B Schwaighofer

Medical University of Vienna, Vienna, Vienna, Austria

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Publications (71)134.31 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: Two children with clinically suspected renal vein thrombosis were evaluated by duplex Doppler sonography and colour flow imaging. Both cases presented unspecific findings with an enlarged kidney and loss of cortico-medullary delineation on gray-scale ultrasound, but an unusual flow pattern with retrograde plateau-like frequency shifts during diastole. No venous signal could be obtained. By colour flow imaging only the main renal artery and its proximal branches could be visualised with a reverberating oscillation of blood flow. In addition, partial thrombosis of inferior vena cava in one patient and iliac vein thrombosis in the other could be demonstrated. Clinical improvement during fibrinolytic therapy in one case and nephrectomy in the other case confirmed the diagnosis.
    Ultraschall in der Medizin 03/1993; 14(1):40-3. · 4.12 Impact Factor
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    ABSTRACT: Despite progress in ultrasonographic techniques visualisation of the origin of the vertebral arteries, particularly the left, by duplex and colour Doppler imaging, still poses a problem in a significant number of patients. In anatomical and radiological studies we demonstrated an anomalous origin in 6%, the left vertebral artery originating directly from the aorta in most cases. The origin from the subclavian artery was found to be posterior in 44% and inferior in 6%. The V1 segment of the vertebral artery (from its origin to the entry into the foramen transversarium) was tortuous in 47% of cases. These anatomical variants and variations in the course of the vessel contribute to the nonvisualisation of the origin of the vertebral artery by duplex and colour Doppler imaging. With respect to tortuosities technical modifications for better visualisation are suggested and possible implications for surgery are discussed.
    Neuroradiology 02/1993; 35(4):296-9. · 2.70 Impact Factor
  • Ultraschall in Der Medizin - ULTRASCHALL MED. 01/1993; 14(01):40-43.
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    ABSTRACT: In a prospective study 54 patients with 62 saphenous vein arterial bypass grafts were examined by colour-coded Doppler sonography and angiography. Five cases of graft occlusion were diagnosed by colour-coded Doppler sonography and confirmed by angiography. In comparison with angiography, colour-coded Doppler sonography showed a sensitivity of 92% and a specificity of 100% in the detection of focal graft stenosis. Only two stenoses in the region of the distal anastomosis could not be detected by colour-coded Doppler sonography. In 28 cases a marked dilatation of the proximal anastomosis was found corresponding to the surgically used patch angioplasty. Within this dilated bypass segment, turbulence and flow reversal zones were demonstrated, which might be predisposing factors for graft stenosis. Colour-coded Doppler sonography can accurately detect saphenous vein arterial bypass graft stenoses and should be routinely used in postoperative screening.
    Ultraschall in der Medizin 05/1992; 13(2):67-70. · 4.12 Impact Factor
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    Ultraschall in Der Medizin - ULTRASCHALL MED. 01/1992; 13(02):67-70.
  • A Neuhold, M Stiskal, F Kainberger, B Schwaighofer
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    ABSTRACT: As Magnetic Resonance (MR) imaging and Ultrasound (US) allow the evaluation of soft-tissue structures not previously possible with other imaging techniques, a clinical study has been undertaken to determine the value of these two modalities in the detection of lesions in the Achilles tendon (AT), other than acute total rupture. Seven healthy subjects and 28 symptomatic patients with Achillodynia and/or signs of thickening of the AT were investigated with MR and US; all results were compared with the clinical features. Surgical findings were available in 14 patients. The patients were divided into three groups; those with tendon thickening, incomplete and complete chronic ruptures. Thickening of the AT was easily detected with both methods. MR was superior in the detection of incomplete tendon rupture and in the evaluation of various stages of chronic degenerative changes. We conclude that only if US remains unclear, an additional MR study should be performed and together with the clinical diagnosis indication for surgery can be made more efficient.
