CLINICAL STUDIES / ETUDES CLINIQUES
A SURVEY OF 371 HEAD INJURED PATIENTS ADMITTED TO THE NEUROSURGICAL WARDS OF THE PARIREWYATWA HOSPITAL, HARARE, ZIMBABWE
A prospective study of all head injured patients who were admitted to the Parirewyatwa Hospital under our care between the months of May 1996 and August, 1997 inclusive was undertaken. The purpose of the study was to document the cause and nature of the injury, the presence of other injuries and their effects, the outcome, to review the post mortem in order to clearly delineate the nature of the intracranial injury, to determine if there were errors in the treatment, to see if there were other ways in which the treatment of the head injuries could be improved.
Une etude prospective a ete conduite chez tous les patients ayant presente un traumatisme cranien, admis dans notre service a 1’Hopital Parirewyatwa entre les mois de Mai 1996 et d’Aout 1997 inclus. Le but de 1’etude etait de rechercher les causes et la nature du traumatisme, la presence d’autres blessures et leurs effects, leur devenir. De plus, les rapports d’autopsies ont ete examines pour rechercher la nature exacte des lesions intracraniennes afin de determiner s’il y avait eu une erreur dans le traitement, et pour rechercher s’il etait possible d’ameliorer les therapeutiques des traumatismes craniens.
Keywords : Head injuries, Critical Review, Treatment, Africa
1. The cause of and nature of the injury.
Road traffic accidents constitued the major incidence. (Table 2):
Admission policy at the Parireyatwa Hospital decrees that head injuries take priority so that a considerable number of patients with other injuries as well as those of the head are brought into our ward. (Table 3):
These figures are not strictly comparable except to suggest that the chances of dying are slightly greater for those with other injuries that with a head injury only, and for those with a head injury it is just over 10% understandably multiple injuries were commonest in the R.T.A. Group.
The patients were classified according to their Glasgow coma scores which were estimated soon after admission to the ward or Casualty Department and it was frequently impossible to determine exactly how long, post injury this was, patients transferred frrom outside the town had the Coma Score assessed by the referring doctor before their departure. The coma score was measured out of 14 and the patients were divided into three groups on that basis. (Table 4):
As would be expected the mortality was highest in the low coma score and lowest in the high coma score groups.
50 patients died overall. 36 of these were the subject of post mortem examination and 5 others had a clear definition of their intracranial status by CT Scanning. Nine patients had neither CT Scan nor autopsy but seven of these had been admitted deeply unconscious and died 48 hours without improvement, so I think we have a fair idea what was going out there.
In group I, where 35 out of 75 patients died, there were three interesting cases:- The patients had normal scans yet they died after four and 21 days, in the third case at autopsy there was only subarachnoid heamorrhage and a very small subdural blood collection and it was difficult to see why these three patients died.
In group II where 10 out of 79 patients died one showed a mild diffuse brain swelling but nothing else, while a second showed small occipital haemorrhage, a small subdural haemorrhage and extensive cerebral oedema. Another patient showed a severe bronchopneumonia with only minor brain change. A fourth patient, a 25 year old male suffered a fractured tibia and fibula as well as a head injury, his conscious level dropped from 14/4 to 9/14 after reduction of the fracture. A Clinical diagnosis of fat embolism was made – post mortem examination confirmed the diagnosis.
Five patients out of 217 died in group III (2.2%) and in some ways these are the most interesting
Three problems seem to arise from this:
(1) Epidural haematoma, provided it follows the classical pattern is very curable if intervention occurs in time. How can this be facilitated? It is clear that simple clinical observation is inadequate in some cases, where there is easy access to a CT Scanner there should be no problem but where there is not some easier and cheaper method must be employed. Early Angiography is one possibly but it needs a reasonable set up and it is invasive. Basically what is needed is a non invasive, non damaging, easily applied test will show the position of the midline of the brain relative to the centre of the skull – where the midline is centrally placed we can be sure there is no surgical lesion. 1 am suggesting that we try to revamp ultrasound scanning which proved it- self most valuable in the past. There was an instrument called the « Midline » which anyone could use and which could accurately locate the midline structures without difficulty or danger. We used it for many years – unfortunately no one in the northern hemispheres makes it now – though I have tried hard to get one made no one will do so because the first world does not want it. I believe that a cheap reliable model could help us tremendously in the third world. One of these machines in each District Hospital could help the resident doctor to decide whether urgent transfer is necessary.
(2) The second point reveals a different aspect of head injury care – that of care of the airway. When I first came into neurosurgery the importance of airway clearance was not appreciated and I have seen patient literally roaring with laryngeal spasm and tracheal mucous. We eventually got the idea that this had to be removed and started to bronchoscope the patients. We then went over to tracheostomy with very gratifying results and later to endotracheal tubing with what I believe, have been less successful results. In a number of the cases reported here there was evidence of inadequate airway clearance. The patient with cardiac tamponade was a surprise.
(3) In six cases the brain injury appeared minimal and at CT Scanning or autopsy various authors have pointed out how trauma, and particular bruising or the brain with haematoma formation and neuron distracted liberates toxic cytokines as well as electrolytes in the extra cellular fluids with resulting brain swelling and dsyfunction. There were more of these cases than those requiring surgery. This means that while we must tighten up on our diagnosis and observations and on our general and especially airways care, it also means that the main focus of our attention has to be on the development of techniques to mitigate the deleterious effects of these liberated substances that has to be the main thrust of head injury research now.