Ketamine's analgesia is greater for which type of pain?

Ketamine's analgesia is greater for which type of pain?

• A. Visceral pain
• B. Somatic pain
• C. Both equally
• D. None

Answer: (B)

Ketamine works by blocking NMDA receptors, which are central to the development of central sensitization and wind-up in the spinal cord. Somatic pain—coming from skin and muscle—relies more on this kind of amplified spinal processing, so stopping NMDA receptor activity with ketamine reduces the amplification of pain signals and yields stronger analgesia. Visceral pain, from internal organs, involves different afferent pathways and modulatory mechanisms that are less dependent on NMDA-mediated central sensitization, so ketamine’s analgesic effect tends to be less robust for visceral pain. That’s why its analgesia is greater for somatic pain.

Ketamine works by blocking NMDA receptors, which are central to the development of central sensitization and wind-up in the spinal cord. Somatic pain—coming from skin and muscle—relies more on this kind of amplified spinal processing, so stopping NMDA receptor activity with ketamine reduces the amplification of pain signals and yields stronger analgesia. Visceral pain, from internal organs, involves different afferent pathways and modulatory mechanisms that are less dependent on NMDA-mediated central sensitization, so ketamine’s analgesic effect tends to be less robust for visceral pain. That’s why its analgesia is greater for somatic pain.