Measurement of digital blood pressure after local cooling

1977 ◽  
Vol 43 (5) ◽  
pp. 907-910 ◽  
Author(s):  
S. L. Nielsen ◽  
N. A. Lassen
Keyword(s):  
Blood Pressure ◽  
Blood Pressure Measurement ◽  
Proximal Phalanx ◽  
Systolic Pressure ◽  
Threshold Temperature ◽  
Local Cooling ◽  
The Difference ◽  
Arterial Tone ◽  
Percent Decrease ◽  
Finger Pressure

A double-inlet plastic cuff was designed for local cooling and systolic blood pressure measurement on the middle phalanx of the fingers. With a tourniquet on the proximal phalanx of one finger, cooling for 5 min made the digital artery temperature equal the skin temperature. The difference between the systolic pressure in a control finger and in the cooled finger give the reopening pressure in the digital arteries. At 30, 25, 20, 15, and 10 degrees C, respectively the percent decrease of the finger pressure was 0.2 (0.2), 1.5 (2.5), 8.5 (3.7), 11.4 (3.4), and 15.3 (3.1) in normal young women. In patients with primary or secondary Raynaud's phenomenon, the arterial tone showed an abrupt increase that most often led to complete closure of the digital arteries. The pathological response was expressed as an increased threshold temperature or a well-defined closing temperature that showed only small variations during standardized conditions.

scholarly journals PERBANDINGAN TEKANAN DARAH ANTARA ANAK YANG TINGGAL DI PEGUNUNGAN DAN PESISIR PANTAI

e-CliniC ◽  
2015 ◽  
Vol 3 (1) ◽  
Author(s):  
Queen Mandang ◽  
Adrian Umboh ◽  
Stefanus Gunawan
Keyword(s):  
Blood Pressure ◽  
Diastolic Pressure ◽  
Sodium Intake ◽  
Blood Pressure Measurement ◽  
Systolic Pressure ◽  
Coastal Areas ◽  
Cross Sectional ◽  
The Difference ◽  
Cross Sectional Design ◽  
History Of Obesity

Abstract: Blood pressure in children varies because there are many factors that influence. One is geographic factors. Based on data from the Health Research in 2007 found that the prevalence of hypertension is highest in coastal areas while the lowest prevalence of hypertension in the coastal area. Altitude and different sodium intake on mountain and coastal areas are assumed to affect the blood pressure. This study aimed to determine the difference in blood pressure between children who live in the mountains and in the coast. We used descriptive analytic method with cross sectional design, with 107 samples according to criteria of children aged 6-12 years with no family history of obesity and hypertension. Data were obtained by using questionnaire, measurement of weight and height (BMI) and blood pressure measurement using a sphygmomanometer and cuff child. The results showed 15.5% of children with high-normal systolic pressure and 17.4% of children with high diastolic pressure in the mountains. In coastal areas, found 28% of children with normal systolic pressure-high, 13% of children of normal-high diastolic pressure, and 5% of children of high diastolic pressure. These data were analyzed using Mann Whitney test, showing the results were not statistically significantly systolic (p = 0.815) diastolic (p = 0.221) so that H0 and H1 is rejected. Conclusion: There was no difference in blood pressure among children aged 6-12 years who live in the mountains and the coast.Keywords: child's blood pressure, mountains, coastal.Abstrak: Tekanan darah pada anak bervariasi karena ada banyak faktor yang memengaruhi. Salah satunya adalah faktor geografis. Berdasarkan data Riset Kesehatan Dasar tahun 2007 didapatkan prevalensi hipertensi tertinggi di wilayah pantai sedangkan prevalensi hipertensi terendah di wilayah pantai. Ketinggian lokasi dan asupan natrium yang berbeda pada daerah pegunungan dan pesisir pantai diasumsikan berpengaruh terhadap tekanan darah. Penelitian ini bertujuan untuk mengetahui perbedaan tekanan darah antara anak yang tinggal di pegunungan dan pesisir pantai. Metode penelitian deskriptif analitik dengan rancangan potong lintang, dengan 107 sampel sesuai kriteria anak umur 6-12 tahun tanpa obesitas dan riwayat keluarga hipertensi. Data diperoleh melalui kuesioner, pengukuran berat badan dan tinggi badan (IMT) dan pengukuran tekanan darah menggunakan sphygmomanometer dan manset anak. Hasil penelitian menunjukkan 15,5% anak dengan tekanan sistolik normal-tinggi dan 17,4% anak dengan tekanan diastolik tinggi pada daerah pegunungan. Pada daerah pesisir pantai ditemukan 28% anak dengan tekanan sistolik normal-tinggi, 13% anak tekanan diastolik normal-tinggi, dan 5% anak tekanan diastolik tinggi. Data ini dianalisis menggunakan uji mann whitney, menunjukkan hasil secara statistik tidak bermakna sistolik (p=0,815) diastolik (p=0,221) sehingga H0 diterima dan H1 ditolak. Simpulan: Tidak ada perbedaan tekanan darah antara anak berumur 6-12 tahun yang tinggal di pegunungan dan pesisir pantai.Kata kunci: tekanan darah anak, pegunungan, pantai.

