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Zorluk: OrtaMonitoring and Treatment Evaluation

During morning rounds in the intensive care unit, the medical team evaluates a patient receiving treatment for an acute massive pulmonary embolism. The 58-year-old male, who has a documented history of advanced chronic kidney disease (stage G4), was started on a continuous intravenous unfractionated heparin infusion upon admission. Which of the following laboratory parameters must be routinely monitored to ensure the efficacy and safety of this specific anticoagulant therapy? (Select all that apply)

  1. Activated partial thromboplastin time (aPTT)Cevap
  2. Platelet countCevap
  3. C
    International Normalized Ratio (INR)
  4. D
    Serum creatinine
  5. E
    D-dimer

Cevap

The correct parameters to monitor are the Activated partial thromboplastin time (aPTT) and the Platelet count.
The correct answers identify the aPTT and platelet count as essential monitoring parameters. Unfractionated heparin primarily affects the intrinsic coagulation pathway, meaning its therapeutic efficacy must be titrated using the aPTT (or anti-factor Xa levels). Additionally, unfractionated heparin carries a significant risk of heparin-induced thrombocytopenia (HIT), necessitating serial monitoring of the platelet count to promptly identify sudden drops that indicate this dangerous immune-mediated reaction.

Adım Adım Çözüm

1
Identify the primary medication and its pharmacokinetic profile.
The patient is receiving a continuous intravenous infusion of unfractionated heparin.
Different anticoagulants target different parts of the coagulation cascade and have distinct clearance and adverse effect profiles.
2
Determine the necessary efficacy monitoring parameter for this specific drug.
Activated partial thromboplastin time (aPTT) is selected.
Unfractionated heparin inhibits factors IIa and Xa, affecting the intrinsic pathway, which is measured by aPTT to ensure the infusion dose is within the therapeutic window.
3
Determine the necessary safety monitoring parameter unique to this specific drug.
Platelet count is selected.
Unfractionated heparin carries a high risk of causing heparin-induced thrombocytopenia (HIT), requiring serial platelet count monitoring to detect potentially catastrophic immune-mediated drops in platelets.

Anahtar Kavram

Monitoring Unfractionated Heparin Therapy
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Konular

Monitoring and Treatment Evaluation

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