Randomized Controlled Trial Investigating Optimal Treatment for Chronic Subdural Hematoma

Compact Trial - A Randomized Controlled Trial Investigating Optimal Treatment for Chronic Subdural Hematoma

Setup of comparative trial The goal of this study is to determine whether one surgical treatment for chronic subdural hematoma is better than the other. Patients with a clear indication for drainage of subdural hematoma (as stated under "Surgical options") will be randomized into three groups. One group will receive twist drill craniostomy followed by drainage during 48 hours. One group will undergo burr hole drainage (single if possible, double if necessary) with irrigation and drainage during 48 hours postoperatively. One group will undergo a minicraniotomy with trephine or craniotome, with wide opening of all visible membranes, rigorous irrigation and placement of Jackson-Pratt drain, followed by closed system draining during 48 hours. Postoperative results and complications will be compared between the three groups.

Study Overview

• Status: Completed
• Conditions: Chronic Subdural Hematoma
• Intervention / Treatment: Procedure: Mini-craniotomy; Procedure: Twist Drill Craniostomy; Procedure: Burr Hole Craniostomy

Detailed Description

Study design The study is set up as an open randomized controlled three-arm trial. Patients will be randomized into three groups.

Study setup and procedures The goal of this study is to determine if one surgical treatment for chronic subdural hematoma is better than the other. Patients with a clear indication for drainage of subdural hematoma (as stated under "Surgical options") will be randomized into three groups. One group will receive twist drill craniostomy followed by drainage during 48 to 96 hours. One group will undergo burr hole drainage (single if possible, double if necessary) with irrigation and drainage during 48 to 96 hours postoperatively. One group will undergo a minicraniotomy with trephine or craniotome, with wide opening of all visible membranes, rigorous irrigation and placement of Jackson-Pratt drain, followed by drainage during 48 to 96 hours.

Patients diagnosed with chronic subdural hematoma on CT scan, will be operated on as soon as possible. The type of operation will be determined by randomization. The duration of surgery as well as presence of brain reexpansion (in case of burr hole or minicraniotomy) will be recorded. Postoperatively, patients will be transferred to the neurosurgery ward with a subdural drainage system in place. Drainage system is removed 48 to 96 hours postoperatively, regardless of the type of operation (48 hours standard; longer period of drainage if drainage less than 50cc/24h evaluated on the second 24 hours postoperatively. Maximal time of continuous drainage is 4 days or 96 hours postoperatively). Drained volume will be recorded. Evaluation will be performed preoperatively, 48h postoperatively, on discharge, after 6 weeks and after 6 months, and will include:

• Age, sex, comorbidities (anticoagulation or coagulopathy, dementia, etc)
• Clinical status (cognitive state (orientation in time, place and person), Speech (aphasia/dysarthria), Motor function (hemiplegia/paresis); walking independently (y/n); independence for ADL (y/n); Markwalders Scale, modified Rankin Scale
• Imaging characteristics (location (frontal/parietal/occipital, uni-bilateral), size (max diameter), Density(Hounsfield units, age of hematoma), membranes (y/n). An approximate total of five CTscans will be performed, totaling (5x2=)10mSv of radiation exposure Length of hospital stay will be recorded. The primary endpoint will be the reoperation rate at 40 days. We hypothesize that subdural hematomas treated by minicraniotomy will require less reoperation (reduced to 5%) than burr hole craniostomy or twist drill craniotomy (15 to 25% according to literature).

Secondary endpoints: Clinical endpoints: Duration of operation, technical difficulties during operation. Duration of hospital stay. Improvement of Clinical status and speed thereof, Improvement of CT-imaging characteristics, complication rate (bleeding, local or systemic infection, epilepsy,…). We expect that subdural hematomas operated on by minicraniotomy and large opening of membranes will lead to quicker improvement of CT-imaging than burr hole treatment or twist drill craniotomy.

Exploratory endpoints To determine which type of intervention can be beneficial to which type of patients. Hypothesis is that in case of homogenous chronic subdural hematoma, twist drill craniostomy would pose the least risks, whereas in multiloculated mixed-density hematomas, minicraniotomy would be the best option.

