Continuous measurement of left ventricular volume in animals and humans by conductance catheter.
It is concluded that the conductance catheter provides a reliable and simple method to measure left ventricular volume, giving an on-line, time-varying signal that is easily calibrated.
Continuous stroke volume and cardiac output from intra-ventricular dimensions obtained with impedance catheter.
- J. BaanT. A. Jong J. Koops
- 1 June 1981
Engineering, Medicine
The catheter, which has great potential for application in man, fulfills its primary aim of continuously recording stroke volume and cardiac output.
Photo-analysis of the condition of implanted pacemakers and electrode circuits. I.
- J. van den BergF. RodrigoH. ThalenJ. Koops
- 1967
Medicine
Technical aspects and clinical results of an esophageal pick-up for better recording of posteriorly generated heart sounds.
- J. G. ChinH. VermariënJ. KoopsE. van VollenhovenP. J. Voogd
- 1986
Engineering, Medicine
In 3 patients with artificial valves in the aortic and mitral orifices (where left heart catheterisation and left ventricular angiography is a considerable risk), the esophageal microphone improved the postoperative evaluation and diagnosis of mitral valve regurgitation considerably.
Mitral Valve Prolapse: A Comparative Study with Two-Dimensional and Doppler Echocardiography, Auscultation, Conventional and Esophageal Phonocardiography
- J. J. ChinG. Herpen E. Vollenhoven
- 1992
Medicine
Circulatory effects of body acceleration given synchronously with the heartbeat.
- A. ArntzeniusJ. KoopsF. RodrigoH. Elsbach
- 1 November 1969
Medicine
British heart journal
Technical improvements on biaxial esophageal heart vibration recording (ePCG).
- H. VermariënJ. G. ChinE. van VollenhovenJ. JacquelootD. VandewoudeJ. Koops
- 1988
Engineering, Medicine
Origin of the components of the first heart sound studied by biaxial esophageal phonocardiography.
- J. G. ChinH. VermariënE. van VollenhovenJ. KoopsP. J. VoogdA. Bruschke
- 1988
Medicine, Physics
Photo-analysis of the condition of implanted pacemakers and electrode circuits. II.
- J. van den BergF. RodrigoH. ThalenJ. Koops
- 1967
Medicine
The origins of innocent murmurs detected by esophageal phonocardiography (ePCG).
In this research with a small biaxial esophageal microphone (EM) the opportunity to record heart vibrations near the origin is offered, and electronic axis rotation can be performed so that optimal recording is received.
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