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Results for “Ultrasonography, Doppler, Color”

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At least 19 recordsLinked to original sources

PubMed1995

Blood flow in free muscle flaps measured by color Doppler ultrasonography.

Color Doppler ultrasonography, a noninvasive method for studying changes in blood flow, has been used to monitor 18 patients with free microvascular lower limb muscle flaps. The peak, mean, and minimum velocities, resistance indices, and diameters of the flap pedicle arteries and also of the limb recipient arteries proximal to the microvascular anastomoses were measured at 2 and 6 weeks and 3, 6, and 9 months after surgery. The peak velocities did not significantly differ from each other, but the mean velocity in the flap pedicle arteries was 12.5% higher than that in the recipient arteries throughout the study period. End diastolic velocity in the pedicle was positive (toward the ultrasound probe) at 2 weeks (mean, 2 cm/sec, SD 10), 6 weeks (mean, 5 cm/sec, SD 16), and 3 months (mean, 3 cm/sec, SD 13) after surgery and significantly higher (P < 0.05) than at 6 months (mean, 7 cm/sec, SD 11), when the pattern of blood flow was normal forward/backward flow during systole/diastole. The resistance indices of the pedicle at 2 weeks (Ri = 0.978), 6 weeks (Ri = 0.936), and 3 months (Ri = 1.001) were significantly lower (P < 0.05) than at 6 months (Ri = 1.108), when the pedicle and recipient artery indices were the same. The diameter of the pedicle arteries was 14% smaller than those of the recipient arteries, but did not change during follow-up. This prospective clinical study shows that blood flow in the pedicle of a free microvascular muscle flap is increased until 6 months after surgery, mainly due to the increased minimum velocity of the pedicle in diastole and decreased resistance index. These findings can be attributed to the loss of vessel tone after denervation and are in accordance with earlier studies showing that denervated muscles lose their autoregulation and that blood flow increases, but that these phenomena subside with time. Increased blood flow in free muscle flaps can explain the high success rate of microanastomoses and positive effect on wound healing.

Adult↗

PubMedDate not supplied

[Breast blood supply in various diseases as evidenced by color Doppler ultrasonography].

Color doppler sonography, traditional sonography, and mammography without contrast staining, as well as physical and pathomorphologic methods were used in examinations of the mammary glands of 76 women aged 18 to 65. Characteristic features of the blood supply to the gland were detected, and differential diagnostic criteria defined on the basis of these findings, to simplify differentiation between malignant and benign nodular formations and the diffuse changes in the mamma.

Adolescent↗

PubMedDate not supplied

Evaluation of penile arteries in papaverine-induced erection with color Doppler ultrasonography.

OBJECTIVE: Color Doppler ultrasonography is a useful method in the evaluation of small vessels and vascular anatomy and in demonstrating dynamic changes of blood flow. The detrimental effects of different risk factors of erectile dysfunction such as diabetes mellitus, hypertension, hypercholesterolemia on the penile arterial system were investigated. METHOD: 180 patients with erectile dysfunction underwent functional evaluation of the arterial system by combined intracavernous injection of 60 mg papaverine and stimulation test and color Doppler ultrasonography. RESULTS: There were 64 patients (35.55%) whose vascular findings were normal. A total of 36 patients (20.00%) had arterial insufficiency and 42 patients (23.33%) had mixed-arteriogenic-venogenic impotence. Combination of hypertension and hypercholesterolemia was found to be more detrimental to the penile arterial system than hypertension alone, the presence of hypertension and diabetes mellitus together, diabetes alone and hypercholesterolemia. CONCLUSION: Color Doppler ultrasonography depends on variables such as equipment, operation and software version in the functional evaluation of the penile arterial system. The combination of hypertension and hypercholesterolemia was found to be more detrimental to the penile arterial system. Further studies based on larger patient populations are required in order to determine the effects of erectile dysfunction contributing disease on the penile arterial system.

