**Question:** An old man with hypertension and BP 210/110 mm Hg is classified into Severe hypertension. Scale used is:

A. Severe Hypertension (240/130 mm Hg)
B. Stage 3 Hypertension (180-199/100-109 mm Hg)
C. Stage 4 Hypertension (240/130 mm Hg)
D. Severe Hypertension (240/130 mm Hg)

**Correct Answer:** D. Severe Hypertension (240/130 mm Hg)

**Core Concept:**
Hypertension is classified based on the blood pressure values and the severity of the condition. The scale used for classifying hypertension into stages is essential for determining the appropriate treatment approach and monitoring the patient's response to therapy.

Hypertension is classified into four stages:

1. Stage 1 Hypertension: Systolic BP (SBP) 140-159 mm Hg or Diastolic BP (DBP) 90-99 mm Hg
2. Stage 2 Hypertension: SBP 160-179 mm Hg or DBP 100-109 mm Hg
3. Stage 3 Hypertension: SBP 180-189 mm Hg or DBP 110-119 mm Hg
4. Severe Hypertension: SBP ≥ 190 mm Hg or DBP ≥ 120 mm Hg

**Why the Correct Answer is Right:**

In this question, we are discussing a patient with a blood pressure reading of 210/110 mm Hg. The correct classification for this patient falls under Severe Hypertension, as the patient has a SBP of 210 mm Hg, which is above the SBP threshold for Severe Hypertension (190 mm Hg).

**Why Each Wrong Option is Incorrect:**

A. Severe Hypertension (240/130 mm Hg) - This option is incorrect as the patient's blood pressure falls short of the severe hypertension classification (SBP ≥ 190 mm Hg).
B. Stage 3 Hypertension (180-189 mm Hg or 110-119 mm Hg) - This option is incorrect as the patient's blood pressure is above the threshold for Stage 3 Hypertension (SBP ≥ 180 mm Hg or DBP ≥ 110 mm Hg).
C. Stage 4 Hypertension (SBP ≥ 190 mm Hg or DBP ≥ 120 mm Hg) - This option is incorrect as the patient's blood pressure falls within the severe hypertension classification (SBP ≥ 190 mm Hg).
D. Severe Hypertension (SBP ≥ 190 mm Hg or DBP ≥ 120 mm Hg) - This