2013
DOI: 10.4236/jbise.2013.61001
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Multi-center pragmatic studies evaluating the time indicator of cardiac perfusion reserve

Abstract:

Background: Since the greater part of coronary blood flow takes place during the diastolic phase of each cardiac cycle, a time indicator of myocardial perfusion reserve, the ratio of diastolic to systolic duration (D/S ratio), was presented. The objective of this study was to evaluate the accuracy and precision, the biological implication, and the … Show more

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Cited by 4 publications
(4 citation statements)
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“…Data of measurement of D/S ratio, S1/S2, and HR for 4 species are shown in Table 1. The baseline data of humans measured previously served as reference [10]. (10) 1.36 ± 0.13 3.37 ± 0.71 160 ± 31 D/S ratio: the ratio of diastolic to systolic duration; S1/S2: the ratio of the amplitude of the first heart sound to the amplitude of the second heart sound ; HR: heart rate.…”
Section: Resultsmentioning
confidence: 99%
“…Data of measurement of D/S ratio, S1/S2, and HR for 4 species are shown in Table 1. The baseline data of humans measured previously served as reference [10]. (10) 1.36 ± 0.13 3.37 ± 0.71 160 ± 31 D/S ratio: the ratio of diastolic to systolic duration; S1/S2: the ratio of the amplitude of the first heart sound to the amplitude of the second heart sound ; HR: heart rate.…”
Section: Resultsmentioning
confidence: 99%
“…Heart sound signal is the direct manifestation of cardiac mechanical activity, which can safely, easily, and accurately provide the information on cardiac cycle and the durations of its components [21,22]. In this study we examined the indicators of cardiac reserve function for the women with gestational hypertension, the results show that the cardiac reserve function of gestational hypertension women is lower than normal pregnant women and it reduced with the increase of gestational age.…”
Section: Discussionmentioning
confidence: 96%
“…The cardiac reserve function decreased gradually with gestational age [15][16][17]. For example, in the study by Xiong et al, with the increase in the number of weeks of pregnancy and progress of pre-eclampsia, the number of subjects with D/S ratio ≥ 1.5 was decreased and the number of subjects with D/S ratio < 1.2 was increased [21]. Moreover it also can be relevant with a variety of factors such as age, pregnancy complications, prematurity, low weight at birth and so on [18][19][20].…”
Section: Discussionmentioning
confidence: 99%
“…The detection and analyses of heart sounds are an important and economical means to understand the physiological information of the human body and have proven to be valuable for disease detection and biometric identification [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 ]. The most common method for the extraction of heart sound features is time–frequency analysis, represented by the wavelet transform method [ 4 , 10 , 11 , 12 ], and power spectrum analysis, represented by the FFT method [ 13 , 14 , 15 , 16 , 17 ]. Moreover, according to the premise of these analyses, heart-sound signals must be collected in a resting state.…”
Section: Introductionmentioning
confidence: 99%