Continuous cuffless blood pressure monitoring based on PTT

Shriram, Revati; Wakankar, Asmita; Daimiwal, Nivedita; Ramdasi, Dipali

doi:10.1109/icbbt.2010.5479013

Cited by 47 publications

(14 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Shriram et al 20 have also examined using the PTT method as a means to estimate BP. Shriram used the Moens-Korteweg equation directly, the same as what has been described here in relation to Figure 4.…”

Section: Discussionmentioning

confidence: 99%

An examination of calibration intervals required for accurately tracking blood pressure using pulse transit time algorithms

et al. 2013

View full text Add to dashboard Cite

Pulse transit time (PTT) is defined as the time it takes the blood pressure (BP) wave to propagate from the heart to a specified point on the body. After an initial BP measurement, PTT can track BP over short periods of time. This paper evaluates two PTT algorithms: Chen's and Poon's algorithm; two of the most cited works in the area. The criteria for evaluating them were: which was capable of best tracking changes in BP and which provided the longest time between subsequent BP measurements. These establish the suitability of the PTT method for practical applications, which has not been examined previously. Accuracy was evaluated using the Association of Advancement of Medical Instrumentation (AAMI) and the British Hypertension Society's (BHS) standards. Results show that Chen's algorithm is dependent on its lookup table at short intervals but remains accurate using a 6-min calibration interval, with r ¼ 0.96 and r 2 ¼ 0.98. Poon's algorithm fails when using a 2-min calibration interval, but is more capable of reflecting changes in BP. The short calibration interval and accuracy limit the usefulness of calculating BP using PTT. Therefore, neither of the algorithms can be recommended because of their shortcomings when estimating BP.

show abstract

Section: Discussionmentioning

confidence: 99%

An examination of calibration intervals required for accurately tracking blood pressure using pulse transit time algorithms

et al. 2013

View full text Add to dashboard Cite

show abstract

“…However, this method was also only designed to get blood pressure. There are many other researches on the blood pressure acquiring [5][6][7][8]. These methods are also only designed for blood pressure acquiring at the same time.…”

Section: Introductionmentioning

confidence: 98%

An implantable radio-telemetry system for detecting multiple bio-parameters of a small animal based on wireless energy transmission

et al. 2015

View full text Add to dashboard Cite

“…Continuous beat-to-beat measurements of BP obtained by the computation of the PTT from electrocardiography (ECG) and peripheral PPG signals however, are disputable for several reasons: (i) the dependency on the location and the distance of measurement points, (ii) the method used to find and interpret minima, maxima and saddle points within the PPG and ECG signals [5,6], (iii) the appearance of undetermined fluctuations in the time between the pressure wave and the ECG R-peak during blood ejection of the left ventricle [7] and (iv) the influences of auto-regulation on arterial stiffness that produce undetermined drifts of the PTT over time [8]. Nonetheless, the PTT method is subject of several publications that aim at a development of wearable continuous BPM devices [5,[9][10][11][12][13]. As PTT-based methods compute the BP by employing its correlation with the actual pulse wave velocity (PWV), the particular drawback of this approach is that PWV depends on the elasticity of the tested artery section, which in turn is considerably affected by a variety of physiological mechanisms of BP regulation.…”

Section: Introductionmentioning

confidence: 99%

Estimation of Quasi-Continuous Blood Pressure based on Harmonic Phase-Shifts in Signals using Non-Invasive Photoplethysmographic Measurements

Kern

Bernhard

2019

Preprint

View full text Add to dashboard Cite

According to the guidelines of the European Society of Hypertension International Protocol revision 2010, the requirements for long time blood pressure measurement (BPM) are: simple handling, robustness against movements, accuracy of better than 5 mmHg, and, above all, that the patient's motion should not be restricted during measurement. These requirements are in particular important for a reliable interpretation of the blood pressure (BP) of hypertensive patients, because such a diagnosis will usually be confirmed by long-term measurement. Moreover, to be able to correlate the patient's BP with his normal daily activity, non-obstructive non-invasive methods are desired to reduce the patient's load. The main concern of this paper is to present a novel method for estimating non-invasive continuous blood pressure (CBP) from a single photoplethysmography (PPG) signal. In contrast to the pulse transit time (PTT) method, our approach is based on the assumption that the phase-velocities of the fundamental and higher harmonics depend on the (non-linear) elastic properties of the arteries. Consequently, phase velocity varies as a function of a vessel's instantaneous dilation and can be effectively utilised for CBP estimation. In addition to its numerous advantages for a simplified measurement setup, we could show that the method achieves a high degree of correlation for a reliable BP estimation from PPG data. Comparison with state-of-the-art PTT methods was carried out using a dataset from the PhysioBank Database comprising a reference invasive blood pressure (IBP) signal measured at the radial artery, a PPG signal measured at the fingertip and a standard ECG signal. The correlation values obtained from the long-time estimation of the systolic blood pressure (SBP) were as high as r = 0.8945, while the value for the diastolic blood pressure (DBP) was found to be r = 0.9082 and the correlation of the mean blood pressure (MBP) was r = 0.9322. These results were achieved by analysing the dataset in a beat-to-beat manner and regarding several post-processing procedures like coherent averaging (CA) and zero padding with quasi-continuous frequency domain estimation and artificially refined frequency resolution.

show abstract

Continuous cuffless blood pressure monitoring based on PTT

Cited by 47 publications

References 4 publications

An examination of calibration intervals required for accurately tracking blood pressure using pulse transit time algorithms

An examination of calibration intervals required for accurately tracking blood pressure using pulse transit time algorithms

An implantable radio-telemetry system for detecting multiple bio-parameters of a small animal based on wireless energy transmission

Estimation of Quasi-Continuous Blood Pressure based on Harmonic Phase-Shifts in Signals using Non-Invasive Photoplethysmographic Measurements

Contact Info

Product

Resources

About