A 3-year-old child has attained enough mobility, curiosity, and dexterity to explore places in the home that should not be accessed. The child finds a bottle with a liquid under the kitchen sink, and he drinks it. Within minutes he has chest pain. His mother takes him to the emergency department and brings the bottle. Analysis of the residual contents reveals a pH of 12. Which of the following complications is most likely to occur following this injury?