    European Journal of Radiology 01/1992; 14(3):213-20. · 2.51 Impact Factor
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    ABSTRACT: Three patients with intermittent exophthalmos were studied by computed tomography (CT) and colour-coded Doppler sonography (CCDS). By CT the possible diagnosis of an orbital varix was established. CCDS, however, with the dynamic evaluation and realtime direct imaging of flow and the possibility of examination in different positions facilitated the diagnosis of this orbital vascular disorder without the need for any contrast material. This technique may prove to be a useful adjunct to computed tomography for the evaluation of suspected vascular lesions of the orbit. Surgery confirmed the diagnosis in all patients.
    RöFo - Fortschritte auf dem Gebiet der R 10/1991; 155(3):207-10. · 2.76 Impact Factor
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    ABSTRACT: Nine patients with a cervical tumour, diagnosed by duplex Doppler sonography were additionally evaluated by colour-coded Doppler sonography (CCDS). The duplex Doppler diagnosis of three internal carotid artery aneurysm was confirmed by CCDS in only one patient. In the remaining two cases CCDS identified a marked coiling of the internal carotid artery. Three low echogenic lesions, interpreted as cervical lymphomas by conventional Doppler sonography were identified as two internal carotid aneurysm with partial thrombosis and a carotid body tumour in the third patient by CCDS. Duplex-Doppler sonography and CCDS agreed in the diagnosis of two AV-malformations and one carotid body tumour. Angiography confirmed the CCDS-diagnosis in 7 patients. In the two patients with coiling of the ICA angiographic evaluation was not performed. Thus, CCDS was superior to duplex Doppler sonography in the evaluation of vascular lesions of the extracranial section of the carotid artery and provided additional diagnostic information.
    Ultraschall in der Medizin 05/1991; 12(2):70-3. · 4.12 Impact Factor
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    ABSTRACT: Color-coded Doppler sonography of the vertebral arteries was performed in 86 patients who had a history of vertebrobasilar disease. The origin of the artery was visualized in 87.2% on the right and 70.9% on the left side. The inter-transverse portion of the vertebral artery was visualized in 95% on the right and 97% on the left side. The atlas loop could be visualized in 88.4% on the right and 84.9% on the left side. Pathologic findings were hypoplasia (n = 4), stenosis (n = 19), dissection (n = 2), occlusion (n = 7), kinking (n = 12), cervical tumors (n = 3), and subclavian steal syndrome (n = 3). Nine postoperative patients had subclavian and vertebral artery reimplantation to the common carotid artery. The characteristic color-coded Doppler sonographic features of these findings are presented and discussed.
    Journal of ultrasound in medicine: official journal of the American Institute of Ultrasound in Medicine 05/1991; 10(4):221-6. · 1.40 Impact Factor
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    ABSTRACT: Common carotid artery occlusion is not necessarily associated with thrombosis of the ipsilateral internal carotid artery. Noninvasive imaging of the carotid bifurcation with colour-coded Doppler sonography demonstrated patency of the external and internal carotid arteries distal to a common carotid occlusion in 4 patients which could be proven surgically. Identification of internal carotid artery patency could be demonstrated by angiography in two of the patients while in the other two cases angiography was inconclusive. Thus, CCDS provided a correct diagnosis of the internal carotid patency in these patients with common carotid occlusion.
    RöFo - Fortschritte auf dem Gebiet der R 02/1991; 154(1):44-8. · 2.76 Impact Factor
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    ABSTRACT: A new software, called the velocity variance programme, by which flow disturbances are additionally colour-coded, was systematically applied with colour Doppler sonography in 59 patients with stenotic atheromatous lesions of different grades in the carotid bifurcation. A direct comparison with and without using this programme was made. In group 1 (n = 23) with stenosis of the internal carotid artery of more than 50% it could be demonstrated that flow disturbances were maximally in the region immediately downstream of the stenosis and complete dissipation of these effects occurred within 8-10 vessel diameters downstream. Moreover, a direct correlation between the size of the region of disturbed flow and the irregularity of the stenotic plaque surface within the stenosis could be demonstrated. Distal to the stenosis there was an inverse relationship between the extension of disturbed flow and the length of the stenosis and a direct relationship to the grade of the stenosis and the irregularity of the plaque surface. In patient group 2 (n = 36) with less than 50% diameter reduction, a local flow disturbance near the atheromatous plaque was shown in 27 patients. In eighteen of these patients the region of disturbed flow could be revealed only by using the velocity variance programme. The importance of this non-invasive in-vivo visualisation of flow disturbances in the carotid bifurcation is discussed.
