title: Duplex Doppler ultrasound in the diagnosis of acute renal allograft rejection.
abstract: As renal transplantation becomes more commonplace and successful, there is an increasing demand for non-invasive methods of studying possible complications. One hundred and fifty-four duplex Doppler sonography scans were performed in 38 patients within 52 days of receiving a renal allograft. Renal vascular impedance was estimated in the intrarenal arteries by calculating the resistive index ([peak systolic frequency shift--lowest diastolic frequency shift]/peak systolic frequency shift). A resistive index of greater than 0.80 was very suggestive of rejection (positive predictive value 82%); with a value of less than 0.70 rejection was unlikely (negative predictive value, 98%).
authors.affiliation: Department of Radiology, Cardiff Royal Infirmary.
authors.forename: S K
authors.initials: SK
authors.lastname: Wan
authors.forename: C J
authors.initials: CJ
authors.lastname: Ferguson
authors.forename: D L
authors.initials: DL
authors.lastname: Cochlin
authors.forename: C
authors.initials: C
authors.lastname: Evans
authors.forename: D F
authors.initials: DF
authors.lastname: Griffiths
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D005260:Female; D006084:Graft Rejection; D006801:Humans; D016030:Kidney Transplantation / Q000276:immunology*; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications / Q000175:diagnosis*; D011446:Prospective Studies; D014463:Ultrasonography