What is the symbolism of the broken wine glass in the story, The Long QT?

The wine glass, carried by the wife of the adulterous husband, in the story, The Long QT, is dropped and shattered when she discovers her husband’s intent to cheat on her. Thus, the wine glass serves as a symbol of her frail and broken heart, which suffers from an undiagnosed and untreated QT syndrome and can lead to cardiac arrest and death given a sudden shock or emotional extreme.