RESUMEN
Angiotensin II Receptor blockers (ARBs) are an important addition to the current range of medications available for treating a wide spectrum of diseases including cardiovascular diseases. Coronary heart disease (CHD) is the most common cause of death in the United Kingdom and worldwide. More importantly, the presence of the metabolic syndrome and the likelihood of diabetes mellitus taking on epidemic proportions in the years to come all threaten to maintain the mortality rate due to CHD. This review article focuses on the clinical studies that have helped define the trends in the usage of these agents in the prevention and treatment of diabetes mellitus and its complications and also explores possible mechanisms of action and future developments.
Asunto(s)
Bloqueadores del Receptor Tipo 1 de Angiotensina II/uso terapéutico , Antihipertensivos/uso terapéutico , Enfermedad Coronaria/tratamiento farmacológico , Diabetes Mellitus Tipo 2/prevención & control , Angiopatías Diabéticas/tratamiento farmacológico , Retinopatía Diabética/tratamiento farmacológico , Adolescente , Adulto , Anciano , Anciano de 80 o más Años , Bloqueadores del Receptor Tipo 1 de Angiotensina II/efectos adversos , Bloqueadores del Receptor Tipo 1 de Angiotensina II/farmacología , Antihipertensivos/farmacología , Diabetes Mellitus Tipo 2/complicaciones , Endotelio Vascular/metabolismo , Femenino , Humanos , Masculino , Persona de Mediana Edad , Sistema Renina-Angiotensina/efectos de los fármacosRESUMEN
This study characterised non-multiresistant methicillin-resistant Staphylococcus aureus (nmMRSA) isolates from Kuwait hospitals to ascertain whether they were community-acquired MRSA (CA-MRSA). Forty-two nmMRSA isolates obtained between July 2001 and October 2003 were analysed by staphylococcal cassette chromosome mec (SCCmec) typing, bacteriophage typing, production of Panton-Valentine leukocidin (PVL), urease and staphylococcal enterotoxins A, B, C and D, TSST-1, and by pulsed-field gel electrophoresis (PFGE). Forty-one isolates were SCCmec type IV, and one isolate was SCCmec type III. The isolates belonged to six PFGE patterns, with two types, A and D, distributed in six and four hospitals, respectively. Most (n = 26; 61.9%) isolates produced urease. These isolates were mainly from wound and skin infections, showed low-level methicillin resistance (MIC 8-48 mg/L), and nine carried genes for PVL. These characteristics, together with their carriage of the type-IV SCCmec, identified the isolates as CA-MRSA. Ten of the 16 urease-negative isolates produced staphylococal enterotoxin C; 12 reacted weakly with phage 75, and were resistant to clindamycin and/or erythromycin, which are characteristics of EMRSA-15. Thus, this study identified the co-existence of two types of nmMRSA, i.e., CA-MRSA and EMRSA-15, in Kuwait hospitals.
Asunto(s)
Resistencia a la Meticilina , Staphylococcus aureus/clasificación , Antibacterianos/farmacología , Proteínas Bacterianas/genética , Toxinas Bacterianas/genética , Técnicas de Tipificación Bacteriana , Infección Hospitalaria , ADN Bacteriano/análisis , Electroforesis en Gel de Campo Pulsado , Enterotoxinas/metabolismo , Exotoxinas/genética , Genes Bacterianos , Hospitales , Humanos , Kuwait , Leucocidinas , Meticilina/farmacología , Pruebas de Sensibilidad Microbiana , Recombinasas/genética , Infecciones Estafilocócicas/microbiología , Staphylococcus aureus/efectos de los fármacos , Staphylococcus aureus/genética , Staphylococcus aureus/metabolismo , Ureasa/metabolismo , beta-Lactamas/farmacologíaRESUMEN
OBJECTIVES: To investigate the genetic location of the mupA gene in high-level mupirocin-resistant Staphylococcus aureus isolates. MATERIALS AND METHODS: Antibiotic resistance was detected by disc diffusion. The Etest was used to determine mupirocin MIC. The presence of mupA was detected by PCR using specific primers. Curing, transfer experiments, pulsed-field gel electrophoresis (PFGE) and DNA hybridization were used to study the genetic location of mupA. RESULTS: The isolates had mupirocin MICs > 1024 mg/L and were resistant to methicillin, gentamicin, kanamycin, streptomycin, erythromycin, tetracycline, ciprofloxacin, cadmium acetate, propamidine isethionate and ethidium bromide. They carried two plasmids of approximately 26 and 2.8 kb. Curing and transfer experiments demonstrated that the 26 kb plasmid encoded resistance to cadmium acetate, propamidine isethionate and ethidium bromide. Loss of mupirocin resistance corresponded to the loss of a 40 kb DNA fragment from a 175 kb SmaI chromosomal fragment. The mupA gene was detected only in the genomic DNA of the mupirocin-resistant strains and in their derivatives cured of the 26 kb plasmid. A labelled mupA probe hybridized to the 175 kb SmaI fragment only in the mupirocin-resistant isolates. CONCLUSION: The absence of mupA on any of the plasmids and its detection only in the chromosomal DNA of the parents and in their derivatives cured of the 26 kb plasmid strongly supports a chromosomal location for mupA in these isolates.
Asunto(s)
Antibacterianos/farmacología , Cromosomas Bacterianos/efectos de los fármacos , Cromosomas Bacterianos/genética , Genes Bacterianos/genética , Mupirocina/farmacología , Staphylococcus aureus/efectos de los fármacos , Staphylococcus aureus/genética , Proteínas Bacterianas/genética , Southern Blotting , Farmacorresistencia Bacteriana , Electroforesis en Gel de Campo Pulsado , Pruebas de Sensibilidad Microbiana , Proteínas Nucleares/genética , Reacción en Cadena de la Polimerasa de Transcriptasa Inversa , TemperaturaRESUMEN
The presence of adenohypophysial tissue in the nasopharynx is no longer disputed. This study was performed in 50 neonatal cadavers subjected to medical autopsy within 6 hours of death. The aim was to study the incidence of extrasellar pituitary tissue in the nasopharynx and its various histologic cell types. The transpalatal approach was used to obtain the specimens. The specimens were stained with hematoxylin and eosin and periodic acid-Schiff-orange G for selective demonstration of adenohypophysial cells. Histopathologic evaluation led to the detection of pituitary tissue in 16% of the examined specimens. Selective staining demonstrated a 6% positive incidence of adenohypophysial cells. The pharyngeal hypophysis exists in 2 forms: a typical adenohypophysial collection of cells and an atypical subepithelial cluster. The incidence of hypophysial tissue was higher in the older neonates, perhaps because of hormonal stimulation of the caudal remnant of Rathke's pouch.