The subjects Number of subjects A total of 150 patients will be included in the study. Inclusion criteria All consecutive patients with chronic subdural hematoma with indication for surgical intervention: clinical symptoms as a result of the subdural collection, or important mass effect (as indicated by a midline shift of more than 5mm) Exclusion criteria Patients under the age of 18 will be excluded Patients who have undergone previous cranial surgery which would limit surgical options (for example bone flap already in place) Replacement of subjects Dropout, in the case of this trial, would only signify loss to follow-up since patients will be operated on after consenting to participation in the trial. In case of dropout, the available data will be evaluated and included in the analysis when possible. If dropout occurs after the scheduled six weeks postoperative visit, data is still usable for analysis of primary endpoint. Data from earlier on in treatment (for example duration of surgery, hospital stay, etc) will be usable for analysis of secondary endpoints.

Restrictions and prohibitions for the subjects Antiaggregant drugs (Aspirin, Asaflow, Cardioaspirine, Plavix, Clopidogrel, Ticlid,…) will be stopped for at least 5 days (ideally 10days) before surgery when possible and, if necessary (this will be discussed with the treating physician/cardiologist), replaced by short acting low molecular weight heparins given subcutaneously (no administration on the day of surgery). Anticoagulants (Sintrom, Marcoumar, Marevan) will be replaced by short acting low molecular weight heparins given subcutaneously (no administration on the day of surgery).

Study analysis Sample size calculation Power and sample size estimations are based on data from the literature indicating that the reoperation rate at 40 days for burr hole craniostomy or twist drill craniotomy ranges from 25% to 15% (control groups), and our assumption that minicraniotomy would decrease the reoperation rate at 40 days to 5%. In a test for trend in proportions, sample sizes of 49, 49, and 49 are obtained from 3 groups with proportions equal to 0.25, 0.15, and 0.05. The total sample of 147 subjects achieves 81% power to detect a linear trend using a two-sided Z test with continuity correction and a significance level alpha of 0.05.

Randomization Randomization will be implemented using Research Randomizer (Urbaniak, G. C., Plous, S. (2011). Research Randomizer (Version 3.0) [Computer software]) Data for randomization was retrieved on September 25th, 2011, from http://www.randomizer.org. Three treatments will be randomized for 50 reps (totaling 150 patients) Analysis of the samples Statistical analysis will be performed by Patrick Haentjens (Uz Brussel, Laarbeeklaan 101 1090 Jette; tel 024777909) Statistical analysis Data will be presented as number of cases including nominator and denominator values (and percentages) for categorical variables and as mean values and standard deviation (SD) for continuous variables. Differences between treatment arms will be presented as absolute between-group differences with corresponding 95% confidence intervals (95% CI). Differences between treatment arms will be assessed by one-way ANOVA for continuous variables and the test for trend in proportions for categorical variables. All tests will be two-sided, and a P-value of less than 0.05 will be considered to indicate statistical significance.

Quality control and quality assurance Continuous ad-hoc analysis of clinical results and of data acquisition and data management will take place in a weekly meeting with all cooperating neurosurgeons; this clinical analysis is independent of statistical analysis. In case of aberrant results from one procedure or another, results will be evaluated and measures will be taken.

• Study Type: Interventional
• Enrollment (Actual): 250
• Phase: Not Applicable

Contacts and Locations

Study Locations

• Belgium
  • Jette, Belgium, 1090
    • Universitair Ziekenhuis Brussel

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

Description

Inclusion Criteria:

• All consecutive patients with chronic subdural hematoma with indication for surgical intervention: clinical symptoms as a result of the subdural collection, or important mass effect (as indicated by a midline shift of more than 5mm)

Exclusion Criteria:

• Patients under the age of 18 will be excluded
• Patients who have undergone previous cranial surgery which would limit surgical options (for example bone flap already in place)

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Randomized
• Interventional Model: Crossover Assignment
• Masking: None (Open Label)

