* Irony: The heart condition immediately sets up a dramatic irony. The reader knows from the start that Mrs. Mallard is vulnerable and could be affected by strong emotions. This knowledge makes her subsequent reaction to the news of her husband's death all the more impactful and unexpected.
* Symbolism: Mrs. Mallard's heart condition can be interpreted as a symbol of her repressed emotions and her societal constraints. She's literally living with a condition that makes her vulnerable, mirroring her social position as a woman who is expected to be subservient and emotionally contained.
* Foreshadowing: The mention of the heart condition foreshadows the dramatic climax of the story. It subtly hints at the possibility of her death, albeit in a different way than anticipated. This foreshadowing also creates suspense and keeps the reader engaged in wondering what will happen to Mrs. Mallard.
* Dramatic Effect: By mentioning the heart condition, Chopin immediately establishes a sense of urgency and potential danger. The reader is immediately invested in Mrs. Mallard's well-being and eager to know how she will react to the news.
Ultimately, the inclusion of Mrs. Mallard's heart condition is a brilliant literary device that enriches the story's themes of freedom, repression, and the complex nature of love and loss. It creates a multi-layered narrative that keeps the reader engaged and prompts them to contemplate the deeper meanings behind Mrs. Mallard's unexpected and tragic fate.