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Biomedical subjects

E Arosio

Publications and source records attributed to E Arosio.

90 records · Page 5Linked to original sources
PubMed1980

[Incidence and antibiotic-sensitivity of gram-negative bacteria in the urinary infections (author's transl)].

Urinary tract infections due to low-grade pathogenic Gram-negative bacteria show an increasing prevalence. The frequency of isolation from urinary samples of some of these pathogens (Alcaligenes, Citrobacter, Acinetobacter, Providencia, Serratia) was detected in a group of adult patients. The role of local and systemic predisposing factors was investigated. These bacterial agents accounted for 21% of 1,354 isolated strains. Systemic predisposing factors were found in most patients. Moreover, a high proportion of the isolates was found in the urinary samples of patients receiving prolonged antibacterial therapy. Sensitivity to several antibacterial drugs was examined for each strain. A high degree of drug resistance was commonly found.

Anti-Bacterial Agents↗
PubMed1979

[Results of the use of a new aminoglycoside antibiotic, sisomicin, in gram negative bacterial respiratory infections].

Clinical efficacy of a new aminoglycoside antibiotic, sisomicin, was evaluated in 14 patients with acute chest infections (12 cases with pneumonia and 2 with bronchitis). They were selected taking into account the isolation of sisomicin-sensitive Gram-negative bacilli in a sputum specimen collected prior to therapy. Local predisposing factors were present in 4 patients whereas general predisposing factors were present in 4 patients whereas general predisposing factors were recognizable in 9. Klebsiella was isolated in 5 cases, E. coli in 5 cases, Proteus in 4 cases, P. aeruginosa in 2 cases, Ct-trobacter and Providencia each in one. In all patients the bacteriological finding was negative after the cycle of therapy; clinical outcome was uniformly favourable (11 patients healed, 3 got better). No significant adverse effects due to the antibiotic was noted.

Adult↗
PubMed1978

Urinary kallikrein excretion and plasma renin activity in patients with essential hypertension and primary aldosteronism.

1. The 24 h urinary excretion of kallikrein has been studied in 40 normotensive control subjects and in 74 age-matched patients with essential hypertension under similar conditions. By use of the renin-sodium index, hypertensive patients were divided into two subgroup: low-renin hypertension and normal-renin hypertension patients. Urinary kallikrein determinations were also obtained from six hypertensive patients with primary aldosteronism. 2. Urinary kallikrein was significantly lower both in patients with normal-renin and low-renin essential hypertension. Urinary kallikrein excretion was very high in the patients with primary aldosteronism. 3. In nine hypertensive patients beta-adreno-receptor-blocking therapy caused a significant decrease of plasma renin activity, but had no significant effect on urinary kallikrein excretion. 4. The results support the concept that low urinary kallikrein is likely to be a marker of essential hypertension. Under certain conditions its excretion is positively related to mineralocorticoid hormone concentrations but it is not primarily related to the renin-angiotensin system.

Adult↗
PubMed1976

Urinary and kidney kallikrein in hypertensive rats.

Urinary and kidney kallikrein were studied in rats with renal clip hypertension. The effect of protease inhibitors on urinary and kidney BAEE esterase activity was similar. Both hypertensive and not hypertensive operated rats excrete significantly less kallikrein than controls; in the ischaemic kidney kallikrein is diminished whereas is not increased in contralateral. Kallikrein is therefore related to renal functional mass but does not seem responsible for a natriuretic effect.

Animals↗
PubMed1976

[Behaviour of urinary excretion of lysozyme in renal diseases and in urinary tract infections (author's transl)].

Urinary excretion of lysozyme was investigated in a group of 66 patients with various renal diseases, nephrolitiasis and urinary tract infections. The results obtained demonstrate that the amount of the enzyme excreted is related to the entity of tubular damage whereas is not with glomerular damage. No correlation was found between lysozyme excretion neither to the degree of proteinuria neither to the amount of leukocytes and bacteria in the urine. In patients with urinary infections urinary lysozyme increases only when there is a tubular injury of some entity. In 90 pediatric patients with urinary infection and pyelonephritis lysozyme in the urine was found only in two cases. Therefore urinary lysozyme determination cannot be considered for the detection of early tubular injury and is not a helpful diagnostic tool in urinary tract infections.

