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Biomedical subjects

J J Merland

Publications and source records attributed to J J Merland.

At least 307 records · Page 17Linked to original sources
PubMedDate not supplied

The use of detachable balloons in neuroradiology.

The development of the detachable balloon allows treatment of many neurological lesions, both congenital and acquired. We describe here a device that may be used easily. Complications and main indications are discussed on the basis of our experience with 114 cases.

Adult↗
PubMedDate not supplied

Arteriovenous fistulae of the internal iliac vessels.

Seven patients with arteriovenous fistulae of the internal iliac artery are reported. Ages varied from 6 to 50 years (mean 32 years). Cutaneous angiomata , leg oedema and pain was present in 4 cases each, bleeding in 2 cases whilst only one was asymptomatic. Only 1 patient had cardiac insufficiency. In six patients the lesion was a congenital malformation but in one it was posttraumatic. Arteriography both global and selective, intravenous pyelography and cardiac output are routine. Recently, pelvic computerised tomography has been most helpful. Embolization is recommended in all cases with surgery within 24 hours unless the lesion is very extensive and considered to be inoperable. Repeat embolization is used for recurrence or very extensive lesions. Results were good in five patients; in two patients the results were clinically good but control angiograms showed a recurrence.

Adult↗
PubMedDate not supplied

[Cervico-cephalic vascular malformations. Current treatment protocol. Apropos of 230 cases].

In the light of 230 cases of vascular malformations in the cervico-facial region and the scalp treated over a 7 year period, the value of embolization is specified. Embolization permits effective treatment of the complications of these lesions, in particular haemorrhage. The reduction of swelling that can be obtained is always marked, but often incomplete : this is largely due to an associated hypertrophy of the neighbouring nonangiomatous tissues : such hypertrophy most often necessitates plastic surgery in order to obtain complete correction of the local disfigurement. With the introduction of embolization, the scope for surgery has been radically transformed, and one can often now consider a complete eradication of an extensive vascular malformation as well as correction of the associated local tissue dystrophy.

Angiomatosis↗
PubMedDate not supplied

[The risk of ligation of the external carotid in the treatment of cervico-facial angiodysplasia. A plea for this technique to be abandoned, and current radiosurgical solutions; based upon 13 cases of ligation amongst 200 angiomas explored (author's transl)].

After describing the different collateral sytems between the various cervicocephalic arteries, the authors indicate the consequences of ligation of the external carotid. This ligation proves to totally ineffective for distal vascular lesions and severely compromises the possibilities of later treatment.

Carotid Arteries↗
PubMedDate not supplied

Percutaneous transvenous embolization through the thrombosed sinus in transverse sinus dural fistula.

Each of two patients presented with a dural arteriovenous fistula involving the transverse sinus. The sinus was thrombosed proximal and distal to the dural arteriovenous fistula with the venous drainage being retrograde through cortical veins. An ipsilateral percutaneous transjugular approach was used in both cases and allowed recanalization of the thrombosed sinus and embolization of the dural arteriovenous fistula with coils. Complete cure was achieved in one patient and 95% reduction in arteriovenous shunting including elimination of the cortical venous reflux in the other. This technique avoided surgical exposure of the sinus.

Aged↗
PubMedDate not supplied

Spontaneous disappearance of a spinal dural arteriovenous fistula.

A case of proved regression of an asymptomatic dural arteriovenous fistula is reported. At the time of diagnosis, myelography showed dilated perimedullary veins. Angiography demonstrated a radicular outflow from these veins to the epidural plexus. A follow-up angiogram 5 years later was normal.

Angiography↗
PubMedDate not supplied

MR manifestations of subependymomas.

PURPOSE: To provide a description of the MR and enhanced MR appearances of subependymomas. METHODS: We reviewed the MR examinations of eight cases of pathologically proved subependymomas and correlated them with operative and pathologic reports, and also reviewed the previous published cases of subependymomas documented by MR. Gadopentetate dimeglumine-enhanced MR examination was performed in seven cases. RESULTS: One patient presented with four subependymomas, two patients had subependymomas of the cervical spine, and the others were intraventricular with no transependymal extension. They were isointense to hypointense relative to normal white matter on T1-weighted images, heterogeneous in five cases. Minimal (n = 1) or no (n = 3) enhancement was noted in four cases, and moderate or marked enhancement was noted in three cases. CONCLUSION: We conclude that even though there is no specific sign of subependymomas, when confronted with a complete intraventricular lesion or with a spinal lesion causing little or no edema which is minimally enhancing or nonenhancing, one must consider the diagnosis of subependymoma.

Adolescent↗
PubMedDate not supplied

Comparative viscosity and erythrocytes disaggregation shear stress of blood-radiographic contrast media mixtures in three mammalian species.

We compared blood viscosity and red blood cells (RBC) disaggregation shear stress in three mammalian species (humans, pigs and sheep) before and after adding water-soluble iodinated contrast media (CM): Ioxaglate (ionic CM) and Iopromide (non ionic CM). The two CMs had a diluting effect on the blood of the three species, which resulted in a viscosity decrease at all shear rates. However, viscosity rose slightly at low shear rates (in relation to increase of RBC aggregation) and low CM concentrations (10%), regardless of the ionic or non ionic nature of the CM. The two CMs had a similar proaggregant effect in human and pig's bloods. The proaggregant effect was slightly more pronounced with the ionic CM. We concluded that the pig is more suitable than the sheep for in vivo assessment of blood/CM mixture.

Animals↗