A nurse is assessing a 3-day-old newborn whose mother has a history of opioid use during pregnancy. Which assessment finding would be most indicative of neonatal abstinence syndrome (NAS)?

High-pitched crying and tremors are classic neurological signs of neonatal abstinence syndrome (NAS). Other options like bradycardia, increased appetite, or jaundice are not typical for NAS.

Understanding Neonatal Abstinence Syndrome (NAS)
Neonatal abstinence syndrome (NAS) is a withdrawal syndrome that occurs in newborns after in utero exposure to certain substances, most commonly opioids ^[1]. When a pregnant individual uses opioids, these substances cross the placental barrier. After birth, when the continuous supply of the drug is abruptly discontinued, the newborn's central nervous system (CNS) becomes overstimulated, leading to a characteristic cluster of withdrawal signs [1,4]. The incidence is significant, affecting between 6.0 and 20 newborns per 1000 live US births ^[1].

Analysis of Assessment Findings
The clinical presentation of NAS is dominated by neurologic hyperirritability, autonomic dysregulation, and gastrointestinal dysfunction. The correct answer reflects the hallmark neurologic signs.

* Correct Answer Justification: High-pitched crying and tremors are classic and most indicative signs of CNS hyperirritability in NAS . The newborn's neurological system, no longer depressed by maternal opioids, enters a hyper-excitable state. Tremors can be spontaneous or provoked by stimuli, and the cry is characteristically shrill, inconsolable, and distinct from a normal hunger or discomfort cry. These findings are central to the clinical assessment of withdrawal severity .
* Incorrect Answer 1 (Bradycardia and hypothermia): This option describes a state of physiologic depression. NAS is fundamentally a state of withdrawal-induced hyper-excitability. Therefore, assessment findings would more likely include tachycardia and hyperthermia or temperature instability, not bradycardia and hypothermia .
* Incorrect Answer 2 (Increased appetite and prolonged sleep periods): This is the opposite of the expected NAS presentation. Newborns with NAS typically have a disorganized, frantic sucking pattern and poor feeding, leading to excessive weight loss. Sleep is characteristically disturbed with short, fragmented periods, not prolonged sleep .
Incorrect Answer 3 (Jaundice and hepatomegaly): While jaundice is common in all newborns due to physiologic hyperbilirubinemia, it is not a specific or most indicative sign of opioid withdrawal. Hepatomegaly is not a typical feature of NAS but could be associated with other in utero exposures, such as polysubstance use or infections . The question asks for the most indicative* finding, which points to the direct neurologic manifestation of withdrawal.

Clinical Assessment and Nursing Implications
Accurate assessment is the cornerstone of NAS management. The diagnosis is clinical, based on a detailed maternal history and the newborn's symptomatology ^[1]. Standardized assessment tools, such as the Finnegan Neonatal Abstinence Scoring System, are used to quantify the severity of withdrawal by scoring items like crying, tremors, muscle tone, and sleep disturbance . Recent evidence emphasizes non-pharmacologic interventions as first-line treatment, including rooming-in, breastfeeding support (if not contraindicated), swaddling, and minimizing environmental stimulation [1,3]. Pharmacologic treatment, typically with an opioid like morphine, is reserved for cases where non-pharmacologic measures fail to control severe symptoms, with the goal of reducing pharmacologic opioid exposure and shortening hospitalization [2,3]. The nurse's role is critical in performing serial assessments, implementing comfort measures, and evaluating the newborn's response to treatment to prevent complications like poor weight gain and seizures .