23/05/2026
Hypovolemic Shock: Life-threatening circulatory failure due to critical loss of intravascular volume, causing reduced venous return, decreased preload, low stroke volume, reduced cardiac output, and poor tissue perfusion. It may be hemorrhagic or non-hemorrhagic, and management requires rapid recognition, resuscitation, and correction of the underlying fluid or blood loss.
πΉ Core presentation
β Tachycardia
β Hypotension
β Cold clammy skin
β Low urine output is an important perfusion clue.
πΉ Early / compensated features
β Anxiety or restlessness
β Thirst
β Tachycardia
β Narrow pulse pressure may appear before frank hypotension.
πΉ Skin and peripheral perfusion clues
β Cool extremities
β Pale or mottled skin
β Delayed capillary refill
β Weak, thready peripheral pulses.
πΉ CNS features
β Agitation
β Confusion
β Drowsiness
β Altered mental status suggests worsening cerebral hypoperfusion.
πΉ Renal features
β Oliguria
β Rising creatinine may occur
β Concentrated urine in early dehydration
β Urine output is a key marker of resuscitation response.
πΉ Respiratory / metabolic clues
β Tachypnea
β Lactic acidosis
β Low bicarbonate may occur
β Reflects tissue hypoxia and anaerobic metabolism.
πΉ Common causes
β Hemorrhage: trauma, GI bleed, ruptured ectopic pregnancy, postpartum hemorrhage
β Fluid loss: vomiting, diarrhea, burns, severe dehydration
β Third spacing: pancreatitis, bowel obstruction, peritonitis
β Always search for occult bleeding if no obvious fluid loss.
πΉ Diagnosis / assessment
β Clinical diagnosis based on hypoperfusion
β Monitor BP, HR, mental status, skin perfusion, and urine output
β Check CBC, electrolytes, creatinine, lactate, ABG/VBG, coagulation profile, and type & crossmatch
β FAST ultrasound, CT, endoscopy, or surgical evaluation may be needed to find bleeding source.
πΉ Initial management
β ABC approach first
β Give high-flow oxygen if hypoxic or severely shocked
β Establish two large-bore IV lines or intraosseous access
β Begin rapid isotonic crystalloid resuscitation while identifying the cause.
πΉ Hemorrhagic shock management
β Control bleeding immediately
β Direct pressure, tourniquet, pelvic binder, endoscopy, embolization, or surgery depending on source
β Give packed RBCs early if major blood loss is suspected
β Activate massive transfusion protocol for severe hemorrhage.
πΉ Non-hemorrhagic shock management
β Replace fluid losses with isotonic crystalloids
β Treat vomiting, diarrhea, burns, or sepsis-like fluid losses
β Correct electrolyte abnormalities
β Monitor closely for fluid overload in renal or cardiac disease.
πΉ Vasopressor clue
β Fluids and source control are primary
β Vasopressors are not first-line for simple hypovolemia
β Use if hypotension persists despite adequate volume or while resuscitation is ongoing
β Norepinephrine is commonly used when vasopressor support is needed.
πΉ Monitoring after resuscitation
β Reassess BP, HR, mental status, capillary refill, and urine output
β Trend lactate and base deficit
β Monitor hemoglobin, electrolytes, and acid-base status
β Watch for hypothermia, acidosis, and coagulopathy in hemorrhagic shock.
πΉ High-Yield Points
β Hypovolemic shock = low intravascular volume β low preload β low cardiac output
β Classic signs: tachycardia, hypotension, cool clammy skin, oliguria, altered mental status
β Hypotension is a late sign in young healthy patients
β Management = ABCs + rapid IV/IO access + fluids/blood + source control
β In hemorrhagic shock, stopping the bleeding is as important as replacing volume.
Medical disclaimer: This note is for education only and is not a substitute for professional medical advice, diagnosis, or treatment.
