Pressure-volume relationships of finger arteries in healthy subjects and patients with coronary atherosclerosis measured non-invasively by photoelectric plethysmograpny.

Ando, Jun; Kawarada, A.; Shibata, Masahiro; Yamakoshi, Ken-ichi; Kamiya, Akira

doi:10.1253/jcj.55.567

Cited by 32 publications

(20 citation statements)

References 22 publications

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“…Blood vessels grow ever less compliant at extremes of pressure (e.g., nonlinear compliance), so plotting vascular transmural pressure versus volume yields a sigmoid-shaped curve. 39,40 Although the photoplethysmogram is not a true plethysmogram, Ando et al 41 reported that the AC signal of the photoplethysmogram versus arterial transmural pressure yields a similar sigmoid-shaped curve. Our group has been able to replicate similar curves using a plethysmogram measured over the digital artery, after signal processing to remove fluctuations in the DC baseline in a photoplethysmogram ( fig.…”

Section: The Photoplethysmogram Versus Arterial Blood Pressurementioning

confidence: 99%

Utility of the Photoplethysmogram in Circulatory Monitoring

Shaltis²,

et al. 2008

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The photoplethysmogram is a noninvasive circulatory signal related to the pulsatile volume of blood in tissue and is displayed by many pulse oximeters and bedside monitors, along with the computed arterial oxygen saturation. The photoplethysmogram is similar in appearance to an arterial blood pressure waveform. Because the former is noninvasive and nearly ubiquitous in hospitals whereas the latter requires invasive measurement, the extraction of circulatory information from the photoplethysmogram has been a popular subject of contemporary research. The photoplethysmogram is a function of the underlying circulation, but the relation is complicated by optical, biomechanical, and physiologic covariates that affect the appearance of the photoplethysmogram. Overall, the photoplethysmogram provides a wealth of circulatory information, but its complex etiology may be a limitation in some novel applications.

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Section: The Photoplethysmogram Versus Arterial Blood Pressurementioning

confidence: 99%

Utility of the Photoplethysmogram in Circulatory Monitoring

Shaltis²,

et al. 2008

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“…A full arterial elastance curve is then constructed on the basis of these 12 values. The elastance determined in the study, a local index of arterial stiffness, is totally different from that measured from an arterial segment [6][7][8] or the whole arterial system [13].…”

Section: Discussionmentioning

confidence: 85%

“…Thus, it is important to perform an early detection of the arterial stiffness using a reliable method. To date, there have been different technologies for directly or indirectly assessing the arterial stiffness, including the ultrasound echotracking (Doppler) [5], analysis of pulse transit time [6], impedance plethysomgraphy [7], photo-plethysmography [8], oscillometry [9], tonometry [10], and analysis of pressure waveform [11].…”

Section: Introductionmentioning

confidence: 99%

Regional Cold Stress Leads to an Upforward Shift in the Whole Elastance Curve of Arterial Wall

Wang

Chang

Liu

2010

2010 4th International Conference on Bioinformatics and Biomedical Engineering

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The purpose of this study was to assess the timedependent elastance of the radial arterial wall using a sinusoidal vibration method in room temperature and cold stress conditions. When a tiny sinusoidal displacement with varying frequencies is imposed on the superficial radial artery, its wall elastance can be derived from the reactive force of the wall, and the amplitude and frequency of the small displacement. The results showed in 20 healthy subjects that the 5-min cold stress with 4℃ ice bags significantly increased the dynamic range of the radial wall elastance from 6.3±2.3 ×10 4 dyne/cm (at room temperature) to 9.2±3.7 ×10 4 dyne/cm (p<0.05). In addition, peak elastance of the radial wall became significantly greater in the cold stress (5.82±2.24 ×10 5 dyne/cm) than at room temperature (3.86±1.26 ×10 5 dyne/cm) (p<0.001). In summary, constriction of the radial artery in response to an external cold stress may lead to an up forward shift in the time-varying wall elastance curve.

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“…Using the first derivative, the stiffness index (SI) was calculated. PPG signal usually exhibits an early systolic peak and a later peak or point of inflection that occurs a short time ( t) after the first peak in early diastole [5]. The first peak is formed mainly by pressure transmitted along a direct path from the left ventricle to the finger (where it generates a change in blood volume).…”

Section: Methodsmentioning

confidence: 99%

A computer based photoplethysmographic vascular analyzer through derivatives

Gonzalez

Manzo

Delgado

et al. 2008

2008 Computers in Cardiology

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A computer based photoplethysmographic analyzer was developed. The signal was obtained by infrared light through the finger. It was converted into digital domain by a signal processing circuitry. First, second and fourth derivatives of the signal were computed. The acquisition and mathematical processing programs were implemented in object-oriented programming C. A study with 38 people, 19 healthy volunteers and 19 subjects with previously diagnosed cardiovascular disease (atherosclerosis, hypertension, diabetes mellitus) was carried out. A t-tested distribution between healthy volunteers and patients showed a significant differences in calculated parameters. Photoplethysmographic augmentation index has shown to be a noninvasive parameter for vascular assessments. Using derivatives, the inflection points identification of the digital volume pulse is simpler and more accurate.

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Pressure-volume relationships of finger arteries in healthy subjects and patients with coronary atherosclerosis measured non-invasively by photoelectric plethysmograpny.

Cited by 32 publications

References 22 publications

Utility of the Photoplethysmogram in Circulatory Monitoring

Utility of the Photoplethysmogram in Circulatory Monitoring

Regional Cold Stress Leads to an Upforward Shift in the Whole Elastance Curve of Arterial Wall

A computer based photoplethysmographic vascular analyzer through derivatives

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