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Zorluk: KolayCardiovascular System

A 55-year-old male comes to the outpatient clinic reporting a 3-week history of swelling in both of his ankles. He mentions that his shoes feel uncomfortably tight by the end of the day. One month ago, he was diagnosed with primary hypertension and was started on amlodipine monotherapy. He denies any difficulty breathing, waking up at night gasping for air, chest discomfort, or recent travel. Vital signs are within normal limits, with a blood pressure of 126/80 mm Hg. Physical examination reveals 2+ pitting edema over the bilateral medial malleoli. The overlying skin is intact, with no erythema, warmth, or tenderness. Jugular venous pressure is 6 cm H2O. Lungs are clear to auscultation bilaterally, and cardiac auscultation reveals a regular rate and rhythm with no extra heart sounds. Which of the following is the most appropriate next step in the management of this patient?

  1. Discontinue amlodipine and prescribe lisinoprilCevap
  2. B
    Initiate therapy with oral furosemide
  3. C
    Schedule a transthoracic echocardiogram
  4. D
    Prescribe a course of oral amoxicillin-clavulanate
  5. E
    Order serum thyroid-stimulating hormone and free T4 levels

Cevap

Discontinue amlodipine and prescribe lisinopril
The most appropriate next step is to discontinue amlodipine and prescribe an ACE inhibitor like lisinopril. Amlodipine, a dihydropyridine calcium channel blocker (CCB), commonly causes dose-dependent peripheral edema. This occurs because CCBs preferentially dilate precapillary arterioles, increasing capillary hydrostatic pressure and driving fluid into the interstitium. ACE inhibitors (like lisinopril) or ARBs induce postcapillary venodilation, which helps normalize capillary pressure and significantly reduces the incidence of CCB-induced edema. Therefore, stopping the offending medication and switching to a different antihypertensive class that counteracts this mechanism is the optimal management.

Adım Adım Çözüm

1
Analyze the patient's presentation and medication history.
The patient developed bilateral pitting lower extremity edema shortly after starting amlodipine, a dihydropyridine calcium channel blocker (CCB).
Establishing a timeline between medication initiation and symptom onset helps identify adverse drug effects.
2
Rule out other common causes of bilateral lower extremity edema.
Normal jugular venous pressure and clear lungs make heart failure unlikely. The lack of erythema or warmth rules out cellulitis.
It is necessary to ensure the edema is an isolated finding and not a sign of systemic disease (e.g., heart failure, liver disease) or infection.
3
Determine the appropriate management for CCB-induced peripheral edema.
The best management is to discontinue the offending agent and/or switch to an ACE inhibitor or ARB.
ACE inhibitors cause postcapillary venodilation, which balances the precapillary vasodilation caused by CCBs, thereby reducing capillary hydrostatic pressure and resolving the edema.

Anahtar Kavram

Dihydropyridine calcium channel blockers (e.g., amlodipine) frequently cause peripheral edema due to precapillary arteriolar vasodilation. This is best managed by discontinuing the CCB or switching to an ACE inhibitor/ARB.
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Cardiovascular System

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