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Glossary of technical terms

hypotonic-hyporesponsive episode (shock, collapse)

The sudden onset of:

  • pallor or cyanosis
  • limpness (muscle hypotonia)
  • reduced responsiveness or unresponsiveness

This may occur after vaccination when no other cause is evident, such as a vasovagal episode or anaphylaxis. The episode usually occurs 1–48 hours after vaccination and gets better on its own without treatment.

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https://immunisationhandbook.health.gov.au/technical-terms/hypotonic-hyporesponsive-episode-shock-collapse
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