Focus On , Pharmacology

Ketamine: To Use or Not to Use for Pain Management

Ketamine: To Use or Not to Use for Pain Management
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Mark E. Epstein, DVM, Diplomate ABVP (C/F), CVPP, & dAAPM

Ketamine has been in long and routine use as a dissociative anesthetic. More recently, new pharmacologic features of ketamine have been discovered that provide novel pain modification.

It’s Place in Pain Management

It is well-established in human medicine that the use of adjunct medications, including ketamine, minimizes the use of PCA (patient-controlled analgesia) opioids, with a resulting decrease in incidence of adverse effects, such as postoperative nausea and constipation, which in turn, quickens discharge from the hospital.1

However, ketamine is not considered an analgesic drug. Rather, it appears to be protective against hyperalgesia and central hypersensitization in the postoperative setting.2 These effects can be important in reducing immediate postoperative morbidity and persistent postoperative pain.

In humans, acute postoperative pain is followed by persistent pain in 10% to 50% of individuals after common operations, such as groin hernia repair, breast and thoracic surgery, and amputations. Chronic pain is severe in about 2% to 10% of these patients.3

While we do not have this kind of epidemiologic data in animals, there is little reason to doubt that they can experience severe or protracted pain.

What Research Shows

Various studies in humans and rodent models utilizing ketamine via constant rate infusion (CRI) or transdermal patch revealed that actual pain scores are not lowered significantly; however, there are individual studies which demonstrate that the modality:1,4-6

  •  Reduces opioid consumption by 30%
  •  Improves rehabilitation after arthroplasty
  •  Reduces analgesic drug requirements after abdominal and gynecologic surgery
  •  Results in superior pain control compared to intermittent morphine for musculoskeletal trauma
  •  Provides dose-dependent analgesia for third molar extraction
  •  Demonstrates use as rescue analgesic in opioid-tolerant and opioid-hyperalgesic patients
  • Possibly reduces phantom-limb pain postamputation.

Looking at the totality of human literature regarding the utility of ketamine as a pain-modifying agent, a recent systematic review revealed the following evidence-based conclusions:7

Level I Evidence (Meta-Analyses)

  •  Considered to have “preventive” effects on pain in acute postoperative period
  •  Opioid-sparing
  •  Safe
  •  Most effective as low-dose CRI for acute pain management

Level II Evidence (> One Properly-Designed Randomized Clinical Trial)

  •  Most effective as “antihyperalgesic,” “anti-allodynic,” or “tolerance-protective” treatment
  •  Effective as rescue analgesic for opioid-tolerant patients
  •  Reduces peripheral neuropathic and spinal cord injury pain
  •  Improves fibromyalgia symptoms
  •  Intranasal route reduces breakthrough chronic pain (cancer and noncancer patients)

Application in Veterinary Medicine

In a pair of clinical studies in dogs, one demonstrated a positive pain-modifying effect of CRI ketamine following forelimb amputation8 and another recorded improved feeding behavior postmastectomy.9 In the forelimb amputation study, the study group received a loading dose of ketamine followed by CRI ketamine for 18 hours postoperatively. The authors recorded significantly lower pain scores throughout the study period compared to the control group. Interestingly, the authors also found that the study group dogs were more active than the control group for up to 3 days after surgery. In the mastectomy study, the CRI ketamine was continued for only 6 hours postoperatively in the study group, but improved feeding behavior compared to the control group was observed for up to 20 hours in the postoperative period.

Indications

The question of which surgical patients should receive ketamine CRI is an open one:

  • One subset of patients might be those at greatest risk for postoperative maladaptive pain (eg, fracture repair, aggressive soft tissue procedures).
  • Alternatively, the modality could be incorporated into the transoperative balanced anesthetic and pain management protocol for most patients.

Potential Precautions

Historically, concerns have been expressed about the anesthetic use of ketamine in two populations of patients: those with central nervous system disease, especially seizures and increased intracranial pressure (eg, trauma, neoplasm), and in cats with hypertrophic cardiomyopathy. However, the clinical importance of these concerns with regard to subanesthetic CRI ketamine has not been established.