Adolescent↗
PubMedDate not supplied

A computer-assisted study of macrophage behavior in HBV and nAnB related infectious chronic active hepatitis.

Activated intralobular macrophages were quantified as their lysozyme contents in liver biopsies from patients with chronic HBV and nAnB active hepatitis, and subjects with no evident liver histological damage. There were more macrophages (0.62 +/- 0.06/2,500 mu 2) with a larger area (20.36 +/- 0.87 mu 2) in HBV-related chronic active hepatitis than in controls (0.21 +/- 0.04/2,500 mu 2 and 16.01 +/- 1.48 mu 2), whereas in nAnB chronic active hepatitis their numbers were similar to that in the controls (0.22 +/- 0.03/2,500 mu 2) and their area was smaller (11.68 +/- 0.79 mu 2).

Biopsy↗
PubMedDate not supplied

Liver system. V. Activation-extinction line of cyclic hepatocyte activities.

The excitation-extintion line of hepatocytes from an inert state towards the stabilization of a given activity is described. Within the cell, the switching on of any given activity is a competitive process among different activities. The process is driven by the influence field created in the environment of the Rappaport acinus by sinusoidal blood which changes its characteristics during its passage from the portal zone to the central vein. Every step of the excitation-extintion pathway follows the so-called law of autoisodiasostasis (AIS), i.e. it is characterized by an oscillatory motion between restoring (homopoiesis or HP) and working (homeorhesis or HR) states. Since the cyclical bistable equilibrium of AIS characterizes all conditions of hepatocyte activities, the AIS cycle can be defined a limit cycle.

Humans↗
PubMedDate not supplied

Clinical and circulatory effects of Iloprost either administered for 1 week or 4 weeks in patients with peripheral obstructive arterial disease at Leriche-Fontaine stage III.

BACKGROUND: Iloprost therapy for severe peripheral obstructive arterial disease (POAD) has demonstrated to be effective in reducing the need for amputation. However the feasibility of a 28-day infusion regimen in less severe stages of the disease is poor due to the length in hospital stay. A randomized, controlled, parallel-group pilot study was carried out with the aim to evaluate clinical and circulatory effects of Iloprost, a stable prostacyclin analogue, administered with two different infusion schedules to patients with POAD at Leriche Fontaine stage III. METHODS: Twenty patients 16 males and 4 females, mean age 66 +/- 6 years) with objective signs of POAD, rest pain for at least two weeks and posterior tibial artery pressure > 50 mmHg, were randomized to either Iloprost i.v. infusion up to 2 ng/Kg/min for 6/h/day for 28 days (Group A) or to Iloprost i.v. infusion up to 1.5 ng/Kg/min for 16/h/day for 7 days (Group B). At baseline (before starting first infusion) after 7 days (for group B only, end of therapy) and after 28 days (end of therapy for Group A, end of study for Group B) the following parameters were evaluated: walking distance, rest pain and analgesic consumption, plethysmographyc parameters (first flow, peak flow and peak flow time) and laser Doppler parameters (rest flow, post ischemic flow). RESULTS: After 28 days, both Iloprost infusion schedules increased walking capacity (maximum walking distance/pain free walking distance +119/+84% +199/+85% respectively, for Group A and B respectively) reduced ischemic pain (-45% and -48% respectively for Group A and B) and analgesic consumption and improved plethysmographyc and laser Doppler parameters. Tolerability seemed to be better in Group B, suggesting that the lower dose and the shorter duration of the therapy period might result in reduced incidence of headache thus, in principle, increasing patient acceptability. CONCLUSIONS: The results of this pilot study, if confirmed by larger trials, could have important positive implications in terms of costs, patient comfort and management.

Aged↗
PubMedDate not supplied

[Endothelial function and the microcirculation in diabetes mellitus].

