Grade 4 Neonatal Tachyarrhythmia, AE

**Semantic type:** Finding

**Definition:** A tachyarrhythmia adverse event in a newborn characterized by life-threatening consequences (e.g. shock); requiring urgent major care changes.

**Synonyms:** - Grade 4 Neonatal Tachyarrhythmia - Grade 4 Neonatal Tachyarrhythmia, Adverse Event