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Biomedical subjects

H Sahl

Publications and source records attributed to H Sahl.

4 recordsLinked to original sources
PubMed1999

[Interventional treatment of arteriosclerotic carotid stenosis].

PURPOSE: Angioplasty and stent placement of atherosclerotic internal carotid artery stenosis (ICA) are evaluated based on own experiences with the method and reports of other groups and are compared with vascular surgery. METHODS: ICA-stenoses of more than 70% were treated by angioplasty and stent placement mainly using the Wallstent. The patients had follow-up examinations with an angiogram after 6 months and colour-coded duplex ultrasound at regular intervals. RESULTS: In 633 patients 799 ICA stenoses were treated, 70% of them were symptomatic and 30% asymptomatic. In 99% of the patients the stenoses could be removed with a reduction of the degree of stenosis from 82% to 12%. Transient neurological deficits occurred in 5% and permanent deficits in 2.7% of the patients with decreasing incidence over the years. Five-year patency was 91.6%. CONCLUSION: Endoluminal treatment of atherosclerotic ICA stenosis is an efficient procedure which can be applied in patients, in whom carotid surgery is indicated, but also in cases with an increased operative risk or inoperability from technical or medical reasons.

Angioplasty, Balloon↗
PubMed1998

[Low-dose computerized tomography of the jaw bone in pre-implantation diagnosis. Limits of dose reduction and accuracy of distance measurements].

Absorbed radiation doses delivered by computed tomography and panoramic radiography were measured in 16 anatomic sites using a head and neck phantom and thermoluminescent dosimetry. The recommended kilovoltage and scan time for dental scanning was reduced step by step, rating the quality of the low-dose scans. A reduction of up to 76% could be achieved without loss of diagnostic accuracy. Measured absorbed radiation dose ranges from 0.30 mGy (thyroid) to 29 mGy (skin) at 187.5 mAs and 1.0 mm-slices (25 mm scanning distance for maxilla, 30 mm for mandible). After reduction to 45 mAs, 0.07 mGy (thyroid) to 6.9 mGy (skin) was measured. Distance measurements on human jaw specimens were compared with corresponding CT image measurements. Average deviation was 0.1-0.3 mm. A dose reduction of 75% had no effect on the results. However, the doses of CT-scans reduced by 76% exceed by an average factor of 10 the doses of conventional panoramic radiography. Therefore, CT should be reserved for the planning of complex implant treatment in the direct vicinity of the maxillar sinus and nerves and for multiple implant insertion.

Body Burden↗
PubMed1993

[Bilateral choroid osteoma].

BACKGROUND: Choroidal Osteoma is a rare, typically monolateral benign ossifying tumor of the choroid found in healthy females aged 10 to 30 years. In contrast, multiple idiopathic sclerochoroidal calcifications occur in elderly otherwise healthy subjects. Local or generalized distortions of calcium phosphate metabolism may cause secondary choroidal calcifications. PATIENT: We report on a 56-year-old woman, who underwent removal of a histologically verified osteoma 2 years ago. Ophthalmoscopically, there were multiple prominent choroidal tumors in the inferior midperiphery of both eyes. Ultrasonography showed high reflectivity and marked shadowing posterior to the lesion. CT-scan demonstrated the presence of calcifications. The patient neither belonged to the age group, in which choroidal osteomas are typically found, nor were the lesions located in the typical manner as reported in literature. The location in the inferior choroid has not yet been described for idiopathic sclerochoroidal calcifications. The presence of secondary choroidal calcifications was very unlikely, as there was no history of ocular inflammation or systemic disease such as hyperparathyreoidism or chronic renal failure. CONCLUSION: Thus, despite the lack of histologic examination, one may assume the rare incidence of bilateral choroidal osteomas in atypical inferior localisation in our patient.

Choroid↗