Searched for: author%3A%22Wesseling%2C+K.H.%22
(1 - 20 of 34)

Pages

document
Guzik, P. (author), Piskorski, J. (author), Krauze, T. (author), Schneider, R. (author), Wesseling, K.H. (author), Wykrȩtowicz, A. (author), Wysocki, H. (author), TNO Biomedical Instrumentation (author)
Aim: To analyze the correlation of the Poincaré plot descriptors of RR intervals with standard measures of heart rate variability (HRV) and spontaneous baroreflex sensitivity (BRS). A physiological model of changing respiratory rates from 6 to 15 breaths/min provided a wide range of RR intervals for analysis. Material and methods: Beat-to-beat...
article 2007
document
Jellema, W.T. (author), Groeneveld, A.B.J. (author), Wesseling, K.H. (author), Thijs, L.G. (author), Westerhof, N. (author), van Lieshout, J.J. (author)
OBJECTIVE: To establish the heterogeneity of hemodynamic responses to dobutamine in patients with septic shock and to identify the predictive factors of these hemodynamic responses. DESIGN: Prospective study. SETTING AND PATIENTS: A total of 12 patients with septic shock in a tertiary medical intensive care unit. INTERVENTIONS: A 20-min...
article 2006
document
Wykretowicz, A. (author), Guzik, P. (author), Bartkowiak, G. (author), Krauze, T. (author), Kasinowski, R. (author), Dziarmaga, M. (author), Wesseling, K.H. (author), Wysocki, H. (author), TNO Biomedical Instrumentation (author)
Endothelial dysfunction and reduced BRS (baroreflex sensitivity) may be present in patients with CAD (coronary artery disease). The normal fasting glucose level does not exclude abnormal glucose metabolism in patients with CAD. The aim of present study was to evaluate endothelial function and BRS according to glucose metabolism in patients with...
article 2005
document
Gisolf, J. (author), Westerhof, B.E. (author), van Dijk, N. (author), Wesseling, K.H. (author), Wieling, W. (author), Karemaker, J.M. (author), TNO Industrie (author)
Objectives We set out to determine the effect of sublingual nitroglycerin (NTG), as used during routine tilt testing in patients with unexplained syncope, on hemodynamic characteristics and baroreflex control of heart rate (HR) and systemic vascular resistance (SVR). Background Nitroglycerin is used in tilt testing to elicit a vasovagal response...
article 2004
document
van Lieshout, J.J. (author), Toska, K. (author), van Lieshout, E.J. (author), Eriksen, M. (author), Walløe, L. (author), Wesseling, K.H. (author), TNO Biomedical Instrumentation (author)
The proper understanding of the cardiovascular mechanisms involved in complaints of short-lasting dizziness and the evaluation of unexplained recurrent syncope requires continuous monitoring of cardiac stroke volume (SV) in addition to blood pressure and heart rate. The primary aim of the present study was to evaluate a pulse wave analysis...
article 2003
document
Guelen, I. (author), Westerhof, B.E. (author), van der Sar, G.L. (author), van Montfrans, G.A. (author), Kiemeneij, F. (author), Wesseling, K.H. (author), Bos, W.J.W. (author), Gaubius Instituut TNO (author)
Objective: To evaluate three methods aimed at the reconstruction of brachial pressure from non-invasive finger arterial pressure measurements as implemented in the Finometer™, (FMS, Finapres Measurement Systems, Arnhem, Netherlands), the successor to the Finapres™ (TNO Siomedical Instrumentation, Amsterdam, Netherlands). Methods: Finger arterial...
article 2003
document
Wesseling, K.H. (author)
Chemicals/CAS: phenylephrine, 532-38-7, 59-42-7, 61-76-7; Cardiotonic Agents; Phenylephrine, 59-42-7
article 2003
document
TNO Biomedical Instrumentation (author), Kingma, R. (author), Voorde, B.J.ten (author), Scheffer, G.J. (author), Karemaker, J.M. (author), Mackaay, A.J.C. (author), Wesseling, K.H. (author), Lange, J.J.de (author)
Endoscopic thoracic sympathectomy at T2-T4 is an effective and safe treatment for primary axillary and palmar hyperhidrosis and facial blushing refractory to conventional treatment. T2 and T4 ganglia however are in the direct pathway of sympathetic innervation of the heart and part of the vasomotor nerves. In this study we investigate possible...
article 2002
document
Jansen, J.R.C. (author), Schreuder, J.J. (author), Mulier, J.P. (author), Smith, N.T. (author), Settels, J.J. (author), Wesseling, K.H. (author), Technisch Physische Dienst TNO - TH (author)
In three clinical centres, we compared a new method for measuring cardiac output with conventional thermodilution. The new method computes beat-to-beat cardiac output from radial artery pressure by simulating a three-element model of aortic input impedance, and includes non-linear aortic mechanical properties and a self-adapting systemic...
article 2001
document
TNO Biomedical Instrumentation (author), Jellema, W.T. (author), Groeneveld, A.B.Johan (author), van Goudoever, J. (author), Wesseling, K.H. (author), Westerhof, N. (author), Lubbers, M.J. (author), Kesecioglu, J. (author), van Lieshout, J.J. (author)
OBJECTIVE: The purposes of this study were to investigate the hemodynamic changes induced by intermittent manual lung hyperinflation (MHI) and to assess if these changes are adverse enough to warrant prohibition of MHI as a routine procedure in the care of patients with septic shock. DESIGN: The study's design was experimental prospective....
article 2000
document
