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Biomedical subjects

P E Ades

Publications and source records attributed to P E Ades.

8 recordsLinked to original sources
PubMed1993

Postoperative assessment of cerebral blood flow in subarachnoid haemorrhage by means of 99mTc-HMPAO tomography.

Regional hypoperfusion is a very frequent complication of subarachnoid haemorrhage (SAH), being related to vasospasm in the majority of cases. Twenty-six patients who were admitted for SAH underwent follow-up with technetium-99m hexamethylpropylene amine oxime single photon emission tomography (SPECT) 3 and 8 days after surgery. Fifteen patients of these had one more examination 15 days after surgery. The degree of hypoperfusion was quantified using an index of asymmetry which allow the comparison of two symmetrical regions of interest (ROIs) on the transaxial slice which presented the greatest perfusion defect. Comparison of CT data, transcranial Doppler data and clinical signs with the perfusion as quantified by 99mTc-HMPAO SPECT indicates that a difference in counts of less than 10% between the two symmetrical ROIs is of no diagnostic value. Follow-up of the brain perfusion clearly shows that the most pronounced hypoperfusion was observed just after surgery, with progressive normalization at 8 and 15 days after surgery. 99mTc-HMPAO SPECT performed 8 days after surgery allows prediction of the clinical outcome. For these reasons, 99mTc-HMPAO SPECT, which is the only method for follow-up of cerebral perfusion in routine clinical practice, should be the first examination to be performed after surgery in patients with SAH.

Brain↗
PubMed1990

[Peroperative aneurysmal rupture: role and consequences of temporary clamping].

Intraoperative rupture of a cerebral aneurysm is not always controlled by anaesthesiological and surgical methods. Its frequency is about 7 to 36% of procedures. Prevention by induced hypotension is by itself a factor of morbidity since regional circulatory disturbances are issued from subarachnoid hemorrhage (hypovolemia, dysautoregulation, vasospasm...). Temporary clipping of aneurysm adjacent arteries is a feasible method of preventing rupture, also during microsurgical management of some dangerous localizations as anterior communicating artery or basilar artery. Clinical course improves with prepared clipping, early methods for cerebral protection, and preventing microcirculatory disturbances during occlusion and blood flow restoration. Unusual anaesthesiological means, hemodynamic and hemorheological supports are required for these purposes.

Anesthesia↗
PubMed1989

[Otoneurosurgery in the elderly].

An oto-neuro-surgical experience on patients older than 65 years is reported. 25 patients have been operated: 9 meningiomas, 5 trigeminal neuroglia, 2 vestibular neurectomies, 9 acoustic neuromas. The assessment, the indication, the surgical techniques are discussed. Are also evaluated the anesthetic technique, the patient drugs, position, and the post-operative survey.

Aged↗
PubMed1989

[Intravenous nimodipine in the treatment of cerebral vasospasm following subarachnoid hemorrhage caused by aneurysm rupture: a comparative multicenter study].

The efficacy of intravenous Nimodipine (used at the rate of 2 mg.h-1) was investigated in the treatment of delayed ischemic deterioration or angiographic vasospasm after subarachnoid haemorrhage caused by a ruptured aneurysm in a randomized, double-blind, placebo-controlled multicenter study. A total of 127 case reports was validated: 73 patients received Nimodipine, 54 received placebo. The two groups were comparable in demographic and clinical status data. Analysis of number of deaths and of patients with severe deficit related to vasospasm alone showed a significant statistical difference (Nimodipine = 19%; Placebo = 49%; p = 0.01). The risk of mortality connected with vasospasm was reduced by 82% in the treated group. Side effects were equally frequent in the two groups. The only difference noted was the increase in heart rate in group Nimodipine. The results of this study demonstrate the efficacy of intravenous Nimodipine in the treatment of consequences of cerebral vasospasm after a subarachnoid haemorrhage caused by a ruptured aneurysm.

Adult↗
PubMed1989

[Does nimodipine improve the outcome of perioperative complications of aneurysm rupture? Results of systematic treatment].

Morbidity after aneurysmal subarachnoid hemorrhages is proceeding from many factors; ischemic etiology is underestimated and frequently thought to be vasospasm related only. Other undoubted mechanisms are in the setting of ischemic disorders after ruptured aneurysms. The management of these disorders is relevant of new calcium blockers. Early administration of prophylactically oral nimodipine, with temporary intravenous administration of the therapy after surgery or in the setting of delayed ischemic deterioration, were assigned to 36 patients with aneurysm surgery. Efficacy was judged on prevention and outcome of ischemic disorders at discharge and three months later using the Glasgow Outcome Scale. On all, twenty-nine patients were disabled from any etiology; twenty made full or improved recoveries at discharge; twenty-eight get independent conditions of life at 3 months. Fourteen patients have return to their pre-rupture activity. Twenty-two surgical patients (61%) set an undoubtly ischemic disability during any time of their hospitalization, but many etiologies were identified in majority of cases. Spasm is the main factor of stroke in only 6 patients, and one of the ischemic factors in 15 cases. Among these ischemic deteriorations, twenty improved or made full recovery at discharge and get independent life at 3 months. No death with spasm. These data support the assumption that vasodilatating is not the only mode of nimodipine action. Hypervolemia must be adjunct with nimodipine to prevent regional hypoperfusion.

Adolescent↗
PubMed1987

[Rupture of a cerebral aneurysm and pregnancy: apropos of a case of neurosurgical intervention during pregnancy].

The authors report a case of an aneurysm of the posterior cerebral artery that was operated on after 28 weeks of amenorrhoea without any sequelae for the mother or the fetus. The article gives precise details of the neurosurgical procedures carried out in this pregnant woman and how and what neurosurgical anaesthesia was administered while the aneurysm was cured and the pregnancy continued. Finally the obstetrical and neurosurgical care is discussed. The neurosurgeons decided on the operation in view of the neurological findings. Once the neurosurgical decision has been made, the obstetrical procedures depend practically on the length of amenorrhoea. Briefly, we would suggest the following: before 31 weeks of amenorrhoea: curing the aneurysm and going on with the pregnancy; after 32 weeks of amenorrhoea: first to carry out a caesarean section and during the same operation to treat the vascular malformation.

Adult↗