Learning Objectives

1. Define the phrases "appropriate for gestational age" and "small for gestational age" (SGA). Describe the most common fetal, maternal, and placental causes of SGA infants. Contrast symmetric and asymmetric growth retardation.

2. What is the Apgar score used to measure? What is the significance of a five minute score less than 5.

3. Describe the pathogenesis of intrauterine infection and expected placental histopathologic changes of acute bacterial infection.

4. Compare and contrast the sequelae of congenital infections caused by bacteria, viruses, protozoa, and spirochetes. List the organisms that cause the TORCH infections.

5. Describe the pathogenesis of hyaline membrane disease and the histologic appearance of the lungs in this disorder.

6. Long-term ventilatory therapy of the neonate has sequelae related to the lungs and eyes. Describe the pathogenesis of the lung and eye lesions and the pathology of the lung disease.

7. Describe the pathogenesis and pathologic changes of germinal matrix and intraventricular hemorrhage.

Resources

1. (Robbins 5th Ed. p. 432-436, 442-446, 1077-1078) or (Robbins 6th Ed. p. 460-464, 470-473, 1082, 1302)

2. Images 1-8 relate to this case, Images 9-12 show related topics

Scenario

Normal Reference Range Table

Baby Girl K. was delivered at 28 weeks gestation (calculated by mother's last menstrual period) to a 25-year-old woman with a history of pregnancy-induced hypertension and continued heavy tobacco use. The mother came to the clinic complaining of cramping and rupture of placental membranes for 24 hours. She had a fever of 39°C. The fetal heartbeat was irregular, indicative of fetal distress. Due to concerns about fetal well-being, the delivery was induced. The infant was delivered 4 hours later and weighed 600 grams; the Apgar scores were 4 at 1 minute and 7 at 5 minutes. The infant appeared long and thin, with a relatively enlarged head size. By measurements, the body weight and crown-heel length were consistent with 25 weeks gestational age, and the head circumference was consistent with 28 weeks gestation. The gestation was estimated by clinical maturity studies to be 28 weeks. Sternal retractions were noted, indicating respiratory difficulties, and artificial surfactant was given. The respiratory status did not improve, and the infant was placed on a ventilator. Blood cultures were drawn, and the infant was begun on antibiotics. Over the course of the next day, increasing ventilatory support was required. The chest radiograph is available for viewing (Image #1). Blood cultures returned positive for group B streptococcus. On the second day of life, seizures developed. A head ultrasound diagnosed a severe intraventricular hemorrhage. After a discussion with the parents it was decided that heroic measures would not be instituted, and the infant expired at 32 hours of age. An autopsy was done. Gross and microscopic photographs are represented in the images for Case 1.

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ISBN: 0-7216-8462-9