🧪 FICK PRINCIPLE EXPLAINED — HOW TO CALCULATE CARDIAC OUTPUT USING OXYGEN CONSUMPTION

The Fick Principle is one of the most important concepts in cardiovascular physiology, hemodynamics, pulmonary medicine, and critical care. In this video, you'll learn how cardiac output is determined using oxygen consumption and oxygen extraction by tissues. 🧮 Fick Equation Cardiac Output (CO) = VO₂ / (Ca − Cv) Where: ✅ VO₂ = Oxygen consumption per minute ✅ Ca = Arterial oxygen content ✅ Cv = Venous oxygen content ✅ Ca − Cv = Arteriovenous oxygen difference 🧠 Conceptual Understanding The body extracts oxygen from arterial blood as it passes through tissues. 👉 Increased oxygen extraction: • Lower venous oxygen content • Larger arteriovenous O₂ difference 👉 Decreased oxygen extraction: • Higher venous oxygen content • Smaller arteriovenous O₂ difference 🏃 Exercise Physiology • Increased oxygen demand (VO₂) • Increased heart rate and stroke volume • Increased cardiac output • Increased oxygen extraction • Lower venous oxygen content 🚨 Clinical Correlations 🫀 Heart Failure • Reduced cardiac output • Increased tissue oxygen extraction • Very low mixed venous oxygen saturation ⚡ Septic Shock • Increased cardiac output • Impaired tissue oxygen extraction • Elevated venous oxygen saturation ☠️ Cyanide Poisoning • Cells cannot utilize oxygen • Venous oxygen remains abnormally high • Oxygen delivery may be normal, but utilization is impaired 📚 This video is perfect for: ✅ USMLE Step 1 ✅ USMLE Step 2 CK ✅ COMLEX ✅ NCLEX ✅ Internal Medicine Boards ✅ Pulmonary & Critical Care Fellows ✅ Medical Students ✅ Nursing Students ✅ Physician Assistant Students ✅ Residents 🎯 High-Yield Topics Covered: • Cardiac Output • Fick Principle • Oxygen Consumption (VO₂) • Oxygen Extraction • Mixed Venous Oxygen Saturation • Exercise Physiology • Heart Failure • Septic Shock • Cyanide Toxicity • Hemodynamics 📺 Subscribe for more high-yield medical education:    / @femstarmd   #FickPrinciple #cardiacoutput #cardiology #criticalcare #pulmonarycriticalcare #hemodynamics #heartfailure #septicshock #CyanidePoisoning #cardiovascularphysiology #usmle #usmlestep1 #usmlestep2ck #nclex #internalmedicine #medicaleducation #meded #FemStarMD