Heart Rate Variability in Congestive Heart Failure

Tateishi, Osamu; Shouda, Toru; Azuma, Yoshiyuki; Chin, Kazuo; Nogimura, Takeshi; Gotou, Yutaka; Itou, Tetsushi; Mochizuki, Seibu; Machida, Katsuhiko

doi:10.1081/ceh-100108717

Cited by 4 publications

(5 citation statements)

References 14 publications

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“…Data recorded in the palm-sized electrocardiographic unit were analyzed for HRV by the maximum entropy method (CHIRAM, Suwa Trust Japan, Tokyo, Japan). [11][12][13] In the ward, lights-out time was at 21:00 hours and wake-up time at 06:00 hours; hence, we analyzed the recorded data, defining 21:00-06:00 hours as stage I and 06:00-08:00 hours before arrival in the operation room as stage II. 12 A minimum sample size of 20 was needed to detect a specific Pearson correlation coefficient r, when we expected the correlation coefficient to be 0.6 with a power of 80% (b 5 0.20) and a significance level of 0.05 (a 5 0.05).…”

Section: Methodsmentioning

confidence: 99%

Increased heart rate variability correlation between mother and child immediately pre‐operation

Arai

Ueda

Ushida

et al. 2009

Acta Anaesthesiol Scand

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Section: Methodsmentioning

confidence: 99%

Increased heart rate variability correlation between mother and child immediately pre‐operation

Arai

Ueda

Ushida

et al. 2009

Acta Anaesthesiol Scand

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“…36,37 In addition, increased oxidative stress also activates sympathetic tone. 38 In the present study, the results of multiple linear regression analysis demonstrated that the percent change in LF/HF, a marker of changes in sympathetic tone, [17][18][19] did not correlate with SigmaBS, SigmaINS, or the percent change in the level of TBARS. Therefore, AHG may induce sympathetic activation through multiple mechanisms, including hyperglycemia, hyperinsulinemia, and increased oxidative stress, all of which are also interrelated.…”

Section: Discussionmentioning

confidence: 85%

“…Power spectra were quantified by measuring the areas under the 2 frequency bandwidths: 0.04-0.15 Hz (low-frequency power, LF) and 0.15-0.40 Hz (high-frequency power, HF), using the maximum entropy method (MemCalc; Suwa Trust, Tokyo, Japan). [17][18][19] The ratio of the LF/HF was calculated and used as a marker of sympathetic tone. [17][18][19] …”

Section: Measurement Of Hrvmentioning

confidence: 99%

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Close Relationship Between Sympathetic Activation and Coronary Microvascular Dysfunction During Acute Hyperglycemia in Subjects With Atherosclerotic Risk Factors

Takei

Tomiyama

Tanaka

et al. 2007

Circ J

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he Framingham offspring study has demonstrated that post-challenge hyperglycemia is an independent risk factor for cardiovascular disease, 1 and that stress hyperglycemia is one of the determinants of the outcome after myocardial infarction. 2,3 In this context, it is thought that coronary microvascular dysfunction related to stress hyperglycemia might be one of the possible reasons for the poor outcome in patients with acute myocardial infarction with stress hyperglycemia, and also for the improvement of epicardial coronary blood flow and outcome in these patients after nicorandil administration. 4 Thus, the association between acute hyperglycemia (AHG) and coronary microvascular function (ie, hyperemic response of coronary blood flow or coronary flow reserve) should be thoroughly examined. Although some studies have demonstrated that AHG may impair flow-mediated vasodilatation in the peripheral arteries, 5,6 which might be a predictor of future cardiovascular events, 7 the effect of AHG on coronary microvascular function has not been fully clarified. Increased oxidative stress 8 and/or sympathetic activation 9 have been demonstrated to contribute to impairment of coronary microvascular function, and both of these pathophysiological abnormalities are also observed during AHG.However, the influence of these abnormalities caused by AHG on coronary microvascular function has not been fully evaluated.Recently, transthoracic Doppler, which can be used to estimate coronary microvascular function in a non-invasive manner, has become feasible in the clinical setting. [10][11][12] Therefore, we chose to use it in the present study to evaluate the effects of AHG observed during the oral glucose tolerance test (OGTT) on coronary microvascular function, and the associations among changes in the hyperemic response of coronary blood flow velocity (CFV) or coronary flow velocity reserve (CFVR), oxidative stress, and increased sympathetic tone caused by AHG in subjects with atherosclerotic risk factors. Methods SubjectsTwenty-four patients receiving treatment for atherosclerotic risk factors (14 patients with hypertension, 6 with hypercholesterolemia, 3 with hypertension and hypercholesterolemia, and 1 patient with abnormal glucose intolerance) at Tokyo Medical University Hospital were enrolled in this study. None of the patients had any symptoms suggestive of coronary heart disease or changes on the electrocardiogram suggestive of myocardial ischemia. Furthermore, none of them showed any regional wall motion abnormality on echocardiography. Written informed consent was given by all the subjects prior to their participation and the study protocol was approved by the Ethics ComCirc J 2007; 71: 202 -206 (Received June 28, 2006; revised manuscript received September 12, 2006; accepted November 9, 2006) Background The effect of acute hyperglycemia (AHG) during the oral glucose tolerance test (OGTT) on coronary microvascular function was evaluated, as well as the associations among the changes in coronary microvascular functi...

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“…Data recorded in the palm‐sized electrocardiographic unit were analyzed for HRV by the maximum entropy method ( chiram ; Suwa Trust Japan, Japan) (16,21). In the ward, lights‐out time was at 21:00 and wake‐up time at 06:00, so we analyzed the recorded data, defining 21:00–06:00 as stage I and 06:00–08:00 before arrival in the operation room as stage II.…”

Section: Methodsmentioning

confidence: 99%

Maternal heart rate variability just before surgery significantly correlated with emergence behavior of children undergoing general anesthesia

Arai

Ueda

et al. 2007

Pediatric Anesthesia

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Heart Rate Variability in Congestive Heart Failure

Cited by 4 publications

References 14 publications

Increased heart rate variability correlation between mother and child immediately pre‐operation

Increased heart rate variability correlation between mother and child immediately pre‐operation

Close Relationship Between Sympathetic Activation and Coronary Microvascular Dysfunction During Acute Hyperglycemia in Subjects With Atherosclerotic Risk Factors

Maternal heart rate variability just before surgery significantly correlated with emergence behavior of children undergoing general anesthesia

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