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Abstract:Abstract Increased QRS and ST-T micro-variability and ventricular late potentials are associated with an increased risk for malignant arrhythmias. However, the diagnostic power of the singular parameters is limited. In this study, we investigated the diagnostic ability of a linear combination of five (both variant and static) high-resolution ECG parameters. Continuous and signal-averaged ECGs were recorded from 51 healthy volunteers without any structural heart disease and with no cardiac risk factors and from 44 patients with coronary heart disease and ventricular arrhythmias. Beat-to-beat micro-variability measurement of the QRS complex and the ST-T segment was based on 250 consecutive sinus beats per individual. Signal-averaged ECGs were analyzed with the Simson method. The diagnostic utility of the five singular parameters and all combinations of variables were evaluated by linear discriminant analysis, maximizing the area under the receiver operator characteristic (ROC) curve. We conclude that the combination of de- and re-polarization variability with the static QRS duration markedly improves the detection of patients with inducible ventricular tachycardia (VT)
One hundred and thirteen attempts at directional coronary atherectomy: the early and combined experience of two European centres using quantitative angiography to assess their results. Umans V, Haine E, Renkin J, de Feyter P, Wijns W, Serruys PW. Catheterisation Laboratory, University Hospital Dijkzigt, Erasmus University Rotterdam. Directional coronary atherectomy has been introduced as an alternative to conventional balloon angioplasty when treating coronary artery stenoses with complex lesion morphology. To determine the immediate efficac...
Preoperative radiotherapy combined with resection of squamous cell carcinoma of the mid-thoracic oesophagus. Does a histopathological malignancy grading system assess actual survival? Lewinski T, Morysinski T, Pietrow D, Sikora K. Department of Surgical Oncology, Maria Sklodowska-Curie Memorial Cancer Centre and Institute of Oncology, Warsaw, Poland. The aim of our study was to assess the reproducibility of the findings of Hambraeus et al. In their group of patients with squamous cell carcinoma of the oesophagus who underwent preoperative ra...
Purification of aplastic anaemia (AA) marrow haemopoietic progenitors combined with long-term marrow cultures (LTMC) to assess haemopoiesis in AA. Marsh JC, Chang J, Testa NG, Hows JM, Dexter TM. Department of Experimental Haematology, Paterson Institute, Christie Hospital, Manchester, UK. PMID: 1715226 [PubMed - indexed for MEDLINE]
[Immunocorrection in the combined treatment of patients with osteomyelitis developing following combined injuries to the maxillofacial and craniocerebral areas] [Article in Russian] Grigoriants LA, Zuev VP, Rakhmetov BR, Eremeev VV, Abramova ZP, Litvinova LL. Twenty-one of the forty-two patients with osteomyelitis developing after a combined maxillofacial and craniocerebral injury were administered thymogen, an immunocorrective drug, as a component of combined therapy; immunologic indications for the prescription of such an agent were pr...
We derive an upper bound on the generalization error of classifiers from a certain class of threshold networks. The bound depends on the margin of the classifier and the average complexity of the hidden units (where the average is over the weights assigned to each hidden unit). By representing convex combinations of decision trees or mask perceptrons as such threshold networks we obtain similar bounds on the generalization error of these classifiers.
Enrichment of combined antral and corpus atrophic gastritis ("combined AG") in sibs of gastric carcinoma patients. Kekki M, Siurala M, Iham?ki T. Second Dept. of Medicine, University of Helsinki, Finland. The occurrence of different combinations of antral and corpus atrophic gastritis (AG) was studied in 127 sibs and 159 children of 73 gastric carcinoma patients. Seventy-three control probands, age- and sex-matched for the carcinoma probands, and their 379 first-degree relatives were used as controls. Sibs of gastric carcinoma patients revea...
We derive an upper bound on the generalization error of classifiers from a certain class of threshold networks. The bound depends on the margin of the classifier and the average complexity of the hidden units (where the average is over the weights assigned to each hidden unit). By representing convex combinations of decision trees or mask perceptrons as such threshold networks we obtain similar bounds on the generalization error of these classifiers. These bounds have immediate application to combinations of decision trees or mask perceptrons b...
We derive an upper bound on the generalization error of classifiers from a certain class of threshold networks. The bound depends on the margin of the classifier and the average complexity of the hidden units (where the average is over the weights assigned to each hidden unit). By representing convex combinations of decision trees or mask perceptrons as such threshold networks we obtain similar bounds on the generalization error of these classifiers.
Abstract This paper explores the relative performance of the combined free/demand assignment multiple access (CFDAMA) protocol with random access and with packet accompanied request strategies in supporting self-similar traffic over a geostationary satellite link. It Is shown that both request strategies have certain advantages and are suited to different levels of channel loading. A new scheme is proposed, CFDAMA with combined requests (CFDAMA-CR), which combines the two request strategies to gain the benefits of both. Simulation results show...
The appraisal of system architect is handicapped by the vague and abstract responsibilities of the system architect. The success criterions for architecting are discussed. An approach to "measure" or assess the architect is described.