Ketamine in Pain Management

At subanesthetic doses, ketamine antagonizes the N-methyl-D-aspartate receptor and may reduce central sensitization, a rationale most relevant to severe acute pain, opioid tolerance, opioid-induced hyperalgesia, and allodynic pain states. BMJ+1BMJRegional, multimodal, and opioid-sparing strategies after trauma: a review | Trauma Surgery & Acute Care OpenPubMedKetamine for pain management - PMC In perioperative practice, prioritize it for patients expected to have moderate-to-severe postoperative pain or pre-existing opioid tolerance, where opioid-sparing is clinically valuable. BMJBMJRegional, multimodal, and opioid-sparing strategies after trauma: a review | Trauma Surgery & Acute Care Open

For acute postoperative use, intravenous ketamine administered during surgery reduces postoperative pain, opioid consumption, nausea, and vomiting in pooled evidence. CochraneCochranePerioperative intravenous ketamine for acute postoperative ... Its role in trauma is less certain: ICU trials report analgesia comparable with opioids alone, but a randomized trial in severely injured patients found no significant reduction in pain scores or opioid use versus placebo and stopped for futility. BMJBMJRegional, multimodal, and opioid-sparing strategies after trauma: a review | Trauma Surgery & Acute Care Open

For chronic pain, treat ketamine as an off-label option for selected refractory cases rather than routine long-term pharmacotherapy. It has been used for difficult-to-manage conditions including complex regional pain syndrome, but trials and protocols vary substantially, and longer-term safety data are limited. ScienceDirect+1ScienceDirectKetamine for Pain Management—Side Effects & Potential Adverse Events - ScienceDirectPubMedKetamine for pain management - PMC

For perioperative analgesia in a non-ICU setting, do not exceed an intravenous ketamine bolus of 0.35 mg/kg or an infusion rate of 1 mg/kg/hour. BMJBMJKetamine in acute and chronic pain These are ceiling limits rather than mandatory starting doses; titrate within institutional protocols to analgesic response and adverse effects.

Do not use ketamine patient-controlled analgesia as the sole postoperative analgesic strategy on the basis of current consensus evidence. BMJBMJKetamine in acute and chronic pain Pair ketamine with procedure-appropriate multimodal analgesia and regional techniques when indicated, because ketamine is principally an opioid-sparing adjunct rather than a comprehensive postoperative pain plan. BMJ+1BMJRegional, multimodal, and opioid-sparing strategies after trauma: a review | Trauma Surgery & Acute Care OpenCochranePerioperative intravenous ketamine for acute postoperative ...

In the emergency department, low-dose ketamine has shown analgesic effectiveness comparable with morphine within 60 minutes, with comparable safety in a systematic review. BMJBMJKetamine in acute and chronic pain Select this approach when opioid avoidance is desirable or conventional opioid analgesia is inadequate, while ensuring capacity for hemodynamic and neurobehavioral observation. BMJ+1BMJKetamine in acute and chronic painBMJRegional, multimodal, and opioid-sparing strategies after trauma: a review | Trauma Surgery & Acute Care Open

Avoid ketamine in severe or uncontrolled cardiovascular disease because sympathetic stimulation can produce transient hypertension and tachycardia. BMJ+1BMJKetamine in acute and chronic painBMJRegional, multimodal, and opioid-sparing strategies after trauma: a review | Trauma Surgery & Acute Care Open Avoid it in severe liver disease, increased intracranial pressure, increased intraocular pressure, pregnancy, and psychiatric disease associated with psychosis. BMJBMJKetamine in acute and chronic pain

The clinically important acute adverse effects are dissociation, dysphoria, delirium, hallucinations, hypertension, and tachycardia. BMJ+2BMJRegional, multimodal, and opioid-sparing strategies after trauma: a review | Trauma Surgery & Acute Care OpenBMJketamine for acute postoperative pain in adults: study ...PubMedKetamine Toxicity - StatPearls - NCBI Bookshelf High-dose S-ketamine can cause reversible neuropsychiatric effects, including hallucinations. BMJBMJketamine for acute postoperative pain in adults: study ... Monitor mental status and vital signs during infusion, and reduce or stop treatment when adverse effects outweigh analgesic benefit.

