Correct Answer: A

Rationale: The correct answer is A because a viral illness few weeks before can trigger Guillain-Barre Syndrome (GBS) due to the body's immune response attacking the peripheral nerves. Encephalitis (B), severe bacterial infection (C), and meningitis (D) are not directly linked to GBS pathophysiology. Viral infections are known to precede GBS development, making choice A the most appropriate option.

Correct Answer: B

Rationale: The correct initial step before starting TPN is to evaluate the patient's tolerance to glucose. This is crucial to ensure the patient can metabolize the glucose effectively and avoid complications such as hyperglycemia. Assessing affordability (A) is important but not the immediate concern. Identifying allergies (C) should be done but is not the first step. Assessing the patient's understanding (D) is important but not as critical as evaluating glucose tolerance before starting TPN.

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: A

Rationale: The correct answer is A: Rotator cuff tear. The presentation of acute shoulder pain and limited range of motion after a fall onto an outstretched hand, along with tenderness over the greater tuberosity and pain with passive abduction and external rotation, is classic for a rotator cuff tear. The mechanism of injury and physical exam findings are consistent with this condition. B: Glenohumeral dislocation typically presents with a visibly deformed shoulder and loss of normal shoulder contour. C: Acromioclavicular joint separation would present with tenderness over the AC joint rather than the greater tuberosity, and typically involves a history of direct trauma to the shoulder. D: Proximal humerus fracture would present with more diffuse shoulder pain and swelling, and not specific tenderness over the greater tuberosity.

Correct Answer: B

Rationale: The correct answer is B: pulse rates. Pulse rates can be analyzed on the ratio level of measurement because they have a true zero point and allow for meaningful ratios to be calculated. This means that we can perform operations such as addition, subtraction, multiplication, and division on pulse rate data. In contrast, the other options (A: eye color, C: ethnicity, D: gender) are categorical data that do not have a true zero point and therefore cannot be analyzed on the ratio level. Eye color, ethnicity, and gender are all examples of nominal data which only allow for qualitative classification and do not have a numerical value that can be used in mathematical operations.