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: ["Disease", "Chemical"].

Please return the output as a JSON object of the format: {"Chemical" : ["Naloxone", ...], "Disease" : ["Hypotensive", ...]}. 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:

Protective effect of misoprostol on indomethacin induced renal dysfunction in elderly patients. OBJECTIVE: To evaluate the possible protective effects of misoprostol on renal function in hospitalized elderly patients treated with indomethacin. METHODS: Forty-five hospitalized elderly patients (> 65 years old) who required therapy with nonsteroidal antiinflammatory drugs (NSAID) were randomly assigned to receive either indomethacin, 150 mg/day (Group A), or indomethacin 150 mg/day plus misoprostol at 0.6 mg/day (Group B). Laboratory variables of renal function [serum creatinine, blood urea nitrogen (BUN) and electrolytes] were evaluated before initiation of therapy and every 2 days, until termination of the study (a period of at least 6 days). Response to treatment was estimated by the visual analog scale for severity of pain. RESULTS: Forty-two patients completed the study, 22 in Group A and 20 in Group B. BUN and creatinine increased by > 50% of baseline levels in 54 and 45% of Group A patients, respectively, compared to only 20 and 10% of Group B patients (p < 0.05). Potassium (K) increment of 0.6 mEq/l or more was observed in 50% of Group A, but in only 15% of Group B patients (p < 0.05). The mean increments in BUN, creatinine, and K were reduced by 63, 80, and 42%, respectively, in Group B patients compared to Group A. Response to treatment did not differ significantly between the 2 groups. CONCLUSION: Hospitalized elderly patients are at risk for developing indomethacin related renal dysfunction. Addition of misoprostol can minimize this renal impairment without affecting pain control.
{"Chemical": ["K", "creatinine", "Potassium", "blood urea nitrogen", "BUN", "indomethacin", "misoprostol"], "Disease": ["pain", "renal impairment", "renal dysfunction"]}