For Bp 110/70 , 95/ 70
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Make adult, 22 years, Feeling dizness as he stand or sit and feel more than 3 hour disapper when sleep or lie down
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Here is a clinical assessment of this case:
Clinical Picture: Orthostatic Hypotension (OH)
Patient: 22-year-old male
BP: 110/70 mmHg (baseline) → 95/70 mmHg (on standing/sitting)
Symptoms: Dizziness on standing or sitting, lasting >3 hours, resolves when supine
Diagnosis: Orthostatic Hypotension
Definition (Classical OH):
A sustained drop of SBP ≥20 mmHg or DBP ≥10 mmHg within 3 minutes of active standing.
In this patient:
- SBP drop: 110 → 95 = −15 mmHg (slightly below the classic 20 mmHg threshold)
- DBP: 70 → 70 = no change
This is a borderline/symptomatic variant of OH. Harrison's notes that "smaller but symptomatic reductions in SBP when the supine SBP is low (90–100 mmHg) but drops well below this level with standing" qualifies. The patient's baseline SBP of 110 is already low-normal, and the 15 mmHg drop with symptoms confirms the diagnosis clinically.
Why Symptoms Resolve on Lying Down
When supine, ~500–700 mL of blood that had pooled in the lower limbs and splanchnic bed is returned to central circulation, restoring cerebral perfusion → dizziness disappears. This is the hallmark positional pattern of OH.
The >3 hour duration while upright suggests poor autonomic compensation — the normal reflex (HR increase + vasoconstriction) is insufficient to maintain brain perfusion over time.
Possible Causes in a Young Adult
| Category | Examples |
|---|---|
| Hypovolemia | Dehydration, low salt/fluid intake |
| Deconditioning | Prolonged bed rest, sedentary lifestyle |
| Autonomic dysfunction | Early dysautonomia, POTS (Postural Orthostatic Tachycardia Syndrome) |
| Medications | Diuretics, alpha-blockers, antidepressants |
| Adrenal insufficiency | Addison's disease |
| Anemia | Reduced O₂ delivery |
| Cardiac | Low cardiac output |
POTS is especially common in young adults (particularly females 15–50 y) and presents similarly — check if HR rises >30 bpm on standing.
Management
Non-pharmacologic (first-line):
- Rise slowly — sit at bedside before standing
- Increase fluid intake: 2–2.5 L water/day
- Increase salt intake: 1–2 teaspoons/day or salt tablets
- Compression stockings (15–20 mmHg) or abdominal binder
- Small, frequent meals — avoid large carbohydrate loads
- Avoid hot environments, alcohol
- Physical countermaneuvers: leg crossing, squatting, calf-pumping
- Bolus water drinking (500 mL): raises BP within 5–10 minutes
Pharmacologic (if non-pharmacologic fails):
| Drug | Dose | Mechanism |
|---|---|---|
| Fludrocortisone | 0.1 mg/day | Expands intravascular volume (mineralocorticoid) |
| Midodrine | 5–10 mg TID | α₁-agonist → arterial + venous constriction |
| Droxidopa | 100–600 mg TID | Converted to norepinephrine → improves neurogenic OH |
Midodrine/Droxidopa should be taken before getting out of bed and not within 3–4 hours of bedtime to avoid supine hypertension.
Workup to Consider
- Lying and standing BP + HR (at 1, 3, 5 min) — confirm diagnosis, check for POTS
- CBC (anemia), electrolytes, renal function
- Cortisol/ACTH stimulation (rule out adrenal insufficiency)
- 24-hour urine sodium (assess volume status)
- ECG (rule out cardiac cause)
— Harrison's Principles of Internal Medicine 22E; Goldman-Cecil Medicine
Giving him glucose will help or not why this happing
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Will Glucose Help? No — and Here's Why
Short Answer: Glucose does NOT help orthostatic hypotension — it can actually make it worse.
Why This is Happening (The Mechanism)
When you stand or sit up, gravity pulls ~500–700 mL of blood into the leg veins and abdominal (splanchnic) vessels. Normally, the body fixes this automatically:
Standing → Blood pools in legs/abdomen
→ Venous return ↓ → Cardiac output ↓
→ Baroreceptors sense low BP
→ Sympathetic nervous system activates
→ Heart rate ↑ + blood vessels constrict
→ BP restored → Brain gets normal blood flow
In this patient, this reflex is insufficient — the compensation fails, BP drops from 110 → 95, blood flow to the brain falls, and the patient feels dizzy.
Why it resolves when lying down: Gravity is removed → blood flows back to the heart → cardiac output normalizes → brain perfusion restored. It's purely mechanical.
Why Glucose Makes It Worse, Not Better
This is a circulation problem, not a blood sugar problem.
| Issue | Explanation |
|---|---|
| Root cause | Blood is pooling in the wrong place (legs/abdomen) |
| Glucose does nothing | It doesn't increase blood volume, doesn't constrict vessels, doesn't improve cardiac output |
| Glucose (especially sugary foods) can worsen it | Eating carbohydrates triggers insulin release → insulin causes splanchnic vasodilation (blood vessels in the abdomen widen) → even MORE blood pools in the abdomen → BP drops further |
Goldman-Cecil Medicine explicitly states:
"Many patients have postprandial hypotension within 2 hours after a meal because of insulin-triggered splanchnic vasodilation."
