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At least 217 records · Page 12Linked to original sources

PubMed1982

[Central dopaminergic function in stroke-prone spontaneously hypertensive rats (SHRSP): II. Effects of chronic treatment with lisuride on the impaired swimming ability].

Eight month-old SHRSP were treated s.c. with lisuride (50 micrograms/kg per day) for 5 weeks to examine the effect of the central dopaminergic agonist on the deterioration of swimming ability that occurred and progressed under persistent hypertension. General observations on signs and symptoms and histopathological examinations were also carried out with the same rats to evaluate the drug effect on the deterioration of hypertensive symptoms. The poor swimming performance of hypertensive SHRSP was improved significantly by the direct action of lisuride with a maximal effect at the 2nd week of the treatment, although the progress of the deterioration itself was not prevented by the chronic treatment. One week after the drug treatment, 2 out of 8 rats in the control group but none in the lisuride-treated group exhibited the abnormal behavior with aggressiveness, a typical sign of the occurrence of cerebrovascular lesions. Furthermore, macroscopic and histopathological examinations carried out 2 weeks after the drug treatment revealed that severities of the histopathological lesions such as myocardiac necrosis and arteriolosclerosis in the kidney, adrenal and testis were significantly lower in the lisuride-treated group than in the control.

Adrenal Glands↗

PubMed1981

Radiotherapy as a cause of complete atrioventricular block in Hodgkin's disease. An electrophysiological-pathological correlation.

A 20-year-old man contracted Hodgkin's disease and was treated with mantle radiotherapy. Heart block developed 11 years later. Electrocardiograms revealed predominant atrioventricular (AV) block and occasional AV conduction. Intracardiac electrograms demonstrated that the site of AV block was above the level of the His bundle. A permanent transvenous pacemaker was implanted. Seven months later the patient died of complications from cryptococcal meningitis. Pathological study of the heart revealed marked arteriosclerosis with fibrosis of the epicardium, myocardium, and endocardium. Examination of the conduction system revealed extensive arteriolosclerosis of the sinoatrial node and its approaches. In addition, there was marked fibrosis of the approaches to the AV node, the AV bundle, and both bundle branches. There was no evidence of Hodgkin's disease. This case documents the rare occurrence of AV block due to tissue destruction by radiotherapy. There was a good correlation between block proximal to the His bundle recording site and fibrosis of the approaches to the AV node.

Adult↗

PubMed1981

[Cervico-encephalic vascular ultrasonography Doppler examination and ophthalmoscopy (author's transl)].

99 non diabetic patients whose ocular examination showed characterized retinal arteriolosclerosis, with or without arterial hypertension, or macular alterations (senile degeneration, non aphakic retinal-vitreous interlayer syndrome, colloid degeneration) have been submitted to an cervico-encephalic vascular ultrasonographic Doppler examination. 25 to 56% revealed latent cerebral arteriopathy sometimes with arterial stenoses, peculiarly carotidal. Other 58, apparently healthy and likewise aged, tested in the same way, revealed only 12% notable arteriopathy.

Arteriosclerosis↗

PubMed1980

[The type of the diabetic retinopathy and the clinical picture of diabetes mellitus (author's transl)].

There are two groups of diabetics under report, group I comprising 70 cases of retinopathia simplex, group II 100 cases of retinopathia proliferans in the centre. Retinopathy, showing as first sign of angiopathy, offers a comparatively good prognosis for the overall case of diabetes since, normally, neither retinopathia proliferans nor glomerulosclerosis are apt to develop. The same, in a higher degree, applies to cases of simple retinopathy fully devoloped and verified through ten years, at least: Retinopathy then shows stationary, in fact regressive development, the attending nephropathy generally expressing itself by the benign form of pyelonephritis and arteriolosclerosis renum rather than by glomerulosclerosis. All this in sharp contrast to proliferating retinopathy. Coronary sclerosis, peripheral and cerebral sclerosis and, to a limited extent, arterial hypertension stand independent of that; they attract attention by noteworthy independence.

Adult↗

PubMed1994

The relationship between cholesterol and stroke.

