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Biomedical subjects

P Rosselli

Publications and source records attributed to P Rosselli.

At least 19 recordsLinked to original sources
PubMed1996

[Postischemic dysfunction and persistent ischemia in the early postinfarction period. Evaluation by echo-dobutamine-atropine test].

AIM: To study post-ischemic dysfunction and persistent ischemia in early post-infarction, by means of Echo-dobutamine-Atropine stress test (ECHO-DOB). Methods. We studied 138 patients (pts) aged < or = 75 yrs (mean 59.2 +/- 9.8) at their first uncomplicated myocardial infarction (AMI), treated with systemic thrombolysis. All pts underwent the test within 2 weeks since the onset of the attack and they were reevaluated in follow-up 3 months later. Under Echo and ECG monitoring, ECHO-DOB was performed according to EDICS protocol. Low doses was infused (5-10 mcg/Kg/min every 3') to assess the viability and high doses (20 > or = 40 mg/Kg/min + Atropine) to assess a possible persistent ischemia. The Wall Motion Score Index (WMSI) was used for the semiquantitative analysis of kinesis in a model of left ventricle divided into 16 segments. coronary angiography was performed within 30 days from the AMI, in 82.3% of pts. Results. Low dose of Dobutamine (DOB) induced in 92/136 (67.6%) pts an improvement in the contractile dysfunction in the region of necrosis; in 31.5% (29/92) it remained until the end of the test, suggesting the presence of viable myocardium, In absence of myocardium "at risk". High doses DOB induced worsening of contractile dysfunction in 64 pts (47%); in 40 (62.5%) viability had been previously detected (viable but ischemic myocardium); In 30 (75%) it was homozone or adjacent (viable but ischemic myocardium in the region of the coronary artery or in the tributary vessels correlated to the necrosis). In 24/64 (37.5%) pts the absence of modification of WMSI (no improvement and no worsening), suggested the presence of necrotic tissue in the tributary region of the vessel of necrosis. The significant improvement in kinesis revealed in 92 pts, by the follow-up control was confirmed in 64 (p < 0.001) (69.5%). Forty-four pts without hyperkinesia showed no significant improvement compared with the base line (stunned or hibernating myocardium). The sensitivity of low doses for viable myocardium (gold standard follow-up) was 69%; specificity was 77%. The sensitivity of high doses for ischemia (gold standard coronary arteriography) was 78%; specificity was 100%. No major side effects during the Dobutamine Atropine test were observed. CONCLUSIONS: The ECHO-DOB test in the post-infarction period allow the assessment of the functional significance of what is the objectified by coronary angiography and identifies pts at risk of more serious events. An integration of the test with the angiographic data can direct towards more suitable therapeutical or surgical choices.

Adult↗
PubMed1995

Relationship between HDL-cholesterol and apolipoprotein A1 and the severity of coronary artery disease.

INTRODUCTION: We investigated whether apolipoprotein A1 (ApoA1) could better identify patients with severe vessel damage than HDL-cholesterol in a population with recent acute myocardial infarction (AMI). METHODS: One hundred and forty-one male patients (mean age: 54.3 +/- 7.3 years) who had undergone coronary angiography within 3 weeks of an AMI were studied. Coronary angiography data were evaluated both anatomically (as single, double or multivessel disease) and by means of the Gensini score. The main lipid parameters were evaluated on admission to the Coronary Care Unit. RESULTS: ApoA1 and the ApoA1/ApoB ratio (A1/B) mean values were significantly (P < 0.05) different when patients were divided on the basis of HDL-cholesterol cut-off value (35.0 mg.dl-1); when divided on the basis of Gensini score (< or = 18 or > 18), there was a statistically significant difference for ApoA1 (P < 0.01), HDL-cholesterol and A1/B (P < 0.05): only this latter was able to discriminate between the two groups. The mean ApoA1 and A1/B (P < 0.01), Gensini score (P < 0.001) and total cholesterol/HDL-cholesterol (P < 0.05) values of patients in the single-vessel disease group differ from those both of double- and multivessel disease groups. A1/B is also able to discriminate between single- and double-vessel disease. DISCUSSION: Our results confirm that ApoA1 and ApoA1/ApoB ratio are better than HDL-cholesterol in assessing the severity of coronary damage.

