“…the decision to initiate AVP/TP was made only in children who were refractory to fluid resuscitation and conventional inotropes and all children were considered to be in an extreme state of shock). The age ranged from extremely low birthweight infants [29,34] up to a 19-year-old patient. Sixteen articles were descriptive case series [14, 17, 18, 22, 24, 26-29, 34-38, 40, 41], 10 reports were case reports [12, 13, 15, 16, 19-21, 25, 30, 33], three were clinical evaluation studies [23,32,39], one study was a non-blind randomised control trial [11] and one was a multicentre double-blind randomised control trial [31].…”