A nurse is reviewing the laboratory results of a client who has been taking warfarin for 3 months. Which of the following laboratory results Indicates that the medication has been effective?

When caring for a client receiving heparin by continuous IV infusion for the treatment of venous thrombosis, the nurse should monitor the client's aPTT (Activated Partial Thromboplastin Time) to titrate the heparin dose.

Heparin is an anticoagulant medication used to prevent and treat blood clots. The aPTT is a coagulation test that measures the time it takes for the blood to clot when a specific activator is added. Monitoring the aPTT is a standard method for assessing the anticoagulant effect of heparin and ensuring that the client's blood remains within the desired therapeutic range.

The therapeutic range for aPTT while on heparin therapy varies depending on the indication and the client's condition but is generally maintained at a level that prolongs the clotting time enough to prevent and treat thrombosis while avoiding excessive bleeding risk.

Let's go through the other options:

A. Platelet function assay: While monitoring platelet function is essential for assessing overall hemostasis and platelet function, it is not specifically used for titrating heparin doses. Platelet function assays are more commonly used to assess the function of platelets in the context of platelet disorders or antiplatelet medication therapy.

C. INR (International Normalized Ratio): The INR is used to monitor the effect of vitamin K antagonist anticoagulants, such as warfarin, and is not the appropriate test for monitoring heparin therapy.

D. Amylase: Amylase is an enzyme produced by the pancreas and salivary glands and is not relevant for monitoring heparin therapy. Elevated amylase levels are typically associated with pancreatitis and not related to heparin treatment.

When assessing a client receiving ciprofloxacin, the nurse should prioritize reporting tendon pain when walking to the provider. Ciprofloxacin is a fluoroquinolone antibiotic that can rarely cause tendonitis or tendon rupture, particularly in the Achilles tendon. Tendon pain, especially when associated with difficulty walking, can be indicative of a serious adverse effect and requires immediate attention and evaluation by the provider.

Nausea and vomiting (A) are common side effects of ciprofloxacin but are typically not considered urgent or life-threatening. They can often be managed with supportive care measures and may not require immediate intervention.

Daytime drowsiness (B) is not typically associated with ciprofloxacin and may be unrelated to the medication. It should be assessed and reported if it persists or is severe, but it is not a priority finding specifically related to ciprofloxacin administration.

Photosensitivity (D) is a known side effect of ciprofloxacin, but it is not typically considered a priority finding unless it is severe or causing significant discomfort. Adequate sun protection measures can help manage photosensitivity.