Standardized Duplex Ultrasound-Based Protocol for Early Diagnosis of Transplant Renal Artery Stenosis: Results of a Single-Institution Retrospective Cohort Study

Table 1

Duplex Ultrasound (DU) criteria for suspicion of TRAS in the study. SPV > 2,2 m/sec was considered the landmark value for suspicion of TRAS > 50%, while a SPV > 2,8 m/sec was considered the landmark value for suspicion of TRAS > 70%, which we considered hemodynamically significant according to the available evidence (Ngo). Tardus-parvus waveform and reduced RI were considered accessory parameters that might increase the degree of suspicion in case of symptoms or altered SPV. TRAS = transplant renal artery stenosis; SPV = systolic peak velocity; RI = resistive indexes.

Direct criteria; (mandatory criterion)	SPV > 2,8 m/sec (suspicion of TRAS > 70%); (at the level of presumed stenosis)
	SPV > 2,2 m/sec (suspicion of TRAS > 50%); (at the level of presumed stenosis)
Indirect criteria; (accessory criteria)	Tardus-parvus waveform; (at parenchymal level)
	Reduce RIs (<0,8); (at parenchymal level)