1,721,065 research outputs found
The Future of Plastic Packaging: Economic and Environmental Issues
No full textThe paper analyses the economic aspects of the packaging industry, with particular enphasis on the role of plastic materials. Moreover, the article discusses the environmental problems and recycling issues
Correlation between angiographic success and functional improvement assessed by exercise test following percutaneous transluminal coronary angioplasty.
No full textCorrelation between angiographic success and functional improvement assessed by exercise test following percutaneous transluminal coronary angioplasty.
Barillà F, Romeo F, Tomai F, Pace V, Valente A, Martuscelli E, Nigri A, Reale A.
Source
2nd Department of Cardiovascular Diseases, University La Sapienza, Rome, Italy.
Abstract
Sixty-one consecutive patients with stable effort angina and single vessel disease underwent successful (reduction of coronary stenoses by greater than or equal to 20%) percutaneous transluminal coronary angioplasty (PTCA). Anatomical results were analysed on the basis of functional evaluation obtained by exercise test (ET) 1 week before (pre-PTCA) and within 1 month after (post-PTCA) PTCA. Total exercise duration and maximal double product significantly increased after PTCA (4.5 +/- 1 min vs 6.9 +/- 1.5 min, p less than 0.001 and 14.1 +/- 3.6 x 1000 mmHg x bpm vs 18 +/- 4.2 x 1000 mmHg x bpm, p less than 0.001). Pre-PTCA ET was positive in 43 patients (70%) and post-PTCA ET in 15 (24%). In patients with post-PTCA positive ET, mean stenosis diameter reduction was significantly lower than that obtained in patients with negative post-PTCA ET (29.6 +/- 8.9% vs 61.1 +/- 18.8%, p less than 0.001). In conclusion, PTCA improved exercise tolerance in the majority of patients with myocardial ischemia, however the definition of anatomical success used in this study appears to be poorly correlated with functional improvement as assessed by ET
Hypertrophic cardiomyopathy: is a left ventricular outflow tract gradient a major prognostic determinant?
No full textThe relationship of left ventricular outflow tract gradient as well as of clinical, ECG and haemodynamic data to presenting features and prognosis was evaluated in 125 consecutive patients with hypertropic cardiomyopathy, 79 men and 46 women (mean age: 34 +/- 7 years) studied between January 1970 and December 1985. Most clinical, ECG and haemodynamic findings were similar in the 44 patients (35%) with a pressure gradient (greater than or equal to 30 mmHg) and in the 81 patients (65%) without. Those with obstruction had greater ECG voltage SV1 and RV5; however, higher grade ventricular arrhythmias were more common in patients without obstruction. During a mean follow-up period of 7.6 +/- 4.5 years (range 2-18 years), death from a cardiac cause occurred in 28 patients (21 died suddenly) and was significantly less common in patients with a pressure gradient than in those without (11% vs 28%, P = 0.039). Univariate analysis of survival curves showed that the most powerful predictors of a poor prognosis were ejection fraction P = 0.0001), mean pulmonary artery pressure (P = 0.0001), dyspnoea (P = 0.001), left ventricular end-diastolic pressure (P = 0.002), complex ventricular arrhythmias (P = 0.029) and severe mitral regurgitation (P = 0.037). Using multivariate analysis, a decreased ejection fraction (P = 0.006) and a raised mean pulmonary artery pressure (P = 0.022) were the only independent prognostic determinants. Thus, the presence of a left ventricular outflow tract gradient does not seem of adverse prognostic significance. Risk factor characterization in patients with hypertrophic cardiomyopathy may be improved by assessment of ventricular arrhythmias in the context of left ventricular function
The effect of annealing, residual solvent, and preswelling on the thermal properties and sorption behaviour of poly (2,6-dimethyl-1,4 phenylene oxide) - Polystyrene Blends
No full text
Composizioni Polimeriche a Base di Policaprolattame
No full textBrevetto italiano, depositato il 6.7.1983 con il n. 21950 A/83, esteso a brevetto Europeo (Brev.Europeo n. 84105456.2
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