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Systemic inflammation associated with mechanical ventilation among extremely preterm infants.

ABSTRACT: Little evidence is available to document that mechanical ventilation is an antecedent of systemic inflammation in preterm humans. We obtained blood on postnatal day 14 from 726 infants born before the 28th week of gestation and measured the concentrations of 25 inflammation-related proteins. We created multivariable models to assess the relationship between duration of ventilation and protein concentrations in the top quartile. Compared to newborns ventilated for fewer than 7 days (N=247), those ventilated for 14 days (N=330) were more likely to have elevated blood concentrations of pro-inflammatory cytokines (IL-1?, TNF-?), chemokines (IL-8, MCP-1), an adhesion molecule (ICAM-1), and a matrix metalloprotease (MMP-9), and less likely to have elevated blood concentrations of two chemokines (RANTES, MIP-1?), a matrix metalloproteinase (MMP-1), and a growth factor (VEGF). Newborns ventilated for 7-13 days (N=149) had systemic inflammation that approximated the pattern of newborns ventilated for 14 days. These relationships were not confounded by chorioamnionitis or antenatal corticosteroid exposure, and were not altered appreciably among infants with and without bacteremia. These findings suggest that 2 weeks of ventilation are more likely than shorter durations of ventilation to be accompanied by high blood concentrations of pro-inflammatory proteins indicative of systemic inflammation, and by low concentrations of proteins that might protect from inflammation-mediated organ injury.

SUBMITTER: Bose CL

PROVIDER: S-EPMC3518391 | biostudies-literature | 2013 Jan

REPOSITORIES: biostudies-literature

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Systemic inflammation associated with mechanical ventilation among extremely preterm infants.

Bose Carl L CL Laughon Matthew M MM Allred Elizabeth N EN O'Shea T Michael TM Van Marter Linda J LJ Ehrenkranz Richard A RA Fichorova Raina N RN Leviton Alan A

Cytokine 20121111 1

Little evidence is available to document that mechanical ventilation is an antecedent of systemic inflammation in preterm humans. We obtained blood on postnatal day 14 from 726 infants born before the 28th week of gestation and measured the concentrations of 25 inflammation-related proteins. We created multivariable models to assess the relationship between duration of ventilation and protein concentrations in the top quartile. Compared to newborns ventilated for fewer than 7 days (N=247), those ...[more]

PMID: 23148992

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Project description:BACKGROUND:The relation between mechanical ventilation (MV) and bronchopulmonary dysplasia (BPD) - a common disease in extremely premature newborn (PTNB) - is well stabilished, but is unknown, however, how much time under MV influences the severity of the disease. AIM:To define the duration under MV with greater chance to develop moderate to severe BPD in extremely PTNB and to compare clinical outcomes before and during hospitalization among patients with mild and moderate to severe BPD. METHODS:Fifty-three PTNB were separated into mild and moderate to severe BPD groups and their data were analyzed. Time under MV with a greater chance of developing moderate to severe BPD was estimated by the ROC curve. Perinatal and hospitalization outcomes were compared between groups. A logistic regression was performed to verify the influence of variables associated to moderate to severe BPD development, such as pulmonary hypertension (PH), gender, gestational age (GA) and weight at birth, as well the time under MV found with ROC curve. The result of ROC curve was validated using an independent sample (n =?16) by Chi-square test. RESULTS:Time under MV related to a greater chance of developing moderate to severe BPD was 36?days. Moderate to severe BPD group had more males (14 vs 5, p =?0,047), longer time under MV (43 vs 19?days, p <?0,001), more individuals with PH (12 vs 3, p =?0,016), worse retinopathy of prematurity (grade 3, 2 vs 11, p =?0,003), longer hospital length of stay (109 vs 81,5?days, p <?0,001), greater PMA (41 vs 38?weeks, p <?0,001) and weight (2620 vs 2031?g, p <?0,001) at discharge and the mild BPD group had more CPAP use prior to MV (12 vs 7, p =?0,043). Among all variables included in logistic regression, only PH and MV?<?36?days were significant in the model, explaining 72% of variation in moderate to severe BPD development. In the validation sample, prevalence of preterm infants who needed MV for more than 36?days in the moderate to severe BPD group was 100% (n =?6) and 0% in mild BPD group (p =?0,0001). CONCLUSION:Time under MV related to moderate to severe BPD development is 36?days, and worst outcomes are related to disease severity. PH and time under MV for more than 36?days are related to development of moderate to severe BPD.