Ketamine toxicity may involve neurologic, cardiovascular, psychiatric, urogenital, and abdominal manifestations; acute effects can last from 15 minutes to several hours depending on dose, route, metabolism, and individual sensitivity. PubMedPubMedKetamine Toxicity - StatPearls - NCBI Bookshelf A patient with suspected excessive exposure requires airway, breathing, and circulation assessment rather than management based only on reported pain relief. PubMedPubMedKetamine Toxicity - StatPearls - NCBI Bookshelf

Ketamine for chronic pain is off-label and has been applied to difficult-to-manage pain syndromes, including CRPS. ScienceDirectScienceDirectKetamine for Pain Management—Side Effects & Potential Adverse Events - ScienceDirect It can reduce hyperalgesia and allodynia in some chronic pain contexts, but individual response is variable and the therapeutic decision should follow failure or intolerance of conventional analgesic and nonpharmacologic approaches. BMJ+1BMJ#36946 Ketamine in acute and chronic painScienceDirectKetamine for Pain Management—Side Effects & Potential Adverse Events - ScienceDirect

Do not extrapolate a single CRPS protocol to all patients. A reported routine target in one intravenous CRPS infusion program was 150 mg/hour, or 600 mg over 4 hours, with higher doses considered only for carefully selected patients. Oxford AcademicOxford AcademicIntravenous Ketamine Infusion for Complex Regional Pain ... Conversely, a small study of subanesthetic S(+)-ketamine found no reduction in pain or change in thermal or mechanical detection and pain thresholds. Oxford AcademicOxford AcademicKetamine in Refractory CRPS Patients The contrast supports individualized trials with prespecified efficacy and safety endpoints rather than automatic serial infusions.

Long-term treatment decisions should weigh uncertain durable benefit against neuropsychiatric and urologic risk. In refractory cancer pain, rapid subcutaneous titration to high dose showed no difference in patient-reported pain intensity and nearly twice the incidence of adverse effects. PubMedPubMedKetamine for pain management - PMC If a time-limited trial does not produce meaningful patient-specific improvement without intolerable adverse effects, stop rather than converting to maintenance ketamine. PubMedPubMedKetamine for pain management - PMC

For acute perioperative analgesia, combine ketamine with opioid-sparing multimodal and regional strategies when appropriate to the procedure and patient. BMJ+1BMJRegional, multimodal, and opioid-sparing strategies after trauma: a review | Trauma Surgery & Acute Care OpenCochranePerioperative intravenous ketamine for acute postoperative ... Ketamine should be selected to reduce opioid exposure or improve otherwise inadequate analgesia, not to replace evaluation of a new pain generator, surgical complication, or evolving trauma pathology.

During an infusion, document the administered dose, pain response, opioid use, blood pressure, heart rate, and neurobehavioral adverse effects. BMJ+1BMJRegional, multimodal, and opioid-sparing strategies after trauma: a review | Trauma Surgery & Acute Care OpenPubMedKetamine Toxicity - StatPearls - NCBI Bookshelf This record determines whether further titration remains justified within the non-ICU limits or whether treatment should be stopped because the toxicity-benefit balance has shifted. BMJ+1BMJKetamine in acute and chronic painPubMedKetamine Toxicity - StatPearls - NCBI Bookshelf

For chronic pain programs, require a reproducible benefit before repeat infusions and screen for cumulative adverse effects, particularly psychiatric disturbance and urinary symptoms. PubMed+1PubMedKetamine Toxicity - StatPearls - NCBI BookshelfPubMedKetamine for pain management - PMC A program that cannot provide monitoring and clear discontinuation criteria should not use repeated ketamine exposure as maintenance analgesia. PubMed+1PubMedKetamine Toxicity - StatPearls - NCBI BookshelfPubMedKetamine for pain management - PMC