Correct Answer: C

Rationale: Osteoarthritis in the hip joint can lead to weakness or dysfunction in the hip abductor muscles, causing a Trendelenburg gait. This gait abnormality is characterized by a dropping of the pelvis on the opposite side of the affected hip during weight-bearing on the affected leg. It is a common clinical manifestation of hip osteoarthritis due to the muscle weakness and altered mechanics in the hip joint. Baker's cyst is associated with knee osteoarthritis, Heberden's nodes are commonly seen in osteoarthritis of the fingers, and Swan-neck deformity is typically seen in rheumatoid arthritis, not osteoarthritis.

Correct Answer: A

Rationale: Quality improvement measures are most effective when everyone within an organization is involved. This includes not only professional and management staff but also consumers or customers who are directly impacted by the products or services being provided. By involving everyone, a more comprehensive and diverse perspective can be gained, leading to better identification of areas for improvement and more successful implementation of quality improvement initiatives. Additionally, by involving all stakeholders, there is a greater buy-in and commitment to the process, increasing the likelihood of sustainable improvements being made.

Correct Answer: D

Rationale: Involution refers to the process of the uterus returning to its nonpregnant state after childbirth. During pregnancy, the uterus undergoes significant changes and enlarges to accommodate the growing fetus. After childbirth, the uterus begins to contract, leading to a decrease in its size and a return to its pre-pregnant state. This process involves the shedding of the excess endometrial tissue and the reduction of the size of the uterine muscle fibers. It is a normal and essential process for postpartum recovery. Failure of the uterus to undergo proper involution is known as subinvolution, which can lead to complications such as postpartum hemorrhage.

Correct Answer: D

Rationale: Confusion is a potential adverse effect of digoxin therapy. Digoxin toxicity can manifest as various central nervous system symptoms, including confusion, delirium, and disorientation. It is important to monitor for signs of digoxin toxicity in patients taking this medication, especially those with a history of heart failure or renal impairment. Other common signs of digoxin toxicity may include visual disturbances (like halos around lights), gastrointestinal symptoms (like nausea and vomiting), and cardiac arrhythmias. Monitoring serum digoxin levels can help guide therapy and identify toxicity early.

Correct Answer: D

Rationale: A hard mass and a reddened area on one breast are key clinical signs that confirm the diagnosis of mastitis. Mastitis is an infection of the breast tissue that often presents with localized redness, warmth, and swelling of the breast. The presence of a hard mass along with the other symptoms suggests inflammation and infection within the breast tissue. In contrast, the other findings such as enlarged glands in the axilla, normal temperature, and engorged breasts are not specific findings for mastitis and may be present in other conditions. Therefore, the presence of a hard mass and reddened area on one breast is the additional finding that strongly confirms the diagnosis of mastitis in this case.