Decode Medicine from OPD to ICU rounds
Pleural Effusion Normal Pleural Space Contains 5–15 mL fluid Produced mainly by parietal pleura Absorbed via pleural lymphatics Functions as a lubricant allowing lung movement Pleural effusion develops when:Fluid formation > Fluid removal Etiology Transudative Pleural Effusion Cause Mechanism Heart failure(~80% of transudates) Increased hydrostatic pressure Cirrhosis (hepatic hydrothorax)(~13% of transudates) Ascitic fluid migration Nephrotic […]
Hypokalemia Hypokalemia = Serum potassium (K⁺) <3.5 mEq/L,it is is less dangerous than hyperkalemia. Severity Serum K⁺ Mild 3.0–3.5 mEq/L Moderate 2.5–2.9 mEq/L Severe <2.5 mEq/L 98% intracellular and Only 2% extracellular,Therefore serum potassium may not accurately reflect total body stores. Potassium Homeostasis Mechanism Site/Stimulus Action on Potassium Na⁺/K⁺-ATPase Pump Stimulated by insulin, β₂-agonists, thyroid
Ascites Normal peritoneal cavity contains <50 mL fluid which is usually not visible on routine abdominal ultrasound. Clinically detectable ascites usually requires >1.5 L fluid. Most common cause worldwide: Liver cirrhosis (~80–85% cases). Epidemiology Among patients with cirrhosis: Ascites is the most common complication. Approximately 50% develop ascites within 10 years of diagnosis. Development of
ATRIAL FIBRILLATION Atrial fibrillation is a supraventricular tachyarrhythmia characterized by: Irregularly irregular rhythm(One exception to these criteria is that if AF is combined with heart block, then the ventricular response may be regular.) No distinct P waves(If it is unclear whether there are P waves or fibrillation waves, consider obtaining a Lewis Lead ECG) Fibrillatory
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Hepatorenal Syndrome (HRS) Definition Hepatorenal syndrome (HRS) is a functional, potentially reversible acute kidney injury (AKI) occurring in patients with advanced cirrhosis and portal hypertension(Ascites), in the absence of intrinsic renal disease or structural kidney damage. Epidemiology Occurs in advanced decompensated cirrhosis (often Child-Pugh C) Triggers: Refractory ascites Spontaneous bacterial peritonitis (SBP) Large-volume paracentesis without
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HYPONATREMIA DEFINITION Hyponatremia = Serum Na⁺ < 135 mEq/L Most common electrolyte abnormality in ICU Severity classification Severity Serum Na⁺ Mild 130–134 Moderate 125–129 Severe <125 PATHOPHYSIOLOGY Hyponatremia is fundamentally a disorder of water balance, NOT sodium deficit Excess ADH (vasopressin) → water retention → dilution of Na⁺ ADH PHYSIOLOGY Released from posterior pituitary Stimuli:
Acute Exacerbation of COPD (AECOPD) AECOPD by GOLD = An event characterized by worsening dyspnea, cough, and/or sputum production over less than 14 days, which may be accompanied by tachypnea and/or tachycardia and is often associated with increased local and systemic inflammation caused by airway infection, pollution, or other insults. Respiratory failure is usually due
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Community Acquired Pneumonia Community-acquired pneumonia (CAP) is an acute infection of the lung parenchyma occurring in a non-hospitalized individual or developing ≤48 hours of hospital admission, not residing in long-term care and without recent healthcare exposure. Category Definition Clinical relevance CAP Outside hospital or ≤48 hr admission Standard community pathogens HAP ≥48 hr after admission
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Septic Cardiomyopathy (Sepsis-Induced Myocardial Dysfunction, SIMD) Septic cardiomyopathy (SCM) is an acute, reversible myocardial dysfunction occurring during sepsis or septic shock(20–60% of septic shock patients), characterized by: Reduced myocardial contractility Ventricular dilatation Impaired response to fluid and catecholamines Usually recovers within 7–10 days in survivors SCM occurs without acute coronary artery occlusion and is caused
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Warfarin Induced Coagulopathy (Warfarin Over-Anticoagulation) Normal Vitamin K Cycle Vitamin K is required for γ-carboxylation of: Factors II, VII, IX, X Protein C Protein S Vitamin K is recycled by:Vitamin K epoxide reductase (VKORC1) Warfarin inhibits VKORC1.Factor VII falls first—>PT/INR rises within 24–36 hours.Maximum anticoagulant effect:≈ 5 days Causes of Warfarin-Induced Coagulopathy 1. Excess Dose
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