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Biomedical subjects

U Hau

Publications and source records attributed to U Hau.

8 recordsLinked to original sources
PubMed1993

Effects of fenofibrate on angiographically examined coronary atherosclerosis and left ventricular function in hypercholesterolemic patients.

Within the framework of a prospective lipid-lowering intervention study 44 patients were treated over a period of 3 years with a lipid-lowering diet and 200-400 mg fenofibrate daily. The intervention led to statistically significant decreases in total cholesterol (Chol), low density lipoprotein cholesterol (LDL-Chol) and triglycerides levels, and to a significant increase in high density lipoprotein cholesterol (HDL-Chol) levels. Despite intervention, in 8 patients the HDL-Chol levels decreased by up to 20 mg/dl, where these were mainly patients with high initial values. Likewise, the triglycerides of 4 patients whose initial levels were relatively low increased (up to 49 mg/dl) and the LDL-Chol levels of 8 patients whose initial levels were also low increased (up to 49 mg/dl). Only minor success was achieved through the 6-week diet, but this was still slightly significant for Chol and LDL-Chol levels. A total of 21 patients underwent repeat angiography within 3 years for clinical reasons. For the evaluation of the angiographic progress a total of 98 minor and moderate stenoses was measured using digital image processing and automatic contour finding. The change in the angiographic parameters 'percent diameter reduction' (%DR) and 'percent plaque area' (%PA) correlated with on-treatment LDL-Chol levels (%DR change with LDL-Chol: r = 0.67, P = 0.0005; %DR change with Chol: r = 0.61, P = 0.002; %PA change with LDL-Chol: r = 0.40, P = 0.037; %PA change with Chol: r = 0.38, P = 0.044), while for HDL-Chol and triglycerides no influence on the angiographic progress could be demonstrated. On the basis of the reproducibility of the measuring methods the patients were classified in the categories 'regression', 'unchanged' and 'progression'. The patients classified as 'regression' (parameter: %DR change) showed an LDL-Chol mean value of 162 +/- 9 mg/dl, whereas those classified as 'unchanged' or 'progression' showed values of 189 +/- 25 mg/dl and 199 +/- 21 mg/dl, respectively (P = 0.014). A negative correlation appeared between the angiographic progress parameters and the initial degree of stenosis. The left ventricular ejection fraction in the second angiography showed relationships to lipoprotein levels and angiographic progress parameters.

Coronary Angiography↗
PubMed1992

[The diagnosis of bone marrow lesions in the MR tomogram in children with diseases of the hematopoietic system with special reference to post-therapy changes].

119 MR-examinations of both tibiae, knees and the lower part of both femur were performed in 41 children suffering from bone marrow disease (27 ALL, 4 AML, 3 NHL, 1 agranulocytosis, 6 anaemia). T1- and T2-spin-echo sequences and a T2-gradient-echo sequence were used. Bone marrow changes in leukaemia were diffuse before therapy and patchy after therapy. Due to their different signal in T2-weighted images, differentiation of the post-therapeutic patchy findings into infiltrations, fibrosis, necrosis and siderosis seems to be possible. In future, MRI will be the method of choice for screening and controlling bone marrow disease if the examination time is shortened by using only a T1-spin-echo sequence and a T2-gradient-echo sequence.

Adolescent↗
PubMed1992

[MR tomography of the lower limbs of children with diseases of the hematopoietic system].

In 41 children with disorders of the hematopoetic system 119 MR examinations of both tibiae and knees were performed (T1 and T2 spin-echo sequences and a T2 gradient-echo sequence). Before therapy bone marrow changes in leukemia were diffuse, and patchy during and after therapy. Signals in T2-weighted images were different for infiltrations, fibrosis, necrosis and siderosis. In 3 children suspected of suffering from osteomyelitis, Ewing-sarcoma or coxitis, MR examination was the first to show the correct diagnosis. Therefore in children indications for MR tomography should be handled more generously to win time for therapy. Using only a T1 spin-echo sequence and a T2 gradient-echo sequence screening of more than one region is capable of controlling bone marrow diseases.

