Table 1.

The search terms and exact results in PubMed database.

Database	#	Search strategy	Results
PubMed	1	“natriuretic peptide, brain”[MeSH Terms]	15,708
	2	“brain”[Title/Abstract] OR “pro brain”[Title/Abstract] OR “pro b type”[Title/Abstract] OR “b type”[Title/Abstract] OR “type b”[Title/Abstract] OR “ventricular”[Title/Abstract]	1,487,342
	3	“natriuretic peptide*”[Title/Abstract]	33,584
	4	#2 and #3	22,403
	5	“nt bnp”[Title/Abstract] OR “n bnp”[Title/Abstract] OR “ntprobnp”[Title/Abstract] OR “nt probnp”[Title/Abstract] OR “pro bnp*”[Title/Abstract] OR “probnp*”[Title/Abstract] OR “bnp”[Title/Abstract]	18,739
	6	“natriuretic factor”[Title/Abstract]	4,464
	7	#1 or #4 or #5 or #6	34,067
	8	“kidney diseases”[MeSH Terms]	548,322
	9	“nephropathy”[Title/Abstract] OR “kidney diseases”[Title/Abstract] OR “kidney disease”[Title/Abstract]	153,768
	10	“acute kidney injury”[MeSH Terms]	51,927
	11	“renal diseases”[Title/Abstract] OR “renal disease”[Title/Abstract] OR “acute renal failure”[Title/Abstract] OR “acute kidney failure”[Title/Abstract] OR “acute kidney insufficiency”[Title/Abstract] OR “acute renal insufficiency”[Title/Abstract] OR “acute renal injury”[Title/Abstract] OR “acute kidney injury”[Title/Abstract]	126,171
	12	#8 OR #9 OR #10 OR #11	630,424
	13	“contrast media”[MeSH Terms]	93,039
	14	“radiopaque”[Title/Abstract] OR “radiocontrast”[Title/Abstract] OR “contrast agent”[Title/Abstract] OR “contrast material”[Title/Abstract] OR “contrast medium”[Title/Abstract] OR “contrast media”[Title/Abstract] OR “contrast”[Title/Abstract]	1,083,897
	15	#13 OR #14	111,632
	16	#12 AND #15	26,903
	17	“CI AKI”[Title/Abstract] OR “CIN”[Title/Abstract]	11,924
	18	#16 OR #17	36,910
	19	#7 AND #18	136