2023
Using the ear photoplethysmographic waveform as an early indicator of central hypovolemia in healthy volunteers utilizing LBNP induced hypovolemia model
Eid A, Elgamal M, Gonzalez-Fiol A, Shelley K, Wu H, Alian A. Using the ear photoplethysmographic waveform as an early indicator of central hypovolemia in healthy volunteers utilizing LBNP induced hypovolemia model. Physiological Measurement 2023, 44: 055008. PMID: 37116503, DOI: 10.1088/1361-6579/acd165.Peer-Reviewed Original ResearchConceptsLower body negative pressureCentral hypovolemiaHealthy volunteersNon-invasive cardiac output monitorProgressive lower body negative pressureNoninvasive blood pressure monitorBody negative pressureCardiac output monitorBlood pressure monitorPhotoplethysmographic waveformPulse oximetry probeHypoperfusion symptomsSymptomatic subjectsHemodynamic indicesLBNP stageStroke volumeEarly predictorLT groupHypovolemiaEarly stagesPressure monitorWaveform indicesEarly indicatorWaveform morphologySymptoms
2022
10 PPG in clinical monitoring
Alian A, Shelley K. 10 PPG in clinical monitoring. 2022, 341-359. DOI: 10.1016/b978-0-12-823374-0.00006-2.Peer-Reviewed Original ResearchSympathetic nervous system activityPulsatile componentDigital signal processingNervous system activityPulse oximeter waveformPulse oximetry devicesBlood volume changesBlood pressureAutonomic functionCardiac outputLow-cost optical techniqueVascular complianceOxygen saturationSignal processingHeart rateBlood volumeClinical monitoringTherapeutic interventionsRespiratory rateMicrovascular bedPPG waveformAvailable medical devicesSystem activityPulse oximeterPhotoplethysmographic waveform