Postoperative drainage for 6, 12, or 24 h after burr-hole evacuation of chronic subdural hematoma in symptomatic patients (DRAIN-TIME 2): study protocol for a nationwide randomized controlled trial

Table 2 Schedule of the trial enrollment, interventions, and assessments

	Enrolment	Surgery	Post-surgery
Time point	Ad	IO	D1	D2	3 mon
Enrollment
Eligibility screen	X
Informed consent	X
*Randomization*	X
Interventions
*Placement of a subdural drain (6, 12, or 24 h)*		X
Assessments
*Routine labs*	X		X
*GCS*	X		X
*mRS*	X		X		X
*Clinical examination*	X
*SF-36*	X		X^#		X
*Economic data*					X
CSDH fluid*		X
CSDH membrane*		X
Blood*	X

Schedule of assessments
Ad admission, IO intraoperative, D day, mon months, GCS Glasgow Coma Scale, mRS Modified Rankin Scale, SF-36 Short Form (36) Health Survey
^*Only collected in patients recruited to sub-study at Odense University Hospital and Rigshospitalet
^#If not done the day of admission

ISSN: 1745-6215