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Fluids
Fluids are a drug — indication, dose, stop point.
NS causes hyperchloremic metabolic acidosis in large doses.
Balanced crystalloids reduce AKI vs NS.
RL does NOT worsen lactic acidosis.
D5W becomes hypotonic after metabolism → never for shock.
3% NaCl pulls water from ICF → ↓ cerebral oedema.
Only 250 mL of 1 L NS stays intravascular (1/4th).
D5W is IV free water — used for hypernatremia.
Fluids >3–4 L without reassessment worsens mortality.
Fluid responsiveness > fluid bolus habit.
PLR replaces trial bolus — if no rise, stop fluids.
CVP does not predict fluid responsiveness.
CVP reflects right-sided filling pressure.
High CVP + low urine output = volume overload, not hypovolemia.
Low urine output with a high CVP = kidneys are congested
GFR depends on perfusion pressure (MAP – renal vein pressure)
RPP (Renal perfusion pressure) = MAP – CVP (renal venous pressure)
Blood loss → blood products, not crystalloids.
Post-op patients need low maintenance, not resuscitation fluids.
Fluids during shock must never be “maintenance fluids.”
Restrictive fluids + early vasopressors is modern sepsis practice.
Fluids without source control never fix septic shock.
⚡ Electrolytes
Potassium correction fails until magnesium corrected.
Hypokalemia + hypocalcemia + hypomagnesemia → think alcohol/PPIs/aminoglycosides.
Hyperkalemia on ECG without symptoms is still an emergency.
Calcium should be corrected only after magnesium when both low.
Severe hyperphosphatemia → hypocalcemia due to precipitation.
Severe hypercalcemia (>13) is malignancy until proved otherwise.
Hyperkalemia with muscle weakness → treat BEFORE waiting for ECG.
Shift potassium into cells: insulin, β2 agonists, bicarbonate (if acidosis).
Remove potassium from body: diuretics, resins, dialysis.
Hyperkalemia in DKA improves with insulin long before potassium leaves body.
Na correction must not exceed 8–10 mmol/L/day.
Hypovolemic hyponatremia is treated with NS, not 3%.
Symptomatic hyponatremia requires 3% saline bolus.
Hypernatremia correction too fast → cerebral edema.
Hypokalemia causes metabolic alkalosis (via H⁺ secretion).
Hyperkalemia causes metabolic acidosis (via H⁺ retention).
Hypophosphatemia causes respiratory muscle weakness.
Hyperphosphatemia suggests renal failure or tumor lysis.
Hypomagnesemia causes refractory arrhythmias.
Magnesium toxicity causes hypotension + bradycardia + respiratory depression.
💉 Hemodynamics / Shock
MAP is NOT perfusion; flow is.
Shock can exist with normal or high BP.
Lactate reflects perfusion + oxygen debt, not just sepsis.
Pressors without fluids in hypovolemia worsen ischemia.
Fluids without responsiveness worsen mortality.
Norepinephrine is first line in septic shock.
Vasopressin is add-on, not first-line.
Dobutamine treats pump failure, not BP.
If dobutamine drops BP → add NE, don’t stop dobutamine.
Cardiogenic shock + vasodilation → NE + dobutamine together.
Brady shock without pacing → epinephrine.
Dopamine has highest arrhythmia risk.
Lactate rise soon after NE = reperfusion, not worsening.
Persistent high lactate after 6–12h = ongoing shock.
Vasopressors fail in severe acidosis; vasopressin still works.
Cold mottled extremities = poor flow despite MAP.
High CVP + low urine output = stop fluids → pressors.
De-resuscitation (diuresis) improves survival once stable.
💧 Osmotic Equilibrium
Water follows tonicity, not osmolarity.
Sodium is the primary determinant of ECF osmolality.
Urea increases osmolarity but not tonicity.
Hyperosmolar states pull water out of brain → ↓ ICP.
Hypotonic infusion forces water into cells → brain swelling.
Hypertonic saline ↓ ICP faster than mannitol in some settings.
D5W worsens ICP — contraindicated in neuro injury.
Hyperglycemia causes hyponatremia via osmotic shift.
Mannitol can cause rebound cerebral edema if kidney failure develops.
⚡ Electric (ionic) Equilibrium
Na⁺ governs volume; K⁺ governs electrophysiology.
Small change in potassium = massive electrophysiologic effect.
