Journal ArticleDOI
An esophageal Doppler probe for aortic flow velocity monitoring.
Reads0
Chats0
TLDR
An ultrasonic Doppler transducer suitable for intra-esophageal use in humans has been constructed, tested, and its function as a flow monitoring device assessed on a series of 15 unselected anaesthetized human subjects undergoing surgery.Abstract:
An ultrasonic Doppler transducer suitable for intra-esophageal use in humans has been constructed, tested, and its function as a flow monitoring device assessed on a series of 15 unselected anaesthetized human subjects undergoing surgery. Doppler flow signals from the descending thoracic aorta have been obtained in all cases. Once correctly positioned, the probe can give continuous qualitative monitoring of pulsatile aortic blood flow velocity for extended periods. It is possible to observe flow waves in the descending thoracic aorta from the aortic arch distally for about 20 cm and observe the change from disturbed to laminar flow patterns over this length.read more
Citations
More filters
Patent
Methods and apparatus for monitoring cardiac output
TL;DR: In this article, a method and apparatus for ascertaining the cardiac output of a human patient, comprising the steps of: measuring the systolic velocity of the blood flowing through the patient's descending aorta, determining the cross-sectional area of the patient ascending aortal area, and calculating the patient cardiac output from said systatolic velocity and said aortic area.
PatentDOI
Omnidirectional ultrasonic probe
TL;DR: An omnidirectional ultrasonic probe, having specific application for connection to the distal end of an esophageal catheter, includes a support member upon which are coaxially mounted a transmitter member, a receiver member, and one or more acoustic reflector members as discussed by the authors.
Journal ArticleDOI
Transesophageal Phased Array for Imaging the Heart
TL;DR: The design and realization of the phased array for imaging the heart through the esophagus is described and some clinical results obtained on patients are presented.
Journal ArticleDOI
Clinical review: Does it matter which hemodynamic monitoring system is used?
TL;DR: There is still a big gap between clinical research studies evaluating these monitors and clinical practice, and the corpus of science related to this topic does not yet fit the standard of clinical research methodology encountered in other specialties such as cardiology and oncology.
Journal ArticleDOI
Perioperative transoesophageal echocardiography: current status and future directions
TL;DR: Transoesophageal echocardiography is used in the perioperative arena to monitor patients during life-threatening emergencies, cardiac and high-risk non-cardiac surgeries, and dynamic cardiac anatomy can be displayed with a physiological perspective.
References
More filters
Journal ArticleDOI
Pressure-flow relationships and vascular impedance in man
C. J. Mills,I. T. Gabe,James H. Gault,Dean T. Mason,John Ross,Eugene Braunwald,J. P. Shillingford +6 more
TL;DR: Blood pressure and velocity waveforms were recorded in a series of patients at cardiac catheterization and the changes in shape of the waveforms are interpreted in terms of reflections and are related to computations of vascular input impedance.
Journal ArticleDOI
Doppler echocardiography. The localization of cardiac murmurs.
TL;DR: A range-gated pulsed Doppler flowmeter has recently been developed that measures the average velocity of blood flow within a small tear-drop shaped sample volume and the localization depends on the detection of turbulent flow or jets at the sampling site.
Journal ArticleDOI
Non-surgical assessment of cardiac function.
C D Side,R. G. Gosling +1 more
TL;DR: CARDIAC catheterization to evaluate myocardial or valvular function should not be used in the seriously ill patient and is difficult in the infant and its use is justified for neither periodic screening examinations nor for routine monitoring at surgery.
Journal ArticleDOI
Pressure-flow studies in man. An evaluation of the duration of the phases of systole
TL;DR: The results indicate that the duration of ejection bears a close direct linear relationship to stroke volume while heart rate has only a weak but independent relation and the durationof total systole is related chiefly to the heart rate but stroke volume exerts an important independent effect.
Journal ArticleDOI
Non-injurious ultrasonic technique for observing flow in the human aorta.
TL;DR: From it could be derived the acceleration during early systole, a good index of myocardial strength and coordination and the integral under the flow/time curve, a measure of cardiac output and body perfusion.