Serum Calcium Dynamics and Delayed Hydrocephalus Prediction in SAH Patients

A clinical study analyzed serial serum calcium measurements in 302 spontaneous subarachnoid hemorrhage patients monitored for 90 days. The research developed and validated a nomogram for predicting delayed hydrocephalus, which occurred in 24.2% of the cohort. The model incorporated admission serum calcium, hypertension, Hunt-Hess grade, smoking history, dyslipidemia, alcohol use, and diabetes.

Use Cases

• Validate the predictive cutoff of serum calcium at 72 hours (≤7.65 mg/dL) for delayed hydrocephalus in a new patient cohort.
• Assess the performance of the admission-based nomogram, which includes variables like Hunt-Hess grade and hypertension, for early risk stratification.
• Analyze the temporal trend of serum calcium levels (admission, 72h, 7 days) in relation to clinical outcomes like neurological deterioration.
• Investigate the association between patient history features such as smoking history, dyslipidemia, and alcohol use with the development of delayed hydrocephalus.

Strengths

• Study includes 302 patient records with a clear outcome measure (24.2% incidence of delayed hydrocephalus).
• Model was externally validated across two hospitals, achieving an AUC of 0.898.
• Provides specific, high-performance predictive thresholds, such as a 72-hour serum calcium cutoff with 85.6% sensitivity and 80.3% specificity.

Limitations

• The dataset is small (13.0 KB), likely containing summary results and model parameters rather than raw patient-level data.
• Predictive calcium cutoff may vary across different laboratory assays, requiring local calibration.
• Observational cohort design may contain unmeasured confounding factors.

Provenance

Source

Figshare, authored by Di Wu.

Collection Method

Observational cohort study analyzing serial serum calcium measurements in SAH patients.

Time Range

Patient monitoring period of 90 days post-ictus.

Freshness

Last updated March 2026.

Geography

Cohort from two hospitals; specific locations unknown.