Exhibits Choose the most likely options for the information missing from the statement by selecting from the list of options provided. The nurse knows that the mastitis in this scenario is most likely caused by dropdownas evidenced bydropdown

Rationale for Correct Choices • A plugged duct: Mastitis most commonly results from milk stasis due to a blocked or plugged duct. The client’s history of missing direct breastfeeding for several hours while the baby was bottle-fed increases the risk of ductal obstruction. Stagnant milk allows bacterial growth, leading to localized inflammation and infection. • The firm red area at the 9 o’clock position: A firm, localized, warm, red area on the breast is a hallmark sign of a plugged duct that has progressed to mastitis. The finding indicates obstruction and subsequent inflammation in a specific ductal region, supporting the diagnosis. Rationale for Incorrect Choices • A nipple fissure: A nipple fissure can serve as an entry point for bacteria but is not the primary cause in this case. The client’s nipple was described as intact and round post-feeding, indicating there were no cracks or lesions predisposing her to infection through the skin surface. • Thrush: Thrush (Candida infection) presents with shiny, red, burning nipples and a white coating in the infant’s mouth, neither of which are reported. There is also no mention of sharp nipple pain during or after feeds, making yeast infection unlikely. • The nipple being round with mature milk post feeding: A round nipple and mature milk reflect effective latch and milk transfer on the unaffected breast, not an indicator of mastitis. This finding supports healthy breastfeeding mechanics rather than pathology. • The client being 2 weeks postpartum: While mastitis often develops within the first few postpartum weeks, timing alone does not confirm the cause. The localized firm, red area provides more direct evidence of a plugged duct as the underlying factor.