Biomedical subjects

J S Simon

Publications and source records attributed to J S Simon.

4 recordsLinked to original sources

PubMed1992

Characterization of a vasopressin-like peptide in rat and bovine blood vessels.

The present study examined the possibility that blood vessels of the rat and cow contain arginine vasopressin (AVP) and that the vascular stores of this potent vasoconstrictor are of local, rather than blood-borne, origin. Vessels from rat or cow were homogenized in acid, and the supernatants were assayed for AVP by radioimmunoassay. AVP immunoreactivity was detected in all vessels taken from the rat including aorta, mesenteric artery, renal artery, vena cava, and renal vein, as well as atria of the heart and also in cow aorta. Blood vessels from hypophysectomized and Brattleboro rats also contained AVP at levels similar to those of intact control rats. Further characterization of this immunoreactive material showed that, in both radioimmunoassay and radioreceptor assay, vascular extracts produced competition curves, which were parallel to those of synthetic AVP. Additionally, immunoreactive AVP in aortic extracts comigrated with synthetic AVP and pituitary extract on both high-pressure liquid chromatography and Sephadex G-25 chromatography. Furthermore, intravenous administration of the aortic extract produced pressor responses in conscious rats, and these responses were significantly attenuated by pretreatment with a specific AVP V1-receptor antagonist. These data demonstrate that blood vessels contain an AVP-like peptide that appears indistinguishable from authentic AVP and further suggest that this vascular peptide is of local origin.

Animals↗

PubMed1991

The detection of depression by patient self-report in women with gynecologic cancer.

We examined the utility of patient self-report forms in identifying those gynecologic oncology patients who would be diagnosed by an experienced consultation-liaison psychiatrist as suffering from major depression. Sixty-five women with gynecologic tumors were evaluated by a consultation-liaison psychiatrist, using standardized (DSM-III) criteria. Each patient also completed a Carroll Rating Scale for Depression (CRS). The CRS demonstrated sensitivity and specificity of 87 percent and 58 percent, respectively. Used as a screening instrument to rule out depression, the CRS yielded a negative predictive value of 94 percent. We identified a priori forty items from the CRS which should not be influenced by the non-psychiatric biologic effects of gynecologic tumors, and compared the performance of this non-cancer related symptoms subscale (NCSG) to that of the CRS. The NCSG did not significantly outperform the CRS; its sensitivity and specificity were 87 percent and 62 percent, respectively. Because our study population was relatively homogeneous (i.e., non-ovarian gynecologic oncology patients without severe debilitation who were not receiving chemotherapy, radiation therapy, or other invasive procedures), the findings should not be generalized to other oncologic populations at this time. Our results suggest that patient self-report forms can be effective screening devices for identifying those non-ovarian, gynecologic oncology patients who should then be carefully evaluated for coexisting clinical depression.

Adult↗

PubMed1976

Changes in occupation after aortocoronary vein-bypass operation.

The effect of aortocoronary vein-bypass operation on changes in occupational status was investigated in a cohort of 893 men. The median period of time between the operation and follow-up evaluation of postoperative occupational status was 14 months. The patients were divided into two age groups, with 55 years as the dividing point. The results showed that 11% of the younger men and 26% of the older group who were employed before the operation retired following the operation. In addition, 30% of the patients changed their occupational status following the operation. When occupational changes also resulted in changes in physical demands, 49% of the patients took new jobs that were less demanding physically, while 40% took jobs that were more demanding. Close to 9% of the patients were retired prior to the operation; about one fifth of them came out of retirement following the operation.

Adult↗

PubMed1976

Constrictive pericarditis.

A patient with constrictive pericarditis following an open-heart operation without sepsis is discussed. In the absence of sepsis, it has been widely held that this complication does not develop following an open-heart procedure. The fatal outcome in this patient could have been avoided had such an association been known.

Aortic Valve↗