Chapter·PhysiologyTemperature regulation

Temperature regulation in neonatesDownloads

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1

A 5-day-old male newborn is brought to the emergency department 1 hour after having a seizure. It lasted approximately 1 minute, and involved blinking and lip-smacking movements as well as left-sided jerking of the hand and foot. His mother says she measured a temperature of 38.2°C (100.7°F) at that time. He has had increasing difficulty feeding since yesterday. He was born at 39 weeks' gestation and weighed 3189 g (7 lb, 1 oz); he currently weighs 2980 g (6 lb, 9 oz). The mother's prenatal course was significant for gonorrhea infection diagnosed early in pregnancy and treated with ceftriaxone and azithromycin combination therapy. The boy appears irritable and lethargic. His temperature is 36.0°C (96.8°F). Examination shows clusters of vesicular lesions with an erythematous base on the patient's face and trunk. There is profuse lacrimation. Laboratory studies show: Leukocyte count 16,200/mm3 Segmented neutrophils 25% Bands 5% Lymphocytes 65% Monocytes 3% Eosinophils 2% Serum Glucose 80 mg/dL A lumbar puncture is performed. Cerebrospinal fluid analysis shows a leukocyte count of 117/μL, a protein concentration of 52 mg/dL, and a glucose concentration of 58 mg/dL. Results of blood cultures are pending. Which of the following is the most appropriate pharmacotherapy?

AIV acyclovir

BIV ceftriaxone

CPyrimethamine

DIV ganciclovir

EIV vancomycin

2

A 10-day-old male infant is brought to the emergency room for abdominal distension for the past day. His mother reports that he has been refusing feeds for about 1 day and appears more lethargic than usual. While changing his diaper today, she noticed that the baby felt warm. He has about 1-2 wet diapers a day and has 1-2 seedy stools a day. The mother reports an uncomplicated vaginal delivery. His past medical history is significant for moderate respiratory distress following birth that has since resolved. His temperature is 101°F (38.3°C), blood pressure is 98/69 mmHg, pulse is 174/min, respirations are 47/min, and oxygen saturation is 99% on room air. A physical examination demonstrates a baby in moderate distress with abdominal distension. What is the best initial step in the management of this patient?

ARadionuclide scan

BVoiding cystourethrogram

CRenal ultrasound

DUrinary catheterization

EStart IV fluids and antibiotics

3

A 27-year-old woman gives birth to a boy at 36 weeks gestational age. The infant weighs 4022 grams at birth, is noted to have a malformed sacrum, and appears to be in respiratory distress. Apgar scores are 5 and 7 at 1 minute and 5 minutes respectively. Hours after birth, the infant is found to be irritable, bradycardic, cyanotic, and hypotonic, and the infant's serum is sent to the laboratory for evaluation. Which of the following abnormalities would you expect to observe in this infant?

AHypoinsulinemia

BHypoglycemia

CHyperglycemia

DHypermagnesemia

EHypercalcemia

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