Browsing by Author "MATURANA, G"

Now showing 1 - 5 of 5
  • No Thumbnail Available
    Item
    CARDIOVASCULAR MANAGEMENT OF PREGNANT-WOMEN WITH A HEART VALVE PROSTHESIS
    (1975) CASANEGRA, P; AVILES, G; MATURANA, G; DUBERNET, J
  • No Thumbnail Available
    Item
    DISK DISLODGMENT IN BJORK SHILEY MITRAL-VALVE PROSTHESIS - 2 SUCCESSFULLY OPERATED CASES
    (1986) DUBERNET, J; IRARRAZAVAL, MJ; URZUA, J; MATURANA, G; MORAN, S; LEMA, G; ASENJO, F; FAJURI, A
  • No Thumbnail Available
    Item
    ELECTIVE CORRECTION OF INTRA-CARDIAC LESIONS RESULTING FROM PENETRATING WOUNDS OF THE HEART
    (1979) MORGAN, S; MATURANA, G; URZUA, J; FRANCK, R; DUBERNET, J
    Controversy exists regarding the timing and technique of total correction of traumatic intracardiac lesions. Patients (5) with penetrating wounds of the heart received emergency treatment aimed at securing normal hemodynamics. No attempt was made to identify intracardiac lesions at this stage. Cineangiography 2 mo.-7 yr later showed aorto-right ventricular fistulae in all patients, associated in 2 with aortic cusp laceration and in 1 with an aorto-left atrial fistula. The surgical approach for aorto-right ventricular fistula was through the right ventricle or aorta. Valvar injuries were treated by plastic reconstruction. All patients showed good clinical results when seen 4-11 yr later. Traumatic intracardiac lesions in patients with stable hemodynamics after initial treatment should be operated on electively. The aortic approach is preferable for aorto-right ventricular fistulae. Conservative plastic repair of valvar injuries achieves long-term competence thus avoiding prosthetic replacement.
  • No Thumbnail Available
    Item
    SURGICAL REMOVAL OF ENTRAPPED ENDOCARDIAL LEADS WITHOUT USING EXTRACORPOREAL-CIRCULATION
    (1985) DUBERNET, J; IRARRAZAVAL, MJ; LEMA, G; MATURANA, G; URZUA, J; MORAN, S; NAVARRO, M; FAJURI, A
  • No Thumbnail Available
    Item
    ULTRASTRUCTURAL MYOCARDIAL PRESERVATION DURING CORONARY-ARTERY SURGERY - A CONTROLLED, PROSPECTIVE, RANDOMIZED STUDY IN HUMANS
    (1986) MORAN, SV; CHUAQUI, B; IRARRAZAVAL, MJ; THOMSEN, P; NAVARRO, M; URZUA, J; MATURANA, G
    Potassium cardioplegia was compared with normothermic, intermittent ischemic arrest in 30 patients undergoing multiple coronary artery bypass grafts. Group 1 comprised 15 patients in whom cold potassium cardioplegia with St. Thomas'' Hospital solution was used. In Group 2 were 15 patients who underwent intermittent ischemic arrest during the construction of the distal anastomoses. Two myocardial transmural left ventricular biopsies were done in each patient. There was no operative mortality. Electron microscopical examination showed normal myocardial ultrastructure in both groups. In particular, mitochondria were well preserved in all samples. The postoperative electrocardiogram demonstrated a new Q wave in 1 patient in Group 2 whose level of the myocardial isoenzyme of creatine phosphokinase (CPK-MB) was within the normal range. The peak CPK-MB release in Group 1 was 23.2 .+-. 20.1 IU and in Group 2, 19.9 .+-. 15.1 IU. This difference was not statistically significant. The mean period of anoxic arrest in Group 1 was 49.5 .+-. 15 minutes and in Group 2, 25.5 .+-. 8 minutes (p < 0.001). Total cardiopulmonary bypass time in Group 1 was 114.5 .+-. 20 minutes and in Group 2, 90.2 .+-. 16 minutes (p < 0.01). It is concluded that both techniques can preserve myocardial subcellular architecture during multiple coronary artery bypass grafting in patients with normal left ventricular function.