In a radiological study, all the branches of the middle meningeal artery ran posterior to the coronal suture and the vascular grooves were also located posterior to the coronal suture at the level of the superior temporal line (STL). The average distance of the vascular grooves was 8.0 +/-5.8 mm. Thirty-five procedures were performed. The coronal suture and the STL could be identified clearly on brain CT scans. The mean thickness of the skull and the CSDH at the proposed point was 8 mm (range 5-13 mm) and 20 mm (range 10-28 mm), respectively. All the TDCs except 1 were congruent with the preoperative brain CT scans. One CSDH recurred 1 month after the first operation and was revised using the same procedure. No other complications occurred.
One centimeter anterior to the coronal suture at the level of the STL is suitable as the normal entry point of the TDC for symptomatic CSDH. The thickness of the CSDH can be measured at this point on a preoperative brain CT scan. Furthermore, the entry point on the scalp can be accurately estimated using surface landmarks 1).
The insertion of a subdural drain was associated with a statistically significant reduction in the risk of symptomatic recurrence and the requirement for further surgical intervention of chronic subdural hematoma after surgical evacuation. Furthermore, it was associated with statistically significant improvements in both short-term and long-term functional outcome 2).
The Subdural Evacuating Port System (SEPS) is a subdural drain that permits the neurosurgeon to drain subacute or chronic subdural hematoma by a method which is minimally invasive, simple and safe to the standard procedure of burr-hole evacuation 3) 4) 5) 6).
The appearance of the winged canula positioned with its tip in the diploic space overlying the subdural space should allow the radiologist to identify it correctly 7).
Because chronic SDH frequently occurs in elderly patients with multiple comorbidities, the bedside approach afforded by the subdural evacuating port system (SEPS) is an attractive alternative method that is performed under local anesthesia and conscious sedation.
A prospectively maintained database of 23 chronic SDHs treated by bur hole or craniotomy and of 23 chronic SDHs treated by SEPS drainage at Tufts Medical Center was compiled, and a retrospective chart review was performed. Information regarding demographics, comorbidities, presenting symptoms, and outcome was collected. The volume of SDH before and after treatment was semiautomatically measured using imaging software.
There was no significant difference in initial SDH volume (94.5 cm(3) vs 112.6 cm(3), respectively; p = 0.25) or final SDH volume (31.9 cm(3) vs 28.2 cm(3), respectively; p = 0.65) between SEPS drainage and traditional methods. In addition, there was no difference in mortality (4.3% vs 9.1%, respectively; p = 0.61), length of stay (11 days vs 9.1 days, respectively; p = 0.48), or stability of subdural evacuation (94.1% vs 83.3%, respectively; p = 0.60) for the SEPS and traditional groups at an average follow-up of 12 and 15 weeks, respectively. Only 2 of 23 SDHs treated by SEPS required further treatment by bur hole or craniotomy due to inadequate evacuation of subdural blood.
This results means thats a safe and effective alternative to traditional methods of evacuation of chronic SDHs and should be considered in patients presenting with a symptomatic chronic SDH 8).
The SEPS is relatively simple to use and may be especially useful to emergency department staff in outlying areas where there is a shortage of neurosurgical coverage 9).
This technique should be added to the armament of treatment options for a neurosurgeon to treat or temporize a hyperacute SDH with increased intracranial pressure in specific patients 10).
Despite decreasing length of stay LOSs as treatment for cSDH evolved from burr holes BHs to SEPS, the LOS for a cSDH is still longer than that of a patient undergoing craniotomy for brain tumor 11).
The efficacy and safety of SEPS is similar to that of other twist-drill methods reported in the literature. The efficacy of this treatment as measured by radiographic worsening or the need for a subsequent procedure is statistically similar to that of bur hole treatment. There was no difference in mortality or other adverse outcomes associated with SEPS 12).
Specifically, hypodense subdural collections drain more effectively through an SEPS than do mixed density collections. Although significant bleeding after SEPS insertion was uncommon, 1 patient required urgent surgical hematoma evacuation due to iatrogenic injury 13).
The SEPS a first-line treatment for the majority of patients with cSDH, management of cSDH must be tailored to each patient. In mixed density collections with large proportions of acute hemorrhage and in collections with numerous intrahematomal septations, alternative surgical techniques should be considered as first-line therapies 14).