Administration

Boscan and his colleagues at University of California–Davis found that a plasma ketamine concentration of 2 to 3 mcg/mL elicited the most benefits with minimal adverse effects. This can be achieved in the dog by administering ketamine as a CRI at approximately 10 mcg/kg/min.10

Administering ketamine by CRI is easily accomplished by:

  • Including 60 mg (0.6 mL of 100 mg/mL drug) per liter of crystalloid fluids
  • Administering intravenous fluids at standard intra-operative rates of 10 mL/kg/hr, which delivers ketamine at 10 mcg/kg/min
  • Continuing fluids postoperatively at standard maintenance rates of 2 mL/kg/hr, resulting in a ketamine CRI rate of 2 mcg/kg/min.

In order to rapidly achieve plasma levels, it is recommended that the CRI follow an initial ketamine IV bolus of 0.25 to 0.50 mg/kg. Ketamine CRI can be administered concurrently with CRIs of opioids, such as fentanyl, morphine, and/or lidocaine.11

Duration of Administration

The ideal duration of CRI ketamine is uncertain, although in the studies cited (both very aggressive surgeries with a high predictability for discomfort), it was continued for 20 (forelimb amputation) and 6 (mastectomy) hours. It is interesting to note that the pain-modifying improvements in the ketamine CRI groups in both studies extended even after discontinuation of the CRI—until the studies were completed (3 days and 20 hours, respectively).

Ketamine’s Mechanism of Action

At doses to induce a dissociative anesthetic state, ketamine binds to many receptors throughout the body, including mu-opioid, sigma-opioid, and N-methyl-D-aspartate (NMDA) receptors. NMDA and opioid receptors are closely aligned in many areas of the central nervous system, and interaction has been detected between them.12 Recent work reveals that ketamine may also have dopaminergic effects.13

Ketamine appears to be one of the most potent NMDA antagonists found in clinical medicine, and this activity is demonstrable even at subanesthetic doses, resulting in a pain-modifying effect.

Historically, the focus of analgesia has been to diminish transduction (eg, local anesthesia, anti-inflammatories) and perception (eg, opioids), and indeed these remain crucial components of a multimodal approach to pain management. However, ketamine exhibits its subanesthetic action in the dorsal horn of the spinal cord, where enhancement of nociceptive inhibitory modulation and interruption of the feedback loop that results in exaggerated pain responses and perception takes place.

These additional components of pain management provided by ketamine expand the traditional roles of analgesia.

Why Administer Ketamine?

The ideal veterinary patient, surgery, or procedure for which subanesthetic ketamine CRI is indicated has not been identified. However, while the most optimum situations for ketamine administration are not known at this time, the existing evidence suggests that ketamine has a potential role in perioperative pain management.

The evidence, however, is strong that ketamine CRI at subanesthetic doses:

  •  Is safe and anesthetic-sparing
  •  Improves anesthetic cardiovascular and respiratory parameters
  •  Improves analgesic effects of other drugs
  •  Helps prevent exaggerated and sustained pain states.

In summary, ketamine is one of the most potent drugs available for NMDA-blockade, which accounts for its efficacy as an inhibitor of central hypersensitization and hyperalgesia. Due to its low cost and high safety margin at subanesthetic CRI doses, it appears to be a useful adjunct to many surgical procedures, and may have future applications for the treatment of central or peripheral hypersensitization.