scholarly journals Combined deep CNN–LSTM network-based multitasking learning architecture for noninvasive continuous blood pressure estimation using difference in ECG-PPG features

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Da Un Jeong ◽  
Ki Moo Lim
Keyword(s):  
Blood Pressure ◽  
Blood Pressure Measurement ◽  
Patient Specific ◽  
Peak Time ◽  
Simultaneous Prediction ◽  
Deep Cnn ◽  
Pressure Estimation ◽  
The Difference ◽  
Blood Pressure Estimation ◽  
Continuous Blood Pressure

AbstractThe pulse arrival time (PAT), the difference between the R-peak time of electrocardiogram (ECG) signal and the systolic peak of photoplethysmography (PPG) signal, is an indicator that enables noninvasive and continuous blood pressure estimation. However, it is difficult to accurately measure PAT from ECG and PPG signals because they have inconsistent shapes owing to patient-specific physical characteristics, pathological conditions, and movements. Accordingly, complex preprocessing is required to estimate blood pressure based on PAT. In this paper, as an alternative solution, we propose a noninvasive continuous algorithm using the difference between ECG and PPG as a new feature that can include PAT information. The proposed algorithm is a deep CNN–LSTM-based multitasking machine learning model that outputs simultaneous prediction results of systolic (SBP) and diastolic blood pressures (DBP). We used a total of 48 patients on the PhysioNet website by splitting them into 38 patients for training and 10 patients for testing. The prediction accuracies of SBP and DBP were 0.0 ± 1.6 mmHg and 0.2 ± 1.3 mmHg, respectively. Even though the proposed model was assessed with only 10 patients, this result was satisfied with three guidelines, which are the BHS, AAMI, and IEEE standards for blood pressure measurement devices.

scholarly journals The difference in pediatric blood pressure between middle childhood and late childhood prior to dental treatment

2018 ◽  
Vol 25 (1) ◽  
Author(s):  
Fitri Anissa Syaimima Syaiful Azim ◽  
Arlette Suzy Puspa Pertiwi ◽  
Rosiliwati Wihardja
Keyword(s):  
Blood Pressure ◽  
Middle Childhood ◽  
Dental Treatment ◽  
Systolic Pressure ◽  
The Body ◽  
Late Childhood ◽  
Test Analysis ◽  
Mean Values ◽  
Significant Difference ◽  
The Difference

Every child will go through several stages in his or her life. They are different from each other as they are in the process of development of cognition, physics, emotion, and personality. For many children, a visit to the dentist can raise their anxiety. This anxiousness will lead to stress that influences the cardiovascular function in the body. The purpose of this research was to determine the difference in pediatric blood pressure between middle childhood and late childhood prior to dental treatment. This research was a clinical trial, pure experimental study. The sample consisted of 30 children within the range of 4-12 years old where they were divided into two groups of age; middle childhood (4-7 years old) and late childhood (8-12 years old). The blood pressures were measured before any dental treatment began and the values were recorded. The data were then analyzed using the One-Sample T-Test analysis. The results of blood pressure in middle childhood and late childhood were compared to the average mean values for each age group. It showed that there was a significant difference in the systolic pressure, which was found higher in the middle childhood group compared to the late childhood. From the result can be concluded that there was a difference in the pediatric blood pressure between middle childhood and late childhood prior to dental treatment.

