A new stroke volume equation for thoracic electrical bioimpedance

Bernstein, Donald P.

doi:10.1097/00003246-198610000-00017

Cited by 431 publications

(222 citation statements)

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“…This was connected to the volunteer according to the manufacturer's instructions using four neck and four lower thoracic electrodes [5]. The method used to derive cardiac output has been described previously [6,71. Data were indexed to the volunteers' body surface area and the average of 16 beats was recorded.…”

Section: Methodsmentioning

confidence: 99%

The effect of four different surgical prone positions on cardiovascular parameters in healthy volunteers

1996

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Section: Methodsmentioning

confidence: 99%

The effect of four different surgical prone positions on cardiovascular parameters in healthy volunteers

1996

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“…From this impedance waveform an estimate of cardiac stroke volume can be determined if a thoracic geometrical constant is available [22]. Accurate CO values also depend upon assumptions regarding the patient's shape and ideal body weight [2]. Clearly these and potentially other factors are responsible for the poor limits of agreement in our studies.…”

Section: Discussionmentioning

confidence: 96%

Minimally Invasive Determination of Cardiac Output by Transthoracic Bioimpedance, Partial Carbon Dioxide Rebreathing, and Transesophageal Doppler Echocardiography in Beagle Dogs

Yamashita

Ueyama

Miyoshi

et al. 2007

The Journal of Veterinary Medical Science

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ABSTRACT. Minimally invasive cardiac output was determined using transthoracic bioimpedance (BICO), partial carbon dioxide rebreathing (NICO) and transesophageal Doppler echocardiography (TEECO) and compared to thermodilution (TDCO) in 6 beagle dogs. The dogs were 2 years old, weigh between 9.1-13.0 kg and were anesthetized with nitrous oxide-oxygen-sevoflurane. All dogs were administered a neuromuscular blocking drug and artificially ventilated during anesthesia. Thirty paired measurements of TDCO and each noninvasive method were collected during low, intermediate, and high values of cardiac output achieved by varying the depth of anesthesia and the administration of dobutamine. Cardiac output values ranged from 1.10-2.50 L/min for BICO compared to 0.81-4.88 L/min for TDCO; 0.70-2.60 L/min for NICO compared to 0.89-4.45 L/min for TDCO; and 0.59-4.37 L/min for TEECO compared to 0.57-4.15 L/min for TDCO. The limits of agreement and percentage error were -0.58 ± 1.56 L/min and ± 75.4% for BICO, -1.04 ± 1.08 L/min and ± 56.0% for NICO, and 0.03 ± 0.26 L/min and ± 12.3% for TEECO compared to TDCO. In conclusion, TEECO provided the best agreement to TDCO in sevoflurane anesthetized beagle dogs. KEY WORDS: beagle dog, cardiac output, minimally invasive measurement.

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“…4,7,8 In his original model, Kubicek used the simple assumption of the thorax as a cylinder of crosssectional area (A) and length (L) that would serve as an electrically nonhomogeneous bulk conductor of some constant injected current circuit. The human thorax is composed of mostly muscle, lung, fat, skin, bone, and air; all of which have very high resistivity (R ¼ 200-5,000 V cm).…”

Section: Electrophysiologic Principles and Theory Of Stroke Volume Dementioning

confidence: 99%

Bench to Bedside: Electrophysiologic and Clinical Principles of Noninvasive Hemodynamic Monitoring Using Impedance Cardiography

Summers

Shoemaker

Peacock

et al. 2003

Academic Emergency Medicine

114

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The evaluation of the hemodynamic state of the severely ill patient is a common problem in emergency medicine. While conventional vital signs offer some insight into delineating the circulatory pathophysiology, it is often impossible to determine the true clinical state from an analysis of blood pressure and heart rate alone. Cardiac output measurements by thermodilution have been the criterion standard for the evaluation of hemodynamics. However, this technology is invasive, expensive, time-consuming, and impractical for most emergency department environments. Impedance cardiography (ICG) is a noninvasive method of obtaining continuous measurements of hemodynamic data such as cardiac output that requires little technical expertise. ICG technology was first developed by NASA in the 1960s and is based on the idea that the human thorax is electrically a nonhomogeneous, bulk conductor. Variation in the impedance to flow of a high-frequency, low-magnitude alternating current across the thorax results in the generation of a measured waveform from which stroke volume can be calculated by a modification of the pulse contour method. To adequately judge the possible role of this technology in the practice of emergency medicine, it is important to have a sufficient understanding of the basic scientific principles involved as well as the clinical validity and limitations of the technique.

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A new stroke volume equation for thoracic electrical bioimpedance

Cited by 431 publications

References 0 publications

The effect of four different surgical prone positions on cardiovascular parameters in healthy volunteers

The effect of four different surgical prone positions on cardiovascular parameters in healthy volunteers

Minimally Invasive Determination of Cardiac Output by Transthoracic Bioimpedance, Partial Carbon Dioxide Rebreathing, and Transesophageal Doppler Echocardiography in Beagle Dogs

Bench to Bedside: Electrophysiologic and Clinical Principles of Noninvasive Hemodynamic Monitoring Using Impedance Cardiography

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