scholarly journals An Alignment-Free Sensing Module for Noninvasive Radial Artery Blood Pressure Measurement

Electronics ◽  
2021 ◽  
Vol 10 (23) ◽  
pp. 2896
Author(s):  
Binpeng Zhan ◽  
Chao Yang ◽  
Fuyuan Xie ◽  
Liang Hu ◽  
Weiting Liu ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Standard Deviation ◽  
Blood Pressure Measurement ◽  
Complementary Method ◽  
Mean Error ◽  
Alignment Free ◽  
Arterial Tonometry ◽  
Flexible Film ◽  
The Mean ◽  
Solid Liquid

Sensor–artery alignment has always been a significant problem in arterial tonometry devices and prevents their application to wearable continuous blood pressure (BP) monitoring. Traditional solutions are to use a complex servo system to search for the best measurement position or to use an inefficient pressure sensor array. In this study, a novel solid–liquid mixture pressure sensing module is proposed. A flexible film with unique liquid-filled structures greatly reduces the pulse measurement error caused by sensor misplacement. The ideal measuring location was defined as −2.5 to 2.5 mm from the center of the module and the pressure variation was within 5.4%, which is available in the real application. Even at a distance of ±4 mm from the module center, the pressure decays by 23.7%, and its dynamic waveform is maintained. In addition, the sensing module is also endowed with the capability of measuring the pulse wave transmit time as a complementary method for BP measuring. The capability of the developed alignment-free sensing module in BP measurement was been validated. Twenty subjects were selected for the BP measurement experiment, which followed IEEE standards. The experimental results showed that the mean error of SBP is −4.26 mmHg with a standard deviation of 7.0 mmHg, and the mean error of DBP is 2.98 mmHg with a standard deviation of 5.07 mmHg. The device is expected to provide a new solution for wearable continuous BP monitoring.

scholarly journals Validation of Blood Pressure Measurement Using a Smartwatch in Patients With Parkinson's Disease

2021 ◽  
Vol 12 ◽  
Author(s):  
Jong Hyeon Ahn ◽  
Joomee Song ◽  
Inyoung Choi ◽  
Jinyoung Youn ◽  
Jin Whan Cho
Keyword(s):  
Blood Pressure ◽  
Parkinson’S Disease ◽  
Parkinson's Disease ◽  
Standard Deviation ◽  
Reliable Method ◽  
Blood Pressure Measurement ◽  
International Organization ◽  
Reference Device ◽  
Validation Criterion ◽  
The Mean

Objectives: We aimed to validate the accuracy of blood pressure (BP) measurement using a smartwatch in patients with Parkinson's disease (PD).Materials and Methods: We compared 168 pairs of BP (n = 56) measurements acquired by a smartwatch (SM-R850) with those measured by a sphygmomanometer (reference device).Results: Differences between the smartwatch BP and reference BP measurements were compared. The mean and standard deviation of the differences systolic BP (SBP) and diastolic BP (DBP), measured by smartwatch and reference device, fulfilled both criterion 1 (0.4 ± 4.6 and 1.1 ± 4.5 mm Hg for DBP and SBP, respectively) and criterion 2 (0.2 ± 2.5 and 0.9 ± 2.4 mm Hg for DBP and SBP, respectively) of the BP validation criterion of the International Organization for Standardization.Conclusion: BP measurement using a smartwatch with a photoplethysmography sensor is an accurate and reliable method in patients with PD.

scholarly journals Hemodynamic Status During Endovascular Stroke Treatment: Association of Blood Pressure with Functional Outcome

2021 ◽  
Author(s):  
Min Chen ◽  
Dorothea Kronsteiner ◽  
Johannes Pfaff ◽  
Simon Schieber ◽  
Laura Jäger ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Standard Deviation ◽  
Functional Outcome ◽  
Scale Score ◽  
Endovascular Therapy ◽  
National Institutes Of Health ◽  
Modified Rankin Scale ◽  
Vessel Occlusion ◽  
Stroke Treatment ◽  
The Mean

