Acute and Critical Care

Original Articles

Neurosurgery
Role of serum magnesium in post-aneurysmal subarachnoid hemorrhagic hydrocephalus: Moinay Kim, Hyunchul Jung, Seung Bin Kim, Jun Ha Hwang, Hanwool Jeon, Yeongu Chung, Youngbo Shim, Jae Hyun Kim, Joonho Byun, Aiden Cousins, Wonhyoung Park, Jung Cheol Park, Jae Sung Ahn, Seungjoo Lee; Acute Crit Care. 2025;40(4):582-593. Published online November 28, 2025; DOI: https://doi.org/10.4266/acc.003550

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Abstract PDF: Background
Post-hemorrhagic hydrocephalus (PHH) is a frequent complication of aneurysmal subarachnoid hemorrhage (aSAH), yet the relationship between serum magnesium (Mg) level and PHH remains unclear. To our knowledge, this is the first prospective study to specifically examine the association between admission serum Mg level and PHH in aSAH patients.
Methods
In this prospective, multicenter study (October 2019–October 2024), 131 patients with confirmed aSAH were enrolled from four neuro-intensive care units. Patients were stratified by admission serum Mg level as <2.2 mg/dL or ≥2.2 mg/dL. The primary outcome was PHH incidence; secondary outcomes were cerebral vasospasm (CV), delayed cerebral ischemia (DCI), and 30-day modified Rankin Scale (mRS) score.
Results
Baseline characteristics were similar between groups. Serum Mg ≥2.2 mg/dL was not significantly associated with reduced vasospasm, DCI, or poor functional outcome. However, serum Mg >2.5 mg/dL correlated with lower PHH incidence in univariate analysis (odds ratio, 0.36; P=0.027) but not in multivariate analysis (P=0.136). Independent predictors of PHH were posterior circulation aneurysm, high Fisher grade, and high Hunt and Hess grade. Poor 30-day mRS was independently associated with high Fisher and Hunt and Hess grades.
Conclusions
Admission serum Mg level was not independently associated with PHH, although a potential protective trend was noted at higher levels (>2.5 mg/dL). These findings suggest a possible role of Mg in PHH prevention. Further prospective trials are warranted to clarify the therapeutic potential of Mg and to establish optimal monitoring and correction strategies in aSAH management.

Neurosurgery
A low preoperative platelet-to-white blood cell ratio is associated with acute kidney injury following cerebral aneurysm treatment in South Korea: Seung-Woon Lim, Woo-Young Jo, Hee-Pyoung Park; Acute Crit Care. 2025;40(1):59-68. Published online February 21, 2025; DOI: https://doi.org/10.4266/acc.003120

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Background
Inflammation is involved in the pathophysiology of postoperative acute kidney injury (AKI). We investigated whether preoperative platelet-to-white blood cell ratio (PWR), a novel serum biomarker of systemic inflammation, was associated with postoperative AKI following cerebral aneurysm treatment. We also compared the discrimination power of preoperative PWR with those of other preoperative systemic inflammatory indices in predicting postoperative AKI.
Methods
Perioperative data including preoperative systemic inflammatory indices and cerebral aneurysm-related variables were retrospectively analyzed in 4,429 cerebral aneurysm patients undergoing surgical clipping or endovascular coiling. Based on the cutoff value of preoperative PWR, patients were divided into the high PWR (≥39.04, n=1,924) and low PWR (<39.04, n=2,505) groups. After propensity score matching (PSM), 1,168 patients in each group were included in the data analysis. AKI was defined according to the Kidney Disease Improving Global Outcomes guidelines.
Results
Postoperative AKI occurred more frequently in the low PWR group than in the high PWR group before PSM (45 [1.8%] vs. 7 [0.4%], P<0.001) and after (17 [1.5%] vs. 5 [0.4%], P=0.016). A low preoperative PWR was predictive of postoperative AKI before PSM (odds ratio [95% CI], 3.93 [1.74–8.87]; P<0.001) and after (3.44 [1.26–9.34], P=0.016). Preoperative PWR showed the highest area under the curve for postoperative AKI (0.713 [0.644–0.782], P<0.001), followed by preoperative platelet-to-neutrophil ratio (0.694 [0.619–0.769], P<0.001), neutrophil percentage-to-albumin ratio (0.671 [0.592–0.750], P<0.001), white blood cell-to-hemoglobin ratio (0.665 [0.579–0.750], P<0.001), neutrophil-to-lymphocyte ratio (0.648 [0.569–0.728], P<0.001), and systemic inflammatory index (0.615 [0.532–0.698], P=0.004).
Conclusions
A low preoperative PWR was associated with postoperative AKI following cerebral aneurysm treatment.

Citations

Citations to this article as recorded by

Association between the platelet to white blood cell ratio and short term mortality in critically ill patients with atherosclerotic cardiovascular disease: A retrospective study and machine learning with external validation
Zhantao Cao, Hewei Qin, Yue Niu, Zilu Zhang, Guoju Dong
International Journal of Medical Informatics.2026; 209: 106267. CrossRef
Platelet-to-white blood cell ratio as a predictor of postoperative outcomes in acute type A aortic dissection: a single-center retrospective analysis
Biwen Yang, Yucheng Hou, Mingzhu Xu, Tingbo Jiang
Frontiers in Cardiovascular Medicine.2026;[Epub] CrossRef
A machine learning predictive model for acute kidney injury among aneurysmal subarachnoid hemorrhage patients
Ruoran Wang, Lingzhu Qian, Yunhui Zeng, Linrui Cai, Min He, Jianguo Xu, Yu Zhang
BMC Medical Informatics and Decision Making.2025;[Epub] CrossRef

Case Report

Reversal of Focal Neurologic Deficit due to Preoperative Intracranial Pressure Reduction in a Patient with Early Rebleeding of Cerebral Aneurysm: A Case Report: Hyo Seok Na, Sang Hyun Park, Young Tae Jeon, Song Hwan Do, Hwan Hee Kim, Sang Chul Lee, Hee Pyoung Park; Korean J Crit Care Med. 2008;23(1):40-43.; DOI: https://doi.org/10.4266/kjccm.2008.23.1.40

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Abstract PDF: In the first hours after initial hemorrhage, up to 15% of patients with subarachnoid hemorrhage (SAH) due to aneurysmal rupture may have a sudden episode of clinical deterioration resulting from rebleeding. In patients suffering from an aneurismal rebleeding, the prognosis becomes much poor. Early detection of rebleeding and preoperatively appropriate medical treatment for increased intracranial pressure (IICP) might be crucial to decrease the overall mortality and morbidity rate in a patient with aneurismal rebleeding. We report a case of a successful reversal of focal neurological deficit showed in a patient with abrupt rebleeding of ruptured aneurysm whose intracranial pressure was preoperatively reduced with hyperventilation, and thiopental and mannitol administration under general anesthesia in angiography suite, although the patient ended up in death due to postoperative IICP.

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