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Ketamine is a medication approved by the United States Food and Drug Administration (FDA) for use as a general anesthetic. It is also used to enhance the effects of low-potency substances and is invaluable in pain management, treating depression, managing suicidal ideation, and treating refractory status epilepticus. While ketamine is generally safe for medical use, it can become dangerous when used recreationally. A ketamine overdose can lead to impaired alertness, rigid muscles, inability to move, and even death. In rare cases, ketamine has also been found to cause muscle rigidity, which can be mitigated by intravenous midazolam.
| Characteristics | Values |
|---|---|
| Ketamine-induced muscle rigidity | Rare but potentially serious side effect |
| Muscle rigidity occurrence | During induction of anesthesia in nonparalyzed patients or during emergence from anesthesia |
| Muscle rigidity occurrence time | Up to 5 hours after cessation of anesthesia |
| Muscle rigidity treatment | Administration of general anesthesia, neuromuscular blocker, or naloxone |
| Muscle rigidity mitigation | Intravenous midazolam |
| Ketamine use | General anesthetic, pre-anesthetic for the induction of general anesthesia, and anesthetic for brief medical procedures that do not require muscle relaxation |
| Ketamine benefits | Highly effective, rapid sequence intubation, bronchodilatory properties, safe for a wide age range, pain management, treatment-resistant depression, managing suicidal ideation, treating refractory status epilepticus |
| Ketamine adverse effects | Nausea, vomiting, dizziness, diplopia, drowsiness, dysphoria, confusion, cardiovascular issues, gastrointestinal issues, muscle stiffness, spasms, psychiatric issues, liver injury, cognitive deficits, hallucinations, addiction |
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What You'll Learn
Ketamine is a dissociative anesthetic
Ketamine is a medication approved by the United States Food and Drug Administration (FDA) for use as a general anesthetic. It is often used in emergencies to provide short-term procedural sedation and rapid sequence intubation. The medication is highly effective and has a wide margin of safety. It is also preferred for patients with bronchospasm due to its bronchodilatory properties. Ketamine is used for procedures requiring short-term sedation or anesthesia and can be safely administered to patients ranging from 3 months old to adults.
Ketamine is also gaining traction as a potential treatment for depression due to its unique mechanism of action compared to typical drugs that influence monoamine neurotransmitters such as noradrenaline, dopamine, or serotonin. It is believed that ketamine blocks N-methyl-d-aspartate (NMDA) receptors in the brain, which interact with the amino acid neurotransmitter glutamate. However, the chemical changes in the brain caused by ketamine are not yet fully understood.
Despite its benefits, ketamine has potential side effects, including emergence reactions such as hallucinations, dreams, and out-of-body experiences. Additionally, muscle rigidity is a rare yet serious side effect of ketamine. It is characterized by increased muscular tone, especially when co-administered with morphine. This muscle rigidity can be quickly resolved with the administration of IV benzodiazepines like midazolam.
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Ketamine is used to treat depression
Ketamine is a dissociative psychedelic drug that has been used in hospitals and veterinary clinics as an anesthetic for decades. It is also used recreationally as a drug of misuse under the name "Special K". Ketamine is known to produce pain control, forgetfulness, intoxication, disassociation, and euphoria, effects that underlie its medical and recreational uses.
Ketamine has been found to be effective in treating severe depression that has not improved with several other therapies, including suicidal thoughts. It is not a first-option treatment for depression and is generally used only when other, more longstanding treatments have not been effective. It is not a cure, but it improves symptoms of depression for a certain amount of time.
Ketamine is available as a prescription nasal spray called esketamine (Spravato), which was approved by the FDA in 2019 for hard-to-treat depression. It can be used with or without an oral antidepressant but only in certified health care settings. Research has shown that ketamine nasal spray, in combination with regular antidepressants, helped people stay in stable remission 16 weeks into treatment.
Ketamine is also administered intravenously (IV) and is recommended to be used in conjunction with regular antidepressants. The antidepressant effects of ketamine wear off in hours, days, or a couple of weeks in people who only get a single infusion. A series of infusions has longer-lasting effects.
Side effects of ketamine include dissociation, intoxication, sedation, high blood pressure, dizziness, headache, blurred vision, anxiety, nausea, and vomiting. Ketamine is avoided or used with extreme caution for people with a history of psychosis or schizophrenia, as there is concern that the dissociation ketamine produces can make psychotic disorders worse. It is also important to note that 2% to 4% of heavy ketamine users may develop psychosis.