Abstract Background Optimal blood pressure (BP) management during endovascular stroke treatment in patients with large-vessel occlusion is not well established. We aimed to investigate associations of BP during different phases of endovascular therapy with reperfusion and functional outcome. Methods We performed a post hoc analysis of a single-center prospective study that evaluated a new simplified procedural sedation standard during endovascular therapy (Keep Evaluating Protocol Simplification in Managing Periinterventional Light Sedation for Endovascular Stroke Treatment). BP during endovascular therapy in patients was managed according to protocol. Data from four different phases (baseline, pre-recanalization, post recanalization, and post intervention) were obtained, and mean BP values, as well as changes in BP between different phases and reductions in systolic BP (SBP) and mean arterial pressure (MAP) from baseline to pre-recanalization, were used as exposure variables. The main outcome was a modified Rankin Scale score of 0–2 three months after admission. Secondary outcomes were successful reperfusion and change in the National Institutes of Health Stroke Scale score after 24 h. Multivariable linear and logistic regression models were used for statistical analysis. Results Functional outcomes were analyzed in 139 patients with successful reperfusion (defined as thrombolysis in cerebral infarction grade 2b–3). The mean (standard deviation) age was 76 (10.9) years, the mean (standard deviation) National Institutes of Health Stroke Scale score was 14.3 (7.5), and 70 (43.5%) patients had a left-sided vessel occlusion. Favorable functional outcome (modified Rankin Scale score 0–2) was less likely with every 10-mm Hg increase in baseline (odds ratio [OR] 0.76, P = 0.04) and pre-recanalization (OR 0.65, P = 0.011) SBP. This was also found for baseline (OR 0.76, P = 0.05) and pre-recanalization MAP (OR 0.66, P = 0.03). The maximum Youden index in a receiver operating characteristics analysis revealed an SBP of 163 mm Hg and MAP of 117 mm Hg as discriminatory thresholds during the pre-recanalization phase to predict functional outcome. Conclusions In our protocol-based setting, intraprocedural pre-recanalization BP reductions during endovascular therapy were not associated with functional outcome. However, higher intraprocedural pre-recanalization SBP and MAP were associated with worse functional outcome. Prospective randomized controlled studies are needed to determine whether BP is a feasible treatment target for the modification of outcomes.

Abstract P125: Hypertension, Awareness, Treatment, And Control In Nepal: Results From May Measurement Month 2020 Blood Pressure Screening

Hypertension ◽  
2021 ◽  
Vol 78 (Suppl_1) ◽  
Author(s):  
Pawan Acharya ◽  
Sweta Koirala ◽  
Pabitra Babu Soti ◽  
Sneha Sharma ◽  
Abhishek Sapkota ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Smoking Status ◽  
Blood Pressure Measurement ◽  
Age Groups ◽  
Hypertension Status ◽  
Safety Measures ◽  
Treatment Of Hypertension ◽  
Hypertension Awareness ◽  
The Mean ◽  
And Control

Background: May Measurement Month (MMM) 2020 was not officially executed globally due to the COVID-19 pandemic. But in Nepal, the MMM 2020 was conducted by following COVID-19 safety measures. Methods: We used an opportunistic screening campaign for blood pressure measurement among individuals ≥18 years in Nepal. Of the three measurements, the second and third measurements were used to estimate the mean systolic and diastolic blood pressure(BP). We defined hypertension as the systolic BP ≥ 120 or diastolic BP≥90 mmHg and or currently taking antihypertensive medicine. Results: Among the total 11,486 participants, 57%(6568/11486) were females. The mean age of the screenees was 45years(SD=17.0). The mean systolic and diastolic BP were 125.8(SD= 18.0) and 81.6(SD=10.5) respectively. About 31.3%(3592/11481) participants had hypertension. Among the hypertensive persons, 40.2%(1444/3592) were aware of their hypertension status. Among these who were aware, 79.4%(1146/1444) were taking antihypertensive medicine. However, the overall proportion of hypertensive patients taking medicine was 32.0%(1146/3592). The BP was controlled among 46% ( 527/1444) of participants who were under medication. Logistic regression analysis adjusting age, sex, body mass index(BMI), and smoking status found males, higher age groups, higher BMI, and smokers had higher odds of being hypertensive. (Figure 1) Conclusion: The results suggest a need to address the gap in awareness, diagnosis, and treatment of hypertension in Nepal. The results are limited due to the non-random participation of screenees. Figure 1. Odds ratio plot

scholarly journals Twenty-four-hour and office blood pressure measurement in a comprehensive assessment of the effectiveness of 12-week therapy with a triple fixed-dose combination of amlodipine/indapamide/perindopril in hypertensive patients in actual clinical practice

