Acta neurochirurgica
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Acta neurochirurgica · Jan 1994
Comparative Study Clinical Trial Controlled Clinical TrialFavourable influence of opening the lamina terminalis and Lilliequist's membrane on the outcome of ruptured intracranial aneurysms. A study of 197 consecutive cases.
Opening of the lamina terminalis and Lilliequist's membrane--by facilitating CSF circulation in the basal cisterns--favourably influences the outcome in patients with ruptured intracranial aneurysms. This has been demonstrated by the analysis of a series of 197 consecutive cases of ruptured intracranial aneurysms.
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Acta neurochirurgica · Jan 1994
Bovine bone grafting in occipito-cervical fusion for atlanto-axial instability in rheumatoid arthritis.
Bovine bone chips (Surgibone) were used in occipito-cervical fusion in nine patients with atlanto-axial instability due to rheumatoid arthritis. The patients were examined with CT 12-15 months after surgery. Graft resorbtion was observed in one patient. ⋯ One patient was revised, and at the grafted site a bony bridge was found. In conclusion, the use of bovine chips in posterior occipito-cervical fusion will not lead to predictable bone union. However, there seem to be exceptions to that rule.
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Acta neurochirurgica · Jan 1994
Intracranial meningiomas: analysis of recurrence after surgical treatment.
Recurrence of intracranial meningiomas after surgery has long been recognized, but there is still no consensus about factors responsible for recurrence. To better understand such factors, we analysed data on 276 patients with meningiomas who were treated at our institution from 1976 to 1990 (mean follow-up = 5.1 years). Effects of sex, tumour histology, tumour site, and radiotherapy on recurrence were closely studied. ⋯ We found that radiotherapy did not decrease "recurrence" or "regrowth" regardless of when administered, either at first resection or on recurrence. This was true for benign as well as malignant meningiomas. However, due to the small number in our series, we cannot conclude that radiotherapy has no beneficial role in the treatment of meningiomas.(ABSTRACT TRUNCATED AT 250 WORDS)
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Acta neurochirurgica · Jan 1994
Cause, distribution and significance of episodes of reduced cerebral perfusion pressure following head injury.
A group of 74 patients with head injury (54 severe, 17 moderate and 3 minor) had continuous monitoring of both arterial and intracranial pressure with computer-based registration of these pressures, cerebral perfusion pressure and other variables. In 60 patients cerebral perfusion pressure CPP fell below 60 mm Hg for periods of 5 minutes or longer. ⋯ There was a significant correlation between low CPP due to reduced arterial pressure and the Injury Severity Score (p < 0.001), suggesting that resuscitative measures may have been less than optimal in these cases. There was also significant correlation between the duration of low CPP and low arterial pressure and an adverse outcome from injury as assessed at 6, 12 and 24 months after injury (p < 0.001).(ABSTRACT TRUNCATED AT 250 WORDS)
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Acta neurochirurgica · Jan 1994
Facial motor responses evoked by direct electrical stimulation of the trigeminal root. Localizing value for radiofrequency thermorhizotomy.
In Sweet's description of RF-thermocoagulation for trigeminal neuralgia, the trigeminal nerve was stimulated at 50 c/s to evoke paraesthesias, in order to check the electrode location before the thermolesion is made. In 1979, we changed the frequency to 5 c/s, so as to produce in addition twitches in the masticatory muscles (in stead of the less detectable tetanization produced by 50 c/s stimulation). Since then, we started to observe, also, twitches in the muscles innervated by the facial nerve. ⋯ So, getting EMR in the territory of the pain can be a helpful indicator for an accurate location of the electrode in the trigeminal root, according to its somatotopic organization. These EMR are hypothesized to be due to a trigemino-facial reflex. A preliminary intra-operative EMG study clearly shows that for EMR in the upper part of the face we are dealing with blink-like reflexes, whilst for EMR in the lower face, mechanisms still remain unclear and need further study to be understood.