Elective outpatient middle meningeal artery embolization for chronic subdural hematoma is safe.

Background: Middle meningeal artery embolization (MMAE) is a safe and effective treatment for chronic subdural hematoma (cSDH); however, the appropriate level of postoperative care is unknown.

Objective: To evaluate whether elective MMAE for cSDH could be safely performed in an outpatient setting.

Methods: This was a multicenter, retrospective study of patients with cSDH who underwent elective MMAE. Patients were categorized as either inpatient (admitted for ≥1 night of hospitalization after MMAE) or outpatient (discharged on the same day of MMAE). Patient demographics, radiological data, procedural details, and follow-up data were collected. The primary endpoint was periprocedural complications, and secondary outcomes included emergency department (ED) visits or unplanned readmission within 24 hours, 1-7 days, and 8-30 days after MMAE.

Results: Elective MMAE procedures were carried out in 190 patients, of which 45.3% (n=86) were outpatient procedures and 54.7% (n=104) inpatient. There were 7 (3.7%) periprocedural complications (one outpatient, six inpatient; P=0.12). Five patients presented to the ED and were readmitted within 24 hours of MMAE (three outpatient, two inpatient). Six patients presented to the ED 1-7 days after MMAE (three outpatient, three inpatient); three were subsequently admitted (one outpatient and two inpatient). Nine patients presented to the ED 8-30 days after MMAE (two outpatient and seven inpatient); three were subsequently readmitted (all inpatient). No elective outpatient MMAE resulted in a readmission attributable to the procedure within the examined time frame.

Conclusion: Elective MMAE can be safely performed as an outpatient procedure without increased risk of postprocedural adverse events in most eligible patients with cSDH.