Castiglioni, P. (author), Parati, G. (author), Omboni, S. (author), Mancia, G. (author), Imholz, B.P.M. (author), Wesseling, K.H. (author), di Rienzo, M. (author), TNO Biomedical Instrumentation (author)
The present study compares the spectral characteristics of 24-h blood pressure variability estimated invasively at the brachial artery level with those estimated by measurement of blood pressure at the finger artery using the non-invasive Portapres device. Broad-band spectra (from 3 x 10<sup>-5</sup> to 0.5 Hz) were derived from both finger and...
article 1999
document
Jellema, W.T. (author), Imholz, B.P.M. (author), Oosting, H. (author), Wesseling, K.H. (author), van Lieshout, J.J. (author), TNO Biomedical Instrumentation (author)
Objective: The aim of this study was to compare beat-to-beat changes in stroke volume (SV) estimated by two different pressure wave analysis techniques during orthostatic stress testing: pulse contour analysis and Modelflow, ie, simulation of a three-element model of aortic input impedance. Methods: A reduction in SV was introduced in eight...
article 1999
document
Harms, M.P.M. (author), Wesseling, K.H. (author), Pott, F. (author), Jenstrup, M. (author), van Goudoever, J. (author), Secher, N.H. (author), van Lieshout, J.J. (author), TNO Biomedical Instrumentation (author)
The relationship between aortic flow and pressure is described by a three-element model of the arterial input impedance, including continuous correction for variations in the diameter and the compliance of the aorta (Modelflow). We computed the aortic flow from arterial pressure by this model, and evaluated whether, under orthostatic stress,...
article 1999
document
Bos, W.J.W. (author), Zietse, R. (author), Wesseling, K.H. (author), Westerhof, N. (author), TNO Biomedical Instrumentation (author)
Background. Arteriovenous (AV) fistulas used for hemodialysis access may affect cardiac load by increasing the preload while decreasing the afterload. In dogs, AV fistulas have also been shown to affect coronary perfusion negatively. We investigated the net effect of AV fistulas on cardiac oxygen supply and demand. Methods. Aortic pressure waves...
article 1999
document
Omboni, S. (author), Parati, G. (author), Castiglioni, P. (author), di Rienzo, M. (author), Imholz, B.P.M. (author), Langewouters, G.J. (author), Wesseling, K.H. (author), Mancia, G. (author), TNO Biomedical Instrumentation (author)
Portapres is a noninvasive, beat-to-beat finger blood pressure (BP) monitor that has been shown to accurately estimate 24-hour intra-arterial BP at normal and high BPs. However, no information is available on the ability of this device to accurately track ambulatory BP variability. In 20 ambulatory normotensive and hypertensive subjects, we...
article 1998
document
Langewouters, G.J. (author), Settels, J.J. (author), Roelandt, R. (author), Wesseling, K.H. (author), Technisch Physische Dienst TNO - TH (author)
In the clinic, blood pressure is measured almost exclusively using non- invasive intermittent techniques, of which the auscultatory (Riva- Rocci/Korotkoff, RRK) and the computerized oscillometric method are most often used. However, both methods only provide a momentary value. In addition, the accuracy is hampered by phenomena such as cuff...
article 1998
document
Imholz, B.P.M. (author), Wieling, W. (author), van Montfrans, G.A. (author), Wesseling, K.H. (author), TNO Biomedical Instrumentation (author)
We review the Finapres technology, embodied in several TNO-prototypes and in the Ohmeda 2300 and 2300e Finapres NIBP. Finapres is an acronym for FINger Arterial PRESsure, the device delivers a continuous finger arterial pressure waveform. Many papers report on the accuracy of the device in comparison with intra-arterial or with noninvasive but...
article 1998
document
de Jong-de Vos Van Steenwijk, C.C.E. (author), Wieling, W. (author), Harms, M.P.M. (author), Wesseling, K.H. (author), TNO Biomedical Instrumentation (author)
1. Fainting is a common phenomenon in young subjects, but the final events before the actual faint are not well known. The aim of the present study was to study the inter-individual variability of haemodynamic events associated with near-fainting in children and teenagers. 2. Sixty-eight healthy subjects (aged 6-16 years) performed a 70°tilt-up...
article 1997
document
Atkins, N. (author), O' Brien, E. (author), Wesseling, K.H. (author), Guelen, I. (author), TNO Biomedical Instrumentation (author)
The most fallible component of blood pressure measurement is the human observer. The traditional technique of measuring blood pressure does not allow the result of the measurement to be checked by independent observers, thereby leaving the method open to bias. In the Sphygmocorder, several components used to measure blood pressure have been...
article 1997
document
de Jong-de Vos Van Steenwijk, C.C.E. (author), Imholz, B.P.M. (author), Wesseling, K.H. (author), Wieling, W. (author), TNO Biomedical Instrumentation (author)
The objective of this study was to determine whether the Valsalva manoeuvre is applicable as a test for neurocardiovascular control in healthy children and teenagers. Sixty-eight 6- to 16-year-old children and teenagers performed two Valsalva manoeuvres in the sitting position. They were instructed to maintain airway pressure (strain) for 15 s...
article 1997
Searched for: author%3A%22Wesseling%2C+K.H.%22
(1 - 20 of 34)

Pages