You will be shown an abstract from a biomedical research paper. Given this abstract, your task is to extract all unique entities of the following types: ["Outcome", "Participant", "Intervention"].

Please return the output as a JSON object of the format: {"Participant" : ["patients with COPD", ...], "Intervention" : ["Atenolol", ...], "Outcome" : ["blood pressure", ...]}. The keys should be entity types and values should be lists of extracted entities belonging to the corresponding type. If you cannot find entities belonging to a specific type, the value should be [].

Only output the JSON object and do not include any additional text.

Abstract:

[ No better vigilance after general anesthesia with propofol in colonic surgery . A comparison of three procedures for general anesthesia ( propofol , halothane and midazolam/fentanyl ) in combination with catheter epidural anesthesia ] . Early mental and psychomotor recovery was studied in 67 patients undergoing colorectal surgery under continuous epidural anaesthesia and light general anaesthesia using propofol , halothane , and midazolam/fentanyl . The study was approved by the local ethics committee . All patients received epidural anaesthesia with 0.25 % bupivacaine and were then randomly allocated to one of three groups . In group I ( halothane ) , light general anaesthesia was induced with thiopental 3-5 mg/kg and maintained with halothane . The propofol group ( II ) received 2 mg/kg for induction and a mean continuous infusion of 1.7 mg/kg.h . In group III ( Mi/Fe ) , midazolam and fentanyl were used for induction and maintenance . All patients were intubated , received non-depolarising muscle relaxants , and were manually ventilated with nitrous oxide-oxygen ( 2:1.2 ) . For postoperative analgesia , 0.05 mg/kg morphine was administrated epidurally 30 min before the end of the operation ; 30 , 60 , 90 , and 120 min after arriving in the recovery room , vigilance was assessed using a modified Steward score , the Trieger test , the ability to recall a column of numbers ( KAI test ) , and symbol counting ( CI test ) . Heart rate , blood pressure , arterial oxygen saturation , and blood gases were recorded . RESULTS . The three groups were comparable with regard to age , sex , ASA classification , and duration of anaesthesia and operation ( Table 3 ) . There was no difference between the groups in performance of the recovery tests ( Figs . 2-5 ) , blood pressure , heart rate , arterial blood gas analysis ( Fig . 6 ) , or oxygen saturation . Comparing pre- and postoperative values , we found severe psychomotor and mental impairment in all groups . pCO2 was slightly elevated in all groups , but only 3 patients in the propofol group and 6 in the midazolam/fentanyl group developed hypercapnia above 50 mm Hg . Patients receiving propofol or midazolam/fentanyl had significantly less postoperative nausea and vomiting than those receiving halothane ( Table 5 ) . CONCLUSION . It is concluded that propofol offers no advantage over halothane or midazolam/fentanyl where early postoperative recovery is concerned . Intraoperatively , all three techniques provided good anaesthesia . Propofol and midazolam/fentanyl caused less postoperative nausea and vomiting than halothane anaesthesia .
{"Intervention": ["manually ventilated with nitrous oxide-oxygen", "midazolam and fentanyl", "( halothane ) , light general anaesthesia", "epidural anaesthesia", "intubated", "propofol", "halothane", "continuous epidural anaesthesia", "non-depolarising muscle relaxants", "epidurally", "thiopental 3-5 mg/kg and maintained with halothane", "propofol in", "bupivacaine", "Propofol", "midazolam/fentanyl", "morphine", "general anesthesia", "and light general anaesthesia"], "Outcome": ["recovery tests", "hypercapnia", "Heart rate , blood pressure , arterial oxygen saturation , and blood gases", "vigilance", "pCO2", "postoperative recovery", "Early mental", "psychomotor recovery", "postoperative nausea and vomiting", "psychomotor and mental impairment", "blood pressure , heart rate , arterial blood gas analysis ( Fig . 6 ) , or oxygen saturation ."], "Participant": ["continuous epidural anaesthesia", "colorectal surgery", "light general anaesthesia", "67"]}