Evaluation of a noninvasive method for cardiac output measurement in critical care patients

Abstract

The noninvasive partial CO(2) rebreathing technique may be an alternative method for CO determination in mechanically ventilated critically ill patients. The rebreathing maneuver alone does not induce changes in CO.

Inert gas rebreathing: the effect of haemoglobin based pulmonary shunt flow correction on the accuracy of cardiac output measurements in clinical practice

“…To assess the impact of shunt correction and c Hb on the accuracy of CO measurements by IGR we studied different approaches of shunt correction a large cohort of cardiovascular patients with a wide range of haemoglobin levels and cardiac output states giving a fairly realistic representation of a collective to be surveyed by IGR. When comparing the CO measurements without shunt correction (group A) to CMR an acceptable agreement could already be found being similar to the results obtained by other non‐invasive approaches (Murias et al. , 2002; Rocco et al.…”

“…Alternative tests such as partial CO 2 rebreathing which is based on the Fick Principle have been extensively investigated in recent years and revealed diverse findings. While some investigators found a close agreement with thermodilution (Murias et al. , 2002; Rocco et al.…”

“…Alternative tests such as partial CO 2 rebreathing which is based on the Fick Principle have been extensively investigated in recent years and revealed diverse findings. While some investigators found a close agreement with thermodilution (Murias et al, 2002;Rocco et al, 2004), others could not confirm these data (Nilsson et al, 2001;Neuhauser et al, 2002;Gama deAbreu et al, 2003). Impedance cardiography is based on the electric conductivity of tissues but limited by changes in intrathoracic water content, arrhythmias and movement artefacts (Appel et al, 1986;Franko et al, 1991).…”

Noninvasive Determination of Cardiac Output by the Inert-Gas-Rebreathing Method – Comparison with Cardiovascular Magnetic Resonance Imaging

“…Other tests derived from the Fick principle based on partial CO 2 rebreathing have been extensively investigated in recent years and revealed diverse findings. While some investigators found close agreement with thermodilution [13, 28], others could not confirm these data [10, 14, 29]. Tachibana et al [11] found only poor agreement in spontaneously breathing patients and proposed to restrict this technique to mechanically ventilated patients.…”

Comparison of the Correlation of Rebreathing Method and Echocardiography in Heart Failure Patients With Moderate to Severe Mitral Regurgitation

“…The rebreathing method has also been shown to be accurate and repeatable, not only to Fick 1) but also to thermodilution. 2,18) Conclusion: It is concluded the rebreathing method and velocity-time integral method are excellent noninvasive methods with which to measure cardiac function. They exhibit good correlation, even in these CHF patients with moderate to severe mitral regurgitation.…”