Deacon's Challenge No 148 - Answer

摘要

It is becoming increasingly common practice to replace pH with hydrogen ion concentration when reporting acid-base data. Analysis of cord blood in a neonate gave a hydrogen ion concentration of 66 nmollL, with a pCO2 of 7.4 kPa and an actual bicarbonate of 20 mmol/L. After taking steps to improve ventilation and circulation the end-expiration pCO2 is 5.1 kPa and the actual bicarbonate of 16 nmol/L Calculate the new hydrogen ion concentration in nmol/L, stating any assumptions made.