Epidemiologic studies generally show no relationship or a weak relationship between total stroke and total blood cholesterol level. Several Japanese epidemiologic studies of hemorrhagic stroke indicate an increased risk at lower levels of blood cholesterol. However, these studies, which do not include many people with high blood cholesterol levels, do not show an increase in stroke rate at high blood cholesterol levels. The Japanese findings for hemorrhagic stroke were replicated by the Honolulu Heart Study in migrants from Japan, and in the MRFIT Screening Study. These studies also show an increase in nonhemorrhagic stroke at the highest, but not at intermediate, levels of blood cholesterol. An extensive pathologic study of the relationship of blood cholesterol to hemorrhagic and nonhemorrhagic stroke was carried out by Dr. Konishi of Osaka. The pathology was strikingly different in the two conditions, one being atherosclerotic in the larger arteries (5 mm diameter), the other arteriolosclerotic in the intracerebral arterioles (200 microns in diameter). The relationship between blood cholesterol and arterial lesions is inverse for arteriolosclerosis and positive for atherosclerosis. It is concluded that blood cholesterol influences the development of stroke above and beyond the influence of blood pressure. Furthermore, its influence is opposite for hemorrhagic and nonhemorrhagic stroke. The relationship between blood cholesterol and atherosclerotic stroke does not appear to be as strong as it is between blood cholesterol and coronary heart disease.

Aged↗

PubMedDate not supplied

Later complications on diabetic patients: nephropathies in necropsy material.

The purpose of the present study was to analyze in detail the kidney lesions of diabetic patients. Revision of the histopathologic aspects of this nephropathy was performed, seeking to approach the pathophysiology of its formation. In 200 consecutive necropsies of cadavers of diabetic patients examined at the Pathology Department of the Medical School of the São Paulo University, some degree of nephropathy was found in 158 cases. The slides from paraffin sections of these cases were reviewed according to a morphologic protocol previously established. Diffuse, nodular and mixed glomerulosclerosis were encountered in 42.2%, 21.5% and 5.7% respectively. Subcapsular drop and exudative lesion appeared in 12.7% and 15.2% of the cases. We also encountered arteriosclerosis in 81.6%, arteriolosclerosis in 88.6%, necrotizing papillitis in 11.4% and acute and chronic pyelonephritis in 23.4% and 20.9% respectively. We concluded that glomerular and vascular hyalin alterations were the most frequent findings in diabetic patients.

Adolescent↗

PubMedDate not supplied

Evaluation of chronic renal disease in heart transplant recipients: importance of pretransplantation native kidney histologic evaluation.

Although long-term use of cyclosporine has been implicated in the pathogenesis of arteriolar hyalinosis, interstitial fibrosis, and glomerulosclerosis observed in the native kidneys of heart transplant recipients, it is not clear that these histologic abnormalities are entirely specific for a drug-induced toxic nephropathy. The purpose of this study was to determine whether long-standing congestive heart failure, particularly when complicated by disease processes such as atherosclerosis and hypertension, may independently predispose to the development of similar renal histopathology. Records and specimens were selected from autopsy files for evaluation of clinical profiles and kidney histology in 16 patients who died of end-stage cardiomyopathy of varying causes without having recourse to heart transplantation. The study cohort consisted of 12 men and four women. Cardiomyopathies were the result of coronary artery disease in six patients and nonischemic causes in the other 10 patients. The mean age at the time of death was 53 +/- 3 years (range 28 to 74 years). Thirteen (81%) of 16 patients had a history of hypertension. Nadir serum creatinine concentrations during the month before death were 1.7 +/- 0.2 mg/dl (range 1.2 to 3.5 mg/dl). Interstitial fibrosis, tubular atrophy, and glomerulosclerosis were present in 15 (94%) of 16 patients. Arteriosclerosis and arteriolosclerosis were found in 13 (81%) of 16 and 14 (88%) of 16 patients, respectively. A nodular pattern of arteriolar hyalinosis was observed in two patients with ischemic disease.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗

PubMed1993

[Ultrastructural study on retinal arteriolar caliber irregularity in stroke-prone spontaneously hypertensive rats].

Ultrastructural changes in the arteriolar wall with caliber irregularity of spindle type, rosary type and diffuse dilatation type were studied in stroke-prone spontaneously hypertensive rats (SHRSP) aged 4, 6 and 10 months with systolic blood pressures of 210-240 mmHg by use of intravenously injected gelatin fluorescein preparation (IVGFP) and light and electron microscopy. Tridimensional graphic models were reconstructed from light micrographs of cross-sectioned serial preparations using a computerized micrograph-analyser. In the spindle type, I found markedly thickened media and smooth muscle cell necrosis at the narrowed portion of the arteriole central to the ampullar portion and a marked stretch and disappearance of the inner elastic lamina at the ampullar portion. These vascular changes of arteriolosclerosis were most advanced in the spindle type among three types of caliber irregularity. Tridimensional graphic models disclosed that there was no correlation between the wall thickening and luminal diameter of the arteriole. These results may explain the process of development of caliber irregularity in SHRSP.

