Anticoagulación en pacientes menores de 75 años con fibrilación auricular / Anticoagulation in patients aged less than 75 years with atrial fibrillation

Para estudiar la efectividad y seguridad de la anticoagulación en la fibrilación auricular no valvular crónica en pacientes menores de 75 años de la práctica clínica diaria incluimos en un estudio prospectivo 345 pacientes consecutivos atendidos entre el 1 de febrero de 2000 y el 1 de febrero de 2002 en dos consultas de cardiología. Se les indicó tratamiento anticoagulante de acuerdo con las recomendaciones de las sociedades científicas y fueron seguidos para evaluar eventos mayores (muerte, ictus, accidente isquémico transitorio, embolismos periféricos o hemorragia grave) por grupo de tratamiento. Los pacientes con terapia anticoagulante (n = 262,76%) presentaron una mayor frecuencia de hipertensión y embolismo previo y un mayor número de factores de riesgo cardioembólicos (p < 0.001); el 92% de los pacientes tratados sin anticoagulantes recibieron antiagregantes. Tras 23 ± 13 meses de seguimiento, la tasa (por 100 pacientes-año) de eventos embólicos (0.82 versus3.42, p = 0.022) fue menor en los pacientes que recibieron anticoagulantes, sin diferencias significativas en las tasas de sangrado grave (0.61 frente a 1.37, p = 0.39), ni en la mortalidad total (1.23 frente a 1.37, p = 0.96). La anticoagulación oral en la fibrilación auricular no valvular de aucerdo con las recomendaciones de las sociedades científicas es efectiva y segura en pacientes menores de 75 años en la práctica clínica diaria.

Our objective was to study the effectiveness and safety of oral anticoagulation for permanent non-valvular atrial fibrillation in patients younger than 75 years seen in dailyclinical practice. In a prospective study, we included 345 consecutive patients seen since February, 1st 2000 toFebruary 1st 2002 in two outpatient cardiology clinics. Anticoagulant treatment was indicated following scientific societies recommendations; and patients were divided intreatment groups and followed for major events (death,stroke, transient ischemic attack, peripheral embolism orsevere haemorrhage). Anticoagulated patients (n = 262,76%) presented hypertension and previous embolism more frequently; as well as a greater number of cardioembolicrisk factors (p < 0.001). Ninety-two percent ofnon-anticoagulated patients received platelet aggregation inhibitors. After 23 ± 13 months of follow-up, the rateof embolic events (per 100 patients-year) was lower inanticoagulated patients (0.82 versus 3.42, p = 0.022). Rates of severe bleeding (0.61 versus 1.37, p = 0.39) andall-cause mortality (1.23 versus 1.37, p = 0.96) showed no significant differences. Oral anticoagulation in nonvalvularatrial fibrillation following the recommendationsof scientific societies is effective and safe in patients younger than 75 years in daily clinical practice.

The inhibitory effect of biofilms produced by wild bacterial isolates to the larval settlement of the fouling ascidia Ciona intestinalis and Pyura praeputialis

Marine biofouling is a present and potentially increasing future problem at molluscan culture centres. The problem is highly variable, exists on different scales, and its negative impact on cultured organisms and related economic losses at these centres has not been significantly controlled. One approach to fouling control has been the incorporation of natural substances into anti-fouling paints which inhibit the settlement of common fouling organisms. The main objective of the present study was the isolation of naturally occurring substances from marine bacteria which were inhibitory to the settlement of Ciona intestinalis and Pyura praeputialis, two tunicate species causing serious fouling problems in scallop culture systems in Chile. Numerous bacterial strains were isolated from microfouling on natural and artificial substrates submerged in the sea; of 73 strains isolated, 20 percent demonstrated inhibitory effects on the settlement of the larvae of the above cited tunicates. The inhibitory substances produced by the active bacteria were extracellular, and could be incorporated in an inert matrix (PhytagelTM) without losing their inhibitory properties. Some properties of the inhibitory substance isolated from bacterial strain Clon Nil-LEM (Alteromonas sp) included thermostability, MW < 3500 Da, peptidase lability (against C. intestinalis), and undiminished inhibitory activity when incorporated in the inert matrix.