Effects of Crossing Legs on Blood Pressure Measurement

2001 ◽  
Vol 10 (2) ◽  
pp. 202-213 ◽  
Author(s):  
Rebecca Keele-Smith ◽  
CeCilia Price-Daniel
Keyword(s):  
Blood Pressure ◽  
Pressure Measurement ◽  
Diastolic Pressure ◽  
Blood Pressure Measurement ◽  
Systolic Pressure ◽  
Nursing Intervention ◽  
Health Condition ◽  
Senior Population

The purpose of this study was to determine if blood pressure measurement is affected by the leg crossed at the knee as compared with feet flat on the floor in a well-senior population. Participants (N = 110) either had their blood pressure measured with feet flat first and then crossed or the reverse of this. Results indicate that blood pressure was significantly higher when legs were crossed versus uncrossed. Systolic pressure changed by 5.9 mmHg, from 127.32 to 133.24, whereas diastolic pressure changed by 2.97, from 72.54 to 75.52. There were no significant differences between those who had their blood pressure measured first with their legs crossed versus uncrossed or between those with and without hypertension. Instructing patients to keep feet flat on the floor during blood pressure measurement is an important nursing intervention that can contribute to the accurate measurement, interpretation, and treatment of a patient's health condition.

scholarly journals Influence on Calculated Blood Pressure of Measurement Posture for the Development of Wearable Vital Sign Sensors

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Shouhei Koyama ◽  
Hiroaki Ishizawa ◽  
Akio Sakaguchi ◽  
Satoshi Hosoya ◽  
Takashi Kawamura
Keyword(s):  
Blood Pressure ◽  
Calibration Curve ◽  
Pressure Measurement ◽  
Pulse Wave ◽  
Blood Pressure Measurement ◽  
Wave Signal ◽  
Fbg Sensor ◽  
Pressure Calculation ◽  
Measurement Height ◽  
The Difference

We studied a wearable blood pressure sensor using a fiber Bragg grating (FBG) sensor, which is a highly accurate strain sensor. This sensor is installed at the pulsation point of the human body to measure the pulse wave signal. A calibration curve is built that calculates the blood pressure by multivariate analysis using the pulse wave signal and a reference blood pressure measurement. However, if the measurement height of the FBG sensor is different from the reference measurement height, an error is included in the reference blood pressure. We verified the accuracy of the blood pressure calculation with respect to the measurement height difference and the posture of the subject. As the difference between the measurement height of the FBG sensor and the reference blood pressure measurement increased, the accuracy of the blood pressure calculation decreased. When the measurement height was identical and only posture was changed, good accuracy was achieved. In addition, when calibration curves were built using data measured in multiple postures, the blood pressure of each posture could be calculated from a single calibration curve. This will allow miniaturization of the necessary electronics of the sensor system, which is important for a wearable sensor.

Changes in finger-aorta pressure transfer function during and after exercise

2006 ◽  
Vol 101 (4) ◽  
pp. 1207-1214 ◽  
Author(s):  
Wim J. Stok ◽  
Berend E. Westerhof ◽  
John M. Karemaker
Keyword(s):  
Blood Pressure ◽  
Transfer Functions ◽  
Diastolic Pressure ◽  
Systolic Pressure ◽  
Aortic Pressure ◽  
Finger Blood Pressure ◽  
Mean Pressure ◽  
Catheter Tip ◽  
The Individual ◽  
Finger Pressure

