This video demonstrates how to differentiate between central nervous system depressants (like opium, gelsamine, and barbiturates) and spinal poisons (like strychnine) based on clinical presentation: CNS depressants cause diffuse depression with respiratory rate of six, decreased consciousness, and pinpoint pupils, while strychnine, which inhibits glycine release from spinal interneurons causing muscle spasticity, presents differently. The video emphasizes that strychnine is a postsynaptic spinal poison, whereas tetanus is presynaptic, helping students distinguish between these conditions in clinical scenarios.
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CoreBTR Q Bank MCQ Similar MCQ in INICET May 2026 | Dr. Zainab VoraAdded:
28-year-old male brought to the ER after being unconscious at home. And what are you having? Respiratory rate of six, decreased level of consciousness, pinpoint pupils. So, we're seeing a diffuse depression. So, yes, could be opium, could be gelsamine, which is a spinal poison and a CNS poison, could be barbiturate. It is also a CNS depressant. But then not strychnine.
Strychnine is a spinal poison, which inhibits glycine from the interneuron leading to muscle, you know, the not relaxing muscle spasticity. Do you remember T E is pre E. So, tetanus is presynaptic, strychnine is postsynaptic.
So, this is not strychnine at all. It's not a central CNS depressant.
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