Efficacy of the Use of Vasopressin as a Primary Vasoconstrictor in Critically Ill Patients

The group (arm 1) where vasopressin (1 amp in 50 mlN/S) (1st vasoconstrictor) will be administered first up to a maximum dose of 0.03 IU/min (2.3 ml/h) for the treatment of hemodynamic instability. Then, if the patient remains unstable, noradrenaline (2nd vasoconstrictor) will be started. The dose of vasopressin will not be increased further than the above mentioned limit.

ii. In the group (arm 2) where the treatment of haemodynamic instability will be performed by first administering noradrenaline (1st vasoconstrictor) up to 0,5 mcg/kg/min and then, if the patient is still unstable, adding vasopressin (2nd vasoconstrictor) at a maximum dose of 0.03 IU/min (2.3ml/h). If haemodynamic instability persists, treatment will involve further increase of the noradrenaline dose.