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Ketamine can cause muscle rigidity in children
Ketamine is a medication approved by the United States Food and Drug Administration (FDA) for use as a general anesthetic. It is also used to enhance the effects of low-potency substances. Ketamine is a popular choice for short-term medical procedures that do not require muscle relaxation.
Ketamine is a safe and effective medication for use in pediatric cases. It is often used as the sole anesthetic for minor procedures in children, especially those with cyanotic heart disease and neuromuscular disorders. It is also used as an induction agent, followed by a neuromuscular blocker and tracheal intubation.
However, ketamine can cause muscle rigidity in children. This is a rare but potentially serious side effect that emergency providers should be aware of. In one study, muscle rigidity occurred in 6.8% of children who received intramuscular ketamine for minor painful procedures. Another case report described bilateral lower extremity muscle rigidity in an adult following ketamine administration for procedural sedation during the reduction of an ankle fracture-dislocation.
The risk of ketamine-induced muscle rigidity can be mitigated by the administration of intravenous benzodiazepines such as midazolam. Benzodiazepines such as lorazepam may also be used to treat seizures, excitation, or muscle rigidity resulting from ketamine overdose.
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Ketamine-induced muscle rigidity can be treated with IV midazolam
Ketamine is a medication approved by the United States Food and Drug Administration (FDA) for use as a general anesthetic. It is highly effective for brief medical procedures that do not require skeletal muscle relaxation. It is also used as a pre-anaesthetic for the induction of general anesthesia when combined with other anesthetic agents. Ketamine is also used in emergencies to provide short-term procedural sedation and rapid sequence intubation.
Ketamine is becoming increasingly popular among emergency providers for procedural sedation. However, ketamine-induced muscle rigidity is a rare yet potentially serious side effect of the drug. During procedural sedation for the reduction of an ankle fracture-dislocation, bilateral lower extremity muscle rigidity occurred following the administration of ketamine. This was resolved with the use of IV midazolam.
Muscle rigidity is a rare occurrence that usually occurs during the induction of anesthesia in non-paralyzed patients or during emergence from anesthesia. These symptoms have been reported up to 5 hours after the cessation of anesthesia. The opioid is thought to cause glottic closure, and in unventilated patients, this may cause ventilatory difficulties.
Ketamine is generally safe, with no reported deaths in children. However, physicians should be aware of the rare side effect of muscle rigidity and be prepared to treat it with IV midazolam if necessary.
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Ketamine is FDA-approved for use with nitrous oxide
Ketamine is a medication approved by the FDA for use as a general anesthetic. It is highly effective for brief medical procedures that do not require skeletal muscle relaxation. It can also be used as a pre-anaesthetic for the induction of general anesthesia when combined with other general anesthetic agents. Ketamine is also used in emergencies to provide short-term procedural sedation and rapid sequence intubation. It is particularly useful for patients with bronchospasm because of its bronchodilatory properties.
Ketamine is FDA-approved for enhancing the effects of low-potency substances such as nitrous oxide. Nitrous oxide is a colourless, odourless gas that has been used in medicine for over 150 years. It is used for inhalational general anesthesia and analgesia for short procedures. Inhaled nitrous oxide is also used recreationally, especially by teens and young adults, but it is not believed to have a strong addiction potential.
Ketamine is also invaluable in pain management, addressing treatment-resistant depression, managing suicidal ideation, and treating refractory status epilepticus. The dosage determines the application and resulting effects of the drug, leading to variations in the prescribing protocol. For instance, sub-dissociative dosing, or low-dose ketamine (LDK), is used either alone or with other pain relief medications.
Ketamine can cause muscle rigidity, a rare yet potentially serious side effect. This muscle rigidity is usually bilateral lower extremity muscle rigidity, which can prevent the reduction of an ankle fracture-dislocation. This side effect can be mitigated by IV midazolam.
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Frequently asked questions
Ketamine hydrochloride, commonly known as ketamine, is a medication approved by the United States Food and Drug Administration (FDA) for use as a general anesthetic. It is also used for pain management, treating depression, managing suicidal ideation, and treating refractory status epilepticus.
Yes, ketamine can cause muscle rigidity, a rare yet potentially serious side effect. This can be mitigated by intravenous midazolam.
The most common adverse reactions associated with ketamine are nausea, vomiting, dizziness, drowsiness, dysphoria, and confusion. High doses of ketamine can also cause death.
