Cardiovascular atlas ↗Pressure stretches sensors
Carotid-sinus and aortic-arch baroreceptors encode arterial stretch and relay it to the brainstem.
CARDIOVASCULAR / PRESSURE
Pressure is an output,
not a single switch.
Arterial pressure emerges from cardiac output, vascular resistance, arterial properties, blood volume, kidney sodium handling, hormones, nerves, endothelium, and context. This map separates fast reflexes from slow volume regulation.
12-STAGE CONTROL MAP
Beat-to-beat control
meets kidney time.
A useful simplification is mean arterial pressure ≈ cardiac output × systemic vascular resistance, but pulsatility, arterial stiffness, wave reflection, posture, measurement conditions, and organ autoregulation also matter.
Autonomic response
Sympathetic and parasympathetic output adjusts heart rate, contractility, venous tone, and arteriolar tone.
Cardiac output changes
Rate and stroke volume alter blood delivered per minute.
Resistance redistributes flow
Arteriolar diameter changes systemic resistance while local tissues retain autoregulatory control.
Kidney senses perfusion
Renal perfusion, tubular sodium delivery, and sympathetic signals influence renin release.
RAAS activates
Renin generates angiotensin signaling; angiotensin II supports vasoconstriction and aldosterone release.
Sodium and water shift
Aldosterone, ADH, thirst, and natriuretic peptides influence retained salt and water.
Volume changes venous return
Extracellular volume affects filling pressure, stroke volume, and pressure, with congestion if compensation overshoots.
Nitric oxide relaxes
Endothelial NO activates smooth-muscle relaxation and helps match local flow to demand.
Endothelin constricts
Endothelin and other mediators can favor vasoconstriction; balance is local and context dependent.
Arteries remodel
Persistent load can produce wall thickening and stiffness, raising systolic load and pulse pressure.
Target organs accumulate injury
Chronic hypertension increases risk across brain, heart, kidneys, retina, and arteries even when symptoms are absent.
TREATMENT SITES
Different classes,
different control points.
Class choice and combinations depend on the clinical situation, other conditions, labs, pregnancy potential, adverse effects, and measured response.
ACE inhibitors / ARBs
Reduce angiotensin signaling; monitoring can include kidney function and potassium.
Diuretics
Promote sodium excretion and lower volume/pressure; electrolyte and metabolic effects vary by class.
Calcium-channel blockers
Selected drugs reduce vascular smooth-muscle contraction; edema and other effects vary.
Beta blockers
Lower selected sympathetic effects and are especially useful for particular cardiac indications.
Foundational modifiers
Sodium pattern, dietary quality, alcohol, activity, sleep, weight, tobacco, and medication adherence can influence pressure.
Confirm the signal
Validated cuff, correct size, rest, repeated readings, and out-of-office values help distinguish sustained pressure from noise.
Current guidance: 2025 AHA/ACC High Blood Pressure Guideline ↗ · Endothelial function review ↗
This model cannot diagnose hypertension or recommend an individual target. A hypertensive emergency is a clinical assessment, not a map state.