Determination of cardiac output using acoustic quantification in critically III patients

Tardif, Jean‐Claude; Cao, Qi‐Ling; Pandian, Natesa G.; Esakof, Darryl D.; Pollard, H. Marvin

doi:10.1016/0002-9149(94)90441-3

Cited by 27 publications

(8 citation statements)

References 22 publications

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“…LV ejection fraction was quantified by a computerized analysis system using a proprietary software package in the echo unit 12,13 in the LV short-axis view at the mid-papillary muscle level. Collateral flow to the LCx territory was graded angiographically in a blinded manner by use of the Rentrop scoring system.…”

Section: Physiological Assessment Of LV Function and Ischemiamentioning

confidence: 99%

Intramyocardial Transplantation of Autologous Endothelial Progenitor Cells for Therapeutic Neovascularization of Myocardial Ischemia

et al. 2003

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Background-We investigated whether catheter-based, intramyocardial transplantation of autologous endothelial progenitor cells can enhance neovascularization in myocardial ischemia. Methods and Results-Myocardial ischemia was induced by placement of an ameroid constrictor around swine left circumflex artery. Four weeks after constrictor placement, CD31ϩ mononuclear cells (MNCs) were freshly isolated from the peripheral blood of each animal. After overnight incubation of CD31ϩ MNCs in noncoated plates, nonadhesive cells (NA/CD31ϩ MNCs) were harvested as the endothelial progenitor cell-enriched fraction. Nonadhesive CD31Ϫ cells (NA/CD31Ϫ MNCs) were also prepared. Autologous transplantation of 10 7 NA/CD31ϩ MNCs, 10

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Section: Physiological Assessment Of LV Function and Ischemiamentioning

confidence: 99%

Intramyocardial Transplantation of Autologous Endothelial Progenitor Cells for Therapeutic Neovascularization of Myocardial Ischemia

et al. 2003

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“…B. in der postoperativen Phase bei Kindern genutzt werden könnte. Bei Erwachsenen wurde die AQ-Methode durchaus erfolgreich auf Intensivstationen eingesetzt (16,17).…”

Section: Materials Und Methodikunclassified

Echokardiographische On-line-Quantifizierung der linksventrikulären systolischen Funktion bei Kindern: Vergleich mit der konventionellen off-line-Bestimmung

et al. 2000

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Accurate and efficient echocardiographic on-line determination of left ventricular volume would be advantageous in the care of children with congenital heart disease and children with hemodynamic instability. The prospective study was performed to evaluate the clinical usefulness of the on-line automatic border detection system (acoustic quantification: AQ) for determination of left ventricular volumes and ejection fraction in comparison to the conventional off-line method (manual tracing). 107 patients were enrolled in the study. The ages ranged from 0.1 to 18.8 years (mean 8.3 +/- 5.6). All patients were studied in the apical four-chamber plane for acoustic quantification (AQ) and manual tracing as well. Left ventricular volumes were determined using the mono-plane Simpson's rule. Left ventricular end-diastolic volumes obtained by AQ correlated well but were slightly underestimated compared to those determined by manual tracing (r = 0.99). Left ventricular endsystolic volumes by AQ correlated well but were also slightly underestimated compared to those obtained by manual tracing (r = 0.98). Mean ejection fraction was 61.1 +/- 6.8% by AQ compared with 61.5 +/- 5.9% by manual tracing. Linear regression analysis demonstrated good correlation: y = 0.77x + 14.1, r = 0.89; p < 0.001. Measurement of left ventricular volumes and ejection fraction by AQ using automatic border detection compares well with measurements done by manual tracing. However, AQ tends to underestimate to some degree. The time necessary for acquisition of data was similar in both methods. AQ seems to be a promising method for real-time estimation of left ventricular volume, even in children.

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“…This technique uses previously established arealength (AL) or multiple disc (MD) formulae [5][6] and provides the user with digitized information on enddiastolic and end-systolic LV volume. Few transthoracic studies have investigated the potential of ABD methods for rapid on-line calculation of LV stroke volume [7][8][9] . This study was designed to assess the capability of ABD techniques for transoesophageal (TOE) monitoring of LV stroke volume during prolonged surgical procedures.…”

Section: Introductionmentioning

confidence: 99%

On-line estimation of left ventricular stroke volume using transoesophageal echocardiography and acoustic quantification

Greim

Roewer

Laux

et al. 1996

British Journal of Anaesthesia

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We have examined the usefulness of transoesophageal echocardiography (TOE) and automated endocardium detection for on-line calculation of left ventricular stroke volume. In 12 of 15 patients undergoing abdominal surgery, stroke volume was derived continuously from the multiple discs (MD) and area-length (AL) methods and compared with stroke volume calculated by thermodilution. In 10 patients (80%), more than three manipulations of the ultrasound transducer were required before measurements. Linear regression analysis of automated TOE methods and thermodilution revealed weak correlations (r < 0.75) for stroke volume (114 matched pairs) and its changes (105 matched pairs). Correlation of percentage changes in stroke volume calculated by thermodilution with those derived from MD (r = 0.85) and AL (r = 0.79) was better. Changes in MD (AL) derived stroke volume by more than 20% identified changes in thermodilution-derived stroke volume greater than 20% (n = 57) with a sensitivity of 74% (70%) and a specificity of 82% (79%). Signal instability, lack of accuracy and only a moderate trend capability currently limit the intraoperative usefulness of automated TOE techniques for continuous estimation of stroke volume from a single long-axis plane.

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Determination of cardiac output using acoustic quantification in critically III patients

Cited by 27 publications

References 22 publications

Intramyocardial Transplantation of Autologous Endothelial Progenitor Cells for Therapeutic Neovascularization of Myocardial Ischemia

Intramyocardial Transplantation of Autologous Endothelial Progenitor Cells for Therapeutic Neovascularization of Myocardial Ischemia

Echokardiographische On-line-Quantifizierung der linksventrikulären systolischen Funktion bei Kindern: Vergleich mit der konventionellen off-line-Bestimmung

On-line estimation of left ventricular stroke volume using transoesophageal echocardiography and acoustic quantification

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