Preoperative Risk and the Association between Hypotension and Postoperative Acute Kidney Injury

Michael R. Mathis; Bhiken I. Naik; Robert E. Freundlich; Amy M. Shanks; Michael Heung; Minjae Kim; Michael L. Burns; Douglas A. Colquhoun; Govind Rangrass; Allison Janda; Milo C. Engoren; Leif Saager; Kevin K. Tremper; Sachin Kheterpal

doi:10.1097/ALN.0000000000003063

Artifact Elimination Strategy	Rules/Logic
Provider marked artifacts	Marked as artifact in real time by the provider
Artifact from arterial line	SBP > 200 and PP < 50
clamping, damping, or flushing; or cuff under external pressure	SBP > 150 and SBP ≤200 and PP < 30
	SBP ≥ 100 and SBP ≤ 150 and PP < 15
	SBP < 100 and PP < 10
Artifact from arterial line or cuff transducing signal but disconnected from patient	SBP ≤ 10 or DBP ≤ 10
	SBP = DBP = MAP
	MAP < 0
	MAP ≥ 140
	If any BP is marked as artifact, then all BP
	measurements for that time will be marked
	as artifact

If artifact other than provider-marked, is detected for SBP, DBP, or MAP for a specific reading, then all three blood pressure values are marked as an artifact. BP, blood pressure; DBP, diastolic blood pressure; MAP, mean arterial pressure; PP, pulse pressure (SBP – DBP); SBP, systolic blood pressure.