Correct Answer: C

Rationale: The correct answer is C: Acquired von Willebrand syndrome. This condition is characterized by a defect in von Willebrand factor function, leading to prolonged bleeding time and mucocutaneous bleeding. Normal platelet count rules out Glanzmann thrombasthenia and Bernard-Soulier syndrome which are platelet disorders. Normal PT and aPTT rule out Hemophilia A, a coagulation factor deficiency. Acquired von Willebrand syndrome is the most likely cause based on the clinical presentation and laboratory findings.

Correct Answer: B

Rationale: The correct answer is B: Negligence. Negligence refers to the failure to exercise the care that a reasonably prudent person would under similar circumstances. In this case, administering the wrong dose of a vaccine indicates a lack of proper care or attention to detail, which constitutes negligence. A: Battery involves intentional harmful or offensive contact without consent, which is not applicable in this situation. C: Assault involves the threat of harm or unwanted physical contact, which is also not relevant here. D: Malpractice typically refers to professional misconduct or negligence by a healthcare provider, which could be a broader term but not specific to the situation described.

Correct Answer: C

Rationale: The correct answer is C: Secures clean ties before removing soiled ones. This is the priority action because securing clean ties prevents accidental dislodgement of the tracheostomy tube, ensuring the patient's airway remains patent. Cutting the dressing (A) or cleaning the incisions (B) can be important but not as critical as securing the tube. Using clean technique (D) is essential but not the priority in this situation.

Correct Answer: C

Rationale: The correct answer is C: Hyponatremia. SSRI medications can lead to the syndrome of inappropriate antidiuretic hormone secretion (SIADH), causing hyponatremia. This occurs due to increased levels of serotonin affecting the hypothalamus, leading to excessive ADH release. Hyponatremia can result in neurological symptoms and must be closely monitored. A: Bradycardia is not a common adverse effect of SSRIs. B: Hyperkalemia is not typically associated with SSRIs. D: Hypertension is not a common adverse effect of SSRIs; they may actually lower blood pressure.

Correct Answer: C

Rationale: The correct answer is C: Cells die. In Alzheimer's disease, there is a progressive degeneration of brain cells, leading to cell death. This results in a loss of important brain functions such as memory, cognition, and eventually, bodily functions. The atrophy of the brain stem (choice A) is not a characteristic feature of Alzheimer's. Fluid buildup (choice B) is not a primary mechanism of the disease. Tissue swelling (choice D) is not typically associated with the progression of Alzheimer's; rather, there is a gradual loss of brain tissue due to cell death.