A client with diabetic ketoacidosis (DKA) is receiving an IV infusion of 0.9% sodium chloride and insulin.
Two hours later, the client’s serum laboratory results show a decrease in the serum blood glucose from 580 to 430 mg/dL (32.2 to 23.86 mmol/L). What additional laboratory result is most important for the nurse to monitor?

Choice A rationale
Determining the presence of ST-elevations or non-ST-elevations on the electrocardiogram is an important step in diagnosing a myocardial infarction. However, this is typically performed by a healthcare provider or a trained technician, not a nurse.
Choice B rationale
While creating a calm and quiet environment can be beneficial for a client experiencing chest pain, it is not the immediate intervention that should be performed. The client’s symptoms suggest a possible cardiac event, which requires immediate medical intervention.
Choice C rationale
Verifying that troponin level assessments are scheduled every 3-6 hours for a series of three is important for diagnosing myocardial infarction. However, this is not the immediate intervention that should be performed. The client’s symptoms suggest a possible cardiac event, which requires immediate medical intervention.
Choice D rationale
Applying oxygen via nasal cannula and titrating to keep oxygen saturation above 93% is the correct intervention. This action helps to increase the oxygen supply to the myocardium, potentially decreasing the extent of myocardial damage and relieving chest pain.

Choice A rationale

Heparin is an anticoagulant medication that prevents the formation of blood clots. One of the most common and serious side effects of heparin therapy is bleeding. Therefore, it is crucial for the nurse to observe for signs of bleeding, such as bruising, petechiae, hematomas, black tarry stools, hematuria, and changes in mental status. Regular laboratory monitoring of the client’s coagulation status, specifically the activated partial thromboplastin time (aPTT), is also necessary to ensure therapeutic levels of heparin without causing excessive bleeding.

Choice B rationale

While mobilization can help prevent the formation of new clots, it is not the most important intervention for a client who is already on a heparin protocol for DVT. Mobilization can potentially dislodge the existing clot, leading to a life-threatening pulmonary embolism.

Choice C rationale

Although it is important to monitor vital signs in all clients, assessing blood pressure and heart rate every 4 hours is not the most important intervention for a client on a heparin protocol.

Changes in blood pressure and heart rate are not specific to heparin therapy and do not provide direct information about the effectiveness or side effects of the medication.

Choice D rationale

Measuring each calf’s girth can help evaluate the progression of edema in the affected leg, but it is not the most important intervention for a client on a heparin protocol. While it can provide information about the local effects of the DVT, it does not address the systemic anticoagulation effects of heparin therapy.