Measuring Cardiac Output By Electrical Bioimpedance

Electrical bioimpedance is a method used to determine stroke volume and cardiac output from thoracic tissue resistance to an imposed alternating electric current. The basic rationale for the use of electrical bioimpedance for the measurement of cardiac output is that the procedure is mechanically noninvasive. Information obtained from a review of the litera- ture, responses to a Federal Register notice of this assessment, PHS agencies, and medical specialty groups suggested that despite the obvious potential advantages of electrical bioimpedance, the technique has not been validated in a trail with a statistically satisfactory number of subjects. In addition, the potential electrical effects of long-term monitoring have not been studied, and the precision and accuracy of this technology in severely ill patients has not been compared to standard techniques of measuring cardiac support.

This is the newest volume in the softcover series "Update in Intensive Care Medicine". It takes a novel, practical approach to analyzing hemodynamic monitoring, focusing on the patient and outcomes based on disease, treatment options and relevance of monitoring to direct patient care. It will rapidly become a classic in the approach to patient monitoring and management during critical illness.

This book offers a comprehensive overview of the basic physiology of the cardiac and pulmonary systems, tools for cardiopulmonary monitoring, and related issues in the management of specific conditions. The volume is divided into three main parts. The first part examines the functional basis of normal and abnormal physiology, organized into cardiac and pulmonary units and followed by a “combined” interactive component. The next section discusses cardiopulmonary monitoring tools and variables and is also divided into cardiac (e.g, echocardiography, heart rate, cardiac output), pulmonary (e.g, lung volume, pleural pressure, electrical impedance tomography), and combined tools such as radiology/MRI and tissue perfusion tests. The third section concerns the management and application of specific clinical problems such as pulmonary hypertension, cardiac shunts, cardiogenic shock, and ECMO with an emphasis on the physiological basics. /div Cardiopulmonary Monitoring: Basic Physiology, Tools, and Bedside Management for the Critically Ill is an essential resource for physicians, residents, fellows, medical students, and researchers in cardiology, critical care, emergency medicine, anesthesiology, and radiology.

Here's a source of guidance on the analysis of the hemodynamic waveforms generated in the cardiac catheterization lab. It progresses from a review of basic monitoring principles and normal waveforms through an assessment of the waveform data associated with the full range of individual coronary diseases, providing the assistance needed to accurately interpret any findings encountered in practice. Its extremely clinically oriented approach makes it an ideal hands-on tool for any clinician involved in diagnosing cardiac problems using interventional cardiology.

This book deals with the possibility of using impedance cardiography for calculation of cardiac output. Kubicek's, Sramek's and Sramek-Bernstein's methods are discussed here. These methods were applied to a data set, obtained by measuring on subjects with implanted pacemakers. The subjects' heart rate was being changed by the programming of pacemakers. Thanks to this procedure the measured data were not affected by artifacts, connected with the heart rate change caused by a body stress, or other influences. An influence of heart rate on a cardiac output value based on the statistical processing of the data set was studied.

This book, part of the European Society of Intensive Care Medicine textbook series, teaches readers how to use hemodynamic monitoring, an essential skill for today’s intensivists. It offers a valuable guide for beginners, as well as for experienced intensivists who want to hone their skills, helping both groups detect an inadequacy of perfusion and make the right choices to achieve the main goal of hemodynamic monitoring in the critically ill, i.e., to correctly assess the cardiovascular system and its response to tissue oxygen demands. The book is divided into distinguished sections: from physiology to pathophysiology; clinical assessment and measurements; and clinical practice achievements including techniques, the basic goals in clinical practice as well as the more appropriate hemodynamic therapy to be applied in different conditions. All chapters use a learning-oriented style, with practical examples, key points and take home messages, helping readers quickly absorb the content and, at the same time, apply what they have learned in the clinical setting. The European Society of Intensive Care Medicine has developed the Lessons from the ICU series with the vision of providing focused and state-of-the-art overviews of central topics in Intensive Care and optimal resources for clinicians working in Intensive Care.