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Noninvasive investigation of blood pressure changes using the pulse wave transit time: a novel approach in the monitoring of hemodialysis patients
The results indicate that large sudden pressure drops, like those seen in sudden hypovolemia, can be detected in dialysis patients and are correlated to systolic blood pressure within the acceptable range for a trend-indicating system. Expand
Neural network for photoplethysmographic respiratory rate monitoring
  • A. Johansson
  • Computer Science, Medicine
  • Medical and Biological Engineering and Computing
  • 1 May 2003
Results suggest the use of a combined PPG system for simultaneous monitoring of respiratory rate and arterial oxygen saturation (pulse oximetry) and a neural network was assessed in a combined pattern recognition approach. Expand
Respiratory variations in the reflection mode photoplethysmographic signal. Relationships to peripheral venous pressure
Although respiratory-induced variations in PVP and PPG showed a close correlation in amplitude variation, a causal relationship between the signals could not be demonstrated and it was hypothesised that the filling of peripheral veins is one of the important factors involved. Expand
Monitoring of respiratory rate in postoperative care using a new photoplethysmographic technique
The results indicate that PPG has the potential to be useful for monitoring respiratory rate in the postoperative period, and compares it with the established technique, transthoracic impedance. Expand
Combined photoplethysmographic monitoring of respiration rate and pulse: a comparison between different measurement sites in spontaneously breathing subjects
The aim was to investigate PPG signals recorded from different skin sites in order to find suitable locations for parallel monitoring of variations synchronous with heartbeat and breathing. Expand
Pulse wave transit time for monitoring respiration rate
The beat-to-beat respiratory fluctuations in pulse wave transit time and its subcomponents, the cardiac pre-ejection period (PEP) and the vessel transit time (VTT) in ten healthy subjects found to fluctuate in pace with respiration. Expand
Monitoring of Heart and Respiratory Rates in Newborn Infants Using a New Photoplethysmographic Technique
During periods of highquality ECG and impedance signals, the new optical device produces signals of equal quality to these traditional methods, and is in some cases even better. Expand
Chaotic dynamics of respiratory sounds
There is a growing interest in nonlinear analysis of respiratory sounds (RS), but little has been done to justify the use of nonlinear tools on such data. The aim of this paper is to investigate theExpand
Estimation of respiratory volumes from the photoplethysmographic signal. Part I: experimental results
To evaluate the possibility of respiratory-volume measurement using photoplethysmography (PPG), PPG signals from 16 normal volunteers are collected, and the respiratory-induced intensity variations (RIIV) are digitally extracted, finding that the amplitude of the RIIV signal is related to the respiratory volume. Expand
Respiration can be monitored by photoplethysmography with high sensitivity and specificity regardless of anaesthesia and ventilatory mode
It is evaluated if anaesthesia and positive‐pressure ventilation would affect PPGr, a non‐invasive optical technique used, for instance, in pulse oximetry, which has a respiratory synchronous variation (PPGr). Expand