in most hospitals in my country , we use normal saline or ringer if hypotetion present in preterm and wait and see
and if still hypotensive with frequent reading and suitable cuff ,,, we start dopamine if no tachycardia +/- dobutamine with low doses
and if no response we increasind the dose gradualy
but actually we didn't make ECHO for hypotesion alone
and we didn't use adrenaline for hypotesion
and in some resistant cases we use hydrocortisone dose
but in cases of IDM with hypotesion or poor perfusion we didn't add dopa or dobut. before ECHO ........