Applied Evidence

A guide to providing wide-ranging care to newborns

J Fam Pract. 2018 April;67(4):E4-E15

From The Journal of Family Practice | 2018;67(4):E4-E15.

References

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Fever—a full work-up, thorough history are key

Concern about serious bacterial illness (SBI) makes the evaluation of fever critical for those who care for newborns. Many studies have attempted to identify which newborns might be able to be cared for safely as outpatients to prevent unnecessary testing and antibiotics.^5,42Regrettably, SBI in infants remains difficult to predict, and protocols that have been developed may miss as many as 1 of every 10 newborns who has SBI.⁴³ Initial management of all infants 28 days old or younger with fever must therefore include a full work-up, including lumbar puncture and empiric antibiotics.⁴⁴

Evaluation. When an infant younger than 28 days has a fever, the physician should first verify that the temperature was taken rectally and how it was documented. In an infant who has a history of prematurity, it is crucial to correct for chronological age when deciding on proper evaluation.

Additional important findings in the history include a significant change in behavior, associated symptoms, and exposure to sick contacts. The maternal and birth history, including prolonged rupture of membranes, colonization with group B Streptococcus, administration of antibiotics at delivery, and genital herpes simplex virus (HSV) infection may suggest a cause for fever.⁴⁵

The evaluation of fever might include the white blood cell (WBC) count, blood culture, measurement of markers of inflammation, urine studies, lumbar puncture, stool culture, and chest radiograph. Traditionally, the WBC count has been utilized as a standard marker for sepsis, although it has a low sensitivity and specificity for SBI, especially in newborns.⁴⁶ Blood cultures should be obtained routinely in the newborn with fever, and before antibiotics are administered in older infants.

Procalcitonin (PCT; a calcitonin precursor) and the inflammatory marker C-reactive protein (CRP) have been shown, in several large studies, to have relatively high sensitivity and specificity for SBI; measurement of these constituents may enhance detection of serious illness.^46-49 In a large study of 2047 febrile infants older than 30 months, the PCT level was determined to be more accurate than the CRP level, the WBC count, and the absolute neutrophil count in predicting SBI.^48,49 PCT shows the most promise for preventing a full fever work-up and empiric antibiotics. It has not yet been widely translated into practice, however, because of a lack of clear guidance on how to combine PCT levels with other laboratory markers and clinical decision-making.^48-50

Urinalysis (UA) should be obtained for all newborns who present with fever. Traditionally, it was recommended that urine should be cultured for all newborns with fever; however, more recent data show that the initial urinalysis is much more sensitive than once thought. In a study, UA was positive (defined as pyuria or a positive leukocyte esterase test, or both) in all but 1 of 203 infants who had bacteremic UTI (sensitivity, 99.5%).⁵¹

The procalcitonin level was determined to be more accurate than the C-reactive protein level, the white blood cell count, and the absolute neutrophil count in predicting serious bacterial illness.

Stool culture is necessary in newborns only when they present with blood or mucus in diarrhea. Lumbar puncture should be performed in all febrile newborns and all newborns for whom empiric antibiotics have been prescribed.^43,44 A chest radiograph may be useful in diagnosis when a newborn has any other sign of pulmonary disease: respiratory rate >50/min, retractions, wheezing, grunting, stridor, nasal flaring, cough, and positive findings on lung examination.^43,44

Treatment. Management for all newborns who have a rectal temperature ≥38° C includes admission to the hospital and empiric antibiotics; guidance is based primarily on expert consensus. Common pathogens for SBI include group B Strep, Escherichia coli, Enterococcus spp., and Listeria monocytogenes.^43,44 Empiric antibiotics, including ampicillin (to cover L monocytogenes) and cefotaxime or gentamicin should be started immediately after sending for blood, urine, and cerebrospinal fluid (CSF) cultures.^43-45

Management for all newborns who have rectal temperature ≥38° C includes admission to the hospital and empiric antibiotics.

All infants who are ill-appearing or have vesicles, seizures, or a maternal history of genital HSV infection should also be started on empiric acyclovir. Vesicles should be cultured and CSF should be sent for HSV DNA polymerase chain reaction before acyclovir is administered.^43-45

Sudden infant death syndrome: Steps to take to minimize risk

SIDS is defined as the sudden death of a child younger than 1 year that remains unexplained after a thorough case investigation and comprehensive review of the clinical history. The risk of SIDS in the United States is less than 1 for every 1000 live births; incidence peaks between 2 and 4 months of age.⁵² In the United States, SIDS and other sleep-related infant deaths, such as strangulation in bed or accidental suffocation, account for more than 4000 deaths a year.⁵³ The incidence of SIDS declined markedly after the “Back to Sleep” campaign was launched in 2003, but has leveled off since 2005.^53-55