Real-time monitor for hemodynamic beat-to-beat parameters and power spectra analysis of the biosignals

Fortin, Jürgen; Habenbacher, W.; Gruellenberger, R.; Wach, Paul; Skrabal, F.

doi:10.1109/iembs.1998.745917

Cited by 51 publications

(57 citation statements)

References 6 publications

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“…For monitoring and automatic online calculation of all hemodynamic parameters as well as HRV, we used the Task Force Monitor (CNSystems, Graz, Austria): continuous measurements of systolic (BPsys), diastolic, and mean beat-to-beat BP were obtained by use of the vascular unloading technique on the finger (15). These BP values were automatically and continuously corrected to oscillometric BP values obtained at the contralateral arm (brachial artery).…”

Section: Methodsmentioning

confidence: 99%

“…These BP values were automatically and continuously corrected to oscillometric BP values obtained at the contralateral arm (brachial artery). An estimate of real-time beat-to-beat SV was derived using an improved method of transthoracic impedance cardiography (ICG) (15,16,18). ICG utilizes changes in thoracic electrical impedance to estimate changes in blood volume in the aorta and changes in fluid volume in the thorax (16).…”

Section: Methodsmentioning

confidence: 99%

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Heart rate variability and spontaneous baroreflex sequences in supine healthy volunteers subjected to nasal positive airway pressure

Valipour¹,

Schneider²,

Kössler³

et al. 2005

Journal of Applied Physiology

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. Heart rate variability and spontaneous baroreflex sequences in supine healthy volunteers subjected to nasal positive airway pressure. J Appl Physiol 99: [2137][2138][2139][2140][2141][2142][2143] 2005. First published July 7, 2005; doi:10.1152/japplphysiol.00003.2005.-To determine the dynamic effects of short-term nasal positive airway pressure (nPAP) on cardiovascular autonomic control, continuous recordings of noninvasively obtained hemodynamic measurements and heart rate variability (HRV) were obtained in 10 healthy subjects during frequency-controlled breathing (between 0.20 and 0.24 Hz) in supine posture under different pressures of nPAP ranging from 3 to 20 cmH 2O. HRV was assessed using spectral analysis of the R-R interval. The slope of the regression line between spontaneous systolic blood pressure and pulse interval changes was taken as an index of the sensitivity of arterial baroreflex modulation of heart rate (sequence method). Application of nPAP resulted in a pressure-dependent decrease of cardiac output and stroke volume (P Ͻ 0.05, ANOVA) and in an increase in total peripheral resistance (P Ͻ 0.03, ANOVA). Hemodynamic changes under increasing nPAP were accompanied by a decrease in total power of HRV despite mean R-R interval remaining unchanged. The overall decrease in HRV was accompanied by a reduction across all frequency bands when absolute units were used (P Ͻ 0.01). When the power of low frequency and high frequency was calculated in normalized units, a diminished high frequency and an increased low-to-high frequency ratio were observed (P Ͻ 0.05). Compared with low levels of nPAP, pressure levels of Ͼ10 cmH 2O were associated with a significant decline in the mean slope of spontaneous baroreceptor sequences (P Ͻ 0.04). These findings indicate that short-term administration of nPAP in normal subjects exerts significant alterations in R-R interval variability and spontaneous baroreflex modulation of heart rate. cardiac output; cardiovascular autonomic control; heart-lung interaction RESPIRATION SIGNIFICANTLY INFLUENCES autonomic cardiovascular control (12). During normal breathing, oscillatory changes of left ventricular stroke volume (SV) and arterial blood pressure (BP) are sensed by baroreceptors, which provoke parallel R-R interval changes by means of baroreflex physiology (27). Hemodynamic oscillations during normal (negative pressure) respiration are predominantly due to changes in intrathoracic pressure (ITP) (30). However, little is known about the effects of augmented positive ITP, which occurs with positive airway pressure (PAP) ventilation, on cardiovascular autonomic control. The application of PAP, both invasively or noninvasively, increases ITP and may result in a reduction in cardiac filling pressures (23,29,37,43). A reduction in cardiac filling pressures associated with PAP (or positive end-expiratory pressure) may induce a compensatory increase in vascular resistance to maintain systemic arterial pressure in the face of a reduced cardiac output (CO) (5, 41). The increase in...

