Wenneberg SB, Hendén PL, Oras J, et al. - A major cause of impaired outcome after aneurysmal subarachnoidal hemorrhage (aSAH) is delayed cerebral ischemia (DCI), researchers conducted this observational cohort study examining if changes in heart rate variability (HRV) that preceed DCI could be detected. They assessed 64 patients with aSAH. They gathered HRV data for up to 10 days and analyzed them off‐line. HRV data could be analyzed in 55 cases. DCI developed in 15 cases. No correlation of mean of the HRV parameters in the first 48 h with the development of DCI was observed. Correlation of impaired HRV with 1‐year mortality was observed and patients developing DCI showed more increase in LF/HF ratio. Even though detection of DCI could not made by the intermittent analysis of HRV used in this study, continuous HRV monitoring seem to have potential in the identification of DCI after aSAH using different methods of analysis.