2014
Analysis of plethysmographic waveform changes induced by beach chair positioning under general anesthesia
Zhu R, Atteya G, Shelley KH, Silverman DG, Alian AA. Analysis of plethysmographic waveform changes induced by beach chair positioning under general anesthesia. Journal Of Clinical Monitoring And Computing 2014, 28: 591-596. PMID: 24420341, DOI: 10.1007/s10877-014-9555-9.Peer-Reviewed Original ResearchConceptsBeach chair positioningVasoactive drugsBlood pressureShoulder surgeryNoninvasive hemodynamic parametersPostoperative cerebral ischemiaMean arterial pressureTidal carbon dioxideBeach chair positionIntermittent blood pressureChair positionWilcoxon signed-rank testPosition surgeryArterial pressureCerebral ischemiaGeneral anesthesiaSigned-rank testHemodynamic parametersRare caseDevastating outcomesHeart rateRespiratory frequencyPatientsSurgeryAmplitude density
2012
Using Time-Frequency Analysis of the Photoplethysmographic Waveform to Detect the Withdrawal of 900 mL of Blood
Scully CG, Selvaraj N, Romberg FW, Wardhan R, Ryan J, Florian JP, Silverman DG, Shelley KH, Chon KH. Using Time-Frequency Analysis of the Photoplethysmographic Waveform to Detect the Withdrawal of 900 mL of Blood. Anesthesia & Analgesia 2012, 115: 74-81. PMID: 22543068, DOI: 10.1213/ane.0b013e318256486c.Peer-Reviewed Original ResearchMeSH KeywordsAdultBlood PressureBlood Pressure DeterminationBlood Transfusion, AutologousBlood VolumeBlood Volume DeterminationCluster AnalysisConnecticutElectrocardiographyHeart RateHumansHypovolemiaInfrared RaysMalePhotoplethysmographyPredictive Value of TestsRespiratory MechanicsSensitivity and SpecificitySignal Processing, Computer-AssistedTime FactorsConceptsML of bloodArterial blood pressureBlood lossBlood pressureHeart rateHeart rate frequencyBlood withdrawalML blood lossMean percent decreaseBlood volume lossHeart rate componentSignificant changesPhotoplethysmographic waveformSpontaneous breathingTrauma settingCuff measurementsPPG waveformBlood reinfusionHealthy volunteersStandard electrocardiogramBloodEarly detectionEar PPG signalsBaselineConfidence intervals