2021 ◽  
Vol 26 (5) ◽  
pp. 4498
Author(s):  
V. M. Gorbunov ◽  
Yu. A. Karpov ◽  
E. V. Platonova ◽  
Ya. N. Koshelyaevskaya
Keyword(s):  
Blood Pressure ◽  
Clinical Practice ◽  
Antihypertensive Therapy ◽  
Blood Pressure Measurement ◽  
Fixed Dose Combination ◽  
Fixed Dose ◽  
Actual Clinical Practice ◽  
Dose Combination ◽  
The Mean

Aim. To study the efficacy and safety of the triple fixed-dose combination (FDC) of amlodipine/indapamide/perindopril on blood pressure (BP) profile in patients with grade I-II hypertension (HTN) in actual clinical practice.Material and methods. Data from 54 patients with paired 24-hour ambulatory BP monitoring (ABPM) data were included in the TRICOLOR subanalysis (ClinicalTrials. gov study ID — NCT03722524). The mean 24-hour, daytime, and nighttime BP were calculated at baseline and after 12-week follow-up. We determined the proportion of patients with nocturnal HTN (≥120/70 mm Hg) and nocturnal hypotension (<100/60 and <90/50 mm Hg) initially and after 12 weeks of triple FDC therapy. Patients with nocturnal BP decrease included dippers (D; 10-20%), reduced dippers (RD; 0-10%) and extreme dippers (ED; >20%), as well as those without nocturnal BP decrease (>0%, non-dipper (ND)). The smoothness index (SI) was analyzed as the ratio of the mean hourly SBP fall to its mean standard deviation in paired ABPM. To assess the BP phenotypes, two methods were used with reference values of <130/80 and <140/90 mm Hg for ABPM and office BP, respectively. Controlled hypertension (CHT), uncontrolled hypertension (UHT), white coat hypertension (WHT) and masked ineffectiveness of antihypertensive therapy were distinguished.Results. Among 1247 participants of the TRICOLOR study, 54 patients with valid paired ABPM were selected (men, 46%; mean age, 57,7 [12,1] years; mean office BP, 150,4 [16,6]/93,3 [10,7] mm Hg; HTN duration, 8,3 [7,5] years). Initially, the mean 24-hour, daytime and nighttime BP was 141,1 [15,4]/85,9 [9,9], 144,2 [15,5]/88,8 [10,5] and 132,6 [18,0]/78,1 [9,9] mm Hg, respectively. After 12-week follow-up, the mean 24-hour, daytime and nighttime BP was 123,1 [10,5]/75,6 [8,5], 125,7 [10,9]/77,9 [8,7] and 115,4 [10,2]/68,6 [8,8] mm Hg, respectively (p<0,001). After 12-week follow-up, the proportion of patients with nocturnal hypertension decreased from 64,8% to 25,0% (2,6 times) (p<0,001). The proportion of NDs and EDs decreased from 16,7% and 7,4% to 5,8% and 0%, respectively (p=0,048); the proportion of patients with RD and D patterns increased from 42,6% and 33,3 to 57,7% and 36,5%, respectively (p=0,048). With triple FDC therapy, the SI during the day was higher than 0,73 in half of the cases. According to the two methods, the proportion of patients with UHT decreased from 81,6% to 4,4%, WHT from 12,2% to 0%. The prevalence of CHT increased from 4,1% to 57,8%, while masked ineffectiveness of antihypertensive therapy — from 2,0% to 37,8%.Conclusion. Twelve-week FDC therapy of amlodipine/indapamide/perindopril led to a significant fall in the mean 24-hour, daytime and nighttime BP values. Comprehensive analysis of two techniques (24-hour and office BP measurement) identified patients requiring further triple FGC titration.