K⁺ shifts are more dangerous than K⁺ deficits/excess.
Aldosterone → Na⁺ reabsorption, K⁺ secretion.
Hyperkalemia suppresses myocardial conduction.
Hypokalemia increases risk of digoxin toxicity.
Acidosis shifts K⁺ out of cells.
β2 stimulation shifts K⁺ into cells.
Digitalis toxicity causes hyperkalemia from pump inhibition.
Hypocalcemia prolongs QT; hypercalcemia shortens QT.
Low magnesium → low K⁺ + low Ca²⁺ + refractory arrhythmias.
🔥 Acid–Base Equilibrium
pH < 7.10 → catecholamines fail → vasopressin indicated.
High lactate = oxygen debt until proven otherwise.
Normal pH does NOT exclude acidosis (mixed disorders).
Chloride ↑ → bicarbonate ↓ (electroneutrality).
Metabolic alkalosis is chloride deficit until proven otherwise.
Urine chloride <10 = saline responsive alkalosis (vomiting/post-diuretics).
Urine chloride >20 = mineralocorticoid excess alkalosis.
Anion gap metabolic acidosis = unmeasured acids present.
Delta gap identifies mixed disorders.
Respiratory compensation never normalizes pH.
If pCO₂ and HCO₃ move in same direction → compensation.
If pCO₂ and HCO₃ move opposite → mixed disorder.
Hyperchloremia = acidosis; hypochloremia = alkalosis.
Sodium bicarbonate helps only in extreme acidemia impairing perfusion.
In DKA: acidosis improves by closing the gap, not raising pH.
Lactate clearance correlates with survival.
🩺 Oxygen Delivery Integration
Perfusion must match oxygenation.
Low SpO₂ but good BP = still shock if DO₂ poor.
Hb < 7 g/dL → transfuse if shock persists.
ScvO₂ < 70% → inadequate oxygen delivery.
Shock cannot be reversed without addressing oxygen debt.
Rising urine output = best early sign of adequate perfusion.
Falling lactate = strongest biochemical sign of shock reversal.
🧠 Master integration rule
Fluids increase preload; pressors increase afterload; inotropes increase contractility; oxygen/Hb improve DO₂; acid–base fixes drug responsiveness.
Any shock is fixed by targeting the failing component — not treating all components blindly.
🚰 Fluids
Fluids are a drug — indication, dose, stop point.
NS causes hyperchloremic metabolic acidosis in large doses.
Balanced crystalloids reduce AKI vs NS.
RL does NOT worsen lactic acidosis.
D5W becomes hypotonic after metabolism → never for shock.
3% NaCl pulls water from ICF → ↓ cerebral edema.
Only 250 mL of 1 L NS stays intravascular.
D5W is IV free water — used for hypernatremia.
Burns need RL (Parkland formula), not NS.
Albumin is indicated in cirrhosis/HRS/SBP, not routine ICU resus.
Fluids >3–4 L without reassessment worsens mortality.
Fluid responsiveness > fluid bolus habit.
PLR replaces trial bolus — if no rise, stop fluids.
CVP does not predict fluid responsiveness.
High CVP + low urine output = volume overload, not hypovolemia.
Blood loss → blood products, not crystalloids.
Post-op patients need low maintenance, not resuscitation fluids.
Fluids during shock must never be “maintenance fluids.”
Restrictive fluids + early vasopressors is modern sepsis practice.
Fluids without source control never fix septic shock.
⚡ Electrolytes
Potassium correction fails until magnesium corrected.
Hypokalemia + hypocalcemia + hypomagnesemia → think alcohol/PPIs/aminoglycosides.
Hyperkalemia on ECG without symptoms is still an emergency.
Calcium should be corrected only after magnesium when both low.
Severe hyperphosphatemia → hypocalcemia due to precipitation.
Severe hypercalcemia (>13) is malignancy until proved otherwise.
Hyperkalemia with muscle weakness → treat BEFORE waiting for ECG.
Shift potassium into cells: insulin, β2 agonists, bicarbonate (if acidosis).
Remove potassium from body: diuretics, resins, dialysis.
Hyperkalemia in DKA improves with insulin long before potassium leaves body.
Na correction must not exceed 8–10 mmol/L/day.
Hypovolemic hyponatremia is treated with NS, not 3%.
Symptomatic hyponatremia requires 3% saline bolus.
Hypernatremia correction too fast → cerebral edema.