Arteries↗

PubMed1996

Pancreatic arteriovenous malformation with duodenal ulcer. Demonstration by color Doppler ultrasonography.

We report the color Doppler ultrasonography features of arteriovenous malformation (AVM) of the pancreas, a very rare disease. The patient was a 52-year-old man with congenital AVM of the pancreas and a duodenal ulcer that had been resistant to medication. Endoscopic color Doppler ultrasonography (color Doppler EUS) revealed many abnormal color signals showing pulsatile wave form at the portion of the duodenal wall involving the duodenal ulcer. Extracorporeal color Doppler ultrasonography revealed a mosaic-like color signal, caused by turbulent flow, in the portal trunk. Angiography demonstrated a vascular network with extensive proliferation at the pancreatic head and early portal filling. It is possible that the pancreatic AVM had caused the duodenal ulcer. Color Doppler EUS can be a useful modality for detection of vessel abnormalities of the gastrointestinal tract.

Arteriovenous Malformations↗

PubMedDate not supplied

The measurement of the calibers and blood-flow velocities of the arteries of the circle of Willis: a statistical investigation of 120 living subjects using transcranial color-Doppler ultrasonography.

We have examined 120 subjects (52 men, 68 women; age range: 19 to 89) with no vascular pathology. In each subject, we used transcranial color-doppler ultrasonography to measure the calibers and blood-flow velocities of the anterior, middle, and posterior cerebral arteries (ACA, MCA, and PCA, respectively). Generally, the mean measured calibers were lower than those that have been described in cadaveric studies by other investigators. The mean caliber of the MCA was found to be higher than those of the ACA or PCA; this difference was statistically significant (p < 0.05). With age, the calibers of the ACA, PCA and PCA tended to increase, but this trend was not statistically significant. We have noted a statistically significant difference between the left and right sides, the arteries of the left being larger than those of the right. However, there was no statistically significant relationship between vessel caliber and age, sex, or body weight, though the women's arteries tended to be narrower than those of the men. With respect to the maximal and mean blood-flow velocities, no statistically significant relationships with regard to side (left or right), sex, age, or body weight were demonstrable. However, the mean and maximal blood-flow velocities of the MCA were found to be statistically higher than those of the ACA or PCA (p < 0.02). This was especially true under the age of 60 (p < 0.01).

Adult↗

PubMed1994

[Doppler color ultrasonography of maternal-fetal circulation in HELLP syndrome].

The authors investigated the blood flow velocity waveforms of the mothers uterine arteries and fetal middle cerebral, renal and umbilical arteries in cases of HELLP syndrome by color Doppler ultrasonography. The elevated velocimetry indices in the uterine and umbilical arteries were the result of utero-placental and fetoplacental vascular lesions with resultant decrease in blood flow. These laid to the centralization of fetal circulation with increased blood flow in cerebral and decreased in renal arteries. All women were delivered small for gestational age infants.

Adult↗

PubMed1994

[Comparison of the results of conventional ultrasonography and color doppler analysis in the evaluation of the nature of adnexal tumors. II. Color duplex doppler ultrasonography].

The author evaluates the possibilities of coloured Doppler vaginosonography for prebioptic evaluation of the nature of ovarian tumours. He investigated the site of vascularization of tumours and qualitatively the blood flow by assessing the vascular resistance (PI, RI) and character of the flow velocity curve. The results revealed a statistically significant (p < or = 0.05) trend of central vascularization of malignant tumours. A new parameter with a 100% sensitivity and 89% specificity proved to be the notch at the beginning of the diastolic part of the velocity curve which was not observed in any carcinomas but was present in 89% of benign lesions. The vascular resistance was significantly lower in malignant tumours. The cut off value of malignity of the pulsatility index PI = 0.7 had a 86% sensitivity and 100% specificity. The cut off value of the resistance index RI is 0.6 with a 100% sensitivity and 75% specificity. Comparison of the predictive values of malignity of conventional and coloured duplex ultrasonography revealed that for evaluation of the nature of ovarian tumours coloured duplex sonography with several parameters is more suitable. PI and RI alone can be considered rather as indicators of active growth.

