Determination of cardiac output during positive endexpiratory pressure—Noninvasive electrical bioimpedance compared with standard thermodilution

Castor, G.; Molter, G.; Helms, J.; Niedermark, I.; Altmayer, P

doi:10.1097/00003246-199005000-00017

Cited by 43 publications

(18 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Several authors have assessed impedance cardiography during anaesthesia and surgery. In peripheral surgery, such as neurosurgery, the BoMed NCCOM3 performs acceptably when compared with thermodilution, with limits of agreement of Ϯ 20-30% [20,28]. Poorer correlation has been found during abdominal surgery, which has been discussed previously [11,40].…”

Section: Clinical Applicationsmentioning

confidence: 96%

“…The findings from these studies have been variable. In patients who have suffered acute myocardial infarction [26], undergoing cardiac catheterisation [27] or neurosurgery [20,28], agreement with thermodilution has been acceptable (Ϯ 20-30%). However, unacceptable limits of agreement of Ϯ 40-60% have been repeatedly found in critically ill patients [29][30][31].…”

Section: A Summary Of Evaluation Studiesmentioning

confidence: 99%

See 1 more Smart Citation

Impedance cardiographyThe impact of new technology

Critchley

1998

Anaesthesia

View full text Add to dashboard Cite

SummaryThe 1990s have witnessed major advances in impedance cardiography technology. Problems existed with the methods used to calculate cardiac output. Excessive lung fluid, as often found in critically ill patients, may also invalidate measurements. The signal processing and measurement techniques used in older systems were deficient. The newer systems, of which there are at least six, incorporate novel and improved signal processing techniques. They also offer analog visual displays, personal computer interfacing, sophisticated analytical software and haemodynamic patient management systems. Evaluation of these systems is difficult because no true 'gold standard' method of cardiac output measurement exists. When compared with thermodilution techniques, limits of agreement of Ϯ 20-30% seem acceptable. These limits can be achieved in normal subjects but not in critically ill patients. Validation data are available for only half of the new systems. Until recently, the main application for impedance cardiography has been research but improved accuracy should lead to increased clinical usage.

show abstract

Section: Clinical Applicationsmentioning

confidence: 96%

Section: A Summary Of Evaluation Studiesmentioning

confidence: 99%

Impedance cardiographyThe impact of new technology

Critchley

1998

Anaesthesia

View full text Add to dashboard Cite

show abstract

“…Castor and colleges in their study find that TEB is an accurate and reproducible method for determination of cardiac output under these changing respiratory patterns during artificial ventilation. (8) There are many studies that compare TEB and direct Fick cardiac output methods. In a prospective study, Van DeWater et al (9) compared the accuracy of TEB to thermodilution (CO-TD) in postoperative coronary artery bypass graft (CABG) patients.…”

Section: ∆Z ≈ ∆Vmentioning

confidence: 99%

Thoracic electrical bioimpedance theory and clinical possibilities in perioperative medicine

2008

View full text Add to dashboard Cite

show abstract

“…24 Positive end-expiratory pressure (PEEP), a maneuver frequently applied to mechanical ventilation, also affects TDCO values. Castor et al 26 demonstrated a 6% reduction in TDCO values when PEEP was applied to sick patients (American Society of Anesthesia grade 3 or 4) undergoing neurosurgery. Concurrently measured impedance cardiac output measurements in the same patients produced only a 2% reduction in values, suggesting that PEEP adversely affects thermodilution over and above its direct effect on cardiac output.…”

Section: Figure 1 Agreement Between Impedance and Thermodilution Carmentioning

confidence: 99%

Improving the Accuracy of Impedance Cardiac Output in the Intensive Care Unit: Comparison With Thermodilution Cardiac Output

Fuller

2006

Congestive Heart Failure

View full text Add to dashboard Cite

This study examined the effect of impedance algorithm adjustment to reflect abnormalities found in cardiac output estimation in the intensive care unit. Impedance (Kubicek and Sramek equations) and thermodilution were measured concurrently in 61 patients. The mean difference between Kubicek and thermodilution (n=40) was 1.47 L/min (95% confidence interval [CI], 0.47–2.47) and between Sramek and thermodilution (n=54) was 2.68 L/min (95% CI, 1.93–3.44). Exclusion of patients with valve regurgitation improved agreement between Kubicek and thermodilution (n=32), with a mean difference of 2.02 L/min (95% CI, 1.10–2.94). Multiple regression determined the role of skinfold thickness, pH, hematocrit, sodium, chloride, albumin, protein, and urea within impedance. Kubicek was recalculated using the new algorithm and recompared with thermodilution. The mean difference was −0.38 L/min (95% CI, −1.92 to 1.16). This study found poor agreement between impedance and thermodilution in critically ill patients, but exclusion of those with valve regurgitation and adjustment for hematocrit and skinfold thickness improved agreement.

show abstract

Determination of cardiac output during positive endexpiratory pressure—Noninvasive electrical bioimpedance compared with standard thermodilution

Cited by 43 publications

References 0 publications

Impedance cardiographyThe impact of new technology

Impedance cardiographyThe impact of new technology

Thoracic electrical bioimpedance theory and clinical possibilities in perioperative medicine

Improving the Accuracy of Impedance Cardiac Output in the Intensive Care Unit: Comparison With Thermodilution Cardiac Output

Contact Info

Product

Resources

About