RESUMO
OBJECTIVE: To determine the effect of caffeine on diaphragmatic activity, tidal volume (Vt), and end-expiratory lung volume (EELV) in preterm infants. STUDY DESIGN: Using transcutaneous electromyography of the diaphragm (dEMG), we measured diaphragmatic activity from 30 minutes before (baseline) to 3 hours after administration of an intravenous caffeine-base loading dose in 30 spontaneously breathing preterm infants (mean gestational age, 29.1 ± 1.3 weeks), most of whom were on noninvasive respiratory support. Diaphragmatic activity was expressed as the percentage change in dEMG amplitude, area under the curve, respiratory rate, and inspiratory and expiratory times. Using respiratory inductive plethysmography, we measured changes in Vt and EELV from baseline. These outcome variables were calculated at 8 fixed time points after caffeine administration (5, 15, 30, 60, 90, 120, 150, and 180 minutes) and compared with baseline. RESULTS: Caffeine administration resulted in rapid (within 5 minutes) increases in dEMG amplitude (median, 43%; IQR, 24%-63%; P < .001) and area under the curve (median, 28%; IQR, 14%-48%; P < .001). Vt also increased by a median of 30% (IQR, 7%-48%), and this change was significantly correlated with the change in dEMG amplitude (r = 0.67; P < .001). These effects were relatively stable until 120 minutes after caffeine administration. Caffeine did not consistently impact EELV, respiratory rate, or inspiratory and expiratory times. CONCLUSION: Caffeine treatment results in a rapid and sustained increase in diaphragmatic activity and Vt in preterm infants.
Assuntos
Cafeína/farmacologia , Estimulantes do Sistema Nervoso Central/farmacologia , Diafragma/efeitos dos fármacos , Volume de Ventilação Pulmonar/efeitos dos fármacos , Eletromiografia , Humanos , Recém-Nascido , Recém-Nascido Prematuro , Pletismografia , Estudos ProspectivosRESUMO
OBJECTIVE: To describe employment achievement and social independence of adults with childhood end-stage renal disease (ESRD) and to explore determining factors. STUDY DESIGN: Employment, occupational level, living arrangements, social engagements, and subjective health perception were cross-sectionally established between 1998 and 2000 in 144 of all living 187 adult Dutch patients with ESRD with an onset at age 0 to 15 years between 1972 and 1992. Potential clinical determinants were established by means of a review of all medical charts. RESULTS: Compared with age-matched Dutch citizens, patients were more often involuntarily unemployed (19.4% vs 11.1%), had a lower occupational level, more often still lived with their parents, and more often had no partner. A low occupational level was associated with a dialysis duration >8 years (OR, 9.6; 95% CI, 1.9-47.6); living at the parental home was associated with the male sex (OR, 3.4; 95% CI, 1.5-7.8) and with a dialysis duration >8 years (OR, 3.7; 95% CI, 1.3-10.2). CONCLUSION: Prolonged dialysis during childhood may decrease the ability to gain high-skilled professions and social independence. Unemployment is twice as high in adult patients with childhood ESRD than in healthy persons, but more than twice as low as compared with young ESRD patients with an adult onset of the disease, according to previous reports.