Relationship between time related serum albumin concentration, optic nerve sheath diameter, cerebrospinal fluid pressure, and neurological prognosis in cardiac arrest survivors

Aim: The optimal time to measure serum albumin concentration (SAC) to predict prognosis in cardiac arrest (CA) survivors has not been elucidated. We aimed to compare the relationships between time-related SAC, optic nerve sheath diameter (ONSD), intracranial pressure (ICP), and neurological prognosis in CA survivors.

Methods: We undertook a retrospective study examining CA patients treated with target temperature management (TTM). ICP was measured using cerebrospinal fluid (CSF) pressure and ONSD was obtained before TTM. SAC was measured repeatedly at 4-6 h intervals from the hospital arrival time. We analysed CSF pressure, ONSD, and minimum SAC (MSAC) separately, or in combination, to predict poor neurological outcome.

Results: Of 83 patients enrolled, the good outcome group comprised 25 (34%) patients. MSAC at 24 h (MSAC24) had a higher area under the receiver operating characteristic curve (AUC) (0.687; 95% confidence interval (CI), 0.668-0.926) than other time points. CSF pressure showed a higher AUC (0.973; 95% CI, 0.911-0.996) than MSAC24 and ONSD (0.677; 95% CI, 0.565-0.776). In contrast to using MSAC24 and ONSD separately, the combination of both modalities resulted in a better AUC, thus improving the prediction of the neurological outcome (0.734; 95% CI, 0.626-0.825) and ICP (0.758; 95% CI, 0.651-0.845) after return of spontaneous circulation (ROSC) from CA.

Conclusion: A higher ICP was strongly associated with and seemed predictive of poor outcome. Furthermore, the MSAC24/ONSD combination may be a useful predictor of high ICP and poor neurological outcome. Prospective studies should be conducted to confirm these results.