Safety and Additive Efficacy of Dual CSF Drainage (Ventricular + Lumbar) in Severe Aneurysmal Subarachnoid Hemorrhage: A Secondary Analysis of the EARLYDRAIN Trial

The EARLYDRAIN trial demonstrated the efficacy of lumbar drainage (LD) in aneurysmal subarachnoid hemorrhage (aSAH) but did not differentiate between patients requiring dual drainage [LD plus external ventricular drainage (EVD)] versus single-catheter management.

The purpose of this study was to investigate the safety and additive efficacy of simultaneous double drainage (EVD + LD) compared with isolated EVD in patients with high-grade aSAH, stratifying by actual device usage.

This secondary analysis stratified 254 EARLYDRAIN trial participants on the basis of daily intensive care unit (ICU) device records. To minimize selection bias, the isolated LD cohort (n = 43), characterized by significantly milder admission severity (mean Glasgow Coma Scale (GCS) 13.3, p < 0.001), was excluded from efficacy models. The primary analysis compared simultaneous double drainage (n = 92) vs. isolated EVD (n = 119). Multivariable logistic regression models were adjusted for age, Hunt–Hess grade, modified Fisher grade, and total cerebrospinal fluid (CSF) drainage volume.

Double drainage and isolated EVD groups were well balanced for admission GCS (p = 0.672) and intraventricular hemorrhage prevalence (p = 0.355). Suspected infection rates were similar (47.8% vs. 44.5%, p = 0.631). In multivariable analysis, the drainage strategy (double vs. EVD) was not an independent predictor of clinical vasospasm (OR 1.02, p = 0.950), permanent shunt dependency (OR 0.75, p = 0.382), or unfavorable functional outcome (mRS 3–6) at 6 months (OR 0.75, p = 0.336). Instead, shunt dependency was independently predicted by higher total CSF drainage volume (p < 0.001) and age. Conversely, unfavorable functional outcome was driven exclusively by admission Hunt–Hess grade (p < 0.001) and age (p < 0.001), with total CSF volume showing no significance (p = 0.704).

In patients with high-grade aSAH, the addition of a lumbar drain to an EVD is safe but does not independently mitigate vasospasm or improve functional outcomes when adjusted for injury severity. High-volume CSF drainage predicts shunt dependency but is not a marker of functional recovery, suggesting a “volume paradox” in severe hydrocephalus. Yet, because this was not a prespecified analysis, it is not possible to definitively establish the superiority of a dual-drainage strategy over ventricular drainage alone. Therefore, these results should be interpreted as exploratory.