Project description:BackgroundAmong infants born prematurely, competence at oral feeding is necessary for growth and hospital discharge. Extremely preterm (EP) infants (28 weeks of gestational age [GA]) are at risk for a variety of medical complications, which can limit the infant's capacity to develop oral feeding competence.ObjectiveThis study examined feeding progression by assessing timing of acquisition of five early feeding milestones among EP infants and the impact of immaturity and medical complications.DesignA chart review was conducted for 94 EP infants who participated in a larger longitudinal randomized study. Feeding progression was defined as infants' postmenstrual age (PMA) at five milestones: first enteral feeding, full enteral feeding, first oral feeding, half oral feeding, and full oral feeding. GA at birth and five medical complications (neurological risk, bronchopulmonary dysplasia, necrotizing enterocolitis, patent ductus arteriosus, and gastroesophageal reflux disease) were used as potential factors influencing the feeding progression. Linear mixed models were used to examine feeding progression across the milestones and contributions of GA at birth and five medical complications on the progression, after controlling for milk type as a covariate.ResultEP infants gradually achieved feeding milestones; however, the attainment of the feeding milestones slowed significantly for infants with younger GA at birth and the presence of medical complications, including neurological risk, bronchopulmonary dysplasia, necrotizing enterocolitis, and patent ductus arteriosus but not gastroesophageal reflux disease. Milk type was a significant covariate for all analyses, suggesting that infants fed with breast milk achieved each of five milestones earlier than formula-fed infants.DiscussionImproved understanding of the timing of essential feeding milestones among EP infants and the contribution of specific medical conditions to the acquisition of these milestones may allow for more targeted care to support feeding skill development.

Project description:ImportanceExtubation failure is common in extremely preterm infants. The current paucity of data on the adverse long-term respiratory outcomes associated with reinitiation of mechanical ventilation prevents assessment of the risks and benefits of a trial of extubation in this population.ObjectiveTo evaluate whether exposure to multiple courses of mechanical ventilation increases the risk of adverse respiratory outcomes before and after adjustment for the cumulative duration of mechanical ventilation.Design, setting, and participantsWe performed a retrospective cohort study of extremely low-birth-weight (ELBW; birth weight <1000 g) infants born from January 1, 2006, through December 31, 2012, who were receiving mechanical ventilation. Analysis was conducted between November 2014 and February 2015. Data were obtained from the Alere Neonatal Database.ExposuresThe primary study exposures were the cumulative duration of mechanical ventilation and the number of ventilation courses.Main outcomes and measuresThe primary outcome was bronchopulmonary dysplasia (BPD) among survivors. Secondary outcomes were death, use of supplemental oxygen at discharge, and tracheostomy.ResultsWe identified 3343 ELBW infants, of whom 2867 (85.8%) survived to discharge. Among the survivors, 1695 (59.1%) were diagnosed as having BPD, 856 (29.9%) received supplemental oxygen at discharge, and 31 (1.1%) underwent tracheostomy. Exposure to a greater number of mechanical ventilation courses was associated with a progressive increase in the risk of BPD and use of supplemental oxygen at discharge. Compared with a single ventilation course, the adjusted odds ratios for BPD ranged from 1.88 (95% CI, 1.54-2.31) among infants with 2 ventilation courses to 3.81 (95% CI, 2.88-5.04) among those with 4 or more courses. After adjustment for the cumulative duration of mechanical ventilation, the odds of BPD were only increased among infants exposed to 4 or more ventilation courses (adjusted odds ratio, 1.44; 95% CI, 1.04-2.01). The number of ventilation courses was not associated with increased risk of supplemental oxygen use at discharge after adjustment for the length of ventilation. A greater number of ventilation courses did not increase the risk of tracheostomy.Conclusions and relevanceAmong ELBW infants, a longer cumulative duration of mechanical ventilation largely accounts for the increased risk of chronic respiratory morbidity associated with reinitiation of mechanical ventilation. These results support attempts of extubation in ELBW infants receiving mechanical ventilation on low ventilator settings, even when success is not guaranteed.

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Systemic inflammation associated with mechanical ventilation among extremely preterm infants.

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Systemic inflammation associated with mechanical ventilation among extremely preterm infants.

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