If the pt is an inpt, there should be an H&P on the chart. Does your hospital have a form where the Rad. can just check "no change " from the initial H&P, if the procedure is being done more than 30 days from it?
Agree w/nesher, check your policy. IV meds, esp when titrated during a procedure, ARE moderate (or "conscious") sedation. We were even monitored for the H&P from ER, for traumas (just reminded to check and be sure one is in the chart before we began the stat procedure we'd been called in for!)!!
If the pt is an out-pt, either the Rad. will have to do the H&P or delegate it to the ordering MD (to be done while the pt is in his/her office, when he/she orders the procedure).
Or you could have the clinic/MD's office fax the last visit, hoping it contains all that is required for the H&P (which is iffy). Perhaps you could develop a pre-sedation H&P form, with check boxes or charting by exception, or something that covers the requisite areas -- don't need a 6-pager. Quick and dirty (but accurate! again, check your policy).
Or you could schedule the pts to come in to the Rad Dept within a month of the procdure, for the Rads to do a brief H&P.
Our Rads filled out the ASA form, which is appropriate since they'll be the ones ordering the meds for the sedation.
It took us a lot of reminding and inservice and cooperation from the Rads to reinforce what was needed, in order to facilitate changes in the ordering doc's habits.
Wouldn't a dept PA be a blessing in this circumstance???!!