Adult↗
PubMed1994

[Identification of ischemic and/or viable myocardium in early post-infarction period using echocardiographic imaging technique. Comparison of 2 tests: echo-dipyridamole and echo-dobutamine].

AIM OF THE STUDY: To compare two stress tests: Dipyridamole-echocardiography (ECHO-DIP) and Dobutamine-echocardiography (ECHO-DOB) with angiographic data (still "gold standard") in early postinfarction period in order to identify ischemic and/or viable myocardium (considering the echocardiographic follow-up as "gold standard"). METHODS: 40 consecutive patients (pts), mean age 56, at their first uncomplicated acute myocardial infarction (AMI) treated with thrombolytic agents were studied. All underwent coronary angiography. RESULTS: The ECHO-DIP test resulted positive in 17 pts for transient regional asynergy (homozone 13/17; heterozonal positivity 4/17). The mean basal Wall Motion Score Index (WMSI) was 0.46 +/- 0.30 and at asynergy was 0.58 +/- 0.33 (p < 0.001). The ECHO-DOB test resulted positive in 20 pts; mean basal WMSI was 0.42 +/- 0.31 and at asynergy 0.55 +/- 0.35 (p < 0.001). Both tests were positive in 14 pts; the site of regional asynergy was the same in each test. During ECHO-DOB hypercinesia appeared in 27/39 pts (WMSI form basal 0.42 +/- 0.31 to 0.22 +/- 0.21 p < 0.001). Recovery of contractile function seems to identify viable myocardium: viable tissue shows early functional recovery during ECHO-DOB infusion. In 14 pts it remained until the end of the test, and in 12 it was transient, denoting the presence of myocardium "at risk". Remote (3- or 6-month) clinical and echocardiographic follow-up were carried out in all pts (25 undergoing medical therapy and 15 after PTCA or coronary bypass). In 26 pts with hyperkinesia at ECHO-DOB, basal echocardiogram revealed improvement of WMSI from 0.42 +/- 0.31 to 0.32 +/- 0.29 (p < 0.001). CONCLUSIONS: "Passive" ECHO-stress tests in the early postinfarction period are easy to perform and free of major risks, they allow pts at risk due to residual ischemia to be revealed with a high degree of specificity and sensitivity. The improvement of kinesis during inotropic stimulus of Dobutamine suggests stunned or hibernating myocardium.

Adult↗
PubMed1988

Hemodynamic changes during acetate dialysis, bicarbonate dialysis and hemofiltration.

Twenty uremic patients submitted to three different dialytic procedures (6 patients to acetate dialysis, 8 patients to bicarbonate dialysis, 6 patients to hemofiltration) were monitored in respect to the hemodynamic parameters recorded with a thermistor Swan-Ganz catheter. During acetate dialysis there was an increment of cardiac index (CI) up to positive values (+4.8%), while resistance index (RI) decreased progressively until it reached -16.5%. During bicarbonate dialysis CI, after an initial fall, remained constant and RI increased (+8.6%). During hemofiltration CI decreased constantly throughout the entire procedure while RI increased until +12.9%. We concluded that during diffusive transport the buffer used plays an important role in determining hemodynamic responses to fluid removal; during convective transport vascular resistance increases in spite of acetate.

Acetates↗
PubMed1986

[Frequency of isolation and drug resistance of bacterial strains isolated from respiratory material in patients with cystic fibrosis].

