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Hypotension — usually transient and corrects in supine position
Loss of consciousness — improves once supine or in head-down position
Tachycardia
Weak/absent carotid pulse
Hypotension — sustained and no improvement without specific treatment (Note: In infants and young children, limpness and pallor are signs of hypotension)
Loss of consciousness — no improvement once supine or in head-down position
Skin symptoms or signs
Generalised pallor
Cool, clammy skin
Pruritus (skin itchiness)
Generalised skin erythema (redness)
Urticaria (weals)
Angioedema (localised or general swelling of the deeper layers of the skin or subcutaneous tissues)
Gastrointestinal symptoms or signs
Nausea or vomiting
Abdominal cramps
Diarrhoea
Nausea or vomiting
Neurologic symptoms or signs
Person feels faint or light-headed
Person has a sense of severe anxiety and distress
Note: Anaphylaxis features are modified from The Brighton Collaboration Case Definition Criteria for Anaphylaxis.5 Neurologic symptoms are not listed in this case definition.5 However, symptoms of anxiety and distress, including feelings of impending doom, are reported in people experiencing anaphylaxis.6
Printed content may be out of date. For up to date information, always refer to the digital version: https://immunisationhandbook.health.gov.au/resources/handbook-tables/table-clinical-features-that-may-help-differentiate-between-a-vasovagal.