Hypokalemia causes metabolic alkalosis (via H⁺ secretion).
Hyperkalemia causes metabolic acidosis (via H⁺ retention).
Hypophosphatemia causes respiratory muscle weakness.
Hyperphosphatemia suggests renal failure or tumor lysis.
Hypomagnesemia causes refractory arrhythmias.
Magnesium toxicity causes hypotension + bradycardia + respiratory depression.
💉 Hemodynamics / Shock
MAP is NOT perfusion; flow is.
Shock can exist with normal or high BP.
Lactate reflects perfusion + oxygen debt, not just sepsis.
Pressors without fluids in hypovolemia worsen ischemia.
Fluids without responsiveness worsen mortality.
Norepinephrine is first line in septic shock.
Vasopressin is add-on, not first-line.
Dobutamine treats pump failure, not BP.
If dobutamine drops BP → add NE, don’t stop dobutamine.
Cardiogenic shock + vasodilation → NE + dobutamine together.
Brady shock without pacing → epinephrine.
Dopamine has highest arrhythmia risk.
Lactate rise soon after NE = reperfusion, not worsening.
Persistent high lactate after 6–12h = ongoing shock.
Vasopressors fail in severe acidosis; vasopressin still works.
Cold mottled extremities = poor flow despite MAP.
High CVP + low urine output = stop fluids → pressors.
De-resuscitation (diuresis) improves survival once stable.
💧 Osmotic Equilibrium
Water follows tonicity, not osmolarity.
Sodium is the primary determinant of ECF osmolality.
Urea increases osmolarity but not tonicity.
Hyperosmolar states pull water out of brain → ↓ ICP.
Hypotonic infusion forces water into cells → brain swelling.
Hypertonic saline ↓ ICP faster than mannitol in some settings.
D5W worsens ICP — contraindicated in neuro injury.
Hyperglycemia causes hyponatremia via osmotic shift.
Mannitol can cause rebound cerebral edema if kidney failure develops.
⚡ Electric (ionic) Equilibrium
Na⁺ governs volume; K⁺ governs electrophysiology.
Small change in potassium = massive electrophysiologic effect.
K⁺ shifts are more dangerous than K⁺ deficits/excess.
Aldosterone → Na⁺ reabsorption, K⁺ secretion.
Hyperkalemia suppresses myocardial conduction.
Hypokalemia increases risk of digoxin toxicity.
Acidosis shifts K⁺ out of cells.
β2 stimulation shifts K⁺ into cells.
Digitalis toxicity causes hyperkalemia from pump inhibition.
Hypocalcemia prolongs QT; hypercalcemia shortens QT.
Low magnesium → low K⁺ + low Ca²⁺ + refractory arrhythmias.
🔥 Acid–Base Equilibrium
pH < 7.10 → catecholamines fail → vasopressin indicated.
High lactate = oxygen debt until proven otherwise.
Normal pH does NOT exclude acidosis (mixed disorders).
Chloride ↑ → bicarbonate ↓ (electroneutrality).
Metabolic alkalosis is chloride deficit until proven otherwise.
Urine chloride <10 = saline responsive alkalosis (vomiting/post-diuretics).
Urine chloride >20 = mineralocorticoid excess alkalosis.
Anion gap metabolic acidosis = unmeasured acids present.
Delta gap identifies mixed disorders.
Respiratory compensation never normalizes pH.
If pCO₂ and HCO₃ move in same direction → compensation.
If pCO₂ and HCO₃ move opposite → mixed disorder.
Hyperchloremia = acidosis; hypochloremia = alkalosis.
Sodium bicarbonate helps only in extreme acidemia impairing perfusion.
In DKA: acidosis improves by closing the gap, not raising pH.
Lactate clearance correlates with survival.
🩺 Oxygen Delivery Integration
Perfusion must match oxygenation.
Low SpO₂ but good BP = still shock if DO₂ poor.
Hb < 7 g/dL → transfuse if shock persists.
ScvO₂ < 70% → inadequate oxygen delivery.
Shock cannot be reversed without addressing oxygen debt.
Rising urine output = best early sign of adequate perfusion.
Falling lactate = strongest biochemical sign of shock reversal.
🧠 Master integration rule
Fluids increase preload; pressors increase afterload; inotropes increase contractility; oxygen/Hb improve DO₂; acid–base fixes drug responsiveness.
