Photoplethysmography

AA Alian, KH Shelley - Best Practice & Research Clinical Anaesthesiology, 2014 - Elsevier
The photoplethysmographic (PPG) waveform, also known as the pulse oximeter waveform,
is one of the most commonly displayed clinical waveforms. First described in the 1930s, the …

Cardiac output monitoring: a contemporary assessment and review

RH Thiele, K Bartels, TJ Gan - Critical care medicine, 2015 - journals.lww.com
Objective: An increasing number of minimally or noninvasive devices are available to
measure cardiac output in the critical care setting. This article reviews the underlying …

[HTML][HTML] Inpatient respiratory arrest associated with sedative and analgesic medications: impact of continuous monitoring on patient mortality and severe morbidity

SP McGrath, KM McGovern, IM Perreard… - Journal of Patient …, 2021 - journals.lww.com
Objectives The primary study objective was to investigate the impact of surveillance
monitoring (ie, continuous monitoring optimized for deterioration detection) on mortality and …

[HTML][HTML] The effects of passive leg raising may be detected by the plethysmographic oxygen saturation signal in critically ill patients

A Beurton, JL Teboul, F Gavelli, FA Gonzalez, V Girotto… - Critical Care, 2019 - Springer
Background A passive leg raising (PLR) test is positive if the cardiac index (CI) increased
by> 10%, but it requires a direct measurement of CI. On the oxygen saturation …

[HTML][HTML] Toward accurate extraction of respiratory frequency from the photoplethysmogram: Effect of measurement site

V Hartmann, H Liu, F Chen, W Hong, S Hughes… - Frontiers in …, 2019 - frontiersin.org
Background: It is known that the respiration-modulated photoplethysmographic (PPG)
signals could be used to derive respiratory frequency (RF) and that PPG signals could be …

Estimation of individual-specific progression to impending cardiovascular instability using arterial waveforms

VA Convertino, G Grudic, J Mulligan… - Journal of Applied …, 2013 - journals.physiology.org
Trauma patients with “compensated” internal hemorrhage may not be identified with
standard medical monitors until signs of shock appear, at which point it may be difficult or too …

Running on empty? The compensatory reserve index

SL Moulton, J Mulligan, GZ Grudic… - Journal of Trauma and …, 2013 - journals.lww.com
BACKGROUND Hemorrhage is a leading cause of traumatic death. We hypothesized that
state-of-the-art feature extraction and machine learning techniques could be used to …

Individual-specific, beat-to-beat trending of significant human blood loss: the compensatory reserve

VA Convertino, JT Howard, C Hinojosa-Laborde… - Shock, 2015 - journals.lww.com
Current monitoring technologies are unable to detect early, compensatory changes that are
associated with significant blood loss. We previously introduced a novel algorithm to …

Massive transfusion prediction with inclusion of the pre-hospital Shock Index

A Olaussen, EL Peterson, B Mitra, G O'Reilly… - Injury, 2015 - Elsevier
Background Detecting occult bleeding can be challenging and may delay resuscitation. The
Shock Index (SI) defined as heart rate divided by systolic blood pressure has attracted …

Detection of low-volume blood loss: compensatory reserve versus traditional vital signs

CL Stewart, J Mulligan, GZ Grudic… - Journal of Trauma …, 2014 - journals.lww.com
BACKGROUND Humans are able to compensate for low-volume blood loss with minimal
change in traditional vital signs. We hypothesized that a novel algorithm, which analyzes …