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Arteriolar Elasticity Measurement in the Fingertip Based on Photoplethysmographic Volume-Oscillometry: A New Approach to the Assessment of Vasomotor Functions in the Microvasculature.
Cardiovasc Eng Technol
January 2025
Department of Research and Development, Nonprofit Organization of Research Institute of Life Benefit, Sapporo, Hokkaido, 005-0006, Japan.
Purpose: Dysfunction of vasomotor reactions due to arteriolar smooth muscle causes serious adverse events, such as loss of hemodynamic coherence. This in turn can increase risks of cardiovascular-related diseases. A noninvasive and quantitative evaluation of microvascular disorder is therefore very important for early diagnosis and treatment.
View Article and Find Full Text PDFRelationship Between Finger Photoplethysmographic Pulses and Skin Blood Perfusion.
Cureus
October 2024
Medical Education, Nova Southeastern University Dr. Kiran C. Patel College of Allopathic Medicine, Davie, USA.
Introduction Photoplethysmography (PPG) measures are important in monitoring peripheral oxygen saturation (SpO). Another parameter is a derived quantity referred to as the peripheral perfusion index (PPI). It is calculated as the ratio of the peak-to-peak pulse amplitude of a PPG signal (PA) to the non-pulsating part of the total PPG signal.
View Article and Find Full Text PDFEffects of trigeminal neurostimulation on heart rate variability: comparing cutaneous (Tragus) and tongue (Antero-Dorsal mucosa) stimulation.
BMC Oral Health
October 2024
Departement of Clinical Medicine, Public Health, Life and Environmental Sciences, University of L'Aquila, Piazzale Salvatore Tommasi 11, L'Aquila, 67100, Italy.
Background: Trigeminal neurostimulation of the dorsal anterior mucosal surface of the tongue has been proposed to treat a variety of pathologies and to promote neuro-muscular coordination and rehabilitation. Dental ULFTENS can also be considered a form of trigeminal neurostimulation applied to the skin surface bilaterally at the level of the tragus. It has been used for years in dentistry for practical and diagnostic purposes.
View Article and Find Full Text PDFFrequency-Domain Features and Low-Frequency Synchronization of Photoplethysmographic Waveform Variability and Heart Rate Variability with Increasing Severity of Cardiovascular Diseases.
Biomedicines
September 2024
Institute of Cardiology Research, Saratov State Medical University, Saratov 410012, Russia.
-Heart rate variability (HRV) and photoplethysmographic waveform variability (PPGV) are available approaches for assessing the state of cardiovascular autonomic regulation. The goal of our study was to compare the frequency-domain features and low-frequency (LF) synchronization of the PPGV and HRV with increasing severity of cardiovascular diseases. -Our study included 998 electrocardiogram (ECG) and finger photoplethysmogram (PPG) recordings from subjects, classified into five categories: 53 recordings from healthy subjects, aged 28.
View Article and Find Full Text PDFTesting preload responsiveness by the tidal volume challenge assessed by the photoplethysmographic perfusion index.
Crit Care
September 2024
AP-HP, Service de médecine intensive-réanimation, Hôpital de Bicêtre, DMU 4 CORREVE, Inserm UMR S_999, FHU SEPSIS, CARMAS, Université Paris-Saclay, 78 rue du Général Leclerc, 94270, Le Kremlin-Bicêtre, France.
Background: To detect preload responsiveness in patients ventilated with a tidal volume (Vt) at 6 mL/kg of predicted body weight (PBW), the Vt-challenge consists in increasing Vt from 6 to 8 mL/kg PBW and measuring the increase in pulse pressure variation (PPV). However, this requires an arterial catheter. The perfusion index (PI), which reflects the amplitude of the photoplethysmographic signal, may reflect stroke volume and its respiratory variation (pleth variability index, PVI) may estimate PPV.
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