    RöFo - Fortschritte auf dem Gebiet der R 01/1991; 153(6):663-8. · 2.76 Impact Factor
  • Rofo-fortschritte Auf Dem Gebiet Der Rontgenstrahlen Und Der Bildgebenden Verfahren - ROFO-FORTSCHR RONTGENSTRAHL. 01/1991; 155(09):207-210.
  • Rofo-fortschritte Auf Dem Gebiet Der Rontgenstrahlen Und Der Bildgebenden Verfahren - ROFO-FORTSCHR RONTGENSTRAHL. 01/1991; 154(01):44-48.
  • Ultraschall in Der Medizin - ULTRASCHALL MED. 01/1991; 12(02):70-73.
  • B W Schwaighofer, S Trattnig
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    ABSTRACT: A total of 844 patients were evaluated to compare the value of ultrasonography and color-flow Doppler and to demonstrate the advantage presented by the latter method. In 89%, color-flow assessment was in complete agreement with the duplex assessment. In the remaining 11%, important additional results were discovered in the color-flow examination. Non-stenotic plaques were seen more often (43%) in the wide carotid bulb; stenotic plaques and occlusion were found more often (66% and 82%) in the internal carotid artery. Color-flow Doppler allows the sonomorphological (plaques, stenoses, occlusion) and functional parameters (turbulences, flow enhancement) to be studied at the same time.
    Der Radiologe 12/1990; 30(11):511-5. · 0.47 Impact Factor
  • S Trattnig, B Schwaighofer, F Kainberger, P Hübsch
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    ABSTRACT: Pulsatile blood flow within the normal carotid sinus involves at least two distinct components. Beside the laminar antegrade flow, there is a boundary layer separation zone in the posterolateral aspect with transient flow reversal. This flow reversal is well known from in vitro studies. It is now possible to document these flow velocity components using color-coded Doppler sonography. It is hypothesized that if flow separation is detected, this is indicative of a normal condition of the carotid bifurcation. When atherosclerosis develops, it involves preferentially the posterolateral bulb region, obliterating the normal configuration of the sinus with consequent loss of the flow separation. Therefore, loss of flow reversal should be indicative of atherosclerosis. We have studied this flow pattern retrospectively in 156 patients (312 arteries). In 4 patients no flow reversal could be detected although no atheromatous lesions could be found at the bifurcation, but in these cases there was no bulb formation in the common carotid artery or in the internal carotid artery. On the other hand, flow reversal was demonstrable in several pathological conditions within the carotid bifurcation. These included plaque formation after the bifurcation in 7 patients, internal carotid artery occlusion at the origin in 12, common carotid artery occlusion despite a patent bifurcation in 4, and marked dilatation of the lumen forming a pseudobulb following disocclusion of the carotid artery in 11 patients.
    Der Radiologe 12/1990; 30(11):516-9. · 0.47 Impact Factor
  • S Trattnig, B Schwaighofer
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    ABSTRACT: Color-coded Doppler sonography of the vertebral arteries was performed in 86 patients with a history of vertebrobasilar disease. The origin of the artery was visualized in 87.2% on the right and 70.9% on the left side. The interforamen portion of the vertebral artery was visualized in 95% on the right and 97% on the left side. The atlas loop could be visualized in 88.4% on the right and 84.9% on the left side. Pathologic findings were hypoplasia (n = 4), stenosis (n = 19), dissection (n = 2), occlusion (n = 7), kinking (n = 12), and subclavian steal syndrome (n = 3). Nine postoperative patients had subclavian and vertebral artery reimplantation into the common carotid artery. The characteristic color-coded Doppler sonographic features of these findings are presented and discussed.