Adult↗

PubMed1996

Transient arteriovenous fistulae after transrectal prostate biopsy: diagnosis with color Doppler ultrasonography.

To assess the prevalence and significance of arteriovenous fistulae after prostate biopsy, we performed color Doppler ultrasonography immediately after 136 consecutive transrectal prostate needle biopsies. Pathologic results were correlated with color Doppler ultrasonographic findings. Arteriovenous fistulae developed after 17 biopsies (13%), all closed spontaneously within 18 minutes, and none were associated with unusual bleeding. Carcinoma was noted in 25 biopsy specimens (18%), 10 (40%) of which were followed by arteriovenous fistula. The correlation between malignancy and postbiopsy arteriovenous fistula was statistically significant (P < 0.0004), consistent with hypervascularity known to be present in many prostate cancers.

Arteriovenous Fistula↗

PubMed1995

[Evaluation of cavernous artery by color Doppler ultrasonography--significance of ultrasonic beam angle].

Penile Doppler ultrasonography is widely accepted as an essential examination in the diagnosis of impotence. However, measurement blood flow velocity using Doppler ultrasonography may be subject to some errors. We performed color Doppler ultrasonography in 63 patients with normal penile vascular function as diagnosed using positive responses to intracavernous pharmacological stimulation. We compared the Doppler measurement results of the 126 cavernous arteries and the ultrasonic beam angles. We used a Hitachi EUB 515, a sonographic probe of 7.5 MHz, a sampling width of 0.8 mm, a sampling depth of 1 mm, and a wall motion filter was not used. Ultrasonic beam angles were 5 to 77 degrees. The mean peak systolic velocity and end diastolic velocity values were 40. 0 cm/s and 3.9 cm/sec, respectively. The peak systolic velocity and end diastolic velocity values remained stable regardless of the ultrasonic beam angles (Kruskal-Wallis test, p = 0.56, p = 0.70). However, the variance of values became greater when the ultrasonic beam angles was larger than 55 degrees in the case of peak systolic velocity (F test, p < 0.05) and 50 degrees in the case of end diastolic velocity (F test, p < 0.05), indicating a reduction in reliability. Resistance index variance was significantly higher when ultrasonic beam angle exceeds 50 degrees (F test, p < 0.05). We believe that we should accept only those cavernous artery peak systolic velocity measurements as reliable when the ultrasound beam angle is less than 55 degrees.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗

PubMed1996

Diagnosis of gallbladder carcinoma with color Doppler ultrasonography.

A 65-yr-old woman was referred to our department for evaluation of a gallbladder lesion detected at another institution, where she was diagnosed with chronic cholecystitis. Conventional ultrasonography revealed that the gallbladder lumen was filled with debris-like components, and the gallbladder wall was mildly thickened. Color Doppler ultrasonography revealed color signals in both the lesion and the gallbladder wall. These signals showed a high-speed pulsatile wave, and one of the visualized signals revealed a high-resistance index (1.0) on fast Fourier transform analysis. These findings were highly suggestive of malignancy. Surgery was performed, and histological examination of the resected specimen revealed carcinoma of the gallbladder. We conclude that color Doppler ultrasonography can be useful in the diagnosis of tumefactive gallbladder lesions.

Adenocarcinoma↗

PubMed1995

Image-directed and color Doppler ultrasonography in the diagnosis of postbiopsy arteriovenous fistulas of native kidneys.

Using image-directed and color Doppler ultrasonography (ICDUS), we examined 65 patients with single kidney biopsy and diagnosed one arteriovenous fistula (AVF) in each of 8 kidneys. Three of them were associated with pseudoaneurysms. Three of the patients with AVF who presented with macrohematuria underwent angiography. Therapeutic percutaneous embolization was performed in 2 of them. The remaining 6 patients were followed up with ICDUS. All the lesions had disappeared at the end of a 6-month period. We conclude that ICDUS is an easy and noninvasive imaging technique in the diagnosis of postbiopsy native renal AVFs.

