Hypertension Diagnosis & Management — Indian Guidelines
Hypertension affects an estimated 25 crore Indians and is the leading modifiable risk factor for cardiovascular disease, stroke, and chronic kidney disease. India's hypertension burden has grown rapidly with urbanisation, dietary salt intake, and ageing. The Indian Guidelines on Hypertension (IGH) adapt global frameworks (JNC 8, ACC/AHA 2017, ESC/ESH 2023) to Indian dietary patterns, drug availability, and comorbidity profile.
Hypertension is defined as a persistent elevation of arterial blood pressure. It is the most common chronic disease in India and the single largest contributor to cardiovascular mortality. The Indian Guidelines on Hypertension (IGH-IV, 2019) classify hypertension based on office BP readings taken on at least two separate visits, with the patient seated and rested for at least 5 minutes.
India carries approximately 20% of the global hypertension burden but only a fraction of patients are diagnosed, treated, and controlled. NFHS-5 (2019-21) found that 21% of women and 24% of men aged 15-49 had hypertension (≥140/90), but only 7% had BP under control. This treatment gap is the focus of the India Hypertension Control Initiative (IHCI), a programme jointly run by MoHFW, WHO, and ICMR which has enrolled over 1 crore patients since 2018.
| Category | Systolic (mmHg) | Diastolic (mmHg) |
|---|---|---|
| Optimal | < 120 | < 80 |
| Normal | 120-129 | 80-84 |
| High-Normal | 130-139 | 85-89 |
| Grade 1 (mild) | 140-159 | 90-99 |
| Grade 2 (moderate) | 160-179 | 100-109 |
| Grade 3 (severe) | ≥ 180 | ≥ 110 |
| Isolated Systolic Hypertension | ≥ 140 | < 90 |
Diagnosis requires elevated BP on at least 2 separate visits, 1-4 weeks apart. If BP is ≥180/110, diagnosis can be made on a single visit and treatment initiated immediately. Ambulatory BP Monitoring (ABPM) and Home BP Monitoring (HBPM) are recommended for suspected white-coat hypertension and masked hypertension.
Initial workup for newly diagnosed hypertension:
- Laboratory: CBC, serum creatinine, electrolytes (Na, K), fasting blood glucose, lipid profile, urinalysis (albumin/creatinine ratio), TSH if age < 40
- ECG: Look for LVH (Sokolow-Lyon criteria), strain pattern, arrhythmias, prior MI
- Echocardiography: If LVH suspected on ECG, or for target organ damage assessment
- Fundus examination: Keith-Wagener-Barker classification (Grade I-IV retinopathy)
- USG abdomen: If secondary hypertension suspected (renal artery stenosis, adrenal mass, polycystic kidneys)
Screen for secondary hypertension in: age < 30 without family history, resistant hypertension, sudden onset, hypokalaemia, abdominal bruit, episodic headache/palpitations/sweating (pheochromocytoma triad).
Target BP: < 140/90 mmHg for most adults; < 130/80 for diabetes, CKD, established CVD; < 150/90 for age ≥ 60 if tolerated.
Step 1: Single drug from one of four first-line classes:
- ACE inhibitor (Enalapril 5-20 mg BD, Ramipril 2.5-10 mg OD)
- ARB (Telmisartan 40-80 mg OD, Losartan 50-100 mg OD)
- Calcium channel blocker (Amlodipine 5-10 mg OD)
- Thiazide diuretic (Chlorthalidone 12.5-25 mg OD, Hydrochlorothiazide 12.5-25 mg OD)
Step 2: If BP uncontrolled after 4 weeks, add a second drug from a different class — preferably as a fixed-dose combination (FDC) tablet for adherence.
Step 3: Triple therapy — ACEI/ARB + CCB + diuretic
Step 4 (resistant hypertension): Add Spironolactone 25-50 mg OD (if eGFR > 30 and K+ < 4.5). If still uncontrolled, refer to specialist for evaluation of secondary causes.
Lifestyle modifications are essential adjuncts: DASH diet (low salt < 5 g/day, high fruits/vegetables), weight loss (target BMI 18.5-24.9), regular aerobic exercise (150 min/week), alcohol moderation, smoking cessation, stress management.
Defined as severe BP elevation (≥ 180/120) with acute target organ damage — hypertensive encephalopathy, intracerebral haemorrhage, acute coronary syndrome, acute pulmonary oedema, aortic dissection, eclampsia. Requires IV antihypertensive therapy in ICU setting:
- Nitroglycerine IV: For ACS, acute pulmonary oedema. Initial 5 mcg/min, titrate to BP
- Sodium nitroprusside IV: For hypertensive encephalopathy, aortic dissection. 0.25-10 mcg/kg/min
- Labetalol IV: For eclampsia, aortic dissection. 20 mg over 2 min, repeat q10min
- Hydralazine IV: For eclampsia. 5-10 mg slow IV
- Nicardipine IV: For most emergencies. 5-15 mg/hr
Goal: reduce BP by no more than 25% in the first hour, then to 160/100 over next 2-6 hours, then gradually to target over 24-48 hours. Rapid reduction can cause ischaemic stroke, MI, AKI.
Hypertension management is a daily reality for every Indian doctor — and the BP targets, drug ladder, and emergency management determine patient outcomes at scale. For UPSC CMS aspirants, IGH-IV classification and the IHCI protocol are highly testable clinical topics.