Abstract

In lieu of an abstract, here is a brief excerpt of the content:“Just Because You Can—Doesn’t Mean You Should”Mindy B. StatterAs Albert R. Jonsen stated, “The technological imperative begins to rule clinical decisions: if a technology exists, it must be applied. Patients... are moved to higher and higher levels of care, finally becoming enmeshed in a tangle of tubes that extinguish their identity and needs as persons.” In this case the conflict created by the parental demand for the utilization of technology, extracorporeal support in a neonate will be explored.I was consulted in the care of a newborn with a right–sided congenital diaphragmatic hernia (CDH). In this anomaly the diaphragm, the muscular partition that separates the abdomen and the thorax, forms incompletely, and the viscera migrate up into the chest compressing the developing lung, shifting the medistinum and heart and compressing the contralateral lung. The resulting lung maldevelopment is termed pulmonary hypoplasia. The maldevelopment of the lungs in CDH is variable with the most severe forms resulting in neonatal death. This congenital anomaly is associated with 55% survivability; the poor prognosis is due to the pulmonary hypoplasia. In addition to pulmonary hypoplasia, there is the association of pulmonary hypertension with CDH. Pulmonary hypertension is a condition where the vascular resistance in the lung is high with reduced blood flow within the lung. The physiologic consequence of pulmonary hypertension is hypoxemia, oxygen deficiency in the blood, and reduced oxygen delivery to all organs. Unlike severe pulmonary hypoplasia, pulmonary hypertension is reversible. When an infant with CDH is born and deteriorates due to respiratory failure it can be difficult to determine whether the respiratory failiure is due to pulmonary hypoplasia or pulmonary hypertension. Extracorporeal membrane oxygenation (ECMO) is indicated in the management of reversible respiratory and, or cardiac failure. In the case of neonates with CDH, ECMO addressess the reversible component of the respiratory failure, the pulmonary hypertension. The respiratory failure due to severe pulmonary hypoplasia is not reversible; ECMO is not indicated. There are established criteria to guide the determination of which infant is a candidate for ECMO. Depending upon the ECMO center, the stringency can vary.In this case, the baby had significant respiratory failure with impairment in both oxygenation, hypoxia, and ventilation–the elimination of carbon dioxide, hypercapnea. The neonatologist spoke with the mother who stated that she wanted “everything done” including ECMO in the management [End Page 22] of her baby. When the neonatologist consulted me to put the baby on ECMO I expressed my concern that this infant had irreversible respiratory failure due to pulmonary hypoplasia. And simply from a technical aspect, I could not guarantee that ECMO would “work”. When an infant is “cannulated” for extracorporeal support, cannulas are inserted to allow for the drainage of blood into the ECMO circuit, the blood oxygenated and the carbon dioxide is cleared, and the blood is then returned to the infant. The majority of diaphragmatic hernias are on the left and when the CDH is on the right side, the right heart may be compressed by the viscera in the chest, and venous drainage into the ECMO circuit may be impaired. When this is encountered, the next step in the management algorithm is to fix the hernia–reduce and return the viscera within the chest to the abdomen and eliminate the visceral compression of the right heart. The neonatologist shared my concern and also reiterated that this baby’s mother wanted “everything done”. I had little uncertainty as to the etiology of the respiratory failure in this baby. In meeting the mother’s demands I then suggested that the hernia be repaired first, and if there was improvement in the hypoxia and hypercapnea, then give the baby the benefit of the doubt that there is a component of reversibility to the respiratory failure and then proceed with ECMO cannulation. The neonatologist agreed with this suggested plan.I then went to talk with the baby’s mother. I explained my concerns that based on the profound hypercapnea on the arterial blood gases that the baby’s respiratory failure was due to pulmonary hypoplasia and not reversible with extracorporeal support. She insisted that her baby be put on ECMO. I then explained the operative algorithm and...