Acta Anaesthesiol Scand. 2021 Jun 17. doi: 10.1111/aas.13940. Online ahead of print.
ABSTRACT
BACKGROUND: Acute acidosis can increase the plasma potassium concentration. However, data on the effects of acute respiratory acidosis on plasma potassium concentration is conflicting. This study aimed to determine whether acute respiratory acidosis induces an immediate increase in plasma potassium concentration.
METHODS: This observational study was conducted on participants undergoing apnoea testing prior to final radiological examination, registered in an internal quality registry at Oslo University Hospital between 25, April 2013 and 1, May 2020. A total of 124 donors were assessed for inclusion. Sixteen donors with blood glucose concentrations exceeding 10 mmol l-1 were excluded; finally, data from 108 donors were included in the study. The apnoea test, which is a standard neurological test performed in potential organ donors prior to radiological confirmation of ceased brain circulation, induces respiratory acidosis. The arterial plasma potassium concentration, pH, and PaCO2 before and after the apnoea test were compared. Statistical analysis was conducted using the paired t-test.
RESULTS: The pre- and post-apnoea mean plasma potassium concentrations were 3.79 (95% confidence intervals [CI] 3.70-3.87) and 3.79 mmol l-1 (95% CI 3.70-3.88), respectively. The mean difference was -0.002 mmol l-1 (95% CI -0.04 to 0.04); the difference was not significant. The pre- and post-apnoea mean pH were 7.39 and 7.21, respectively and the mean difference was 0.175 (p<0.01). The pre- and post-apnoea mean PaCO2 were 5.66 and 9.48 kPa, respectively and the mean difference was -3.83 (p<0.01).
CONCLUSIONS: Acute respiratory acidosis does not lead to rapid changes in plasma potassium concentration during apnoea testing in potential organ donors.
PMID:34137462 | DOI:10.1111/aas.13940
