A 4-year-old child is brought to the pediatric clinic with a 3-day history of fever (39.8°C), a bright red "strawberry" tongue, cracked lips, and bilateral conjunctival injection without discharge. The nurse notes cervical lymphadenopathy and a diffuse erythematous rash on the trunk. The parents state the child has been irritable and refusing to eat. Which finding is most important for the nurse to report to the provider immediately due to its association with a serious complication of this condition?
- New-onset complaint of chest pain with tachycardia
- Strawberry tongue with lip cracking
- Cervical lymphadenopathy greater than 1.5 cm
- Bilateral non-exudative conjunctivitis