Takuo Aoyagi—a Tribute to the Brain Behind Pulse Oximetry

Bhattacharya, Kaushik

doi:10.1007/s12262-020-02365-x

Cited by 6 publications

(3 citation statements)

References 2 publications

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“…In Japan, Takuo Aoyagi, a Japanese bioengineer, pioneered the work that in 1974 led to the invention of the pulse oximeter ( 8 ). This noninvasive device, which enables determination of the oxygen saturation of the blood (the fifth vital sign), is credited as being the greatest advance for monitoring acutely ill patients, as has been the case in the management of millions of patients during the current severe acute respiratory syndrome coronavirus 2 (SARS-COV-2) (coronavirus disease [COVID-19]) pandemic.…”

Section: The Pulse Oximeter: Real-time Recording Of the Fuel Of Lifementioning

confidence: 99%

From Laënnec’s Stethoscope to the Magic of Imaging, Big Data and Artificial Intelligence: A Timeline of Precision Medicine for Patients with Chronic Obstructive Pulmonary Disease

Celli

2023

Am J Respir Crit Care Med

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Section: The Pulse Oximeter: Real-time Recording Of the Fuel Of Lifementioning

confidence: 99%

From Laënnec’s Stethoscope to the Magic of Imaging, Big Data and Artificial Intelligence: A Timeline of Precision Medicine for Patients with Chronic Obstructive Pulmonary Disease

Celli

2023

Am J Respir Crit Care Med

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“…Pulse oximetry was invented in 1974 by bioengineer Takuo Aoyagi [21]. It is a non-invasive and useful technology for monitoring the functional oxygen saturation of hemoglobin in arterial blood (SaO 2 ).…”

Section: Pulse Oximetrymentioning

confidence: 99%

Pulse Oximetry Based on Quadrature Multiplexing of the Amplitude Modulated Photoplethysmographic Signals

Koseeyaporn

Wardkein

Sinchai

et al. 2023

Sensors

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In this research, a pulse oximeter based on quadrature multiplexing of AM-PPG signals is proposed. The oximeter is operated by a microcontroller and employs a simple amplitude modulation technique to mitigate noise interference during SpO2 measurement. The two AM-PPG signals (RED and IR) are quadrature multiplexed using carrier signals with equal frequencies but a 90-degree phase difference. The study focused on noise interference caused by light intensity and hand movement. The experiment was conducted under three different levels of light intensity: 200 Lux, 950 Lux, and 2200 Lux. For each light intensity level, the SpO2 level was measured under three scenarios: hand still, shadow movement over the hand, and hand shaking. A comparison between the proposed technique and the conventional method reveals that the proposed technique offers a superior performance. The relative error of the measured SpO2 level using the proposed technique was less than 3.1% overall. Based on the study, the proposed technique is less affected by noise interference caused by light intensity and hand movement compared to the conventional method. In addition, the proposed technique has an advantage over contemporary methods in terms of computational complexity. Consequently, the proposed technique can be applied to wearable devices that include SpO2 measurement functionality.

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“…The precision of the pulse oximeter is affected because of use of acrylic nail paints, strong ambient light, low perfusion states as hypothermia, low cardiac output, anemia, carboxyhemoglobinemia, methmoglobinemia, and intravenous dyes can also give false SpO 2 readings. [ 4 ]…”

Section: Introductionmentioning

confidence: 99%

Assessing the SpO2 in a random population – Looking for the best among fingers

Agrawal

Pursnani

Gautam

et al. 2022

Journal of Family Medicine and Primary Care

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Context: Pulse oximetry is one of the most revolutionary methods used to monitor the patients in the clinical setting, particularly intensive care and anesthesia. We usually use the index or middle finger to measure SpO 2 values, but little is known about the inter-digital differences that exist between the fingers. Aim: We aim to compare the peripheral capillary oxygen saturation among fingers of both hands. A total of 93 healthy volunteers aged between 18 and 50 years participated in the study. Materials and Methods: Their SpO 2 values were recorded from each finger with at least 1 minute of resting interval. Their blood pressure, heart rate, and body temperature were recorded as well. Result: A total of 930 measurements were obtained from 93 volunteers. The highest average SpO 2 value of right-handed volunteers was measured from the left little finger (98.48 ± 0.62) of right-handed volunteers, and it was statistically significant when compared with the right ring finger, right little finger, left thumb, left index, left middle finger, and left ring finger. The highest average SpO 2 from left-handed volunteers was obtained from the right index finger, but it was statistically insignificant. Conclusion: We assume ethnic and climatic differences to play a role in contradictory results noted from previous studies conducted, and this needs to be investigated further. It is recommended that multiple readings may be obtained from other fingers as well before coming to any conclusion as inter-finger variability cannot be ignored.

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Takuo Aoyagi—a Tribute to the Brain Behind Pulse Oximetry

Cited by 6 publications

References 2 publications

From Laënnec’s Stethoscope to the Magic of Imaging, Big Data and Artificial Intelligence: A Timeline of Precision Medicine for Patients with Chronic Obstructive Pulmonary Disease

From Laënnec’s Stethoscope to the Magic of Imaging, Big Data and Artificial Intelligence: A Timeline of Precision Medicine for Patients with Chronic Obstructive Pulmonary Disease

Pulse Oximetry Based on Quadrature Multiplexing of the Amplitude Modulated Photoplethysmographic Signals

Assessing the SpO2 in a random population – Looking for the best among fingers

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