Abg

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  • 1. ABG INTERPRETATION STEP 1: PH determination -[H+] [HCO3 ] Valid ABG = ---------------------- =24P CO2Normal 7.35 7.45 (H+) = 80 LAST 2 DIGITS OF Ph (eg:7.23) STEP 2: PH (7.34-7.45)ACIDOSISALKALOSISRESPIRATORYMETABOLOCCO2HCO3-ACUTERESPIRATORYMETABOLICCHRONICDr Ranjith Kumar/ ABG notesPage 1

2. To determine respiratory acidosis whether is acute or chronic: H PCO2 0.8 Acute Respiratory acidosis 0.3 0.8 Acute on Chronic H = Normal H+ (40) subtracted by Actual patient H+Pco2 = (Patient PCo2 40)Step 3: Compensation Metabolic compensation for respiratory disorder AcidosisAlkalosis12 ACUTEAcidosisAlkalosis3.54 CHRONICCo2 we will take as 10 in every step Respiratory acidosis Acute[HCO3-] increases by 1 for each 10-mm Hg increase in PCO2Chronic[HCO3-] increases by 3.5 for each 10-mm Hg increase in PCO2Respiratory alkalosis Acute[HCO3-] falls by 2 for each 10-mm Hg decrease in PCO2Chronic[HCO -Dr Ranjith Kumar/ ABG notes3 ] falls by 4 for each 10-mm Hg decrease in PCO2Page 2 3. Respiratory compensation for metabolic disorder Metabolic acidosis PCO2 = 1.5 [HCO3-] + 8 2 Metabolic alkalosis PCO increases by 7 mm Hg for each 10 mEq/L increase in serum HCO 2 3Met.AcidosisNormalPositiveAnion gapAnion gap10-12MUDPILESDiarrhoea RTA urinary tract diversion Ammoniam chloride intake posthypocapnicMixed disorder -Corrected HCO3 = Measured HCO3 + Anion gap - 12 HCO3-Dr Ranjith Kumar/ ABG notesPage 3