The results of this study involved 326 patients hospitalized for a surgical condition, of which 41.7% (n = 136) were neurosurgery patients. TBIs accounted for 32.8% (n = 107), representing 78.7% of the neurosurgery patients. The average age of the patients was 32.4 ± 19.98 years, with a range from 3 months to 88 years. The average age of TBI patients was 27.1 ± 17.2 years, with a range from 1 year to 80 years. The most represented age group was [20 - 39] years (41.1%). Male patients represented 82.35%, and the sex ratio was 3.2 M/F. The TBI patients comprised 95 (88.8%) men and 12 (11.2%) women, with a sex ratio of 7.9.

Regarding bed occupancy, the average number of admissions per week is 25.1 ± 8.37 patients, with a range from 16 to 46 patients. Peaks in admission frequency were observed in the first, second, eighth, and eleventh weeks, as reported in Figure 1 .

The average number of admissions per week for patients with neurosurgical conditions is 10.5 ± 3.2 patients, with a range from 5 to 16 patients. During the study period, a total of 2750 hospitalization days were recorded, of which 1029 hospitalization days were in the neurosurgery unit.

The surgery department had 35 beds, and the occupancy rate was 87.3%, which translates to 31 functional beds. Of these 31 beds, the occupancy rate for neurosurgery patients was 36.9%, meaning a total of 12 out of 31 beds were occupied by neurosurgery patients, even though initially only 7 beds were dedicated to this neurosurgery unit. Figure 2 illustrates this bed occupancy.

The weekly evolution of bed occupancy rates by specialty is shown in Figure 3 . The peaks in bed occupancy rates were observed during the first week (180.8%), the second (112.2%) and the fourth week (104.5%).

The hospitalization days recorded for TCE were 689 days. The neurosurgery unit had 7 beds. The average occupancy rate of the neurosurgery unit beds was 163.3%, i.e., 5 beds from other specialties occupied by neurosurgery patients. The average occupancy rate of the neurosurgery unit beds by TCE patients was 109.4%. This distribution is shown in Figure 4 .

Peak bed occupancy rates per week in the neurosurgery unit were observed in the first week (228.6%), the third week (302.0%) and the eleventh week (302.0%) as reported in Figure 5 .

The mean hospital stay was 8.4 ± 8.9 days with extremes of 1 and 68 days. Patients with neurosurgical pathology had a mean hospital stay of 7.6 ± 7.7 days with extremes of 1 and 61 days.

Patients were referred in 56.1% of cases. Intern trainees received patients in 100% of cases under the supervision of a graduate in neurosurgery specialty (DES). Admission time ranged from 15 minutes to 60 days, with 55.1% of patients admitted within the first 6 hours following the injury. The average time to provide emergency care was 0.25 ± 1.4 hours, with extremes of 15 minutes and 10 hours.

The average emergency room stay was 0.5 ± 1.1 days, with a range of 1 to 7 days.

The specialist’s opinion was obtained directly in 15% of cases and by phone in 85% of cases. The average time for obtaining this opinion was 0.7 ± 4.7 hours, with extremes ranging from 20 minutes to 48 hours. In 86% of cases, the specialist's opinion was obtained within the first hour following the patient’s admission. The time taken to obtain the specialist’s opinion was not significantly associated with the TBI classification according to Masters (p-value = 0.872). The time to obtain the specialist’s opinion was not significantly associated with the time taken to perform the CT scan (p-value = 0.854). The time taken to perform the CT scan was significantly associated with the TBI classification according to Masters (p-value = 0.016). Among the patients who had a CT scan performed within the first 24 hours, 65 (85.5%) were classified as Masters III.

Care was administered within less than one hour after hospitalization in 88.8% of cases. Surgery was indicated for 25 patients (23.4%), but 23 patients (21.5%) were actually operated on. No perioperative complications were noted. Table 1 shows the distribution of surgical procedures performed.

