Examinando por Autor "Rincón, Melvin Y."

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  • Publicación
    Acceso abierto
    Hyperinsulinemia is a predictor of new cardiovascular events in colombian patients with a first myocardial infarction
    (2011-04-01) García, Ronald G.; Rincón, Melvin Y.; Arenas, William D.; Silva, Sandra Y.; Reyes, Laura M.; Ruiz, Silvia L.; Ramírez, Fabián; Camacho López, Paul Anthony; Luengas, Carlos; Saaibi, José F.; Balestrini, Sebastián; Morillo, Carlos; Lopez-Jaramillo, Patricio
    Background: Acute Myocardial Infarction (AMI) is one of the main causes of mortality and disability in Colombia. The factors associated to a new event in surviving subjects to a first AMI in our population have not yet been fully identified. Methods: Two hundred and ninety five surviving subjects to a first AMI (58.8±12.6 years) were included in a prospective cohort study between 2000 and 2006. Lipid profile, glycemia and plasma insulin levels were measured. Deaths of cardiovascular origin, a new AMI, unstable angina, heart failure, stroke, new myocardial revascularization or angioplasty were considered new cardiovascular events. Results: The study included 61 (20.6%) women and 234 (79.4%) men. The mean follow up time was 50± 30 months with a 38.9% incidence of new events. Fifty five patients (18.6%) were diabetic. Bi-varied analysis identified as risk factors for a new cardiovascular event the presence of: hypertension, anterior descending coronary artery stenosis, intrahospital cardiac failure, age over 55, low income, lack of education, Killip III–IV, heart rate over 76 bpm, pulse pressure over 80 mm Hg, total cholesterol over 200 mg/dl and insulin over 10 IU/ml. After logistic regression analysis, the log values of insulin remained as the only significant predictor for new cardiovascular events. Conclusions: Hyperinsulinism was the most important factor associated to the occurrence of new cardiovascular events in Colombian patients with AMI, which emphasizes the pivotal role of insulin resistance in the physiopathologic mechanisms of atherosclerosis, especially in undeveloped countries.
  • Publicación
    Restringido
    Leishmaniasis cutánea diseminada. Reporte de dos casos en Santander, Colombia
    (2009-01) Rincón, Melvin Y.; Silva, Sandra Y.; Dueñas, Ruby E.; Lopez-Jaramillo, Patricio
    Leishmaniasis is a zoonosis produced by the transmission of the protozoan leishmania caused by the bite of sand-flies from the Lutzomya specie. Several clinical manifestations present themselves, depending on the infecting strain and the host’s immune response; the most frequent variety is localised cutaneous leishmaniasis. Atypical forms sometimes develop, such as the diffuse variety, in which the number of ulcers is greate than 10, thereby affecting several body areas requiring special considerations in its diagnosis and management. This article reports two cases of patients from endemic areas of Santander suffering from diffuse cutaneous leishmaniasis produced by the L. panamensis strain. Protocols for the active search of this type of case in endemic areas throughout Colombia should be implemented.
  • Publicación
    Acceso abierto
    The role of the L-arginine-nitric oxide pathway in preeclampsia
    (2008-08-01) Lopez-Jaramillo, Patricio; Arenas, William D.; García, Ronald G.; Rincón, Melvin Y.; López Casillas, Marcos
    : Preeclampsia (PE) is a major cause of maternal and perinatal mortality, especially in developing countries. Its etiology involves multiple factors, but no specific cause has been identified. Evidence suggests that clinical manifestations are caused by endothelial dysfunction. Nitric oxide (NO), which is synthesized from L-arginine in endothelial cells by the endothelial nitric oxide synthase (eNOS), provides a tonic dilator tone and regulates the adhesion of white blood cells and platelet aggregation. Alterations in the L-arginine-NO pathway have been associated with the development of PE. Various studies, reporting decreased, elevated or unchanged levels of nitrite (NO2) and nitrate (NO3), two end products of NO metabolism, have been published. Our group contributed to those contradictory reports describing cases of PE with both elevated and decreased levels of NO2 and NO3. Apparently, diminished levels of NO could be related to deficiencies in the ingestion of dietary calcium associated to low levels of plasma ionic calcium, which is crucial to the eNOS’ activity. Also, low levels of NO could be associated with the presence of eNOS polymorphisms or the presence of increased levels of ADMA, the endogenous inhibitor of NO. High levels of NO associated to low levels of cGMP suggest a decreased bioactivity of NO, which is probably related to an increased degradation of NO caused by a high production of superoxide in states of infection and inflammation. The present article analyses and reviews the reported paradoxical roles of the L-arginine-NO pathway in PE and gives a possible explanation for these results.