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Biomedical subjects

D G Shanik

Publications and source records attributed to D G Shanik.

34 records · Page 2Linked to original sources
PubMed1978

Transcatheter embolisation of bone tumour arteriovenous malformations.

Arteriovenous malformations complicating benign bone tumours may not be amenable to surgical treatment either because of their extensive size and likelihood of recurrence or because of their location. Transcatheter embolisation may then be used either as the definitive treatment or as a prelude to safe surgical intervention. Patients presenting with arteriovenous malformations in association with polyostotic fibrous dysplasia and vertebral haemangioma are presented who were treated by transcatheter embolisation, using Oxycel and Gelfoam. A haemodynamically significant shunt was obliterated in one patient and in the other an excellent clinical response was obtained facilitating subsequent surgical management.

Adult↗
PubMedDate not supplied

Can pre-operative duplex scanning replace pre-operative short saphenous venography as an aid to localizing the sapheno-popliteal junction?

The accuracy of Duplex ultrasound scanning in locating the sepheno-popliteal junction (SPJ) was assessed by comparison with clinical examination and short saphenous venography. Twenty-three legs with varicosities of the short saphenous system had their SPJ located by Duplex scanning and marked pre-operatively. Varicography was performed on all patients. Clinical examination localised the junction to within 2 cm in 8/23 (37%) compared to 16/23 (74%) for Duplex ultrasonography and 21/23 (93%) venography. Ihis study shows that Duplex ultrasonography while more accurate than clinical evaluation, should not replace venography in the pre-operative localisation of the SPJ.

Humans↗
PubMedDate not supplied

Stenosis following carotid endarterectomy.

Carotid endarterectomy is well established in the treatment of selected cases of atherosclerosis of the carotid bifurcation but the incidence of restenosis is unknown. During a four year period 80 endarterectomies of the internal carotid artery were performed in 73 patients. Post-operatively we studied our patients prospectively by means of Doppler ultrasound in combination with real time spectral analysis and where indicated digital venous angiography to determine the incidence of restenosis. We report a 12.5% incidence of stenosis following carotid endarterectomy with a 1% incidence of symptomatic restenosis. We therefore question the role of carotid endarterectomy in the treatment of asymptomatic carotid stenosis.

Aged↗
PubMedDate not supplied

Carotid ultrasonic arteriography combined with real time spectral analysis: a comparison with angiography.

In a one year period, 400 patients were examined by carotid ultrasonic arteriography combined with real time sound spectral analysis. Contrast arteriography was performed on 112 patients. The noninvasive examinations and contrast arteriograms of these patients were reviewed by two independent observers, who were unaware of the findings of the other diagnostic modality. There were 190 vessels available for comparison. The internal carotid artery was classified as normal, less than 50% stenosis, greater than or equal to 50% stenosis, or occluded. The specificity of these non-invasive tests was 79%. The sensitivity in correctly identifying stenoses as less than 50% or greater than or equal to 50 was 85% and 91% respectively. The sensitivity in identifying occluded vessels was 90%. The positive and negative predictive values were 87% and 92% respectively. Noninvasive evaluation correctly identified six lesions misdiagnosed by arteriography. We found pulsed Doppler arteriography combined with real time spectral analysis to be an accurate, direct, noninvasive method of assessing the extracranial carotid arteries.

Arterial Occlusive Diseases↗