open access

Vol 14, No 2 (2007)
Review articles
Published online: 2007-03-08
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Impedance cardiography: A valuable method of evaluating haemodynamic parameters

Tomasz Sodolski, Andrzej Kutarski
Cardiol J 2007;14(2):115-126.

open access

Vol 14, No 2 (2007)
Review articles
Published online: 2007-03-08

Abstract

This year marks 40 years since the technique was designed of measuring and monitoring the basic haemodynamic parameters in humans by means of impedance cardiography (ICG), also known as "impedance plethysmography of the chest", "electrical bioimpedance of the chest" or "reocardiography". The method makes it possible to denote stroke volume and cardiac output. It also enables the factors to be assessed that influence the following: preload (measurement of thoracic fluid content), afterload (measurement of systemic vascular resistance), the systemic vascular resistance index, contractibility (measurement of the acceleration index), the velocity index, the pre-ejection period, left ventricular ejection time, systolic time ratio and heart rate. Advances in hardware and software, including digital signal tooling and new algorithms, have certainly improved the quality of the results obtained. The accuracy and repeatability of the results have been confirmed in comparative studies with results obtained through invasive methods and echocardiography. Not only are haemodynamic changes monitored by means of ICG in intensive care units, in operating theatres and at haemodialysis stations, but repeated measurements also provide haemodynamic information during the treatment of patients with hypertension and heart failure and pregnant women with cardiological problems and gestosis. A single ICG investigation makes a great contribution to the basic information available about the circulatory system, which is helpful in the initial evaluation of patients in a severe general condition (for example in the admission room), and also makes it possible to make a swift diagnosis of the cause of complaints such as dyspnoea and hypotonia. A particular application of ICG is the assessment of haemodynamic parameters during the programming of atrioventricular and CRT pacemakers. Besides these uses, ICG is a valuable investigative tool. It is defect-free and does not have pulmonary artery pressure monitoring limitations. Moreover, it is not as time-consuming as echocardiography and the examination can be performed by trained technicians or nurses. (Cardiol J 2007; 14: 115-126)

Abstract

This year marks 40 years since the technique was designed of measuring and monitoring the basic haemodynamic parameters in humans by means of impedance cardiography (ICG), also known as "impedance plethysmography of the chest", "electrical bioimpedance of the chest" or "reocardiography". The method makes it possible to denote stroke volume and cardiac output. It also enables the factors to be assessed that influence the following: preload (measurement of thoracic fluid content), afterload (measurement of systemic vascular resistance), the systemic vascular resistance index, contractibility (measurement of the acceleration index), the velocity index, the pre-ejection period, left ventricular ejection time, systolic time ratio and heart rate. Advances in hardware and software, including digital signal tooling and new algorithms, have certainly improved the quality of the results obtained. The accuracy and repeatability of the results have been confirmed in comparative studies with results obtained through invasive methods and echocardiography. Not only are haemodynamic changes monitored by means of ICG in intensive care units, in operating theatres and at haemodialysis stations, but repeated measurements also provide haemodynamic information during the treatment of patients with hypertension and heart failure and pregnant women with cardiological problems and gestosis. A single ICG investigation makes a great contribution to the basic information available about the circulatory system, which is helpful in the initial evaluation of patients in a severe general condition (for example in the admission room), and also makes it possible to make a swift diagnosis of the cause of complaints such as dyspnoea and hypotonia. A particular application of ICG is the assessment of haemodynamic parameters during the programming of atrioventricular and CRT pacemakers. Besides these uses, ICG is a valuable investigative tool. It is defect-free and does not have pulmonary artery pressure monitoring limitations. Moreover, it is not as time-consuming as echocardiography and the examination can be performed by trained technicians or nurses. (Cardiol J 2007; 14: 115-126)
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Keywords

impedance cardiography; electrical bioimpedance of the chest; reocardiography; cardiac output; haemodynamics; non-invasive diagnostics

About this article
Title

Impedance cardiography: A valuable method of evaluating haemodynamic parameters

Journal

Cardiology Journal

Issue

Vol 14, No 2 (2007)

Pages

115-126

Published online

2007-03-08

Bibliographic record

Cardiol J 2007;14(2):115-126.

Keywords

impedance cardiography
electrical bioimpedance of the chest
reocardiography
cardiac output
haemodynamics
non-invasive diagnostics

Authors

Tomasz Sodolski
Andrzej Kutarski

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