Question

Mr. Yao is a patient with kidney disease who presents to your clinic for monitoring. You notice on his chart that his GFR was estimated through inulin administration to be about 35 ml/min. What does this tell you about the health of his kidneys? Mr. Yao is taking a medication that is normally excreted from the body in the urine. You order blood work and find that the concentration of this medication in his plasma is much higher than normal. How does his decreased GFR explain the elevated level of medication in his plasma?

Accepted Answer

Step 1: Understand the concept of Glomerular Filtration Rate (GFR). GFR is a measure of how well the kidneys filter blood. A normal GFR is typically around 90-120 ml/min. A GFR of 35 ml/min indicates significantly reduced kidney function, which is consistent with kidney disease. Step 2: Recognize the role of the kidneys in excreting medications. The kidneys filter waste products and medications from the blood into the urine. If kidney function is impaired, the filtration process is less efficient, leading to reduced excretion of medications. Step 3: Relate decreased GFR to medication clearance. With a GFR of 35 ml/min, Mr. Yao's kidneys are filtering blood at a much slower rate. This means that the medication is not being removed from the plasma as effectively, causing its concentration in the blood to rise. Step 4: Consider the implications of reduced medication excretion. The elevated plasma concentration of the medication could lead to toxicity or reduced therapeutic effectiveness. Adjustments to the medication dosage may be necessary to account for impaired kidney function. Step 5: Highlight the importance of monitoring kidney function and medication levels. Regular blood work and GFR assessments are crucial for patients with kidney disease to ensure proper medication management and prevent complications.

비슷한 문제에 대한 검증된 영상 답변:

주요 개념

Glomerular Filtration Rate (GFR)

Renal Excretion of Medications

Pharmacokinetics in Kidney Disease