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Biomedical subjects

A Pourbagher

Publications and source records attributed to A Pourbagher.

8 recordsLinked to original sources
PubMed2004

Value of color Doppler ultrasonography in the evaluation of orbital vascular flow in end-stage renal disease patients undergoing hemodialysis.

PURPOSE: To evaluate choroidal and retinal vascular flow dynamics by means of color Doppler ultrasonography in patients with end-stage renal disease undergoing hemodialysis and to compare these findings with healthy controls. MATERIAL AND METHODS: Color Doppler ultrasonography and spectral analysis of nasal and temporal posterior ciliary and central retinal artery flow of both eyes were performed in 20 patients (40 eyes) and 22 controls (44 eyes) to assess peak systolic flow velocity, end-diastolic flow velocity, and resistive indices (RI). Patients with hypertension, diabetes mellitus, and any cardiac pathology were not included in the study. A general ophthalmologic examination was performed in all patients and controls. RESULTS: The average peak-systolic and end-diastolic blood flow velocities of nasal (12.88 +/- 4.91/6.88 +/- 3.26) and temporal (15.22 +/- 9.59/6.41 +/- 3.97) posterior ciliary artery and central retinal artery (14.94 +/- 8.38/6.7 +/- 4.13) in patients were significantly higher than the corresponding values of the controls. The RI values of nasal (0.52 +/- 0.10) and temporal (0.58 +/- 0.12) posterior ciliary artery and central retinal artery (0.55 +/- 0.11) in patients with end-stage renal disease undergoing hemodialysis were significantly lower than in the controls. CONCLUSION: Choroidal and retinal blood flow velocities are higher and RI values for all three vessels lower in patients with end-stage renal disease undergoing hemodialysis compared to healthy controls. These alterations may be related to either increased choroidal blood flow or vasoconstriction of the proximal vessels.

Adolescent↗
PubMed2001

Urachal remnants in asymptomatic children: gray-scale and color Doppler sonographic findings.

PURPOSE: We undertook this study to evaluate the frequency of visualization and the sonographic appearances of urachal remnants (URs) in asymptomatic children. METHODS: One hundred eighty-two children without any urachus-related symptoms underwent sonography of the prevesical region and urinary bladder with high-frequency transducers. RESULTS: A UR was visualized in 180 (99%) of the children. The URs had a mean length +/- standard deviation of 13 +/- 5 mm. Most of the URs were ovoid, and most demonstrated a moderate protrusion into the bladder cavity. The URs with a central echogenic area were larger than those without central echogenicity. In 36 (61%) of the 59 URs that were evaluated with color Doppler sonography, vascular signals were demonstrated within the lesion. The URs with internal vascular signals were significantly larger than those without internal vascular signals. CONCLUSIONS: The gray-scale and color Doppler sonographic characteristics of URs seem to be related to their size and their degree of involution rather than to the age of the child. We think that URs are present in almost all children. URs should be considered normal findings if they are asymptomatic and their length is not significantly greater than 22.5 mm, the 95th percentile in our study.

Adolescent↗
PubMed2000

Doppler sonographic diagnosis of primary transitional cell carcinoma of the ureter.

Primary carcinoma arising in the urothelium of the ureter is rare, accounting for only 1% of all cancers of the upper urinary tract. We describe a case in which primary transitional cell carcinoma of the right ureter was sonographically detected in a 45-year-old woman. The mass exhibited tumoral vascularity on power Doppler sonography and spectral analysis.

Carcinoma, Transitional Cell↗
PubMed1998

Carotid steal: report of ten cases.

The blood flow may be diverted from the external to the internal carotid artery via the carotid bulb in the absence of flow in the common carotid artery. We aimed to investigate the prevalence, hemodynamics, and clinical features of this condition. Reviewing the records of color duplex ultrasonographic examinations, we found carotid steal in 12 carotid arteries of 10 patients. In three patients flow in the ipsilateral external carotid artery was bidirectional. The steal had been demonstrated angiographically in six patients. The cause of the phenomenon was atherosclerosis, Takayasu arteritis, or trauma. Awareness of this pathway of collateral circulation may contribute to diagnostic work-up and expand management alternatives.

Adolescent↗
PubMedDate not supplied

Mesenteric Castleman's disease: case report.

An asymptomatic case of hyaline vascular-type Castleman's disease localized to the mesentery and detected incidentally by ultrasound is presented. Computed tomographic, angiographic, and histologic findings are reported. This type of Castleman's disease predominates in the thorax and is very rare in the mesentery.

Adult↗