Management of Agitation in Elderly Patients with Advanced Cancer and Delirium

First-line Pharmacological Management

The American Society of Clinical Oncology recommends olanzapine 2.5-5 mg orally or subcutaneously as a starting dose for managing agitation in elderly patients with advanced cancer and delirium, with dose reduction appropriate for advanced age 1
Olanzapine has demonstrated superior efficacy in improving delirium agitation in patients with advanced cancer, with a recent study showing significantly higher odds of symptom control compared to other antipsychotics 1
For elderly patients, starting at the lower end of the dosing range (2.5 mg) is prudent due to age-related changes in drug metabolism 1

The National Comprehensive Cancer Network recommends quetiapine 25 mg (immediate release) orally as an alternative option if olanzapine is not tolerated or available 1, 2
Quetiapine has advantages including lower risk of extrapyramidal side effects and sedating properties that can help manage agitation 1, 2
Risperidone 0.5 mg orally could be considered as another alternative, but should be used at reduced doses in older patients and those with severe renal or hepatic impairment 1, 2

Antipsychotics themselves can potentially cause increased agitation and delirium, so careful monitoring is essential 1
Short-term use at the lowest effective dose is recommended, particularly when the patient poses a risk to themselves or others 1, 2
Monitor for common side effects including drowsiness, orthostatic hypotension, and extrapyramidal symptoms 1

The National Comprehensive Cancer Network recommends that benzodiazepines alone are not used as first-line treatment for delirium in patients not already taking them 2
However, for severe agitation refractory to antipsychotics, a benzodiazepine such as lorazepam (0.25-0.5 mg) may be added 1, 2
Use with caution in elderly patients due to increased risk of falls, respiratory depression, and paradoxical agitation 1

The patient's advanced age necessitates starting at lower doses of any antipsychotic medication 1
Well-controlled pain is important to maintain, as uncontrolled pain can worsen delirium 2
If delirium symptoms worsen despite antipsychotic therapy, consider opioid rotation as neurotoxicity from the current opioid could be contributing to delirium 2

For patients unable to swallow, consider alternative antipsychotics such as haloperidol or levomepromazine, as low-dose prophylactic quetiapine has shown benefit in reducing delirium duration and improving outcomes in critically ill patients 3, 4
Haloperidol 0.5-1 mg orally at night and every 2 hours as needed can be used for patients who can swallow, while levomepromazine 12.5-25 mg subcutaneously can be used for patients unable to swallow 3, 4
The British Medical Journal recommends that benzodiazepines alone are not used as first-line treatment for delirium but may be added for severe agitation refractory to antipsychotics 4
The British Medical Journal suggests addressing reversible causes of delirium first, such as hypoxia, urinary retention, and constipation, and ensuring effective communication, adequate lighting, and orientation to reduce delirium severity 4