A 65 yr old female have bp 145/82 as normal but after giving 5 mg Amlo

A 65 yr old female have bp 145/82 as normal but after giving 5 mg Amlodipine and 40mg telmisatan the bp goes to 132/ 76 why does systolic pressure reduces below normal

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This is a great clinical question. The short answer is: 132/76 mmHg is not below normal — it is actually the treatment target. Here's the full explanation:

Why Did the BP Drop to 132/76 After Amlodipine + Telmisartan?

1. The Starting BP Was Already in the "Hypertensive" Range

A BP of 145/82 mmHg in a 65-year-old woman is not normal — it is Stage 1–2 hypertension. For adults ≥65 years, current guidelines recommend a target SBP <130–140 mmHg. So the "normal" baseline she had before treatment was actually an undertreated hypertensive reading.

2. How Each Drug Lowered the Systolic Pressure

Amlodipine (5 mg) — Dihydropyridine Calcium Channel Blocker (CCB)

Blocks L-type voltage-gated calcium channels in vascular smooth muscle
Reduces intracellular Ca²⁺ → smooth muscle relaxation → peripheral vasodilation
Predominantly reduces systemic vascular resistance (SVR)
Because SBP = Cardiac Output × SVR (simplified), a drop in SVR directly pulls down systolic pressure
Amlodipine preferentially acts on peripheral arterioles, making it especially effective at reducing systolic BP

Telmisartan (40 mg) — Angiotensin II Receptor Blocker (ARB)

Blocks AT₁ receptors → prevents angiotensin II from causing vasoconstriction and aldosterone release
Reduces both vasoconstriction and sodium/water retention → decreases both preload and afterload
Also lowers SVR, contributing to systolic pressure reduction
In elderly patients, the renin-angiotensin-aldosterone system (RAAS) often plays a significant role in maintaining elevated BP — blocking it produces reliable systolic reductions

Combined Effect: These two drugs attack BP via two complementary mechanisms (direct vasodilation + RAAS blockade), so their combined effect is additive and often synergistic.

3. Why Systolic Drops More Than Diastolic in Elderly Patients

In patients over 60, isolated systolic hypertension is the most common pattern. This occurs because:

Aging causes aortic and large artery stiffening → reduced vascular capacitance → elevated pulse wave velocity
SBP keeps rising with age while DBP often falls after age 50
Drugs like amlodipine (which relax arterial walls) are particularly effective at reducing this stiffness-driven systolic elevation

So the systolic fell from 145 → 132 (a 13 mmHg drop) while diastolic fell only 6 mmHg (82 → 76), which is the expected pattern with these agents.

— Comprehensive Clinical Nephrology, 7th Edition, p. 492–493

4. Is 132/76 "Below Normal"?

No. The confusion arises from redefining what "normal" means:

Classification	SBP	DBP
Normal (ACC/AHA 2017)	<120	<80
Elevated	120–129	<80
Stage 1 HTN	130–139	80–89
Stage 2 HTN	≥140	≥90

A BP of 132/76 mmHg is Stage 1 hypertension — still above the ideal, but a significant improvement and within acceptable treatment targets for a 65-year-old (target SBP <130–140 mmHg depending on guidelines used).

There is no risk of hypotension at this level unless the patient is symptomatic (dizziness, syncope). The diastolic of 76 mmHg is safe and well above the J-curve threshold (~60–70 mmHg DBP) that would increase risk of cardiac ischemia.

Summary

Factor	Explanation
145/82 was not "normal"	It was mild hypertension requiring treatment
Amlodipine	Reduces SVR via Ca²⁺ channel blockade → drops SBP
Telmisartan	Blocks RAAS → reduces vasoconstriction + fluid retention → drops SBP
Combined effect	Additive/synergistic systolic reduction
Systolic drops more	Due to arterial stiffness in the elderly — both drugs directly address this
132/76 is the goal	Not below normal; it's the target treatment range

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