Adolescent↗

PubMed1995

Color Doppler ultrasonography in the identification of communicating vessels in twin-twin transfusion syndrome and acardiac twins.

This study evaluates the role of color Doppler ultrasonography in the identification of the communicating placental vessels in pregnancies with twin-twin transfusion syndrome and acardiac twins. In 18 pregnancies with twin-twin transfusion syndrome and two with an acardiac twin, color Doppler studies of the placental vasculature were performed before fetoscopy for laser coagulation of the communicating vessels. In six cases of twin-twin transfusion syndrome the placental attachment of the intertwin membrane could be visualized. Pulsatile arterial blood flow was observed from the donor to the recipient twin that disappeared after laser therapy. In both cases of acardiac twins, one communicating vessel with pulsatile and another vessel with nonpulsatile blood flow in the opposite direction could be identified. Color Doppler imaging is unlikely to play a major role in assisting endoscopic laser separation of chorioangiopagus in patients with acute polyhydramnios, but it may prove to be useful in the early identification of pregnancies at risk of developing twin-twin transfusion syndrome.

Acute Disease↗

PubMed1995

Prenatal diagnosis of cerebral arteriovenous malformation using color Doppler ultrasonography: case report and review of the literature.

Aneurysms of the vein of Galen are rare, representing less than 1% of all intracranial arteriovenous malformations. In the fetus, however, almost all cerebral arterial malformations involve the vein of Galen, usually presenting in the neonatal period with severe cardiac failure leading to neonatal death. In this report we present a case of arteriovenous malformation involving the vein of Galen detected prenatally at 35 weeks with the use of color Doppler ultrasonography. The literature is reviewed in an attempt to delineate the role of prenatal ultrasonography in the diagnosis and its impact on perinatal outcome.

Adult↗

PubMed1995

Effects of external radiotherapy on uterine blood flow in patients with advanced cervical carcinoma assessed by color Doppler ultrasonography.

BACKGROUND: This study was designed to evaluate radiation-induced changes in tumor blood flow by color Doppler ultrasonography. METHODS: Color Doppler examination was performed on 14 patients with advanced cervical carcinoma treated with external radiotherapy. The total dose of radiation varied from 30 to 65 Gy and was given as 1.9 Gy daily fractions, 5 days/week. Tumor vascularity and blood flow impedance were measured by one pretreatment and five follow-up examinations. RESULTS: At the baseline examination, 11 of 14 patients had very low tumor blood flow impedance (< 0.70). Radiotherapy caused a significant decrease in tumor vascularity (P = 0.0001) and in presence of very low blood flow impedance. The decrease of tumor vascularity during the treatment was associated with better outcome, whereas persistence of excessive vascularity or of vessels with low blood flow impedance at the end of radiation was associated with modest therapeutic response. Eight of 10 patients with increased tumor vascularity at the end of radiation needed further treatment or died of disease. Only one of four patients with normal vasculature at the end of radiotherapy needed further treatment and all four were clinically disease free during the follow-up (mean, 13 months; range, 6-26 months). CONCLUSIONS: These results suggest that color Doppler ultrasonography may be useful in early assessment of therapeutic response during radiotherapy and in for planning individualized treatment schedules.

Adenocarcinoma↗

PubMed1996

Percutaneous transhepatic biliary drainage using color Doppler ultrasonography.