Acute Disease↗
PubMed1992

[Radioimmunoscintigraphy and magnetic resonance tomography in the diagnosis of urinary bladder cancer].

Magnetic resonance tomography is a method which is sufficiently precise to demonstrate morphological changes for tumor staging of carcinoma of the urinary bladder. The stage of the tumor was correct in 68 resp. 86% of the patients. The RIS shows organ and lymph node metastases and has the capability to differentiating between scar and tumor after transurethral resection. The local spread, especially the infiltration depth of the tumor, is not visible. In 90% of the patients a primary tumor was detected, only in 5 cases a false-negative and in 2 cases a false-positive finding was made.

Adult↗
PubMed1992

[Clinical value of the ultrafast gradient echo sequence "Quickflash"].

It is possible to develop faster sequences with 6 mT/m gradient field strength. However, the short gradient switch times which are advantageous for a better image contrast cannot be achieved. Using longer measurement times the influence of the preparation pulses is less dominant. The image quality of the quickflash is poorer than that of conventional SE and GE sequences. In some cases, especially for outline views and in the evaluation of Gd inflow into pathologic tissue or in restless patients, we use the quickflash in clinical routine.

Brain Diseases↗
PubMed1991

Progression and regression of minor coronary arterial narrowings by quantitative angiography after fenofibrate therapy.

To study the effects of fenofibrate, a lipid-lowering medication, on patients with coronary artery disease, 191 minor coronary narrowings in 42 patients with coronary artery disease were analyzed by quantitative coronary angiography using computer-assisted contour detection. Computed parameters were percent diameter reduction and percent plaque area. A prospectively formed intervention group of 21 patients treated with special diet and fenofibrate (200 to 400 mg/day) was checked every 6 weeks with regard to risk factors. After a mean interval of 21 months, coronary angiography was repeated, using the same x-ray system and nearly identical projections. The intervention group was angiographically compared at follow-up with an untreated comparison group, also comprising 21 patients. Both groups had high initial serum cholesterol (mean 311 mg/dl) and low-density lipoprotein (LDL) cholesterol levels (mean 235 mg/dl). Only among the treated patients did lipid levels change significantly: cholesterol, -19%; LDL cholesterol, -20%; high-density lipoprotein cholesterol, +19%; and triglycerides, -30%. At angiographic follow-up, the changes in percent diameter reduction and percent plaque area correlated positively with the mean serum and LDL cholesterol levels of the intervention group. Significant differences were found in the change in percent plaque area between both groups. The intervention subgroup with angiographic regressions (11 patients) had significantly lower serum and LDL cholesterol levels than the intervention subgroup with angiographic progressions (10 patients). These results indicate the beneficial effect of fenofibrate on minor coronary narrowings. Because of its high reproducibility in measuring minor narrowings, quantitative coronary angiography proved to be a suitable method for angiographic follow-up.

Cholesterol↗
PubMed1991

[Quantitative coronary angiography: progression and regression of coronary stenoses--an intervention study with fenofibrate].

In order to examine the effect of fenofibrate on coronary narrowings, within the framework of a prospective intervention study, we treated a total of 44 hypercholesterolemic patients (who were in our clinic to undergo PTCA) with diet and fenofibrate (200-400 mg/day) over a period of 3 years. After a mean interval of 21 months, control angiographies were performed in nearly identical projections for 21 patients on clinical grounds. The minor and medium-grade narrowings of the reangiographed patients at the beginning and at the end of the intervention interval were measured by means of digital image processing and automatic contour detection. The measuring parameters were percent diameter reduction (% DR) and percent plaque area (%PA). With regard to their angiographic progression, the 21 reangiographed patients of the intervention group were compared to a comparison group consisting likewise of 21 patients of similar age and sex distribution and persistently high lipid and lipoprotein levels. During the intervention period, the reangiographed patients of the intervention group showed the following changes of the lipid and lipoprotein levels in contrast to the outset values: cholesterol -19 +/- 8%, LDL -20 +/- 14%, HDL +19 +/- 44%, triglycerides -30 +/- 31%.(ABSTRACT TRUNCATED AT 250 WORDS)

Angioplasty, Balloon, Coronary↗