Any shock is fixed by targeting the failing component — not treating all components blindly.
🚰 Fluids
Fluids are a drug — indication, dose, stop point.
NS causes hyperchloremic metabolic acidosis in large doses.
Balanced crystalloids reduce AKI vs NS.
RL does NOT worsen lactic acidosis.
D5W becomes hypotonic after metabolism → never for shock.
3% NaCl pulls water from ICF → ↓ cerebral edema.
Only 250 mL of 1 L NS stays intravascular.
D5W is IV free water — used for hypernatremia.
Burns need RL (Parkland formula), not NS.
Albumin is indicated in cirrhosis/HRS/SBP, not routine ICU resus.
Fluids >3–4 L without reassessment worsens mortality.
Fluid responsiveness > fluid bolus habit.
PLR replaces trial bolus — if no rise, stop fluids.
CVP does not predict fluid responsiveness.
High CVP + low urine output = volume overload, not hypovolemia.
Blood loss → blood products, not crystalloids.
Post-op patients need low maintenance, not resuscitation fluids.
Fluids during shock must never be “maintenance fluids.”
Restrictive fluids + early vasopressors is modern sepsis practice.
Fluids without source control never fix septic shock.
⚡ Electrolytes
Potassium correction fails until magnesium corrected.
Hypokalemia + hypocalcemia + hypomagnesemia → think alcohol/PPIs/aminoglycosides.
Hyperkalemia on ECG without symptoms is still an emergency.
Calcium should be corrected only after magnesium when both low.
Severe hyperphosphatemia → hypocalcemia due to precipitation.
Severe hypercalcemia (>13) is malignancy until proved otherwise.
Hyperkalemia with muscle weakness → treat BEFORE waiting for ECG.
Shift potassium into cells: insulin, β2 agonists, bicarbonate (if acidosis).
Remove potassium from body: diuretics, resins, dialysis.
Hyperkalemia in DKA improves with insulin long before potassium leaves body.
Na correction must not exceed 8–10 mmol/L/day.
Hypovolemic hyponatremia is treated with NS, not 3%.
Symptomatic hyponatremia requires 3% saline bolus.
Hypernatremia correction too fast → cerebral edema.
Hypokalemia causes metabolic alkalosis (via H⁺ secretion).
Hyperkalemia causes metabolic acidosis (via H⁺ retention).
Hypophosphatemia causes respiratory muscle weakness.
Hyperphosphatemia suggests renal failure or tumor lysis.
Hypomagnesemia causes refractory arrhythmias.
Magnesium toxicity causes hypotension + bradycardia + respiratory depression.
💉 Hemodynamics / Shock
MAP is NOT perfusion; flow is.
Shock can exist with normal or high BP.
Lactate reflects perfusion + oxygen debt, not just sepsis.
Pressors without fluids in hypovolemia worsen ischemia.
Fluids without responsiveness worsen mortality.
Norepinephrine is first line in septic shock.
Vasopressin is add-on, not first-line.
Dobutamine treats pump failure, not BP.
If dobutamine drops BP → add NE, don’t stop dobutamine.
Cardiogenic shock + vasodilation → NE + dobutamine together.
Brady shock without pacing → epinephrine.
Dopamine has highest arrhythmia risk.
Lactate rise soon after NE = reperfusion, not worsening.
Persistent high lactate after 6–12h = ongoing shock.
Vasopressors fail in severe acidosis; vasopressin still works.
Cold mottled extremities = poor flow despite MAP.
High CVP + low urine output = stop fluids → pressors.
De-resuscitation (diuresis) improves survival once stable.
💧 Osmotic Equilibrium
Water follows tonicity, not osmolarity.
Sodium is the primary determinant of ECF osmolality.
Urea increases osmolarity but not tonicity.
Hyperosmolar states pull water out of brain → ↓ ICP.
Hypotonic infusion forces water into cells → brain swelling.
Hypertonic saline ↓ ICP faster than mannitol in some settings.
D5W worsens ICP — contraindicated in neuro injury.
Hyperglycemia causes hyponatremia via osmotic shift.
Mannitol can cause rebound cerebral edema if kidney failure develops.
⚡ Electric (ionic) Equilibrium
Na⁺ governs volume; K⁺ governs electrophysiology.
Small change in potassium = massive electrophysiologic effect.
K⁺ shifts are more dangerous than K⁺ deficits/excess.
