ABSTRACT
OBJECTIVE: This study aims to describe the frequency and characteristics of anticonvulsant medication treatments initiated in the neonatal period. STUDY DESIGN: We analyzed a cohort of neonates with a seizure diagnosis who were discharged from institutions in the Pediatric Health Information System between 2007 and 2016. Adjusted risk ratios and 95% confidence intervals for characteristics associated with neonatal (≤ 28 days postnatal) anticonvulsant initiation were calculated via modified Poisson regression. RESULTS: A total of 6,245 infants from 47 institutions were included. There was a decrease in both phenobarbital initiation within the neonatal period (96.9 to 91.3%, p = 0.015) and continuation at discharge (90.6 to 68.6%, p <0.001). Levetiracetam (7.9 to 39.6%, p < 0.001) initiation within the neonatal period and continuation at discharge (9.4 to 49.8%, p < 0.001) increased. Neonates born at ≥ 37 weeks' gestation and those diagnosed with intraventricular hemorrhage, ischemic/thrombotic stroke, other hemorrhagic stroke, and hypoxic ischemic encephalopathy (HIE) had a higher probability of anticonvulsant administration. The most prevalent diagnosis was HIE (n = 2,223, 44.4%). CONCLUSION: Phenobarbital remains the most widely used neonatal seizure treatment. Levetiracetam is increasingly used as a second line therapy. Increasing levetiracetam use indicates a need for additional study to determine its effectiveness in reducing seizure burden and improving long-term outcomes.
Subject(s)
Anticonvulsants/therapeutic use , Hypoxia-Ischemia, Brain/complications , Levetiracetam/therapeutic use , Phenobarbital/therapeutic use , Seizures/drug therapy , Cerebral Intraventricular Hemorrhage/complications , Databases, Factual , Female , Gestational Age , Humans , Infant, Newborn , Male , Retrospective Studies , Seizures/diagnosis , Seizures/etiology , Stroke/complications , United StatesABSTRACT
OBJECTIVE: Changes in cerebrovascular hemodynamics associated with head position may be important in the pathogenesis of periventricular-intraventricular hemorrhage (PIVH) in premature infants. This study evaluated the effect of elevated midline head positioning on cardiopulmonary function and the incidence of PIVH. STUDY DESIGN: ELBW infants were randomized to FLAT (flat, supine) or ELEV (supine, bed elevated 30 degrees) for 96 h. Cardiopulmonary function, complications of prematurity, and the occurrence of PIVH were documented. RESULTS: Infants were randomized into FLAT (n = 90) and ELEV groups (n = 90). No significant differences were seen in the incidence of BPD or other respiratory complications. The ELEV group developed significantly fewer grade 4 hemorrhages (p = 0.036) and survival to discharge was significantly higher in the ELEV group (p = 0.037). CONCLUSIONS: Managing ELBW infants in an elevated midline head position for the first 4 days of life appears safe and may decrease the likelihood of severe PIVH and improve survival.
Subject(s)
Cerebral Hemorrhage , Cerebral Ventricles , Cerebrovascular Circulation/physiology , Infant, Premature, Diseases , Moving and Lifting Patients , Patient Positioning , Cerebral Hemorrhage/diagnosis , Cerebral Hemorrhage/epidemiology , Cerebral Hemorrhage/etiology , Cerebral Hemorrhage/therapy , Cerebral Ventricles/blood supply , Cerebral Ventricles/diagnostic imaging , Female , Gestational Age , Head , Humans , Incidence , Infant, Extremely Low Birth Weight , Infant, Newborn , Infant, Premature, Diseases/diagnosis , Infant, Premature, Diseases/epidemiology , Infant, Premature, Diseases/etiology , Infant, Premature, Diseases/therapy , Intensive Care, Neonatal/methods , Male , Moving and Lifting Patients/adverse effects , Moving and Lifting Patients/methods , Patient Positioning/adverse effects , Patient Positioning/methods , Treatment Outcome , Ultrasonography/methodsABSTRACT
Models of protein folding often hypothesize that the first step is local secondary structure formation. The assumption is that unfolded polypeptide chains possess an intrinsic propensity to form these local secondary structures. On the basis of this idea, it is tempting to model the local conformational properties of unfolded proteins using well-established residue secondary structure propensities, in particular, alpha-helix forming propensities. We have used spectroscopic methods to investigate the conformational behavior of a host-guest series of peptides designed to model unfolded alpha-helices. A suitable peptide model for unfolded alpha-helices was determined from studies of the length dependence of the conformational properties of alanine-based peptides. The chosen host peptide possessed a small, detectable, alpha-helix content. Substituting various representative guest residues into the central position of the host peptide at times changed the conformational behavior dramatically, and often in ways that could not be predicted from known alpha-helix forming propensities. The data presented can be used to rationalize some of these propensities. However, it is clear that secondary structure propensities cannot be used to predict the local conformational properties of unfolded proteins.
