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SETTING Pulmonary tuberculosis (PTB) incidence greatly varies around the world, a phenomenon usually attributed to socio-economic factors or health service availability. A recent study, however, indicated that PTB was inversely related to altitude. OBJECTIVE To evaluate factors associated with PTB notification rates in Mexico. METHODS Annual(More)
Pulmonary complications in children with leukemia often display nonspecific clinical and radiologic manifestations that lead to a delay in diagnosis. The role of fiberoptic bronchoscopy (FOB) and the proper time for its performance are controversial. The aim of our study was to evaluate the frequency and nature of specific diagnoses revealed by FOB.(More)
SETTING Socio-cultural factors have been invoked to explain the male predominance among patients with pulmonary tuberculosis, but there is no conclusive evidence of their role. OBJECTIVE To assess male predominance in a group of diabetics with pulmonary tuberculosis compared with patients with pulmonary tuberculosis alone. DESIGN Clinical records of(More)
STUDY OBJECTIVES Asthma prevalence is increasing in many countries. Some recent articles, however, claim that this tendency is ending. Our aim was to investigate asthma trends in Mexico. DESIGN Annual data on health services provided to asthmatic patients were retrospectively analyzed from 1991 to 2001. SETTING The Instituto Mexicano del Seguro Social,(More)
BACKGROUND Pulse oximetry is a simple and non-invasive procedure widely used nowadays in the clinical practice. However, it is unclear if SpO2 values are constant throughout the 24 hours of the day or have periodic fluctuations. In the present study we evaluated if progressive day-night variations of SpO, values occur in children. MATERIAL AND METHODS(More)
Chronic passage of gastric and/or alimentary material into the airways is a frequent and difficult-to-diagnose condition. Because alveolar macrophages phagocytose aspirated material, it has been suggested that their identification is a useful diagnostic method. To know the usefulness of the lipid-laden alveolar macrophages (LLAM) index as a diagnostic tool(More)
Sweat test is the standard for cystic fibrosis (CF) diagnosis. Conductivity is an alternative method not yet approved, in spite of its good correlation with chloride concentration. The aim was to assess the capacity of sweat conductivity to discriminate between CF and non-CF subjects. Automated measurements of conductivity and chloride concentration were(More)
Asthma guidelines suggest evaluation of peak expiratory flow (PEF) variability, but timing for the two PEF measurements is not mentioned. Usual formula calculates amplitude as percentage of mean day-night PEF values. Since PEF circadian changes follow a sinusoidal function, we reasoned that variability might be calculated by measuring PEF at 4 pm (PEF(1))(More)
AIM To determine the agreement rates between clinical and autopsy diagnoses in a neonatal intensive care unit (NICU), distinguishing between the main diagnosis and cause of death. METHODS Clinical and autopsy records of 75 infants who died in two consecutive years in the NICU (autopsy rate 42.6%) of a pediatric hospital in Mexico City were reviewed. (More)
BACKGROUND Passive smoking is associated with poor asthma control in children, but the mechanism is unknown. Leukotrienes are involved in the asthma pathogenesis and their synthesis is increased in adult subjects who actively smoke. OBJECTIVE To evaluate whether passive smoking, as assessed by urinary cotinine levels, increases leukotriene production in(More)