CRI = constant rate infusion;

NMDA = N-methyl-D-aspartate

References

  1. Subramaniam K, Subrmaniam B, Steinbrook RA. Ketamine as adjuvant analgesic to opioids: A quantitative and qualitative systematic review. Anesth Analg 2004; 99(2):482-495.
  2. Slingsby LS, Waterman-Pearson AE. The postoperative analgesic effects of ketamine after canine ovariohysterectomy – a comparison between pre- and post-operative administration. Res Vet Sci 2000; 69(2):147-152.
  3. Gramke HF, de Rijke JM, van Kleef M, et al. The prevalence of postoperative pain in a cross-sectional group of patients after day-case surgery in a university hospital. Clin J Pain 2007; 23(6):543-548.
  4. Bell RF, Dahl JB, Moore RA, Kalso E. Peri-operative ketamine for acute post-operative pain: A quantitative and qualitative systematic review (Cochrane review). Acta Anaesthesiol Scand 2005; 49(10):1405-1428.
  5. Bell RF, Dahl JB, Moore RA, Kalso E. Perioperative ketamine for acute postoperative pain. Cochrane Database Syst Rev 2006; 25(1).
  6. Hayes C, Armstrong-Brown A, Burstal R. Perioperative intravenous ketamine infusion for the prevention of persistent post-amputation pain: A randomized, controlled trial. Anaesth Int Care 2004; 32(3):330-338.
  7. Carr DB (ed). Ketamine: Does life begin at 40? IASP Pain Clinical Updates 2007; XV(3).
  8. Wagner AE, Walton JA, Hellyer PW, et al. Use of low doses of ketamine administered by constant rate infusion as an adjunct for postoperative analgesia in dogs. JAVMA 2002; 221(1):72-75.
  9. Sarrau S, Jourdan J, Dupuis-Soyris F, Verwaerde P. Effects of postoperative ketamine infusion on pain control and feeding behaviour in bitches undergoing mastectomy. J Small Anim Pract 2007; 48(12):670-676.
  10. Boscan P, Pypendop BH, Solano AM, Ilkiw JE. Cardiovascular and respiratory effects of ketamine infusions in isoflurane-anesthetized dogs before and during noxious stimulation. Am J Vet Res 2005; 66(12):2122-2129.
  11. Muir WW, Wiese AJ, March PA. Effects of morphine, lidocaine, ketamine, and morphine-lidocaine-ketamine drug combination on minimum alveolar concentration in dogs anesthetized with isoflurane. Am J Vet Res 2003; 64(9):1155-1160.
  12. Zhang GH, Min SS, Seol GH, et al. Inhibition of NMDA R unmasks the antinociception of endogenous opioids in the periphery. Pain 2009; 143:233-237.
  13. Seeman P, Ko F, Tellerico T. Dopamine receptor contribution to the action of PCP, LSD and ketamine psychotomimetics. Mol Psychiatry 2005; 10(9):877-883.

Mark%20Epstein_fmtMark Epstein, DVM, Diplomate ABVP (C/F), CVPP, & dAAPM, is the senior partner and medical director of TotalBond Veterinary Hospitals and Carolinas Animal Pain Management, a group of AAHA-accredited practices in the Charlotte and Gastonia, North Carolina, area. He is the president of the International Veterinary Academy of Pain Management and the past president of the American Board of Veterinary Practitioners. Dr. Epstein is an author and frequent lecturer on the recognition, prevention, and treatment of pain in the veterinary clinical setting. He received his DVM from University of Georgia.

