OPERROR -- LTSS BTWN ACR A AND ACR B.

Narrative

I WAS WORKING ON ARR SECTOR INTO MSP. I WAS WORKING THE RADAR POS; WITH AN FPL WORKING THE ASSOCIATE POS. WE WERE NOTIFIED AN ACFT WAS INBOUND DIRECT MSP WITH A HEART ATTACK EMER. WE WERE IN A METERING HOLD; WITH DEPS COMING OUT OF APCH AIRSPACE E OF THE ARR RTE (THE BUNKR 7 ARR). DUE TO THE EMER; APCH WAS COORDINATING HDGS OF 200-210 DEGS; RATHER THAN THE LOA HDG OF 240 DEGS. ACR A CHKED ON FREQ CLBING TO 9000 FT; A SWE TURBOPROP ON A 215 DEG HDG FOR THE EMER INBOUND AND DEPARTING JET TFC. ONCE CLR OF THE DEP; I CLBED ACR A TO 16000 FT; HDG 225 DEGS SUX; DIRECT WHEN ABLE. SHORTLY THEREAFTER; ACR B (B727) CHKED ON FREQ OUT OF 9800 FT; CLBING TO 17000 FT HDG 200 DEGS. ACR B DEPARTED APCH AIRSPACE W OF ACR A. I THEN WAS BUSY CLRING THE HOLDING PATTERN AND WORKING ACFT INTO SMALLER ARPT AROUND THE SECTOR. THE ASSOCIATE CTLR POINTED OUT THAT ACR B WAS RAPIDLY OVERTAKING ACR A. I STOPPED ACR A AT 12000 FT; TOLD ACR B TO EXPEDITE THROUGH 13000 FT; AND ISSUED A L TURN TO A 160 DEG HDG. I AGAIN ASKED ACR B TO EXPEDITE. HE ADVISED CLBING AT 1500 FPM; WITH DIFFICULTY. I ASKED ACR B TO RPT LEAVING 13000 FT. WHEN HE DID; THE LATERAL SEPARATION WAS 3.5 NM. FACTORS WERE: VERY LOW CLB RATE FOR ACR B. EMER AND HOLDING IN SECTOR; AND ACR A APPEARED TO BE TRACKING CLOSER TO 240 DEGS THAN 225 DEGS. UPON QUESTIONING; ACR A ADVISED HE WAS ON A 225 DEG HDG.