Delirium in elderly as the indication of the medication interactions and side effect – 8.15. – 9.1.25

Delirium in elderly as the indication of the medication interactions and side effect 

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Delirium in elderly as the indication of the medication interactions and side effect

Delirium in an elderly person can be a major indicator of adverse drug side effects and dangerous medication interactions

. Age-related physiological changes increase the risk of these issues, which can disrupt brain function and trigger a confused mental state. 

Why medication side effects cause delirium in the elderly

The risk of drug-induced delirium is heightened in older adults due to several factors: 

• Polypharmacy: Elderly patients often take multiple medications for various health conditions. Taking five or more medications, a phenomenon known as polypharmacy, is a major risk factor for delirium.
• Changes in metabolism: As people age, the function of the kidneys and liver—the organs that process and eliminate drugs—slows down. This can cause medications to accumulate in the body and lead to higher drug concentrations, increasing the risk of side effects.
• Increased brain sensitivity: The aging brain is more susceptible to medications that affect the central nervous system, such as anesthetics and psychoactive drugs.
• Comorbidities: The presence of multiple illnesses (multimorbidity) can make older adults more vulnerable to drug side effects. 

Medications with a high risk of causing delirium

Several classes of drugs are commonly linked to delirium in older adults. 

Anticholinergics

Anticholinergic drugs block the neurotransmitter acetylcholine, which is crucial for brain functions like attention and memory. Their use is strongly associated with delirium. 

• Examples: Certain antihistamines (like diphenhydramine), tricyclic antidepressants, and some medications for Parkinson’s disease. 

Benzodiazepines and sedatives

These central nervous system depressants are designed to treat anxiety and insomnia but can trigger or worsen delirium in older adults. 

• Examples: Diazepam, lorazepam, and alprazolam. 

Opioids

Used to manage pain, opioids like morphine and codeine are known to cause delirium, especially in hospitalized and postoperative patients. 

Psychoactive drugs

Many medications that affect brain function can cause delirium as a side effect.

• Examples: Antidepressants, antipsychotics, and anticonvulsants. 

Other medications

A variety of other drugs can cause delirium, especially when used in combination with other risk factors:

• Steroids: Can cause cognitive impairment, with a higher risk in susceptible individuals.
• H2-receptor antagonists: Medications like cimetidine, used for heartburn, have been linked to confusion and delirium.
• Cardiac medications: Digoxin and certain beta-blockers can cause confusion in some elderly patients. 

Recognizing and managing drug-induced delirium

Because delirium is a medical emergency, its recognition is critical for patient safety. 

• Identify reversible factors: Delirium is often preventable and reversible, with drugs being one of the most common causes.
• Conduct a medication review: Healthcare professionals, sometimes with the help of a clinical pharmacist, should review the patient’s medication list for potentially harmful drugs, interactions, and inappropriate dosages.
• “Start low and go slow”: This prescribing philosophy is essential for older adults. Using the lowest effective dose and carefully titrating it upwards can minimize side effects.
• Discontinue the offending agent: When a specific drug is identified as the cause, stopping it or finding an alternative is often the primary treatment. 

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Delirium in elderly as the indication of the medication interactions and side effect
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AI Overview

Delirium in the elderly can indicate underlying medication interactions or side effects, as polypharmacy (multiple medications) and age-related changes increase their susceptibility. A thorough medication history, review of frequently associated drugs like opioids, benzodiazepines, anticholinergics, and diuretics, and a clinical assessment of the patient’s baseline mental status are crucial for diagnosis and management. Identifying and reversing these drug-induced factors is key to treating delirium in this vulnerable population. [1, 2, 3, 4, 5]

Why Elderly Patients Are More Susceptible

• Polypharmacy: Older adults often take multiple medications for various conditions, increasing the risk of harmful drug interactions. [1, 2]
• Age-Related Changes: Age-related physiological changes in the body can alter how medications are processed and affect the brain, making the elderly more prone to drug-induced delirium. [2, 4]
• Comorbidities: The presence of multiple diseases (comorbidities) also raises the risk of developing delirium. [1]

Medications Linked to Delirium

A thorough medication review is vital, as many drug classes can contribute to delirium in older adults. Some common examples include: [4, 6]

• Anticholinergics: Medications with anticholinergic properties are frequently associated with delirium. [4, 6]
• Opioids and Sedatives: Narcotic pain relievers and other sedatives can trigger delirium. [3, 7]
• Benzodiazepines: These anxiety-reducing medications are known causes of drug-induced delirium. [3, 4]
• Antidepressants: Certain antidepressants can increase the risk. [3, 6]
• Diuretics: Diuretics, especially when combined with other drugs, have been linked to delirium. [1, 6]

Key Steps in Diagnosis and Management

1. Thorough Medication History: Obtain a comprehensive list of all medications, including over-the-counter drugs and supplements. [2, 3, 8, 9, 10]
2. Baseline Mental Status: Determine the patient’s usual mental function before the onset of symptoms to distinguish delirium from other conditions like dementia. [5]
3. Focus on Reversible Factors: Drugs are a common and reversible cause of delirium, so identifying and removing the offending medication is a priority for treatment. [4]
4. Medication Review: Engage a clinical pharmacist or geriatrician to perform a detailed medication review, as they have expertise in drug interactions and side effects. [1, 11]
5. Dose Optimization: In cases of drug-induced delirium, adjusting dosages or changing to alternative medications can help resolve the condition. [4, 12, 13, 14]

By understanding these factors, healthcare providers can better identify, prevent, and manage drug-induced delirium in elderly patients. [4, 11]

AI responses may include mistakes.

[1] https://onlinelibrary.wiley.com/doi/full/10.1002/pds.5292

[2] https://www.ncbi.nlm.nih.gov/books/NBK574575/

[3] https://link.springer.com/article/10.2165/11592240-000000000-00000

[4] https://pmc.ncbi.nlm.nih.gov/articles/PMC1743055/

[5] https://pmc.ncbi.nlm.nih.gov/articles/PMC5717753/

[6] https://pmc.ncbi.nlm.nih.gov/articles/PMC7177924/

[7] https://link.springer.com/article/10.1007/s11096-024-01861-4

[8] https://psychiatryonline.org/doi/full/10.1176/foc.7.1.foc53

[9] https://www.everystep.org/about/blog/four-common-medication-problems-in-aging

[10] https://clinicalgate.com/delirium-and-acute-encephalopathies/

[11] https://pmc.ncbi.nlm.nih.gov/articles/PMC5847150/

[12] https://academic.oup.com/pmj/article/80/945/388/7033861

[13] https://pharmaceutical-journal.com/article/ld/delirium-a-guide-to-a-common-condition

[14] https://pmc.ncbi.nlm.nih.gov/articles/PMC6580728/

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