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Zorluk: OrtaPharmacologic Interventions

A 78-year-old woman is brought to the geriatrics clinic by her daughter due to a 2-week history of worsening confusion, daytime lethargy, and a recent mechanical fall at home. The daughter reports that the patient has been increasingly forgetful, occasionally experiencing visual hallucinations, and complaining of a severely dry mouth. Her medical history is significant for painful diabetic neuropathy, overactive bladder, type 2 diabetes mellitus, hypertension, and osteoarthritis of the knees.

Her current medications include:
- Amitriptyline 50 mg daily
- Oxybutynin 5 mg three times daily
- Zolpidem 5 mg at bedtime
- Metformin 1000 mg twice daily
- Lisinopril 10 mg daily

Vital signs:
- Temperature: 37.0°C (98.6°F)
- Blood pressure: 138/84 mmHg (supine), 125/78 mmHg (standing)
- Heart rate: 82/min
- Respiratory rate: 14/min

Laboratory results:
- Sodium: 139 mEq/L
- Potassium: 4.7 mEq/L
- Blood urea nitrogen: 24 mg/dL
- Creatinine: 1.2 mg/dL (baseline 1.1 mg/dL)
- Glucose: 145 mg/dL

Physical examination reveals a frail woman who is disoriented to time and date. Mucous membranes are exceedingly dry. There are no focal neurologic deficits.

Which of the following medications should be immediately discontinued to resolve this patient's current presentation? (Select 3)

  1. AmitriptylineCevap
  2. B
    Lisinopril
  3. C
    Metformin
  4. OxybutyninCevap
  5. ZolpidemCevap

Cevap

The correct medications to discontinue are amitriptyline, oxybutynin, and zolpidem.
The correct interventions involve discontinuing the specific medications that are directly contributing to this patient's anticholinergic toxidrome (dry mouth, visual hallucinations, confusion) and her increased fall risk. Amitriptyline and oxybutynin both possess potent antimuscarinic properties; when used together, they create a massive, synergistic anticholinergic burden that easily precipitates delirium in older adults. Furthermore, amitriptyline causes alpha-1 blockade, contributing to her orthostatic hypotension. Zolpidem is a sedative-hypnotic that independently increases the risk of cognitive impairment, daytime lethargy, and mechanical falls. All three of these medications appear on the AGS Beers Criteria and must be targeted for immediate deprescribing.

Adım Adım Çözüm

1
Analyze the patient's clinical presentation and physical examination.
The patient exhibits classic signs of an anticholinergic toxidrome (delirium, visual hallucinations, dry mucous membranes) alongside orthostatic hypotension and a recent mechanical fall.
Identifying the specific toxidrome and adverse events provides a framework for evaluating the patient's medication list.
2
Review the medication list against the American Geriatrics Society (AGS) Beers Criteria.
Amitriptyline, oxybutynin, and zolpidem are identified as potentially inappropriate medications for older adults due to their adverse effect profiles.
These drugs possess strong anticholinergic properties (amitriptyline, oxybutynin) or direct sedating and fall-inducing properties (zolpidem).
3
Evaluate the laboratory results to determine if other medications require discontinuation.
The mildly elevated creatinine (1.2 mg/dL) does not mandate the cessation of metformin or lisinopril, as there is no evidence of severe acute kidney injury or profound electrolyte derangement.
Ensures that essential chronic disease medications are not inappropriately stopped based on mild, stable laboratory variations.
4
Select the interventions that directly address the etiology of the patient's acute decline.
Amitriptyline, oxybutynin, and zolpidem must be immediately discontinued.
Removing the offending synergistic pharmacologic agents is the definitive treatment for medication-induced delirium and fall risk in the elderly.

Anahtar Kavram

Medication reconciliation and deprescribing of high-risk drugs (Beers Criteria) are essential to resolving medication-induced delirium and preventing falls in older adults.
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Pharmacologic Interventions

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