Browsing by Author "Quintana, JC"

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    Effects of Carvedilol upon intra- and interventricular synchrony in patients with chronic heart failure
    (EXCERPTA MEDICA INC-ELSEVIER SCIENCE INC, 2005) Castro, PF; Mc Nab, P; Quintana, JC; Bittner, A; Greig, D; Vergara, I; Vukasovic, JL; Corbalan, R; Copaja, M; Diaz Araya, G; Chiong, M; Troncoso, R; Alcaino, H; Lavandero, S
    Radionuclide isotopic ventriculography with phase analysis was performed in 30 patients with stable heart failure (HF), determining left ventricular (LV) and interventricular contraction synchrony at baseline and after 6 months of treatment with maximal tolerated doses of carvedilol. Patients with HF had significant ventricular dyssynchrony compared with a normal population. The 50th percentile of patients with the greatest dyssynchrony at baseline showed significant improvement in ventricular synchrony after receiving carvedilol, and this was correlated positively with a reduction in end-diastolic LV volumes. (c) 2005 Elsevier Inc. All rights reserved.
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    Reversible myocardial ischemia associated to hypothyroidism. Report of one case
    (2001) Quevedo, I; Mosso, L; Dominguez, JM; Fajuri, A; Quintana, JC; NCD Risk Factor Collaboration (NCD-RisC)
    A silent, reversible myocardial ischemia with normal coronary angiography and reversible with thyroid hormone substitution, has been recently described in hypothyroid patients. We report a 49 years old male with an abnormal exercise electrocardiogram detected in a preventive medical examination. He had laboratory evidence of hypothyroidism and a history of two years of asthenia and progressive coarsening of the voice. The Thallium myocardial perfusion study, showed an alteration of coronary flow during exercise in the septum and lower wall of the left ventricle. Thyroid hormone substitution was started and three months later, a coronary angiography was normal. After six months a repeated Thallium perfusion study and exercise electrocardiogram were informed as normal (Rev Med Chile 2001; 129: 1320-4).
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    Treatment of acute infantile diarrhoea with a commercial rice-based oral rehydration solution
    (ICDDR B, 1995) Guiraldes, E; Trivino, X; Hodgson, MI; Quintana, JC; Quintana, C
    This randomized clinical trial compared the efficacy of an oral rehydration solution (ORS) formulated with commercial rice powder, 50 g/l, with that of a glucose-based WHO/UNICEF-recommended ORS in the management of 48 inpatients aged 3-24 months, with acute dehydrating watery diarrhoea, Stool outputs were generally high in these patients, and 11 patients (22%) required additional intravenous rehydration solutions, The stool output (ml/kg) in the first 24 hours was [geometric mean, (95% confidence intervals)] 213 (153-353) in the rice-ORS group versus 146 (108-232) in the glucose-ORS group, while the total stool output was 455 (298-933) versus 307 (209-625); (p value not significant), The mean (+/-SD) duration of diarrhoea in hospital was: 72+/-10 hours in the study group versus 77+/-12 hours in the control group (p value NS), Enteropathogens were found in 94% of the patients, rotavirus being prevalent in 85% of the cases. It is concluded that the rice-ORS used in this trial is no more efficacious than the standard glucose-ORS advocated by WHO/UNICEF in the treatment of infants with watery non-cholera dehydrating diarrhoea, In some cases, ORS formulated with the commercial cereal-based products might actually increase the stool losses in infants with high-output non-cholera diarrhoea.