Noninvasive finger blood pressure has become a surrogate for central blood pressure under widely varying circumstances. We tested the validity of finger-aorta transfer functions (TF) to reconstruct aortic pressure in seven cardiac patients before, during, and after incremental bicycle exercise. The autoregressive exogenous model method was used for calculating finger-aorta TFs. Finger pressure was measured noninvasively using Finapres and aortic pressure using a catheter-tip manometer. When applying the individual TFs found during rest for reconstruction of aortic pressure during all workloads, systolic pressure was increasingly underestimated, with large variation between subjects: +4.0 to −18.1 mmHg. In most subjects, diastolic pressure was overestimated: −3.9 to +5.5 mmHg. Pulse pressure estimation varied between +4.5 and −21.9 mmHg. In all cases, wave distortion was present. Postexercise, error in reconstructed aortic systolic pressure slowly declined, and diastolic pressure was overestimated. During rest, the TF gain had a minimum between 3.65 and 4.85 Hz (Fmin). During exercise, Fmin shifted to frequencies between 4.95 and 7.15 Hz at the maximum workload, with no change in gain. Postexercise, gain in most subjects shifted to values closer to unity, whereas Fmin did not return to resting values. Within each subject, aorta-Finapres travel time was linearly related to mean pressure. During exercise, Fmin was linearly related to both delay and heart rate. We conclude that, during increasing exercise, rest TFs give an increasingly unreliable reconstruction of aortic pressure, especially at higher heart rates.

Indirect Arterial Blood Pressure Measurement in Nonsedated Irish Wolfhounds: Reference Values for the Breed

2002 ◽  
Vol 38 (6) ◽  
pp. 521-526 ◽  
Author(s):  
Janice M. Bright ◽  
Mariellen Dentino
Keyword(s):  
Blood Pressure ◽  
Arterial Blood Pressure ◽  
Reference Values ◽  
Diastolic Pressure ◽  
Blood Pressure Measurement ◽  
Systolic Pressure ◽  
Standing Position ◽  
Mean Value ◽  
Pressure Measurements ◽  
Arterial Blood

Arterial blood pressure measurements were obtained from 158 healthy Irish wolfhounds using the oscillometric technique to establish reference values for the breed. In contrast to other sight hounds, Irish wolfhounds have low arterial blood pressure. Mean systolic pressure for the group was 116.0 mm Hg. Mean diastolic pressure was 69.2 mm Hg, and the mean value for mean arterial pressure was 87.8 mm Hg. Blood pressure measurements were higher in older wolfhounds than in young dogs. There was no difference between systolic and mean arterial blood pressures in lateral recumbency compared to standing position. However, diastolic pressure was slightly lower when standing. Calm dogs had lower pressure than anxious wolfhounds. There was a significant interaction between the effects of age, gender, and mood on systolic, diastolic, and mean arterial blood pressure values.

scholarly journals PTT-based Contact-less Blood Pressure Measurement using an RGB-Camera

2021 ◽  
Vol 7 (2) ◽  
pp. 375-378
Author(s):  
Carolin Wuerich ◽  
Robin Rademacher ◽  
Christian Wiede ◽  
Anton Grabmaier
Keyword(s):  
Blood Pressure ◽  
Diastolic Blood Pressure ◽  
Pressure Measurement ◽  
Blood Pressure Measurement ◽  
Systolic Pressure ◽  
Pulse Transit Time ◽  
Invasive Blood Pressure ◽  
Non Invasive ◽  
Individual Calibration ◽  
Cardiac System

Abstract Commonly used blood pressure measurement devices have noticeable limitations in accuracy, measuring time, comfort or safety. To overcome these limitations, we developed and tested a surrogate-based, non-invasive blood pressure measurement method using an RGB-camera. Our proposed method employs the relation between the pulse transit time (PTT) and blood pressure. Two remote photoplethysmography (rPPG) signals at different distances from the heart are extracted to calculate the temporal delay of the pulse wave. In order to establish the correlation between the PTT values and the blood pressure, a regression model is trained and evaluated. Tests were performed with five subjects, where each subject was recorded fifteen times for 30 seconds. Since the physiological parameters of the cardiac system are different for each person, an individual calibration is required to obtain the systolic and diastolic blood pressure from the PTT values. The calibration results are limited by the small number of samples and the accuracy of the reference system. However, our results show a strong correlation between the PTT values and the blood pressure and we obtained a mean error of 0.18 +/- 5.50 mmHg for the diastolic blood pressure and 0.01 +/- 7.71 mmHg for the systolic pressure, respectively.