So giving this patient a sugary drink or glucose after standing-induced dizziness could prolong or deepen the BP drop.
What Actually Helps (Correct Immediate Treatment)
| Intervention | Why It Works |
|---|---|
| Lie down | Restores venous return immediately |
| Drink 500 mL of water (bolus) | Triggers a sympathetic reflex via portal osmoreceptors → BP rises within 5–10 minutes |
| Eat small, low-carb meals | Reduces insulin-triggered vasodilation |
| Salt intake ↑ | Increases plasma volume → more blood in circulation |
| Compression stockings | Physically prevents blood from pooling in legs |
The Key Teaching Point
Orthostatic hypotension is a blood distribution problem, not a fuel problem.
- Glucose treats hypoglycemia (low blood sugar → brain has no fuel)
- This patient has adequate blood sugar — his brain lacks blood flow, not glucose
Confusing the two is a common mistake. The correct emergency measure is lying flat + drinking water, not glucose.
— Goldman-Cecil Medicine; Braunwald's Heart Disease; Harrison's Principles of Internal Medicine 22E
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Here is a full step-by-step explanation of how the autonomic nervous system (ANS) works in this situation:
The Autonomic Nervous System & Orthostatic Hypotension — Full Explanation
1. What is the Autonomic Nervous System (ANS)?
The ANS is the automatic control system of the body — it runs in the background without conscious thought. It has two opposing divisions:
| Division | Function |
|---|---|
| Sympathetic ("fight or flight") | Speeds heart, constricts vessels, raises BP |
| Parasympathetic ("rest and digest") | Slows heart, relaxes vessels, lowers BP |
These two constantly balance each other to keep blood pressure stable.
2. What Normally Happens When You Stand Up
You stand up
↓
Gravity pulls ~500–700 mL of blood DOWN into leg veins and belly vessels
↓
Less blood returns to the heart (↓ venous return)
↓
Heart pumps less blood per beat (↓ cardiac output)
↓
Blood pressure drops momentarily
The body detects this within milliseconds using baroreceptors — pressure sensors located in:
- The carotid sinus (in your neck)
- The aortic arch (at the top of the heart)
3. The Baroreceptor Reflex — The Body's Emergency Fix
When baroreceptors sense the drop in pressure, they send a signal to the brainstem (specifically the nucleus tractus solitarius and the ventrolateral medulla):
Baroreceptors sense ↓ BP
↓
Signal sent to brainstem
↓
Brainstem does TWO things simultaneously:
├── Suppresses parasympathetic (withdraws "braking" on the heart)
└── Activates sympathetic nervous system
The sympathetic activation then does three things:
| Action | Effect |
|---|---|
| ↑ Heart rate | More beats per minute → more output |
| ↑ Heart contraction strength | Each beat pumps more blood |
| Blood vessel constriction (vasoconstriction) | Squeezes blood from limbs back toward brain |
Result in a healthy person: BP is fully restored within 15–30 seconds of standing. No dizziness.
4. What Is Failing in This Patient
In this 22-year-old, the sympathetic compensatory response is too weak or too slow. The baroreceptor reflex fires, but the correction is incomplete:
Stands up
↓
Blood pools in legs → BP drops 110 → 95 mmHg
↓
Baroreceptors send the signal ✓
↓
Sympathetic activates... but INSUFFICIENT response
↓
Heart rate doesn't rise enough / vessels don't constrict enough
↓
Brain gets less blood → DIZZINESS
The brain is the most sensitive organ to blood flow — even a small drop causes lightheadedness immediately.
5. Why It Lasts 3+ Hours Standing
Normally, muscles in the legs pump blood upward during movement (the "skeletal muscle pump"). But if the person is standing still for hours, this pump is inactive → blood continues to pool → the weak sympathetic system cannot maintain adequate pressure for that long → dizziness persists.
6. Why It Disappears When Lying Down
Patient lies down
↓
Gravity no longer pulls blood into legs
↓
Blood returns to the heart naturally (gravity-assisted)
↓
Cardiac output restores ✓
↓
Brain gets full blood flow → Dizziness gone
No ANS action needed — it resolves purely mechanically.
7. Why Glucose Does Nothing
Glucose feeds cells. But this patient's cells are not starved — they are not getting enough blood to arrive in the first place. Giving glucose is like sending food to a delivery truck that is stuck in traffic — the problem is not the food, it is the route.
The correct "fix" is to get blood moving back toward the brain — that is a circulation and ANS problem, solved by:
- Water (triggers a sympathetic reflex from the gut → raises BP)
- Salt (increases blood volume → more blood to fill the system)
- Compression stockings (physical prevention of leg pooling)
- Lying flat (removes gravity from the equation)
Summary Diagram
STANDING
│
▼
Blood pools in legs
│
▼
↓ Venous return → ↓ Cardiac output → ↓ BP
│
▼
Baroreceptors (carotid sinus, aortic arch) detect drop
│
▼
Brainstem (medulla) activates SYMPATHETIC system
│
├──→ ↑ Heart rate
├──→ ↑ Heart contraction
└──→ ↑ Vasoconstriction
│
▼
BP restored ✓ (healthy person)
BP NOT restored ✗ (this patient → dizziness)
— Kandel's Principles of Neural Science, 6th Ed.; Costanzo Physiology, 7th Ed.; Goldman-Cecil Medicine
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