Left ventricular function at similar heart rates during tachycardia induced by exercise and atrial pacing: an echocardiographic study.

Piérard, Luc; Serruys, P.W.; Roelandt, J; Meltzer, Richard S.

doi:10.1136/hrt.57.2.154

Cited by 20 publications

(5 citation statements)

References 30 publications

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“…Leg raising is one of the factors that distinguish upright and supine exercise, and is used to predict volume responsiveness and to increase blood pressure (BP) in hypotensive patients [10][11][12]. PLR evokes a number of cardiorespiratory changes as a consequence of intrathoracic blood pooling and baroreceptor activation [1,3,13].…”

Section: Introductionmentioning

confidence: 99%

The effects of passive leg raising on arterial wave reflection in healthy adults

Kamran

Salciccioli

Gusenburg

et al. 2009

Blood Pressure Monitoring

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Section: Introductionmentioning

confidence: 99%

The effects of passive leg raising on arterial wave reflection in healthy adults

Kamran

Salciccioli

Gusenburg

et al. 2009

Blood Pressure Monitoring

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“…In both stress modalities, the reduction of left ventricular cavity was probably dependent on the decrease in preload decrease induced by increasing heart rate. [8][9][10] Despite the higher occurrence of pseudohypertrophy in left ventricular regions at risk of ischemia (circum ex coronary artery-related area), the increase in diastolic wall thickness did not correlate with coronary stenosis severity, as evaluated by luminal diameter reduction and stress test positivity, which suggests that pseudohypertrophy was not related to myocardial ischemia in this animal model.…”

Section: Discussionmentioning

confidence: 68%

Is Left Ventricular Diastolic Thickening Documented During Dobutamine and Pacing Stress Echocardiography Related to Myocardial Ischemia? An Animal Model Study

et al. 2002

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Transient increase in diastolic wall thickness (pseudohypertrophy) during pacing stress echocardiography has been reported in normal myocardium. To evaluate the occurrence of pseudohypertrophy and to investigate the contribution of myocardial ischemia on its production during pacing and dobutamine stress echocardiography, we produced a physiologically significant coronary stenosis in 14 open chest dogs. The stenosis in the circumflex artery was measured by quantitative coronary angiography (range: 50% to 89% reduction in luminal diameter), and no resting segmental wall-motion abnormalities were observed by epicardial echocardiography (short-axis, papillary level). In each study, dobutamine (5-40 microg/kg/min) and pacing (up to 260 beats/min) were performed randomly. Positivity of stress echocardiography tests was quantitatively determined by a significant (P < 0.05) reduction or failure to increase in absolute and percent systolic wall thickening in the myocardial area supplied by the stenotic artery as compared to the left anterior descending (LAD) artery-related areas. Diastolic wall thickness and left ventricular diastolic area were compared before and after each stress test in the circumflex and LAD artery-related regions. Pseudohypertrophy was observed in 57% and 86% of dogs for pacing and dobutamine, respectively, in the circumflex region, and in 50% and 64% in the LAD region. Despite its increased incidence in the circumflex region, the augmented diastolic wall thickness did not correlate with coronary stenosis severity or stress test positivity, but correlated inversely with changes in left ventricular diastolic area. In addition, it correlated directly with changes in heart rate only for pacing. In conclusion, pseudohypertrophy was a frequent finding during pacing and dobutamine stress echocardiography tests but was not related to myocardial ischemia in this animal model.

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“…In order to minimize a possible influence of the heart rate on left ventricular dimensions, as is described in humans 24 , echocardiography was performed within 2 min after exercise and with the heart rate at about 100 bpm, as described by other authors. Such examination procedure requires an experienced examiner who is confident with echocardiographic techniques and who has examined the horse echocardiographically at rest before exercise was carried out.…”

Section: Discussionmentioning

confidence: 99%

Echocardiographic comparison of left ventricular dimensions and function after standardized treadmill exercise in trained and untrained healthy warmblood horses

Gehlen

Marnette

Rohn

et al. 2006

Equine Comp. Exerc. Physiol.

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The purpose of the present study was to determine the influence of fitness on cardiac function, particularly on left ventricular function parameters. Fifteen healthy ‘three-day event’ warmblood horses were examined at rest and immediately after high-speed treadmill exercise (3% incline, 3 min 1.8 m s−1, 3 min 4 m s−1, 3 min 5 m s−1, 3 min 6 and 3 min 7 m s−1, 1.5 min 8 m s−1). Horses were divided into two groups. Group 1 consisted of nine conditioned horses and group 2 included six unconditioned horses. Left ventricular dimensions and function were acquired using standardized echocardiographic indices. To assess the level of fitness, heart rate and blood lactate concentration were determined at rest and immediately after exercise. The group of conditioned horses showed a significantly lower blood lactate concentration (mean value 2.39 mmol l−1) after high-speed treadmill exercise than did the group of unconditioned horses (mean value 3.81 mmol l−1), which clearly revealed the difference in fitness between the two groups. During exercise the heart rate was not significantly different between both groups. Only in the recovery phase did the trained horses show a significant faster decrease in heart rate than did the untrained horses. Mean heart rate during echocardiography immediately after exercise (within the first 2 min) was 105 bpm in the group of trained horses and 113 bpm in the group of untrained horses.Within each group of horses, several echocardiographic parameters differed significantly between resting values and values after treadmill exercise. Particularly, in the group of trained horses, 17 out of 30 echocardiographic parameters (most diastolic) differed significantly between rest and exercise. In the group of untrained horses, only six out of 30 parameters were significantly different. At rest, left ventricular diameter at the apex cordis, left ventricular free wall at papillary muscle level, left ventricular volume and stroke volume, as well as fractional shortening (at the apex cordis and at papillary muscle level) were significantly different between both groups. After treadmill exercise comparison of echocardiographic parameters of the conditioned to those of the unconditioned animals showed no significant differences. In the present study, data have been provided for stress echocardiography in conditioned and unconditioned warmblood horses without any disorders of the cardiovascular system.

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Left ventricular function at similar heart rates during tachycardia induced by exercise and atrial pacing: an echocardiographic study.

Cited by 20 publications

References 30 publications

The effects of passive leg raising on arterial wave reflection in healthy adults

The effects of passive leg raising on arterial wave reflection in healthy adults

Is Left Ventricular Diastolic Thickening Documented During Dobutamine and Pacing Stress Echocardiography Related to Myocardial Ischemia? An Animal Model Study

Echocardiographic comparison of left ventricular dimensions and function after standardized treadmill exercise in trained and untrained healthy warmblood horses

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