Table 2 reports the distribution of patients according to complications.

Twenty-two patients died (20.6%), of whom 51.7% had a severe TBI.

Twenty-six patients underwent a clinical follow-up, accounting for 24.3%. Complaints at follow-up included headaches (2.8%), rhinorrhea (0.9%), and aphasia (0.9%).

Seventy patients, or 65.4%, expressed their satisfaction at discharge, as reported in Table 3 .

TBI cases accounted for 32.8% of patients hospitalized in the surgery department. This result is identical to that of Fatigba et al. [7] in 2010 in a study conducted at CHUD/B in Parakou, which reported a rate of 31.9%. TBI patients represented 78.7% of those hospitalized for a neurosurgical condition.

The average age of TBI patients was 27.1 ± 17.2 years, with a range from 1 year to 80 years. Some authors have reported average ages similar to our series [10] [11] , while others reported average ages of 39 years and 31.4 ± 2 years, which are higher than those in our series [12] . The most represented age group in our series was [20 - 39] years. Young people are therefore the most affected due to their high mobility.

Male predominance has been reported in the literature as in our series, at a proportion of 88.8%. The sex ratio in our series was 7.9 M/F, which differs from those found by other authors [7] [8] [11] . These findings are related to the socio-professional activities of men, which expose them to traumatic brain injuries more than women.

The risks of bed shortages become apparent when the average bed occupancy rates exceed 85%, and a hospital can expect regular bed shortages and periodic bed crises if the average bed occupancy rises to 90% or more [13] . This statement is supported by the Australian Medical Association [14] , the Irish Medical Organization, and the Australasian College for Emergency Medicine in 2010 [15] . In the United Kingdom, the National Institute for Health and Care Excellence (NICE) in 2018 recommended that healthcare providers plan their capacity to limit the risks associated with an occupancy rate exceeding 90% [16] [17] . In our study, the average bed occupancy rate in the surgery department is 87.3%. This average occupancy rate is above 85% and explains the bed shortages the department often faces. These results are similar to those reported by other authors, even though some found lower average bed occupancy rates than those in our series, ranging from 66.5% to 51.7% [18] - [20] .

In our series, the weekly evolution of the bed occupancy rate showed that for 6 out of 13 weeks, this occupancy rate was above 85%. This aspect has not been addressed in the literature, but it reveals the extent of the bed shortage crisis in our study. In the neurosurgery unit, the average bed occupancy rate is 163.3%, while some authors reported an average occupancy rate of 87% in France [13] .

This difference is because these authors conducted their study in a neurosurgery department with a higher capacity than ours. The weekly evolution of the neurosurgery bed occupancy rate showed that for 12 out of 13 weeks, this occupancy rate was above 85%, ranging from 46.9% to 302.0%. This proves that the neurosurgery bed shortage is a constant problem and explains the long waiting times observed in the emergency department for TBI patients in our series, which was 0.5 ± 1.1 days, with extremes ranging from 3 hours to 7 days.

Regarding the bed occupancy rate by traumatic brain injury patients in the departments, the literature remains silent, but in our series, it averaged 109.4% in the neurosurgery unit.

In our series, the average weekly admissions in neurosurgery were 10.5 ± 3.2, with a range of 5 to 16 patients, which was different from these results. Admissions were direct in 43.9% of cases, compared to 56.1% that were referrals, contrary to direct admissions in 70% of cases [10] . This difference in our study could be explained by the fact that CHUD-B is the reference hospital in the northern region and the only one offering specialized neurosurgery services.

Recommendations call for the management of TBIs by a specialized and trained team upon admission. In our series, interns handled patient admissions in 100% of cases. The difference in our study is the supervision by a DES neurosurgery trainee. The admission delay ranged from 15 minutes to 60 days, with 55.1% of patients admitted within the first 6 hours following the trauma. These results are identical to those reported in other studies [21] [22] , whereas the very long average delay was 66 ± 108.02 hours at CNHU/HKM in Cotonou due to patients being routed through a healthcare center before being referred to CNHU/HKM [10] .