Vision-based target point tracking and aiming method

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Xiao Bo Liang ◽  
Xinghua Qu ◽  
YuanJun Zhang ◽  
Lianyin Xu ◽  
Fumin Zhang
Keyword(s):  
Standard Deviation ◽  
Target Tracking ◽  
High Precision ◽  
Visual Tracking ◽  
Laser Ranging ◽  
Content Type ◽  
Mean Error ◽  
Wide Range ◽  
The Mean ◽  
Correlation Filtering

Purpose Laser absolute distance measurement has the characteristics of high precision, wide range and non-contact. In laser ranging system, tracking and aiming measurement point is the precondition of automatic measurement. To solve this problem, this paper aims to propose a novel method. Design/methodology/approach For the central point of the hollow angle coupled mirror, this paper proposes a method based on correlation filtering and ellipse fitting. For non-cooperative target points, this paper proposes an extraction method based on correlation filtering and feature matching. Finally, a visual tracking and aiming system was constructed by combining the two-axis turntable, and experiments were carried out. Findings The target tracking algorithm has an accuracy of 91.15% and a speed of 19.5 frames per second. The algorithm can adapt to the change of target scale and short-term occlusion. The mean error and standard deviation of the center point extraction of the hollow Angle coupling mirror are 0.20 and 0.09 mm. The mean error and standard deviation of feature points matching for non-cooperative target were 0.06 mm and 0.16 mm. The visual tracking and aiming system can track a target running at a speed of 0.7 m/s, aiming error mean is 1.74 pixels and standard deviation is 0.67 pixel. Originality/value The results show that this method can achieve fast and high precision target tracking and aiming and has great application value in laser ranging.

scholarly journals Long Working Hours and the Prevalence of Masked and Sustained Hypertension

Hypertension ◽  
2020 ◽  
Vol 75 (2) ◽  
pp. 532-538 ◽  
Author(s):  
Xavier Trudel ◽  
Chantal Brisson ◽  
Mahée Gilbert-Ouimet ◽  
Michel Vézina ◽  
Denis Talbot ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Ambulatory Blood Pressure ◽  
Blood Pressure Measurement ◽  
Prevalence Ratio ◽  
Working Hours ◽  
Masked Hypertension ◽  
Clinic Blood Pressure ◽  
Long Working Hours ◽  
Sustained Hypertension ◽  
The Mean

Previous studies on the effect of long working hours on blood pressure have shown inconsistent results. Mixed findings could be attributable to limitations related to blood pressure measurement and the lack of consideration of masked hypertension. The objective was to determine whether individuals who work long hours have a higher prevalence of masked and sustained hypertension. Data were collected at 3-time points over 5 years from 3547 white-collar workers. Long working hours were self-reported, and blood pressure was measured using Spacelabs 90207. Workplace clinic blood pressure was defined as the mean of the first 3readings taken at rest at the workplace. Ambulatory blood pressure was defined as the mean of the next readings recorded every 15 minutes during daytime working hours. Masked hypertension was defined as clinic blood pressure < 140/90 mm Hg and ambulatory blood pressure ≥135/85 mm Hg. Sustained hypertension was defined as clinic blood pressure ≥140/90 mm Hg and ambulatory blood pressure ≥135/85 mm Hg or being treated hypertension. Long working hours were associated with the prevalence of masked hypertension (prevalence ratio 49+ =1.70 [95% CI, 1.09–2.64]), after adjustment for sociodemographics, lifestyle-related risk factors, diabetes mellitus, family history of cardiovascular disease, and job strain. The association with sustained hypertension was of a comparable magnitude (prevalence ratio 49+ =1.66 [95% CI, 1.15–2.50]). Results suggest that long working hours are an independent risk factor for masked and sustained hypertension. Workplace strategies targeting long working hours could be effective in reducing the clinical and public health burden of hypertension.