Aldosterone → Na⁺ reabsorption, K⁺ secretion.
Hyperkalemia suppresses myocardial conduction.
Hypokalemia increases risk of digoxin toxicity.
Acidosis shifts K⁺ out of cells.
β2 stimulation shifts K⁺ into cells.
Digitalis toxicity causes hyperkalemia from pump inhibition.
Hypocalcemia prolongs QT; hypercalcemia shortens QT.
Low magnesium → low K⁺ + low Ca²⁺ + refractory arrhythmias.
🔥 Acid–Base Equilibrium
pH < 7.10 → catecholamines fail → vasopressin indicated.
High lactate = oxygen debt until proven otherwise.
Normal pH does NOT exclude acidosis (mixed disorders).
Chloride ↑ → bicarbonate ↓ (electroneutrality).
Metabolic alkalosis is chloride deficit until proven otherwise.
Urine chloride <10 = saline responsive alkalosis (vomiting/post-diuretics).
Urine chloride >20 = mineralocorticoid excess alkalosis.
Anion gap metabolic acidosis = unmeasured acids present.
Delta gap identifies mixed disorders.
Respiratory compensation never normalizes pH.
If pCO₂ and HCO₃ move in same direction → compensation.
If pCO₂ and HCO₃ move opposite → mixed disorder.
Hyperchloremia = acidosis; hypochloremia = alkalosis.
Sodium bicarbonate helps only in extreme acidemia impairing perfusion.
In DKA: acidosis improves by closing the gap, not raising pH.
Lactate clearance correlates with survival.
🩺 Oxygen Delivery Integration
Perfusion must match oxygenation.
Low SpO₂ but good BP = still shock if DO₂ poor.
Hb < 7 g/dL → transfuse if shock persists.
ScvO₂ < 70% → inadequate oxygen delivery.
Shock cannot be reversed without addressing oxygen debt.
Rising urine output = best early sign of adequate perfusion.
Falling lactate = strongest biochemical sign of shock reversal.
🧠 Master integration rule
Fluids increase preload; pressors increase afterload; inotropes increase contractility; oxygen/Hb improve DO₂; acid–base fixes drug responsiveness.
Any shock is fixed by targeting the failing component — not treating all components blindly.
🚰 Fluids
Fluids are a drug — indication, dose, stop point.
NS causes hyperchloremic metabolic acidosis in large doses.
Balanced crystalloids reduce AKI vs NS.
RL does NOT worsen lactic acidosis.
D5W becomes hypotonic after metabolism → never for shock.
3% NaCl pulls water from ICF → ↓ cerebral edema.
Only 250 mL of 1 L NS stays intravascular.
D5W is IV free water — used for hypernatremia.
Burns need RL (Parkland formula), not NS.
Albumin is indicated in cirrhosis/HRS/SBP, not routine ICU resus.
Fluids >3–4 L without reassessment worsens mortality.
Fluid responsiveness > fluid bolus habit.
PLR replaces trial bolus — if no rise, stop fluids.
CVP does not predict fluid responsiveness.
High CVP + low urine output = volume overload, not hypovolemia.
Blood loss → blood products, not crystalloids.
Post-op patients need low maintenance, not resuscitation fluids.
Fluids during shock must never be “maintenance fluids.”
Restrictive fluids + early vasopressors is modern sepsis practice.
Fluids without source control never fix septic shock.
⚡ Electrolytes
Potassium correction fails until magnesium corrected.
Hypokalemia + hypocalcemia + hypomagnesemia → think alcohol/PPIs/aminoglycosides.
Hyperkalemia on ECG without symptoms is still an emergency.
Calcium should be corrected only after magnesium when both low.
Severe hyperphosphatemia → hypocalcemia due to precipitation.
Severe hypercalcemia (>13) is malignancy until proved otherwise.
Hyperkalemia with muscle weakness → treat BEFORE waiting for ECG.
Shift potassium into cells: insulin, β2 agonists, bicarbonate (if acidosis).
Remove potassium from body: diuretics, resins, dialysis.
Hyperkalemia in DKA improves with insulin long before potassium leaves body.
Na correction must not exceed 8–10 mmol/L/day.
Hypovolemic hyponatremia is treated with NS, not 3%.
Symptomatic hyponatremia requires 3% saline bolus.
Hypernatremia correction too fast → cerebral edema.
Hypokalemia causes metabolic alkalosis (via H⁺ secretion).