Covariation and Temporal Stability of Peripheral and Brachial Blood Pressure Responses to Mental and Static Stress

2001 ◽  
Vol 15 (3) ◽  
pp. 198-207 ◽  
Author(s):  
Andreas Hinz ◽  
Reingard Seibt ◽  
Klaus Scheuch
Keyword(s):  
Blood Pressure ◽  
Mental Arithmetic ◽  
Blood Pressure Measurement ◽  
Temporal Stability ◽  
Physiological Parameters ◽  
Brachial Blood Pressure ◽  
Change Scores ◽  
The Difference ◽  
Blood Pressure Responses ◽  
Promising Development

Abstract Peripheral blood pressure measurement (Finapres technique) is a promising development in activation research. This paper tests and compares the temporal stability and covariation of peripheral and brachial blood pressure responses. Forty healthy subjects were tested four times at intervals of 1 day, 1 week, and 1 month. The tasks employed were two mental tasks (mental arithmetic and a Color Word Test) and a static (fingergrip) task. Recorded physiological parameters were peripheral and brachial systolic (SBP) and diastolic blood pressure (DBP). Mean peripheral SBP was about 20 mmHg higher than brachial SBP, but the difference between the DBP measures was negligible. Correlations between peripheral and corresponding brachial BP resting levels were low, with coefficients below 0.30. The correlations between peripheral and brachial SBP and DBP were higher for reactivity (change) scores (0.46-0.82) than for resting scores. Several types of inter- and intraindividual covariation were calculated to provide a deeper understanding of the relationship between the physiological parameters with respect to their dynamics. Temporal stability of peripheral BP level scores was lower (0.37-0.57) than for brachial BP (0.59-0.77), but the stability of the change scores was similar for both BP techniques. The results show that it is important to distinguish between several aspects of the mutual relationship between peripheral and brachial BP measures. Peripheral BP measurements are not suited to assess the BP level of a subject, but they are very useful to assess cardiovascular reactivity.

Blood pressure variations and low blood pressure values at home after hospital discharge in older hypertensives

2011 ◽  
Vol 19 (3) ◽  
pp. 460-466
Author(s):  
Marco Astengo ◽  
Martina Bonetto ◽  
Gianluca Isaia ◽  
Monica Comba ◽  
Gianfranco Fonte ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Hospital Discharge ◽  
Terminal Illness ◽  
Blood Pressure Measurement ◽  
University Teaching ◽  
Antihypertensive Regimen ◽  
Low Blood Pressure ◽  
Study Population ◽  
The Difference ◽  
At Home

Background: Blood pressure (BP) variations occurring after hospital discharge in a population of older hypertensives have not been previously investigated. Design: elderly (≥65 years) hypertensives admitted to the geriatric acute ward of a university-teaching hospital were enrolled in this prospective observational study. Methods: Exclusion criteria were terminal illness, discharge to institution, and changes in antihypertensive regimen. BP was recorded in the emergency room, at ward admission, daily during hospital stay, and at discharge. Home self blood pressure measurement was performed after discharge. Results: The study population included 106 patients. There was a significant decrease in systolic BP (SBP) and diastolic BP (DBP) throughout the study time points. SBP and DBP decreased after discharge (from 135.1 ± 15.0 to 131.5 ± 16.1 mmHg and from 77.2 ± 8.4 to 71.6 ± 8.7 mmHg, respectively), the difference being significant only for DBP ( p = 0.000). We further observed higher prevalence of critically low BP values (SBP <120 mmHg and DBP <70 mmHg) at home (23.6% and 48.1%, respectively) compared to discharge (8.5% and 9.4%, p = 0.006 and p = 0.000, respectively). Conclusions: We observed a decrease in BP values, and particularly DBP values, after hospital discharge, in a sample of older hypertensives. Critically low BP values were observed at home in a high proportion of subjects, suggesting wise use of antihypertensive therapy at discharge and early monitoring of BP values at home.

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