The average stay in the emergency department, which reflects the waiting time for hospital beds, was 0.5 ± 1.1 days, with extremes ranging from 3 hours to 7 days. This delay is very long compared to what has been reported by other authors [6] [23] [24] , which was 11 ± 5.7 hours, with extremes of 2 and 24 hours. This is primarily due to the lack of available hospital beds.

The specialist’s opinion was obtained within an average time of 0.7 ± 4.7 hours, with extremes ranging from 20 minutes to 48 hours. In 86% of cases, the specialist's opinion was obtained within the first hour following patient admission, contrary to some authors who reported an average delay of 12 ± 11.5 hours, with extremes of 5 minutes to 6 days [7] [10] . The reason given in their study was the reluctance of interns to call the supervisors. In our study, the presence of the DES neurosurgery trainee facilitated quick consultation with the specialist.

A non-contrast brain CT scan was performed in 81.3% of cases. This rate of brain CT scan performance is higher than that reported by other authors [6] [9] [19] . The average time to perform the brain CT scan was 10.8 ± 17 hours, with extremes ranging from 1 to 72 hours. This delay is significantly shorter than that reported in the literature [7] [10] [12] . The shorter delay in our series can be attributed to the 24/7 availability of the brain CT scanner at two peripheral centers (Hôpital d’Instruction des Armées de Parakou and Centre de Diagnostic Médical Sancta Maria), but the cost remains a burden for the patient and family due to a lack of financial resources.

The simple skull X-ray is unnecessary in brain trauma patients as it does not predict the presence or absence of brain lesions. In some series from developing countries, emergency CT scans are performed in proportions ranging from 33.7% to 61% [7] [10] [12] . These results are significantly higher than in our series, which was 0.9% (only 1 case). This difference was due to the inaccessibility of the CT scanner and the lack of financial means.

Neurosurgical treatment (evacuation of EDH, evacuation of ASDH, evacuation of chronic SDH, elevation of depressed skull fracture, repair of CSF leak, or repair of the anterior cranial fossa) was performed on 23 patients (21.5%) in our series. This rate of surgical treatment could be explained by the lack of financial resources of some patients, as they do not have health insurance for systematic coverage when care is needed. This difficulty is reported by other authors working in conditions similar to ours [7] - [10] [12] [22] . The average delay for surgical intervention was 125.2 ± 156.3 hours, with extremes ranging from 4 to 528 hours (9 days).

The average hospital stay was 6.5 ± 7.0 days, with extremes ranging from 1 to 45 days, similar to what some authors have reported [7] [9] [12] .

In terms of nursing care, in a previous study conducted in the same department in 2020, the current results are very encouraging and explain the low rates of complications, especially infections, and the absence of pressure sores [8] . Nursing care generally includes body hygiene, bed care, early and periodic mobilization, propped-up positioning, early feeding via nasogastric tube for severe TBI patients, and physiotherapy started in the hospital ward in cases of motor deficits. Caregivers are trained and supervised in these practices due to staff shortages.

The overall mortality in our series was 20.6% of patients. This is higher than what is reported in some publications [7] [8] [11] [12] , which had mortality rates ranging from 8.5% to 20%. Patients with severe traumatic brain injury accounted for 51.7% of our mortality. The main reason for this high death rate is the inadequacy of technical facilities.

Out of the 70 patients who expressed their overall satisfaction with the care received, 72.9% were satisfied. This satisfaction level is higher than that reported in a study conducted at the Comè Zone Hospital in Benin, which was 41.1% [23] [24] .

Based on these different results, the quality of care for traumatic brain injury patients has been assessed according to the following criteria:

These results align with the literature, where healthcare often yields satisfaction when standards are met, despite limited technical facilities [26] - [32] .