Number of Arms

3

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Active Comparator: Mini-craniotomy; Intervention: Bone flap > 30mm and replaced, placement of Jackson-Pratt drain A linear incision located over the biggest bulk of the hematoma is made. Dura is opened and a wide opening of the pseudomembrane is done. A closed system subdural drain (Jackson-Pratt catheter) is inserted after irrigation until clear liquid return	Procedure: Mini-craniotomy; chronic subdural hematoma evacuation through minicraniotomy
Active Comparator: Twist Drill Craniostomy; Intervention: twist drill burr hole <5mm, placement of Integra basket-type drain A stab incision to the scalp is made, at the approximate location of the thickest diameter of hematoma. The twist-drill hole <5mm is placed obliquely to the surface of the skull, at an angle of about 45° until perforation of the dura. No irrigation is performed. A basket-type drain (Integra) is placed in the subdural space and tunneled underneath the skin	Procedure: Twist Drill Craniostomy; chronic subdural hematoma evacuation through twist drill craniostomy
Active Comparator: Burr Hole Craniostomy; Intervention: 2 Burr Holes >5mm and <30mm, placement of Jackson-Pratt drain First burr hole at the site of maximal diameter, second anterior and superior to that point. The scalp incisions are so planned that they can be incorporated into a craniotomy if necessary. Visible membranes are opened with a sharp hook until the pia is visualized. Gentle irrigation is performed and continued until the returning liquid is clear. Two burr holes are placed to facilitate drainage. A closed system subdural drain (Jackson-Pratt catheter) is inserted after irrigation until clear liquid return	Procedure: Burr Hole Craniostomy; chronic subdural hematoma evacuation through burr holes

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Reoperation rate	The 30 day reoperation rate (number of patients reoperated for recurrence or persistence of chronic subdural hematoma) is the primary endpoint	30 days

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Mortality	Mortality	6 months
Complications	Medical and surgical complications during the patient's hospital stay will be registered.	From the moment of hospitalisation till the moment of discharge, an expected average of 2 weeks
duration of operation	duration of operation in minutes	assessment on the day of the surgery; the time duration in minutes from incision (start of the surgery) to finished suturing (end of the surgery) (skin tot skin) is noted
technical difficulties during operation	technical difficulties will be assessed by the operating surgeon (yes/no followed by a description of the encountered difficulties)	during operation (from incision to finished suturing)
Duration of hospital stay	Duration of hospital stay in days	Number of days the patient is hospitalized after the operation, before he is being discharged home or to a rehabilitation center, an expected average of 2 weeks
Improvement of Clinical status and speed thereof	Patients will be followed for six months postoperatively. Improvement of clinical status will be recorded by registering the Markwalder scale preoperatively, at discharge, at six weeks and at six months postoperatievely. Speed of improvement will be recorded as the first moment where the highest score on the clinical outcome scale has been reached	6 months
Improvement of Clinical status and speed thereof 2	Patients will be followed for six months postoperatively. Improvement of clinical status will be recorded by registering the Modified Rankin scale preoperatively, at discharge, at six weeks and at six months postoperatievely. Speed of improvement will be recorded as the first moment where the highest score on the clinical outcome scale has been reached	6 months
Improvement of CT-imaging characteristics (Measurement of the largest diameter of the subdural hematoma)	preoperatively, two days postoperatively, at discharge, at six weeks and at six months postoperatively.	6 months

Collaborators and Investigators

• Sponsor: Universitair Ziekenhuis Brussel
• Investigators: Principal Investigator: Johnny B Duerinck, MD PhD, Universitair Ziekenhuis Brussel - Neurosurgery Department

Publications and helpful links

General Publications

• Duerinck J, Van Der Veken J, Schuind S, Van Calenbergh F, van Loon J, Du Four S, Debacker S, Costa E, Raftopoulos C, De Witte O, Cools W, Buyl R, Van Velthoven V, D'Haens J, Bruneau M. Randomized Trial Comparing Burr Hole Craniostomy, Minicraniotomy, and Twist Drill Craniostomy for Treatment of Chronic Subdural Hematoma. Neurosurgery. 2022 Aug 1;91(2):304-311. doi: 10.1227/neu.0000000000001997. Epub 2022 May 24.

Study record dates

Study Major Dates

• Study Start: January 1, 2012
• Primary Completion (Actual): October 1, 2019
• Study Completion (Actual): March 1, 2020

Study Registration Dates

• First Submitted: December 9, 2014
• First Submitted That Met QC Criteria: January 11, 2016
• First Posted (Estimate): January 14, 2016

Study Record Updates

• Last Update Posted (Actual): May 19, 2020
• Last Update Submitted That Met QC Criteria: May 18, 2020
• Last Verified: May 1, 2020

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Pathologic Processes; Cardiovascular Diseases; Vascular Diseases; Cerebrovascular Disorders; Brain Diseases; Central Nervous System Diseases; Nervous System Diseases; Wounds and Injuries; Hemorrhage; Craniocerebral Trauma; Trauma, Nervous System; Intracranial Hemorrhages; Intracranial Hemorrhage, Traumatic; Hematoma; Hematoma, Subdural; Hematoma, Subdural, Chronic
• Other Study ID Numbers: UZB-CSDH-1