The role of endothelial dysfunction in the pathogenesis of diabetic microangiopathy is reviewed. Reversible alterations in microcirculation, consisting of increased capillary pressure, blood flow and endothelial permeability, can be detected at an early stage in diabetes mellitus. Irreversible structural modifications of the vascular wall, such as thickening of the basal membrane due to the extracellular accumulation of proteins, take place at later stages. Atherosclerosis further affects microcirculation in diabetes mellitus by decreasing autoregulatory capacity and blood flow reserve. Endothelial dysfunction has been observed to precede the onset of microvascular lesions, as demonstrated by reduction in the vasodilatory response to vasoactive agents and by alterations in the antithrombotic properties of the endothelium. Experimental data available so far suggest that endothelial dysfunction may be directly related to hyperglycemia. Abnormalities in lipoprotein metabolism, generation of glycation end products, and increased oxidative stress may also be responsible for the endothelial dysfunction in diabetes mellitus. Insulin resistance appears to be related to endothelial dysfunction in non-insulin-dependent diabetes mellitus through a reduction in the biological activity of endothelial-derived nitric oxide.

Animals↗
PubMedDate not supplied

Evolution of carotid atheromatous lesions in endarterectomized patients.

A noninvasive follow-up using duplex ultrasonography was conducted in 128 patients who had undergone carotid endarterectomy from January 1987 to December 1988. Repeated scans of the operated area revealed a distinct increase in thickened ultrasonographic features (32% vs 8%), and a stenosing lesion was detected in 8 patients. There was also a parallel increase in the number of subjects with thicknesses of the intima adjacent to the endarterectomy area exceeding 2.5 mm. In 7% of cases, dilatation was detected in the operated area and in 27% the margin of the area was raised. The study also dealt with the contralateral carotid artery, where a progression of atheromatous involvement was observed with an increased number of cases of hemodynamically significant stenosis and 3 cases of occlusion. Periodic duplex ultrasonography in endarterectomized patients proves useful for the early detection of hemodynamically significant stenoses or of structural features potentially capable of generating emboli.

Aged↗
PubMedDate not supplied

Effects of sustained-release isradipine on blood pressure and peripheral hemodynamics in hypertensive patients.

In a double-blind crossover study, 16 hypertensive patients (mean age, 41 years) were randomly assigned to receive placebo or 5 mg of an extended-release formulation of isradipine for 30 days. Blood pressure and heart rate were recorded by an automatic device and hemodynamics measured by a duplex scanner and plethysmography. After the first dose and after 30 days' treatment with isradipine, blood pressure was significantly reduced (mean arterial pressure 4 hours after the first dose, 106 +/- 3 vs 120 +/- 4 mmHg, P < 0.01; 22 hours after the last dose, 108 +/- 3 mmHg, P < 0.01) with no significant changes in heart rate. The compliance of the brachial artery was significantly increased (2.823 +/- 0.358 vs 1.204 +/- 0.156 dyn-1.cm4.10(-7), P < 0.002) and the characteristic impedence decreased (49 +/- 6 vs 91 +/- 12 dyn.s.cm-5.10(2), P < 0.05) as well as local resistances (71 +/- 5.6 vs 198 +/- 18 mmHg.ml-1.s, P < 0.001). After 30 days of isradipine treatment, 22 hours after the last dose, compliance was still increased (2.575 +/- 0.453 dyn-1.cm4.10(-7), P < 0.01) whereas impedance and forearm vascular resistances were reduced (59 +/- 8 dyn.s.cm-5.10(2), P < 0.05, and 97 +/- 14 mmHg.ml-1.s, P < 0.001, respectively). The results indicate that sustained-release isradipine ensures good blood pressure control up to the time of the following dose and restores the large artery dumping function against cyclic variations in intraluminal pressure.

Adult↗
PubMedDate not supplied

[Considerations on the bacterial flora in patients with infections of the respiratory tract and in immunosuppressed patients (author's transl)].

Epidemiological features of pathogenic mycetes have been investigated with regard to their relationship with bacterial flora in patients with acute and chronic bronchopulmonary diseases and in immunosuppressed patients. Opportunistic mycetes (Candida and Aspergillus) have been found frequently associated with Gram-negative pathogenic bacteria. In immunosuppressed patients, the plenty of mycetic flora is related to the degree of immunoglobulin deficiency especially to the IgG and IgA levels.

Aspergillus↗