We performed percutaneous transhepatic biliary drainage using color Doppler ultrasonography to decrease the complications of percutaneous transhepatic biliary drainage. Thirty patients underwent this procedure. We performed this method after identifying the second and third branches of the intrahepatic bile ducts, including the portal and the hepatic veins. The success rate of percutaneous transhepatic biliary drainage using color Doppler ultrasonography was 100% with one puncture in 29 patients and with two punctures in only one patient. We never encountered severe complications, such as bleeding, infection, hemobilia, or pseudoaneurysm formation in the hepatic artery. This method was safer and easier than the usual method using B-mode ultrasonography only.

Aged↗

PubMed1996

Assessment of arterial invasion in pancreatic cancer using color Doppler ultrasonography.

OBJECTIVE: We report the first study on the value of color Doppler ultrasonography (CDUS) in assessing arterial invasion of pancreatic cancer. METHODS: The relationships between tumors and surrounding major splanchnic arteries (celiac, superior mesenteric, common hepatic, splenic, and gastroduodenal arteries) were preoperatively evaluated with CDUS in 33 consecutive patients with pancreatic cancer. When a tumor partially or completely surrounded the artery, the invasion was diagnosed as positive. Imaging results were then compared with angiographic, surgical, and histopathological findings. RESULTS: In 22 nonsurgical patients, the correspondence rate of CDUS with angiography for the presence of invasion, absence of invasion, and overall was 78%, 95%, and 88%, respectively. In 11 surgical patients, a sensitivity of 60%, specificity of 93%, and accuracy of 87% for detection of arterial invasion were obtained in comparing CDUS with surgical and histopathological findings. There was no significant difference between the accuracy of CDUS and that of CT, or that of angiography. However, the accuracy of CDUS was higher than that of CT (72%) and equal to that of angiography (91%). CONCLUSION: Color Doppler ultrasonography is useful for detecting arterial invasion in pancreatic cancer. It may make angiography unnecessary, especially with advanced tumors, if thorough evaluation for the large artery invasion is performed initially.

Adult↗

PubMed1996

Early detection of ovarian carcinoma with transvaginal color Doppler ultrasonography.

OBJECTIVE: Our purpose was to assess the potentials and limitations of the early detection of ovarian cancer in protocols that involve transvaginal color Doppler ultrasonography. STUDY DESIGN: Retrospective analysis was performed on the data from 206 referred patients who either had surgical or clinical follow-up of ovarian masses evaluated by transvaginal color Doppler ultrasonography. Most of the patients were referrals or had risk factors. RESULTS: In this series of 206 patients, 26 ovarian cancers were detected, > 70% of which were stage I or II. CONCLUSION: Transvaginal color Doppler ultrasonography is capable of early detection of ovarian carcinoma. An improved detection rate may be realized with better identification of high-risk patients who should be studied with transvaginal color Doppler ultrasonography.

Adolescent↗

PubMed1995

Color Doppler ultrasonography for the assessment of renal blood flow in heart failure.

To validate color Doppler ultrasonography of renal arteries for the assessment of renal blood flow (RBF), we compared left and right RBF estimates and their sum (total RBF) by echo-Doppler with data obtained by iodine 123-123I-p-aminohippuric acid (PAH) scintigraphy in 19 patients with heart failure and 7 normal control subjects. Single-side and total RBF estimates by echo-Doppler ranged, respectively, between 179 and 428 mL/min/m2 and from 378 to 835 mL/min/m2 in patients with heart failure and between 265 and 601 mL/min/m2 and from 564 to 1,182 mL/min/m2 in normal control subjects. Single-side and total RBF estimates by echo-Doppler correlated well with measurements obtained by scintigraphy (r = 0.74 and 0.76, respectively, in patients with heart failure; both: p < 0.001). At Bland and Altman's analysis of correspondence between the 2 techniques, there were 17 disagreements (33.7%) for single-side RBF and 8 disagreements (31.8%) for total RBF. However, the two techniques disagreed markedly in only two single-side and one total RBF estimates. Thus, in patients with heart failure, RBF assessed noninvasively by color Doppler ultrasonography has a good correlation with 123I-PAH renal scintigraphy data over a wide range of blood flow.

Adult↗