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. 2022 Feb 1;98(5):e459–e469. doi: 10.1212/WNL.0000000000013126

Figure 1. High Middle Cerebral Artery Velocity and Epileptiform Abnormality Incidences Across Delayed Cerebral Ischemia and Non–Delayed Cerebral Ischemia Groups.

Figure 1

Patients were monitored with transcranial Doppler ultrasound (TCD) for an average (±SD) of 8.98 (±4.30) days with a mean start day 1.75 (±1.18) after subarachnoid hemorrhage (SAH). The mean duration of continuous EEG (cEEG) recordings was 6.32 (±3.22) days with a mean start date of 1.94 (±1.30) days post-SAH. (A) Histogram of delayed cerebral ischemia (DCI) incidence over the first 15 days post-SAH shows that peak DCI incidence occurs on day 5 (10/56 patients with DCI [17.86%]) and day 9 (8/56 patients with DCI [14.28%]). (B) Histogram of TCD alarms over the first 15 days post-SAH shows that, for patients with DCI, peak incidence of TCD alarms occurs on day 3, and peak incidence of TCD alarms for patients without DCI occurs on day 4. The first instance of any TCD alarm occurrence within the non-DCI group occurred on day 3. (C) Histogram of EEG alarms shows that a higher proportion of patients with DCI get EEG alarms. eTable 1 (links.lww.com/WNL/B676) shows counts of DCI and patients without DCI tabulated against DCI alarms occurring at any time during monitoring (prior to DCI).