# Blood gases

Flashcards by snough, updated more than 1 year ago
 Created by snough over 5 years ago
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### Description

Flashcards on Blood gases, created by snough on 10/26/2014.

## Resource summary

 Question Answer Winter's formula Calc's compensation in metabolic acidosis pCO2 = (1.5 x bic) +8 Anion gap calculation AG = (Na + K) minus (Cl + bic) Normal is 12 to 15 Delta gap calculation Calc's if mixed or pure acid/base disorder = Delta AG/delta bic = Calc AG minus 12/(24 minus bic) Delta gap values Interpretation >2: met acid AND met alk/preexisting resp acidosis 1 to 2 pure HAGMA 0.4 to 0.8 NAGMA + HAGMA <0.4 pure NAGMA (hyperchloraemic) NAGMA and K Most a/w hypokalaemia except hyperchloraemia, adrenal insufficiency, ARF Low AG Causes Lithium Hypoalbuminaemia Respiratory acidosis Compensation Bic: CO2 rise Acute 1:10 Chronic 4:10 Respiratory alkalosis Compensation Bic:CO2 fall Acute 2:10 Chronic 5:10 Osmolar gap (2xNa) + urea + glucose + EtOH Normal is 10 High osmolar gap Causes Alcohols Glucose Osmotic diuretics (mannitol, sorbitol) Alveolar gas equation At sea level PAO2 minus PaO2 where PAO2= (FiO2x713) minus (1.25xPaCO2) In room air, FiO2x713 = 150 Alveolar gas equation Normal values for age (Age/4) + 4 K correction for pH For every decrease pH 0.1, K increases 0.5 eg if pH 7.2, expect K to be 6 (reverse applies if pH increases) Ca corrected for pH For every pH decrease 0.1, Ca increase 0.05 HAGMA Causes MUDPILES (methanol, ureamia, DKA, paraldehyde/paracetamol, isoniazid, lactic acidosis, EtOH, salicylates) NAGMA Causes USED CARP Renal/GI loss of bicarb OR gain acid (ureterosigmoidostomy, saline admin, endo, diarrhoea, carbonic anhydrase inhibitor, ammonium, RTA, pancreatititis)

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