A new portable device for 24-hour recording of ambulatory intra-arterial blood pressure and heart rate in hypertensive patients.

Tochikubo, Osamu; Oota, Takashi; Miyazaki, Nobuyuki; Kaneko, Yoshihiro

doi:10.1536/ihj.27.661

Cited by 14 publications

(5 citation statements)

References 3 publications

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“…Changes in heart rate (HR) and blood pressure over a 24-h period take place not in a disorderly fashion, but are influenced by several conditions (44)(45)(46)(47)(48). For example, during nocturnal sleep, HR and BP in normotensive and hypertensive subjects (28,45,46).…”

Section: Methods O F Calculating Positive Load and Negative Load Compomentioning

confidence: 99%

Circadian Variation of Hemodynamics and Baroreflex Functions in Patients with Essential Hypertension.

et al. 1997

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It is well known that cardiovascular accidents such as myocardial infarction frequently occur in the morning, but their triggering mechanisms are not clear. The present study investigated circadian variations of hemodynamics and baroreflex functions. Twenty-three patients with essential hypertension were studied. Direct blood pressure (BP) and ECG were recorded by telemeter over 24 h, and then computeranalyzed. The pulse-contour method was used to measure cardiac output (CO) and total peripheral vascular resistance (TPR). The ratio of low to high frequency components (LF/HF) of the RR-interval on ECG was calculated by power spectral analysis. The baroreflex sensitivity index (BR!) was measured on the basis of the ratio d RR/LI Ps (zl Ps= spontaneous decrease in systolic BP, zl RR = change in RR). Furthermore, 24-h BP changes were transformed algebraically into positive load component (PC) and negative load component (NC) by using a Windkessel model. The circadian variation of hematocrit (Ht) was also measured. The least squares method was used to determine the time at which the maximum and minimum value of each measurement occurred. Whereas the maximum values for BP and CO occurred in the evening (18:30, 17:00), the maximum values for TPR and LF/HF occurred between 06:30 and 08:00, and the minimum value for BRI occurred at 08:00. PC significantly correlated with Ps, heart rate, and CO (r=0.81, 0.92, 0.67), and NC significantly correlated with BRI and LFIHF (r=0.71, 0.64). PC (related to cardiovascular function) reached a maximum and NC (related to baroreflex function) reached a minimum in the late morning (11:00). Ht was highest immediately after the subjects got out of bed. These hemodynamic imbalances may negatively influence coronary blood flow in the morning. (Hypertens Res 1997; 20: 157-166)

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Section: Methods O F Calculating Positive Load and Negative Load Compomentioning

confidence: 99%

Circadian Variation of Hemodynamics and Baroreflex Functions in Patients with Essential Hypertension.

et al. 1997

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“…Because of the high positive coefficient of correlation (r) between direct SBP and DBP (rϭ0.70 to 0.98), 11 we used the linearregression formula SBPϭaϫDBPϩb (where a is the regression coefficient and b is constant value) with sleep-time values to obtain the statistical base SBP (SBP 0 ) corresponding to DBP 0 : Values are meanϮSD. KW indicates Keith-Wagner grade: 0 -1ϭnormal or slightly narrowed retinal arteries, 2ϭgeneralized narrowing of retinal arteries, or nipping of veins, 3ϭretinopathy with hemorrhages and cotton-wool spots without papilledema; CTR, cardiothoracic ratio; and SV 1 ϩRV 5 , sum of S in V 1 lead and R in V 5 lead on electrocardiogram.…”

Section: Measurement Of Estimated Base Bp Values From Direct Recordingsmentioning

confidence: 99%

Statistical Base Value of 24-Hour Blood Pressure Distribution in Patients With Essential Hypertension

et al. 1998

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“…Incidentally, because controlling respiration itself may be a stress, respiratory control was not done in the present study. Measurements of ECG for which breathing is not regulated in this way are performed in many clinical studies (22,(24)(25)(26). Furthermore, analysis of autonomic nerve activity is based on the low probability of occurrence of respiratory arrhythmia due to mild stress loading in healthy young people and automatic elimination by the analysis device when an arrhythmia does occur.…”

Section: Discussionmentioning

confidence: 99%

“…Measurements. The subjects wore electrocardiography (ECG) electrodes (disposable monitoring electrode L bead load; Nihon Kohden Industry Co., Ltd.) attached to an ECG monitoring system (TM2425-ECG; A & D Company) (22). Subjects were examined during weekdays from 9 am to 12 am while being kept fasted.…”

Section: Subjectsmentioning

confidence: 99%

Influence of Acute Mental Arithmetic Stress on Taste and Pungency

Sawai

Motomura

Oshima

et al. 2019

J Nutr Sci Vitaminol

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Mental stress is a known risk factor for disease. This study investigated changes in sensations of taste and pungency before and after mental stress. Thirty healthy male university students rested for 20 min, performed mental arithmetic tasks for 10 min, and then underwent measurement of changes in their taste and ability to discern pungency. Taste was measured with the "Taste Disk ® ," and pungency was measured by a filter-paper disc method using capsaicin solution. Subjects were not told the order of the reagent solutions used. To quantify pain sensation, a weak current applied to the central inner forearm skin by a Pain Vision ® quantitative pain sensation analyzer was gradually increased. The degree of stress was measured by portable electrocardiography (ECG). During mental stress, the cognitive threshold of salty taste, sweet taste, and bitterness was significantly decreased, whereas the sensations of pungency and forearm skin pain were increased and showed significant correlation. Based on sympathetic nerve activity analyzed with the ECG, the subjects were divided into the mental stress group and non-mental stress group. The mental stress group experienced an increase in the pungency threshold and sensation of forearm skin pain with significantly high correlations obtained, whereas no correlation was found between these factors in the non-mental stress group. Acute mental stress increased the sensitivity to taste but decreased the sensitivity to the sensation of pungency on the tongue and pain on the skin. Sympathetic activity activated by stress may affect taste and the sensation of pungency.

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A new portable device for 24-hour recording of ambulatory intra-arterial blood pressure and heart rate in hypertensive patients.

Cited by 14 publications

References 3 publications

Circadian Variation of Hemodynamics and Baroreflex Functions in Patients with Essential Hypertension.

Circadian Variation of Hemodynamics and Baroreflex Functions in Patients with Essential Hypertension.

Statistical Base Value of 24-Hour Blood Pressure Distribution in Patients With Essential Hypertension

Influence of Acute Mental Arithmetic Stress on Taste and Pungency

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