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Biomedical subjects

H Maass

Publications and source records attributed to H Maass.

At least 37 records · Page 2Linked to original sources
PubMed1992

Effect of head-down tilt bedrest (10 days) on lymphocyte reactivity.

Immunological responses of six healthy males to 10 days of head-down tilt bedrest (HDT) were assessed. Lymphocyte responsiveness was severely reduced immediately before, during, and immediately after the HDT, even though the lymphocyte numbers did not change. By contrast, delayed-type hypersensitivity was not affected. No dramatic changes were found in WBC counts and lymphocyte subpopulations, with the only exception of natural killer (NK) cells which transiently decreased immediately after HDT. Plasma cortisol levels were elevated above normal immediately before and during the HDT. The data suggest that the mitogenic response of lymphocytes was affected by psychological and fluid shift stress. These results are compared with data obtained during and after spaceflight. We conclude that the stress of HDT induces changes in immunological responsiveness that are strikingly similar to those arising from the stress of spaceflight.

Adult↗
PubMed1991

The depot GnRH analogue goserelin in the treatment of premenopausal patients with metastatic breast cancer--a 5-year experience and further endocrine therapies. Cooperative German Zoladex Study Group.

Continuous administration of gonadotrophin-releasing hormone (GnRH-)analogues leads to a receptor-down regulation of pituitary GnRH-receptors and subsequently inhibits ovarian hormone production. Since October, 1984, 118 evaluable pre- and perimenopausal patients (median age 42, range 25-55 years) with metastatic breast cancer were entered into an open phase II multicenter trial to evaluate efficacy of this new treatment modality. Patients were treated with the GnRH-analogue Goserelin (3.6 mg depot s.c. every 4 weeks) as first line therapy and followed up until progression. Mean serum gonadotrophins LH and FSH were significantly suppressed by Goserelin. Within 2-3 weeks, mean serum E2 values decreased to values seen in castrated women (less than 30 pg/ml). Overall objective response with complete and partial remissions (CR + PR) was achieved in 44.9% of patients with a median time to progression (mTTP) of 59 weeks, (range 20-163 weeks), no change (NC) in 28.0% with a mTPP of 27 weeks (range 16-101 weeks), and progression (P) in 27.1%. Responses were seen in ER-positive as well as ER-negative tumors, and in patients with different sites of metastases (locoregional, bone, visceral, multiple). The value of different prognostic factors in relation to response rates, time to progression and time to death (overall survival) is discussed. Median overall survival (time from beginning of palliative Goserelin treatment to death) was 148 weeks.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMed1991

Influence of melatonin treatment on human circadian rhythmicity before and after a simulated 9-hr time shift.

The hormone melatonin is currently proposed by some investigators to be an efficient means for decreasing the impairing effects of jet lag. Eight healthy male subjects, aged 20 to 32, underwent a 9-hr advance shift in the isolation facility of our institute during two periods each of 15 days' duration. In a double-blind, crossover design, subjects took either melatonin or placebo at 1800 hr local time for 3 days before the time shift and at 1400 hr for 4 days afterwards. The time shift was simulated on days 7 and 8 by shortening the sleep period by 6 hr and the following wake period by 3 hr. Body temperature was recorded every 90 min, and urine was collected at 3-hr intervals all day and night. Melatonin treatment enhanced the resynchronization speed of some, but not all, hormone and electrolyte excretion rates for several days after the time shift. The adaptation speed of the temperature rhythm significantly increased during one postshift day. In addition, the circadian temperature rhythm had a significantly higher amplitude under melatonin treatment than under placebo after the time displacement. For the placebo group, the rhythm of 6-hydroxymelatoninsulfate excretion exhibited an advance shift in five subjects, whereas the other three showed a delay shift, and adjustment did not achieve more than one-half of the expected value within 8 days. A significantly different adjustment could be observed in the melatonin-treated group: Seven subjects underwent an advance shift of the expected 9 hr within an average of 8 days. The results suggest that melatonin treatment can accelerate resynchronization of the melatonin excretion rhythm after eastward time zone transitions. The improvement is not, however, sufficiently great that we can recommend melatonin for the alleviation of jet lag.

Adult↗
PubMed1990

[Results of treatment following breast-saving therapy: analysis of intramammary recurrence].

1,135 patients were subjected to conservation treatment of the breast between 1972 and April 1990. The probability of survival without relapses and metastases is 82.2% (5 years) or 72.1% (10 years), respectively. Local recurrence from relapses is 94.8% (5 years) or 88.9% (10 years), respectively. 31 patients developed an intramammary relapse, whereas 3 presented a renewed ductal in-situ manifestation, that was not considered to be a relapse. An unfavourable prognosis in respect of the rate of local relapses is considered to be dependent upon the size of the tumour. Other unfavourable factors are youthful age, concomitant DCIS formations, lymphangiosis carcinomatosa and "incomplete" resection (i.e. not including healthy tissue surrounding the tumour). These various "risk factors" are discussed on the basis of the literature and the authors' patient material.

Adult↗
PubMed1990

Hormonal changes after parabolic flight: implications on the development of motion sickness.

Twenty-two different humoral parameters including stress-, gastrointestinal- and volume-regulating hormones were measured before and within 45 min after parabolic flight maneuvers of twenty healthy adult subjects. We compared hormonal data of motion sickness-affected participants with those unaffected. Changes in cortisol and vasoactive intestinal peptide plasma levels were significantly different (p less than 0.002 and p less than 0.004) between the two groups with increasing plasma levels of both hormones during motion sickness but decreasing levels within the control group. Growth hormone and prolactin plasma levels increased by 400% and 115% within the motion sickness-affected group and to a smaller degree (120% and 40% increases, respectively) within the control group, while ACTH levels were almost unchanged within both groups. Pancreatic polypeptide and gastrin plasma levels as well as plasma levels of insulin and C-peptide were significantly decreased within both groups after the parabolic flight. Plasma renin, aldosterone, atrial natriuretic peptide and cyclic GMP levels were unchanged within the control group. Within the motion sickness-affected group, plasma renin and aldosterone levels were decreased and atrial natriuretic peptide levels increased after the flight. Humoral parameters of the thyroid gland were neither changed within the groups nor different between the groups. The present data confirm previous results that increases in plasma levels of certain stress hormones participate in motion sickness. Furthermore, increases in vasoactive intestinal peptide levels participate in motion sickness. These increases could explain some of the gastrointestinal symptoms in motion sickness and might serve as markers for a discrimination between regular stress and motion sickness.

Female↗
PubMed1990

[Clinical aspects and requirements of radiology from the point of view of gynecology].

For primary diagnostics and the follow-up of gynaecological diseases, inspection with colposcopy and palpation play the most important role. Ultrasound techniques provide the most essential complementary method. Computed tomography is not helpful for the pretherapeutic staging of gynaecological cancer. This is especially true of the staging of cervical cancer especially for the lymph-node diagnosis. The same is the case in the diagnosis of recurrences. The uncertainty of all diagnostic procedures--the clinical and imaging techniques--very often leads to indications for staging operations.

Female↗