Hyperkalemia causes metabolic acidosis (via H⁺ retention).
Hypophosphatemia causes respiratory muscle weakness.
Hyperphosphatemia suggests renal failure or tumor lysis.
Hypomagnesemia causes refractory arrhythmias.
Magnesium toxicity causes hypotension + bradycardia + respiratory depression.
💉 Hemodynamics / Shock
MAP is NOT perfusion; flow is.
Shock can exist with normal or high BP.
Lactate reflects perfusion + oxygen debt, not just sepsis.
Pressors without fluids in hypovolemia worsen ischemia.
Fluids without responsiveness worsen mortality.
Norepinephrine is first line in septic shock.
Vasopressin is add-on, not first-line.
Dobutamine treats pump failure, not BP.
If dobutamine drops BP → add NE, don’t stop dobutamine.
Cardiogenic shock + vasodilation → NE + dobutamine together.
Brady shock without pacing → epinephrine.
Dopamine has highest arrhythmia risk.
Lactate rise soon after NE = reperfusion, not worsening.
Persistent high lactate after 6–12h = ongoing shock.
Vasopressors fail in severe acidosis; vasopressin still works.
Cold mottled extremities = poor flow despite MAP.
High CVP + low urine output = stop fluids → pressors.
De-resuscitation (diuresis) improves survival once stable.
💧 Osmotic Equilibrium
Water follows tonicity, not osmolarity.
Sodium is the primary determinant of ECF osmolality.
Urea increases osmolarity but not tonicity.
Hyperosmolar states pull water out of brain → ↓ ICP.
Hypotonic infusion forces water into cells → brain swelling.
Hypertonic saline ↓ ICP faster than mannitol in some settings.
D5W worsens ICP — contraindicated in neuro injury.
Hyperglycemia causes hyponatremia via osmotic shift.
Mannitol can cause rebound cerebral edema if kidney failure develops.
⚡ Electric (ionic) Equilibrium
Na⁺ governs volume; K⁺ governs electrophysiology.
Small change in potassium = massive electrophysiologic effect.
K⁺ shifts are more dangerous than K⁺ deficits/excess.
Aldosterone → Na⁺ reabsorption, K⁺ secretion.
Hyperkalemia suppresses myocardial conduction.
Hypokalemia increases risk of digoxin toxicity.
Acidosis shifts K⁺ out of cells.
β2 stimulation shifts K⁺ into cells.
Digitalis toxicity causes hyperkalemia from pump inhibition.
Hypocalcemia prolongs QT; hypercalcemia shortens QT.
Low magnesium → low K⁺ + low Ca²⁺ + refractory arrhythmias.
🔥 Acid–Base Equilibrium
pH < 7.10 → catecholamines fail → vasopressin indicated.
High lactate = oxygen debt until proven otherwise.
Normal pH does NOT exclude acidosis (mixed disorders).
Chloride ↑ → bicarbonate ↓ (electroneutrality).
Metabolic alkalosis is chloride deficit until proven otherwise.
Urine chloride <10 = saline responsive alkalosis (vomiting/post-diuretics).
Urine chloride >20 = mineralocorticoid excess alkalosis.
Anion gap metabolic acidosis = unmeasured acids present.
Delta gap identifies mixed disorders.
Respiratory compensation never normalizes pH.
If pCO₂ and HCO₃ move in same direction → compensation.
If pCO₂ and HCO₃ move opposite → mixed disorder.
Hyperchloremia = acidosis; hypochloremia = alkalosis.
Sodium bicarbonate helps only in extreme acidemia impairing perfusion.
In DKA: acidosis improves by closing the gap, not raising pH.
Lactate clearance correlates with survival.
🩺 Oxygen Delivery Integration
Perfusion must match oxygenation.
Low SpO₂ but good BP = still shock if DO₂ poor.
Hb < 7 g/dL → transfuse if shock persists.
ScvO₂ < 70% → inadequate oxygen delivery.
Shock cannot be reversed without addressing oxygen debt.
Rising urine output = best early sign of adequate perfusion.
Falling lactate = strongest biochemical sign of shock reversal.
🧠 Master integration rule
Fluids increase preload; pressors increase afterload; inotropes increase contractility; oxygen/Hb improve DO₂; acid–base fixes drug responsiveness.
Any shock is fixed by targeting the failing component — not treating all components blindly.
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