    Der Radiologe 12/1990; 30(11):520-4. · 0.47 Impact Factor
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    ABSTRACT: The parathyroid hormone concentration in the blood measured by the 'two-site radioimmunoassay', which is specific for the biologically active parathyroid molecule (parathyrine), was compared with the radiological manifestations of secondary hyperparathyroidism (HPT) on magnification radiographs of the phalanges in patients undergoing maintenance hemodialysis and in patients with renal allografts. Sensitivity of radiology for the diagnosis of HPT proved to be high (88%), whereas specificity was low (30%). Statistical analysis showed that there was a good correlation between the parathyrine levels and the intensity of radiological changes in the phalanges in patients with renal allografts (coefficient of Krueger-Spearman = 0.65). In patients undergoing hemodialysis the correlation between laboratory parameters and radiological changes was poor.
    Acta Radiologica 10/1990; 31(5):505-8. · 1.33 Impact Factor
  • B W Schwaighofer
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    ABSTRACT: Color-flow Doppler is a new development of duplex sonography of the peripheral vessels. In this study 844 consecutive patients were evaluated (a) to assess the comparative value of these two methods, (b) to see if there is a correlation between the degree of stenosis and the incidence of neurological symptoms and (c) to find a possible relationship between the plaque structure and the incidence of neurological deficits. (a) In 89%, the color-flow assessment was in complete agreement with the duplex assessment. In the remaining 11%, important additional results were discovered in the color flow examination. (b) Non-stenotic plaques were seen more often (43%) in the wide carotic bulb, stenotic plaques and occlusion were found more often (66 and 82%) in the internal carotic artery. Vessel occlusion was found most often in patients with cerebral ischemia. Color-flow Doppler demonstrated a higher incidence of hemodynamic stenosis in patients with peripheral vascular disease, hypertension and bruits. (c) Patients with heterogeneous plaques demonstrated a significantly higher risk of neurological deficits than those with homogeneous plaques. The great advantage of color-flow Doppler is that it enables sonomorphological (plaques, stenoses, occlusion) and functional parameters (turbulences, flow enhancement) to be studied during the same procedure.
    Wiener klinische Wochenschrift 10/1990; 102(17):496-503. · 0.81 Impact Factor
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    ABSTRACT: 33 patients presenting with arthralgia of wrists and finger joints were examined by radionuclide imaging and radiography. In 22 patients clinical symptoms turned out to be caused by inflammation, 11 patients suffered from degenerative joint disorder. Radionuclide imaging proved once more to be nonspecific albeit very sensitive; plain film radiography exhibited good specificity. The combination of both methods resulted in an increase in accuracy as compared to scintiphotography alone (0.88 vs. 0.79). Radionuclide imaging and radiography should therefore always be done and interpreted simultaneously. Radionuclide imaging is mandatory to confirm or to rule out inflammatory joint disorder in case of an inconclusive x-ray (absence of erosions or degenerative changes). A negative radionuclide study rules out inflammation, even when juxta-articular demineralisation is suspected on the x-ray.
    Röntgen-Blätter; Zeitschrift für Röntgen-Technik und medizinisch-wissenschaftliche Photographie 05/1990; 43(4):133-6.

Publication Stats

195 Citations
134.31 Total Impact Points

Institutions

  • 1987–1993
    • Medical University of Vienna
      • Universitätsklinik für Radiodiagnostik
      Vienna, Vienna, Austria
    • Vienna General Hospital
      Wien, Vienna, Austria
  • 1987–1991
    • University of Vienna
      Wien, Vienna, Austria
  • 1988
    • Institut für Hochenergiephysik Wien
      Wien, Vienna, Austria