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Biomedical subjects

M Camici

Publications and source records attributed to M Camici.

89 records · Page 5Linked to original sources
PubMed1982

Echocardiographic hemodynamic study during ultrafiltration sequential dialysis.

4 patients on regular dialysis were studied by the echocardiographic method during ultrafiltration and dialysis performed sequentially according to two different protocols. Blood pressure, heart rate, cardiac output, stroke volume, systolic and diastolic dimension of the left ventricle, systolic and diastolic volumes of the left ventricle, ejection fraction, shortening fraction and total peripheral vascular resistance index were measured. During ultrafiltration there is an increase of the total peripheral vascular resistance index. Myocardial contractility improves only during dialysis. Physiopathologic implications are discussed.

Adult↗
PubMed1982

Urinary excretion of oxalate in renal failure.

The daily urinary excretion of oxalate has been found to be lower than normal in patients with renal failure and the decrease to be directly proportional to the impairment of renal function. It has also been found that the gut flora from uremic patients destroys oxalate 'in vitro' more efficiently than the gut flora from normal people. It is postulated that an adaptation occurs in the gut flora of uremics to 'metabolize' oxalate, and this enteric elimination may account for its decreased urinary excretion.

Humans↗
PubMed1981

[Echocardiographic study of left ventricular function in 2 different procedures].

Four patients on regular dialysis were studied by echocardiographic method during ultrafiltration sequential dialysis performed according to two different protocols: procedure 1: ultrafiltration alone (1 hour) followed by diffusive dialysis (3 hours); procedure 2: dialysis (3 hours) followed by ultrafiltration alone (1 hour). Blood pressure, heart rate, cardiac output, stroke volume, systolic and diastolic dimension of the left ventricle, systolic and diastolic volumes of the left ventricle, ejection fraction, shortening fraction and total peripheral vascular resistance index were measured. During ultrafiltration there is an increase of the total peripheral vascular resistance index. Myocardial contractility improves only during dialysis. Physiographic and therapeutic implications are discussed.

Adult↗
PubMed1979

[Enzymologic characterization of adenosine nucleosidase of medicinal plants (Medicago sativa)].

Adenosine nucleosidase (adenosine ribohydrolase, E C 3.2.2.7) was purified from alfalfa leaf juice. The final preparation shows a single band on polyacrylamide gel electrophoresis; the enzyme activity is stable for 12 hrs between pH 5.5 and pH 8.5, but is completely lost on heating at 55 degrees C for 10 min. Optimal pH for the hydrolysis of adenosine is between pH 5 and pH 6. Among nine purine nucleosides tested, only adenosine, 2'-deoxyadenosine and purine riboside were hydrolyzed by the enzyme preparation. A Km value of 7 x 10(-6) M was found with adenosine as substrate at pH 7.4. Of the two reaction products, adenine exerted a weak inhibitory effect, while D-ribose was without effect on the initial rate of adenosine hydrolysis. The data reported are compared with those obtained on the enzymes from other plant sources.

Adenosine↗
PubMedDate not supplied

Prostacyclin and heparin during haemodialysis: comparative effects.

Haemodialysis was performed using heparin (dialysis I: heparin regimen 1, 2000 U/h) in ten patients. These subjects were then given an infusion of prostacyclin, in the form of epoprostenol sodium salt (dialysis II: prostacyclin, 5 ng X kg-1 X min-1), followed by an infusion of prostacyclin and heparin (dialysis III: heparin regimen 2,500 U/h). Absolute platelet count, in vitro platelet aggregation and plasma beta-thromboglobulin decreased during prostacyclin infusion. Haemodialysis neutropenia was improved by prostacyclin. The membrane sieving coefficient factor and ultrafiltration volume were not improved by prostacyclin alone (dialysis II). Prostacyclin together with heparin (dialysis III) showed, 60 minutes after the start, an unchanged sieving coefficient factor compared with that of heparin alone, while the ultrafiltration volume significantly (P less than 0.001) improved. The results of this study confirm those of earlier studies and suggest that prostaglandin I2 together with low-dose heparin improve the biocompatibility and efficiency of dialysis treatment.

Biocompatible Materials↗