Animals↗

PubMed1993

[Pathology of arteriosclerosis--an overview].

Arteriosclerosis is vascular disease characterized by thickening, hardening and remodelling of the arterial wall and classified into following three categories: atherosclerosis, Mönckeberg's medial calcific sclerosis, and arteriolosclerosis. Fibromuscular intimal thickening starts its development in the fetal age of the 6th month and continues to grow with aging. The specific topography of early atherosclerotic lesions is primarily attributed to wall shear stress, one of hemodynamic forces. The lesion will proliferate to form atherosclerosis when complicated by hyperlipidemia, hypertension, and/or other clinical risk factors. The major complications of atherosclerosis, stenosis of the arterial lumen and thrombus formation at ulcerated arterial walls, frequently cause such lethal diseases as ischemia of various pivotal organs or rupture of aneurysms.

Animals↗

PubMed1977

[Ultrastructural changes in the arterioles in hypertension in man].

Renal tissue obtained by means of biopsy or nephrectomy from 11 patients with various degrees of arterial hypertension was studied by electron microscopy. A distinct correlation was found between the level of arterial pressure and the degree of arteriolar lesions. According to the author, arteriolar damage in hypertension develops in two stages: 1. Hypertrophy of initmal and medial cells and hyperplasia of intracellular organelles. 2. Degeneration of the arteriolar wall with deposition of an electron dense material (hyaline) under the basal membrane and in the intercellular matrix of the media. The first stage may be regarded as an enhancement of the compensatory and adaptive processes in the arteriolar wall. The second stage is a manifestation of irreversible changes associated with the progression of the disease. The sequence is apparently common to all parts of the arteriolar system and to a certain extent it may be considered typical for the development of hyaline arteriolosclerosis. The penetration of blood plasma components and their deposition in the arteriolar wall depends, according to the author, on an increased intercellular and cellular permeability, and hypertension evidently enhances this process.

Adult↗

PubMed1996

Evidence and results obtained with a new trans-epidermal barrier (T.E.B.) drug in the medical treatment of vascular impotence.

After having reviewed the methods and significance of a new topical administration route for vasoactive drugs, the "Trans-Epidermal Barrier" (T.E.B.), based on the physiological capacity of phosphoric ester molecules (Phosphatidylcholine) to penetrate actively through the epidermal barrier, this paper reports the results obtained in the medical treatment of (micro) vasculogenic impotence with a preparation in the form of a 5% Lipogel, containing, as active principle, a Troxerutine/Phosphatidylcholine Complex. A total of 154 patients were subjected to "short term" treatment in order to quantitatively assess (computer assisted laser-Doppler: LDF) the response of the small arteries and arterioles in the dorsal penile region to pharmacological stimulation (microvasculokinesis test). This test enables separation of the patients into two groups: "responders" and "non-responders", according to which it is possible to instrumentally assess the severity of the anatomo-functional alteration of the small arteries and arterioles in penile microangiopathies originating from diabetes, arteriolosclerosis, hypertension and stasis. Microvascular damage was assessed objectively with the Optic Probe Video-Capillaroscopy, taking into consideration the number of microaneurysms and extension of the subischemic or ischemic areas. 75 "responder" patients undertook long term treatment for a minimum period of three months with the same preparation used for the microvasculokinesis test, at the dose of 2-3 topical administrations per day. The clinical parameters for the evaluation of efficacy were): a) number of spontaneous daily erections; b) duration of the erections; and c) penile rigidity; in addition to subjective elements such as recovery of satisfactory sexual activity consistent with the anatomo-functional damage. The response to the treatment was positive in 54 patients (72% of the cases). The clinical improvement was confirmed by the instrumental LDF results, that show a statistically significant increase (P < 0.0001) in the sphygmicity ("pumping function": inotropic potency of the arterio-arteriolar systole) of the small penile arteries, i.e.:92.63 +/- 26.1 at baseline to 177.6 +/- 74.5 after treatment. Follow-up continued in 15 patients for 6 months and in 11 patients for 12 months. Maintenance of the results was achieved by continuing treatment involving gradual reduction of the number of applications. The new route of application proposed by the authors and the investigation methods adopted for objective instrumental assessment of penile microcirculatory damage in (micro) vasculogenic impotence provides new perspectives from the diagnostic as well as the prognostic and therapeutical viewpoints.