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Heart rate variability and spontaneous baroreflex sequences in supine healthy volunteers subjected to nasal positive airway pressure

Valipour¹,

Schneider²,

Kössler³

et al. 2005

Journal of Applied Physiology

View full text Add to dashboard Cite

show abstract

“…Hemodynamic parameters were determined using the Task Force Monitor (CNSystmes Medizintechnik, Graz, Austria; Fortin et al, 1998;Gratze et al, 1998). Analysis included electrocardiogram (ECG), impedance cardiography, beat-to-beat blood pressure by vascular unloading technique (Penaz, 1973) and oscillometric blood pressure.…”

Section: Cardiovascular Hemodynamicsmentioning

confidence: 99%

Resistance exercise combined with KAATSU during simulated weightlessness

Kubota¹,

Takano²,

Tsutsumi³

et al. 2008

Int. J. KAATSU Ttaining Res.

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The application of a gravity-specific stress (e.g. LBNP), in combination with exercise, prevents cardiovascular deconditioning in space flight. KAATSU training is a method to induce blood pooling in capacitance vessels by restricting venous return (as with LBNP) and which when combined with lowintensity resistance (RE) exercise produces remarkable muscle mass and muscle strength gains. The purpose of this study was to investigate the hemodynamic and neurohumonal responses induced by KAATSU in combination with leg RE (30 % 1 RM), during simulated weightlessness (6˚ head-down tilt for 24 h, n=7). Following 24 h bed rest 6˚ head-down tilt, body mass was decreased from 75.3 ± 3.9 to 73.3 ± 3.8 Kg (P<0.01). Blood volume (BV) and plasma volume (PV) were reduced by -4.4 ± 1.4% and -7.9 ± 2.5%, respectively. During RE, BV and PV were significantly decreased; the changes with KAATSU induced a lower-body venous pooling, resulting in a sustained decrease in stroke volume (SV; from 77.0 ± 4.4 ml to 55.9 ± 5.1 ml; P<0.01) that was comparable to resting SV while standing. Consequently, RE heart rate (HR) was greater with KAATSU. The serum concentrations of plasma renin activity (PRA), vasopressin (ADH), noradrenaline (NOR), and lactate were also significantly elevated during RE with KAATSU as compared to control RE. These hemodynamic and neurohumoral responses following head-down tilt and during RE closely approximate the gravity-specific stress observed with LBNP. Thus, when used in combination with RE, KAATSU may be a useful countermeasure in microgravity. Key words: KAATSU training, leg press, bed rest, plasma renin activity, noradrenaline ORIGINAL ARTICLECorrespondence to: Toshiaki Nakajima, MD, Department of Ischemic Circulatory Physiology, KAATSU Training, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, Japan 113-8655 masamasa@pb4.so-net.ne.jp See end of article for authors' affiliations ProtocolSubjects maintained a 24-hour period of bed rest in -6˚head-down tilt position (-6˚bed rest). Transportation and toilet procedures were restricted to the head-down recumbent position. Subjects were allowed to rest on their elbows during meals and could move volitionally but remained horizontal to the bed. Subject's diet, fluid intake, and urine volume were monitored.After 24 h -6˚bed rest, control blood samples were taken. Following bed rest subjects were randomly assigned to one of two groups: one group performed leg press RE without KAATSU, followed by a 2-h rest interval and then repeated the leg press RE with KAATSU ( 150-160 mmHg cuff pressure; Fig.1). The other group performed leg press RE with KAATSU followed by a 2-h rest interval and then repeated the leg press RE without KAATSU. Hemodynamic parameters and venous blood samples were collected prior to, during, and following RE. All exercise was performed in the head-down tilt position. Immediately following RE, the KAATSU was released and hemodynamic parameters and blood samples were again collected during a 5-10 min recovery period. After 60 min recovery, the subjec...

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“…To evaluate hemodynamic parameters, we used the Task Force Monitor (CNSystems Medizintechnik, Graz, Austria) (Gratze et al, 1998;Fortin et al, 1998), which includes surface electrocardiograms (ECG), impedance cardiography (ICG), beat-to-beat blood pressure by vascular unloading technique (Penaz, 1973) and oscillometric blood pressure recording performed on the upper arm. The ECG, impedance signal and beat-to-beat blood pressure was sampled with 1000 Hz each.…”

Section: Measurement Of Hemodynamic Parametersmentioning

confidence: 99%

Hemodynamic and autonomic nervous responses to the restriction of femoral blood flow by KAATSU

Iida

Takano

Meguro

et al. 2005

Int. J. KAATSU Ttaining Res.

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Real-time monitor for hemodynamic beat-to-beat parameters and power spectra analysis of the biosignals

Cited by 51 publications

References 6 publications

Heart rate variability and spontaneous baroreflex sequences in supine healthy volunteers subjected to nasal positive airway pressure

Heart rate variability and spontaneous baroreflex sequences in supine healthy volunteers subjected to nasal positive airway pressure

Resistance exercise combined with KAATSU during simulated weightlessness

Hemodynamic and autonomic nervous responses to the restriction of femoral blood flow by KAATSU

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