• Kadri Lillemäe, Johanna Annika Järviö, Marja Kaarina Silvasti-Lundell, Jussi Juha-Pekka Antinheimo, Juha Antero Hernesniemi, and Tomi Tapio Niemi.
• Department of Perioperative, Intensive Care and Pain Medicine, Helsinki University Hospital, University of Helsinki, Helsinki, Finland; Department of Anesthesiology and Intensive Care Medicine, Helsinki University Hospital, Töölö Hospital, Helsinki, Finland. Electronic address: kadri.lillemae@hus.fi.
• World Neurosurg. 2017 Dec 1; 108: 491-497.

ObjectiveWe aimed to characterize the occurrence of postoperative hematoma (POH) after neurosurgery overall and according to procedure type and describe the prevalence of possible confounders.MethodsPatient data between 2010 and 2012 at the Department of Neurosurgery in Helsinki University Hospital were retrospectively analyzed. A data search was performed according to the type of surgery including craniotomies; shunt procedures, spine surgery, and spinal cord stimulator implantation. We analyzed basic preoperative characteristics, as well as data about the initial intervention, perioperative period, revision operation and neurologic recovery (after craniotomy only).ResultsThe overall incidence of POH requiring reoperation was 0.6% (n = 56/8783) to 0.6% (n = 26/4726) after craniotomy, 0% (n = 0/928) after shunting procedure, 1.1% (n = 30/2870) after spine surgery, and 0% (n = 0/259) after implantation of a spinal cord stimulator. Craniotomy types with higher POH incidence were decompressive craniectomy (7.9%, n = 7/89), cranioplasty (3.6%, n = 4/112), bypass surgery (1.7%, n = 1/60), and epidural hematoma evacuation (1.6%, n = 1/64). After spinal surgery, POH was observed in 1.1% of cervical and 2.1% of thoracolumbar operations, whereas 46.7% were multilevel procedures. 64.3% of patients with POH and 84.6% of patients undergoing craniotomy had postoperative hypertension (systolic blood pressure >160 mm Hg or lower if indicated). Poor outcome (Glasgow Outcome Scale score 1-3), whereas death at 6 months after craniotomy was detected in 40.9% and 21.7%. respectively, of patients with POH who underwent craniotomy.ConclusionsPOH after neurosurgery was rare in this series but was associated with poor outcome. Identification of risk factors of bleeding, and avoiding them, if possible, might decrease the incidence of POH.Copyright © 2017 Elsevier Inc. All rights reserved.

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