosing on one reading
When to suspect a secondary cause
Hypokalaemia as a clue
Drugs that raise blood pressure
Assessing total cardiovascular risk
Looking for end-organ damage
Emergency versus urgency
Why rapid reduction is dangerous
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