PubMed Health⌕ Search

Biomedical subjects

C Contini

Publications and source records attributed to C Contini.

At least 73 records · Page 4Linked to original sources
PubMed1979

Superior vena cava stenosis at site of intersection of two pacing electrodes.

Superior vena cava obstruction is described in a patient with two endocardial pacing electrodes. At necropsy a severe stenosis of the venous lumen was found at the site of intersection of the two catheters. There was no evidence of thrombus formation. Venous wall stenosis is an unusual complication of transvenous pacing and is probably favoured by the presence of two electrodes.

Constriction, Pathologic↗
PubMed1979

[Kinetics of the biliary system (author's transl)].

A dynamic study of the hepato-biliary system was carried out by means of HIDA-99mTc and of a gamma-camera. The study was performed in basal conditions and after administration of a fatty meal. Normal subjects and patients suffering from various diseases of the biliary system were examined. The method is simple and well tolerated. Three mechanisms are invoked and discussed concerning the kinetic reactions of the gall bladder and the biliary ducts.

Biliary Tract↗
PubMed1978

Chronic hemodynamic effects of propranolol treatment in dialysis-refractory hypertension.

The hemodynamic mechanism of the hypotensive effect of propranolol was studied by quantitative radiocardiography in 8 patients with dialysis-resistant hypertension. Propranolol treatment brought about a decrease in mean arterial pressure and peripheral vascular resistances. The cardiac index was slightly reduced only in the early stage of the treatment. No significant difference was found between patients on treatments lasting longer than 3 months and patients with dialysis-controlled hypertension. The results show that propranolol can be used safely as the sole antihypertensive agent in patients with dialysis-resistant hypertension.

Adult↗
PubMed1978

Measuring the stimulating energy threshold in living tissues.

The paper summarizes the various methods of measuring the stimulation threshold in living tissues and emphasizes the usefulness of energy measures. An analog instrument for the direct measurement of the energy threshold is proposed and some experimental results obtained by its clinical application are reported.

Electric Stimulation↗
PubMed1978

[Clinical experience with permanent cardiac stimulation in the Department of Medical Pathology of Pisa University (author's transl)].

Experience with about 1500 electrostimulated patients is reported. Rather than give statistical data we have preferred to go briefly through the problems encountered in the course of our experience and suggest possible solutions. We have emphasized the following aspects: ventricular-triggered pacemaker, stimulation threshold, haemodynamic behaviour of the paced patient, problems concerning implanted pacemakers follow-up. Our 13 years experience has opened new prospects which deserve further study, such as programmable pacemakers, optimal generator life and a few important aspects in follow-up techniques.

Cardiac Pacing, Artificial↗
PubMed1978

[The Italian experience in permanent pacing. A casuistry for more of 10 years: a policentric study (author's transl)].

According to a recent national survey, 387 patients were treated by permanent pacing in 10 Italian centers, between 1961 and 1966. Of these patients 205 have died; 131 (77 males and 54 females) are still alive and no informations could be obtained for the remaining 51 (13%). The overall survival of patients treated during this period of time is therefore not less than 34% which is comparable to that of general population of the same age group. The 131 patients still alive have totaled 1,486 years of pacing and have used up to 784 pacers. Comparing the incidence of the most common causes for replacement during the periods 1961-66 and 1973-77, electrode failures dropped from 21 to 0.9%; circuitry malfunctions occurred in 10.5 and 7.8%; battery depletion rose from 36.8 to 69% of the cases. According to their clinical conditions, the 131 patients on long-term follow-up can be grouped as follows: 62% are in class 1 or 2 of NYHA; 26.7% are in class 3, and 3.8% in class 4. Moreover, 53.4% of patients are living an active life, having some sort of occupation and 29% are holding a driving license.

Aged↗
PubMed1978

[Measurement of the myocardial stimulation threshold in chronic and acute patients with pacemaker implanted (author's transl)].

Eighty-two patients, with electrodes implanted for varying periods of time, have been divided into three groups: acute (at implantation); intermediate (3 to 36 months) and chronic (37 to 124 months). In these groups, respectively 28, 26 and 28 myocardial stimulation threshold measurements have been performed. Measurements have been performed with MEEMR (Myocardial Excitation Energy Meter), an instrument deviced and built by the Institute of Elaboration of Information, CNR and University of Pisa. Microjoule has been chosen as unit of measure. More commonly used units of measure, such as threshold current in milliamp, have been calculated from values in microjoules. Mean values was 0.6 muJ in the first group, 6.9 muJ in the second one and 8.3 in the third one. Student test has been performed on such measurements, divided into groups, with the following results: p less than 0.01 between 1st and 2nd group, non significant difference between 2nd and 3rd group, p less than 0.01 between 1st and 3rd group. Such results suggest a trend toward myocardial threshold stabilization over a long period of time, as had already been hypothized by others Authors. Further useful information may be drawn from these data if they are evaluated in relation to a life-time pacemaker, as is nowadays desirable in view of recent progress in circuit technology and energy sources.

Cardiac Pacing, Artificial↗
PubMed1978

[The diagnosis of myocardial infarction in the presence of disorders of ventricular activation for right endoventricular pacing and left bundle branch block (author's transl)].

The Authors have studied the vectocardiogram in left bundle branch block, right endoventricular pacing, myocardial infarction and right endoventricular pacing, myocardial infarction and left bundle branch block. Vectocardiographic loop analysis allows the diagnosis of myocardial infarction both in the presence of endoventricular pacing and in the presence of left bundle branch block.

Bundle-Branch Block↗
PubMed1978

[Stenosis of superior vena cava at the crossing site of two catheters (author's transl)].

A case of superior vena cava syndrome is described in a patient with two endocardial pacing electrodes. At autopsy a severe stenosis of the venous lumen was found at the crossing site of the two catheters. There was no evidence of thrombus formation. Venous wall stenosis is an unusual complication of transvenous pacing and is probably favoured by the presence of two electrodes.

Cardiac Pacing, Artificial↗