75 research outputs found

    Segmentation du contour de l'endocarde sur des séquences d'images d'échographie cardiaque

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    - La segmentation d'images échocardiographiques fait l'objet de nombreuses recherches. Cet article propose une méthode utilisant les Modèles Actifs de Mouvement et d'Apparence (AAMM) combinés avec une prise en compte de la sémantique de l'image. Les AAMM peuvent modéliser les différents paramètres de l'image comme la forme du ventricule gauche, sa texture interne et l'aspect temporel des images. Concernant la sémantique de l'image, nous avons inclus la texture du myocarde dans le modèle. L'écart entre la segmentation experte et la segmentation automatique a ensuite été déterminé par des mesures telles que la mesure de Vinet et la distance de Hamming et des mesures morphologiques. Nous avons donc pu vérifier que nos résultats sont proches de la segmentation experte

    Apical aneurism and myocardial bridging in a patient with hypertrophic cardiomyopathy: Association or consequence of the myocardial bridging?

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    The identification of high-risk patients with hypertrophic cardiomyopathy (HC) for primary prevention of sudden cardiac death (SCD) remains a challenging issue, since major risk factors sometimes lack specificity. We report the case of a patient with HC and association of apical aneurysm and myocardial bridging who had been initially not implanted because she had only one major risk factor. She subsequently experienced a sustained ventricular tachycardia that finally motivated the implantation. We conclude that it is never an easy decision to implant a preventive implantable cardioverter-defibrillator (ICD). Nevertheless, additional criteria for a better selection of patients who would benefit from an ICD implant are certainly useful

    Postinfarction ventricular septal rupture: Early repair through the right atrial approach

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    AbstractObjective: Early repair of posterior ventricular septal rupture associated with myocardial infarction by means of transinfarct ventriculotomy is technically challenging and can be associated with significant mortality and morbidity. An alternative route of exposing the septum is through the right atrium. This technique, which avoids direct incision of the ventricle in select patients, reduces postrepair bleeding and impairment of ventricular contractile function. Methods: The results of 12 patients operated on over a 20-year period were reviewed and analyzed. Late follow-up was obtained in all patients who survived the operation. There were 9 men and 3 women, with a mean age of 69.9 years. The mean time between acute myocardial infarction and surgery was 7.3 days (range, 2-16 days). Six patients were in New York Heart Association class IV, and 3 patients presented for surgery in cardiogenic shock. One patient had previously undergone a coronary artery bypass. The surgical technique included a standard sternotomy approach with a transatrial approach to the septal rupture. In all patients the septal rupture was repaired with a Dacron patch. Results: There were 3 early deaths and 1 late death; one patient was reoperated on for a residual shunt. Postoperative complications included low cardiac output, acute renal tubular necrosis, and supraventricular arrhythmia. Eight patients are alive and undergoing echocardiographic investigation, and only 1 patient had a small residual shunt. Conclusion: Our experience shows that a posterior ventricular septal rupture can be safely repaired through a transatrial approach. Avoiding additional damage to the ventricle, it reduces the risks of the postoperative bleeding and enhances survival. (J Thorac Cardiovasc Surg 2000;119:784-9
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