During 1985, 251 respiratory samples from 61 patients were examined at the tuscan cystic fibrosis Center (Florence), and isolated strains were tested against various antimicrobial drugs. Pseudomonas aeruginosa and Staphylococcus aureus were the predominant pathogens isolated. Infections caused by St. aureus were the commonest during the first years of life, whereas those caused by Ps. aeruginosa, occasional at early age, became chronic and the main source of infection with growth. Sensitivity testings against antibiotics confirmed that Ps. aeruginosa isolated from cystic fibrosis patients has a high percentage of resistant strains. The most active drugs were ceftazidime and aztreonam. An increased resistance to aminoglycosides was observed.

Adolescent↗
PubMed1983

[Spiro-ergometric evaluation of a group of healthy young subjects: sedentary females, sedentary males and practicing male sports amateurs (jogging)].

In order to assess the qualitative and quantitative differences in physical performance, twenty sedentary females (Group A), twenty sedentary males (Group B) and twenty amateur sportsmen who jogged 45-60 min 2-3 times a week (Group C), have been evaluated by spiroergometric test on bicycle ergometer. At the submaximal level of 90 Watts the cardiorespiratory efficiency, as reflected by the values of double product (DP) and ventilatory equivalent (VE) was statistically different in the three Groups (A less than B less than C). At the maximal work the females, compared to sedentary males, achieved lower values (P less than 0.001) of maximal working capacity (MWC), total work (TW), systolic blood pressure (SBP), maximal O2 uptake (VO2 max), O2 pulse (O2P) and a greater (P less than 0.001) energetic cost (EC = HRmax/TW): sedentary males, compared to amateur sportsmen, achieved lower values (P less than 0.001) of MWC, TW, VO2 max, O2P and greater values (P less than 0.001) of VE, EC, HR, and DP (P less than 0.02). The lower VO2 max in females can be mainly ascribed to the lower stroke volume which in turn correlates with smaller body surface area. The greater VO2 max and O2P max of amateur sportsmen can be ascribed to larger stroke volume and muscular O2 uptake brought about by jogging. Furthermore the females, compared to sedentary males, have achieved VO2 max and O2P max that were 29% lower, a TW 43% lower, while EC was 73,4% higher. The sedentary males, compared to amateur sportsmen, have achieved lower values of VO2 max (-14,3%), O2P max (-17,5%) and TW (-31,3%) with DP and EC 8,3% and 50,7% higher, respectively. On the grounds of these data sedentary subjects, particularly females, pay a high energetic cost during physical activity. The practice of an aerobic sport such as jogging, may notably increase cardiovascular and respiratory efficiency.

Adult↗
PubMed1976

[The apexcardiogram in acute myocardial infarct].

The relation between intracardial haemodynamics and apicocardiogram (ACG) parameters is explained. A wave (amplitude and duration), A/H ratio, true and total TCI, total systole, total expulsion, RIV, RFW, TE/TCI (total) and TE/TCI (true) findings in 22 patients with acute myocardial infarct are presented. Attention is also given to clinical and radiological signs of cardiac insufficiency and the infarct site. Constant and significant increases in the A wave, A/H ratio and RIV, together with a decrease in total expulsion, were noted, particularly in cases with clinical evident insufficiency. In the pre-expulsive stage, ACG Data could not be taken as a reliable index of myocardial contractility in cases where insufficiency was not manifest. It is felt, therefore, that ACG may be of assistance in the evaluation of changes in myocardial performance, even where clinical and radiological signs of decompensation are absent.

Aged↗
PubMed1975

[Behaviour of left ventricular systolic time intervals after isometric exercise in patients with ischemic heart disease (author's transl)].

The authors describe differences in behaviour of left ventricular systolic time intervals after isometric exercise between patients with ischemic heart disease and normal control. Isometric exercise consists of tonic hand-grip, which is to be gauged by hand-grip dynamometer for 5 minutes at 30% of the patient's maximum voluntary contraction or for 2-3 minutes at 50%. The parameters referred to are pre-ejection period and left ventricular ejection time index (PEPI, TETI), the PEP/TET ration, heart rate and arterial pressure. The authors conclude that from isometric exercise it is possible to point out the heart failure degree in patients with ischemic heart disease.

Blood Pressure↗