Prevalence of chronic obstructive pulmonary disease in patients diagnosed with HIV without prior antiretroviral treatment.

Introduction: Chronic obstructive pulmonary disease (COPD) is the most prevalent respiratory problem in the world. Patients with human immunodeficiency virus (HIV) infection have a higher prevalence of smoking and recurrent lung infections and are at higher risk of COPD.

Objective: To determine the prevalence of COPD in HIV-diagnosed patients referred to an infectious diseases hospital.

[A H1N1 influenza infection in pregnant patients].

Background: Despite the severity of infection with influenza virus, little has been reported about its presence in pregnant women.

Objective: To communicate our experience on influenza virus H1N1 in pregnant women.

Methods: We conducted a retrospective cohort study on 16 hospitalized patients with diagnosis of pregnancy and probable or confirmed case of infection with H1N1 influenza virus.

Development and validation of a questionnaire to identify patients with sleep apnea in Mexican population: Mexican questionnaire to identify sleep apnea.

Purpose: To develop and validate a questionnaire to identify patients with obstructive sleep apnea (OSA) in Mexican population.

Methods: We performed a cross-sectional study to develop and validate an instrument in Spanish language, consistent in an 18-item questionnaire. We enrolled patients seen from July 2008 to August 2009.