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value='Mongolia' >Mongolia</option><option value='Montenegro' >Montenegro</option><option value='Montserrat' >Montserrat</option><option value='Morocco' >Morocco</option><option value='Mozambique' >Mozambique</option><option value='Myanmar' >Myanmar</option><option value='Namibia' >Namibia</option><option value='Nauru' >Nauru</option><option value='Nepal' >Nepal</option><option value='Netherlands' >Netherlands</option><option value='New Caledonia' >New Caledonia</option><option value='New Zealand' >New Zealand</option><option value='Nicaragua' >Nicaragua</option><option value='Niger' >Niger</option><option value='Nigeria' >Nigeria</option><option value='Niue' >Niue</option><option value='Norfolk Island' >Norfolk Island</option><option value='North Korea' >North Korea</option><option value='Northern Mariana Islands' >Northern Mariana Islands</option><option value='Norway' >Norway</option><option value='Oman' >Oman</option><option value='Pakistan' >Pakistan</option><option value='Palau' >Palau</option><option value='Palestine, State of' >Palestine, State of</option><option value='Panama' >Panama</option><option value='Papua New Guinea' >Papua New Guinea</option><option value='Paraguay' >Paraguay</option><option value='Peru' >Peru</option><option value='Philippines' >Philippines</option><option value='Pitcairn' >Pitcairn</option><option value='Poland' >Poland</option><option value='Portugal' >Portugal</option><option value='Puerto Rico' >Puerto Rico</option><option value='Qatar' >Qatar</option><option value='Réunion' >Réunion</option><option value='Romania' >Romania</option><option value='Russia' >Russia</option><option value='Rwanda' >Rwanda</option><option value='Saint Barthélemy' >Saint Barthélemy</option><option value='Saint Helena' >Saint Helena</option><option value='Saint Kitts and Nevis' >Saint Kitts and Nevis</option><option value='Saint Lucia' >Saint Lucia</option><option value='Saint Martin' >Saint Martin</option><option value='Saint Pierre and Miquelon' >Saint Pierre and Miquelon</option><option value='Saint Vincent and the Grenadines' >Saint Vincent and the Grenadines</option><option value='Samoa' >Samoa</option><option value='San Marino' >San Marino</option><option value='Sao Tome and Principe' >Sao Tome and Principe</option><option value='Saudi Arabia' >Saudi Arabia</option><option value='Senegal' >Senegal</option><option value='Serbia' >Serbia</option><option value='Seychelles' >Seychelles</option><option value='Sierra Leone' >Sierra Leone</option><option value='Singapore' >Singapore</option><option value='Sint Maarten' >Sint Maarten</option><option value='Slovakia' >Slovakia</option><option value='Slovenia' >Slovenia</option><option value='Solomon Islands' >Solomon Islands</option><option value='Somalia' >Somalia</option><option value='South Africa' >South Africa</option><option value='South Georgia' >South Georgia</option><option value='South Korea' >South Korea</option><option value='South Sudan' >South Sudan</option><option value='Spain' >Spain</option><option value='Sri Lanka' >Sri Lanka</option><option value='Sudan' >Sudan</option><option value='Suriname' >Suriname</option><option value='Svalbard and Jan Mayen Islands' >Svalbard and Jan Mayen Islands</option><option value='Sweden' >Sweden</option><option value='Switzerland' >Switzerland</option><option value='Syria' >Syria</option><option value='Taiwan' >Taiwan</option><option value='Tajikistan' >Tajikistan</option><option value='Tanzania' >Tanzania</option><option value='Thailand' >Thailand</option><option value='Timor-Leste' >Timor-Leste</option><option value='Togo' >Togo</option><option value='Tokelau' >Tokelau</option><option value='Tonga' >Tonga</option><option value='Trinidad and Tobago' >Trinidad and Tobago</option><option value='Tunisia' >Tunisia</option><option value='Turkey' >Turkey</option><option value='Turkmenistan' >Turkmenistan</option><option value='Turks and Caicos Islands' >Turks and Caicos Islands</option><option value='Tuvalu' >Tuvalu</option><option value='Uganda' >Uganda</option><option value='Ukraine' >Ukraine</option><option value='United Arab Emirates' >United Arab Emirates</option><option value='United Kingdom' >United Kingdom</option><option value='United States' >United States</option><option value='Uruguay' >Uruguay</option><option value='US Minor Outlying Islands' >US Minor Outlying Islands</option><option value='Uzbekistan' >Uzbekistan</option><option value='Vanuatu' >Vanuatu</option><option value='Venezuela' >Venezuela</option><option value='Vietnam' >Vietnam</option><option value='Virgin Islands, British' >Virgin Islands, British</option><option value='Virgin Islands, U.S.' >Virgin Islands, U.S.</option><option value='Wallis and Futuna' >Wallis and Futuna</option><option value='Western Sahara' >Western Sahara</option><option value='Yemen' >Yemen</option><option value='Zambia' >Zambia</option><option value='Zimbabwe' >Zimbabwe</option></select> <label for='input_6_10_6' id='input_6_10_6_label' 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