Correct Answer: C

Rationale: Diminished radial pulses may be seen in patients with arterial emboli. Arterial emboli are blood clots that travel through the bloodstream and get lodged in a blood vessel, blocking blood flow to a certain area. When an embolus affects the arteries supplying the arm, it can lead to diminished pulses in the affected arm, such as the radial pulse in the wrist. This diminished pulse is due to decreased blood flow to the area beyond the blockage caused by the embolus. This distinguishes arterial emboli from the other options listed, as aortic insufficiency, hyperthyroidism, and early "warm" septic shock typically do not cause isolated diminished radial pulses.

Correct Answer: D

Rationale: The group of lymph nodes that lie just behind the sternocleidomastoid muscles bilaterally are known as the posterior cervical lymph nodes. These lymph nodes are part of the superficial cervical lymph node chain, which is involved in draining lymph from the head and neck region. In the case described, the presence of sore throat, fever, and enlarged tonsils with exudates suggests a likely upper respiratory tract infection or tonsillitis, leading to the enlargement of the nearby lymph nodes. The posterior cervical lymph nodes are commonly examined in cases of upper respiratory infections and tonsillitis due to their proximity to the area of infection and inflammation.

Correct Answer: C

Rationale: Diminished radial pulses may be seen in patients with arterial emboli. Arterial emboli are blood clots that travel through the bloodstream and get lodged in a blood vessel, blocking blood flow to a certain area. When an embolus affects the arteries supplying the arm, it can lead to diminished pulses in the affected arm, such as the radial pulse in the wrist. This diminished pulse is due to decreased blood flow to the area beyond the blockage caused by the embolus. This distinguishes arterial emboli from the other options listed, as aortic insufficiency, hyperthyroidism, and early "warm" septic shock typically do not cause isolated diminished radial pulses.

Correct Answer: A

Rationale: In order to listen carefully for S splitting, one should use the diaphragm with light pressure over the 2nd right intercostal space. S splitting refers to a split of the second heart sound (S2) into its two components - A2 and P2. The A2 component is normally heard as the main heart sound when the aortic valve closes, and the P2 component is heard when the pulmonic valve closes. By placing the diaphragm lightly over the 2nd right intercostal space, one can best auscultate the aortic area and listen for the timing and splitting of the S2 components. Using the bell or applying firm pressure may not allow for optimal detection of S splitting in this specific case.

Correct Answer: A

Rationale: The raised, dark red rash that does not blanch when pressed on, typically known as erythema nodosum, is a common skin manifestation of systemic lupus erythematosus (SLE). Given Mrs. Hill's history of SLE, it is likely that her rash is related to her autoimmune condition rather than an exposure to a chemical or an allergic reaction. It is important for her to discuss this new symptom with her healthcare provider to ensure appropriate management and monitoring of her lupus.