Accuracy of the London School of Hygiene and Remler M2000 sphygmomanometers

1981 ◽  
Vol 61 (s7) ◽  
pp. 399s-401s ◽  
Author(s):  
D. J. Fitzgerald ◽  
W. G. O'Callaghan ◽  
K. O'Malley ◽  
E. T. O'Brien
Keyword(s):  
Blood Pressure ◽  
Pressure Measurement ◽  
Blood Pressure Measurement ◽  
Calibration Error ◽  
London School ◽  
Lower Blood ◽  
Significant Difference ◽  
Blood Pressures ◽  
The Mean ◽  
Selection Of

1. The accuracy of the Remler M2000, a semiautomatic portable blood pressure recorder, was assessed with the London School of Hygiene (LSH) and Hawkesley random-zero sphygmomanometers used as reference standards. 2. The Remler gave higher recordings than the LSH sphygmomanometer, the mean systolic and diastolic differences being 5.9 mmHg (P &lt; 0.001) and 4.7 mmHg (P &lt; 0.001) respectively. No significant difference was demonstrated between paired Remler and Hawkesley recordings. 3. When simultaneous paired LSH and Hawkesley sphygmomanometer recordings were compared, the LSH gave lower blood pressures: 7.1 mmHg (P &lt; 0.001) for systolic and 3.6 mmHg (P &lt; 0.001) for diastolic recordings. 4. The LSH sphygmomanometer underestimates blood pressure, partly due to a calibration error but also because the selection of end points for this device differs from other methods of blood pressure measurement.

Regression to the mean: Error reduction versus blood pressure normalization by sports training

2011 ◽  
Vol 29 (6) ◽  
pp. 645-647
Author(s):  
Yi-Liang Chen ◽  
Ding-Peng Yeh ◽  
Shin-Da Lee ◽  
Chia-Hua Kuo
Keyword(s):  
Blood Pressure ◽  
Error Reduction ◽  
Sports Training ◽  
Regression To The Mean ◽  
Mean Error ◽  
The Mean

scholarly journals Accuracy of abbreviated protocols for unattended automated office blood pressure measurements, a retrospective study

PLoS ONE ◽  
2021 ◽  
Vol 16 (3) ◽  
pp. e0248586
Author(s):  
Annina S. Vischer ◽  
Rebecca Hug ◽  
Thenral Socrates ◽  
Andrea Meienberg ◽  
Michael Mayr ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Blood Pressure Measurement ◽  
Pressure Measurements ◽  
Single Measurement ◽  
Single Centre ◽  
Limits Of Agreement ◽  
Mean Values ◽  
Single Centre Study ◽  
The Mean ◽  
Automated Office Blood Pressure

Background Blood pressure measurement (BPM) is one of the most often performed procedures in clinical practice, but especially office BPM is prone to errors. Unattended automated office BPM (AOBPM) is somewhat standardised and observer-independent, but time and space consuming. We aimed to assess whether an AOBPM protocol can be abbreviated without losing accuracy. Design In our retrospective single centre study, we used all AOBPM (AOBPM protocol of the SPRINT study), collected over 14 months. Three sequential BPM (after 5 minutes of rest, spaced 2 minutes) were automatically recorded with the patient alone in a quiet room resulting in three systolic and diastolic values. We compared the mean of all three (RefProt) with the mean of the first two (ShortProtA) and the single first BPM (ShortProtB). Results We analysed 413 AOBPM sets from 210 patients. Mean age was 52±16 years. Mean values for RefProt were 128.3/81.3 mmHg, for ShortProtA 128.4/81.4 mmHg, for ShortProtB 128.8/81.4 mmHg. Mean difference and limits of agreement for RefProt vs. ShortProtA and ShortProtB were -0.1±4.2/-0.1±2.8 mmHg and -0.5±8.1/-0.1±5.3 mmHg, respectively. With ShortProtA, 83% of systolic and 92% of diastolic measurements were within 2 mmHg from RefProt (67/82% for ShortProtB). ShortProtA or ShortProtB led to no significant hypertensive reclassifications in comparison to RefProt (p-values 0.774/1.000/1.000/0.556). Conclusion Based on our results differences between the RefProt and ShortProtA are minimal and within acceptable limits of agreement. Therefore, the automated procedure may be shorted from 3 to 2 measurements, but a single measurement is insufficient.

Sign in / Sign up

Export Citation Format

Share Document