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Hemodialysis (HD) hemoconcen tration measurements may not predict hypotension, and are confounded by impaired compensatory responses to ultrafiltration (UF). We devised noninvasive photople thysmograph (PPG) technology to monitor carotid blood flow at the nasal alar, quantify cardiac and respiratory components, and study the effect of UF and resistance breathing in HD patients and blood donors.

Alar Photoplethysmography: A New Methodology for Monitoring Fluid Removal and Carotid Circulation during Hemodialysis