Platelet count is not the primary diagnostic test used to monitor the therapy’s effect of warfarin. Platelets are involved in the clotting process, but warfarin specifically works by inhibiting the synthesis of vitamin K-dependent clotting factors, which does not directly involve platelets.

Choice B rationale

The white blood cell count (WBC) is not used to monitor the effect of warfarin therapy. WBC is typically used to monitor for infection or inflammation, not the coagulation status of a patient.

Choice C rationale

Prothrombin time (PT) is the correct answer. Warfarin therapy is monitored using the PT, which is reported as the International Normalized Ratio (INR). Warfarin inhibits the synthesis of vitamin K-dependent clotting factors, which include Factors II, VII, IX, and X, and Proteins C and S. The PT/INR is sensitive to changes in these factors. An elevated INR indicates a higher risk of bleeding, while a lower INR suggests a higher risk of clotting.

Choice D rationale

Activated partial thromboplastin time (aPTT) is not typically used to monitor warfarin therapy. The aPTT test evaluates the intrinsic and common pathways of coagulation, which includes factors XII, XI, IX, VIII, X, V, II (prothrombin), and I (fibrinogen). Warfarin affects the extrinsic pathway and common pathway, not the intrinsic pathway. Therefore, aPTT is not the best test to monitor the effects of warfarin.

Choice A rationale

Daily measurement of abdominal girth is crucial in patients with an intestinal obstruction undergoing continuous gastrointestinal decompression. This is because any changes in the abdominal girth can indicate an improvement or worsening of the obstruction. Regular monitoring allows for timely intervention and adjustment of the care plan.

Choice B rationale

Maintaining the patient in Fowler’s position can help promote the drainage of gastric contents via the nasogastric tube. This position, where the patient is seated in bed at an angle of 45-60 degrees, uses gravity to assist in the drainage process, thereby potentially alleviating discomfort and reducing the risk of aspiration.

Choice C rationale

Moistening the patient’s lips with lemon glycerin swabs is not recommended. While it’s important to keep the patient’s lips moist to prevent dryness and cracking due to the nasogastric tube, lemon glycerin swabs can potentially dry out the lips more and cause irritation.

Choice D rationale

Using sterile water to irrigate the nasogastric tube is a standard practice in managing patients with a nasogastric tube. This helps ensure the patency of the tube and prevent blockages, allowing for effective gastrointestinal decompression.