Blood-Testis Barrier↗

PubMed1998

[Renal lesions in elderly patients with diabetes mellitus].

AIM: To elucidate the role of some renal diseases, pyelonephritis in particular, in elderly patients with type 2 diabetes mellitus (DM). MATERIALS AND METHODS: The trial included 150 patients with diabetes mellitus type 2 aged over 60 years with DM duration 16.6 +/- 7.8 years. All the patients underwent general clinical examination, Reberg-Tareev test, urine seeding, renal ultrasonography. RESULTS: The diagnoses associated with renal pathology were made in 75% of patients, the specific renal parenchymal damage (diabetic nephropathy-DN) proper was much less common (73 patients with type 2 DM). 16 of them were found to have chronic renal failure. The concurrent abnormalities included pyelonephritis (21%), urolithiasis (14%), renal cysts (19%), their combination (43%). Concomitant pyelonephritis had the most significant impact on renal function. Essential hypertension occurred in 65% of patients. CONCLUSION: In old age, renal damage specific for DM develops in the presence of pyelonephritis, cystic degeneration of the parenchyma, involutional processes, atherosclerotic and hypertensive arteriolosclerosis.

Aged↗

PubMed1998

Effect of ACE inhibition on myocardial ischaemia.

During ischaemia, both the circulating renin-angiotensin system and the local angiontensin converting enzyme are activated. The circulating renin-angiotensin system has a short-term role in the regulation of the cardiovascular system. Its aim is to restore blood pressure and cardiac homeostasis. Activation of the local system causes long-term regulation of cardiovascular homeostasis via sustained activation of local angiotensin and the gradation of bradykinin. This results in the secondary permanent structural changes that underline many aspects of coronary artery disease. Recently it has been shown that ACE inhibition is useful in the early and late phase of myocardial infarction. ACE inhibitors have been shown to reduce in vitro vascular hypertrophy and attenuate arteriolosclerosis and to maintain endothelial function. Interestingly, unexpected data from trials on heart failure have shown that patients receiving ACE inhibitors have a reduced incidence of infarction, hospitalization for cardiovascular disease and the need for coronary artery bypass surgery or angioplasty. As a consequence, several trials have been designed to assess the effect of ACE inhibition on the progression of coronary artery disease, as well as on its morbidity and mortality. The EUropean trial on Reduction Of cardiac events with Perindopril in stable coronary Artery disease (EUROPA) is one of these. This article summarised a number of independent and complementary mechanisms and points to the role played by ACE and ACE inhibition in coronary artery disease. In particular it considers the possibility that ACE inhibition improves endothelial function, exerts anti-atherogenic and anti-proliferation activity and modulates sympathetic activity.

Angiotensin-Converting Enzyme Inhibitors↗

PubMed1996

Intraglomerular fibronectin and laminin turn-over in chronically rejected kidney allografts in humans.

Chronic rejection is primarily responsible for the late loss of allografted organs and remains an important clinical problem. Chronic rejection in the kidney is characterised by arteriolosclerosis and nephrosclerosis, glomerulonephritis and interstitial fibrosis. Recently, a large number of studies have indicated that proteolytic enzymes play important roles as mediators of glomerular injury. The aim of the study was to assess intraglomerular fibronectin and laminin contents as well as cysteine proteinases in activity chronically rejected human kidneys. We investigated kidney tissue from graftectomy specimens obtained from 11 patients with end-stage renal disease following chronic rejection. A group of 9 patients undergoing nephrectomy because of cancer served as a control group, but only not involved parts of the kidneys were used. When intraglomerular laminin contents were related to DNA content, significant accumulation in chronically rejected allografts was found in comparison to controls (382 +/- 171 micrograms per microgram DNA and 190 +/- 82 micrograms per microgram DNA, respectively, p < 0.01. The accumulation of fibronectin was higher than in controls, however the difference was not significant. When proteinase activity was related to intraglomerular DNA content, significantly enhanced cathepsin B and L activity was found in rejected kidney allografts (57 +/- 16 nmol AMC/min per mg DNA) in comparison to controls (15 +/- 2 nmol AMC/min per mg DNA). Summarizing, we observed accumulation of fibronectin and laminin in glomeruli and simultaneously an excess of proteolytic activity in human chronically rejected kidneys. The above phenomenon indicates that a very active metabolic process takes place in glomeruli during rejection.

Adult↗

PubMed1950