Where to place the Doppler sample volume in the human main pulmonary artery: evaluated from magnetic resonance phase velocity maps

Sloth, Erik; Houlind, Kim Christian; Em, Pedersen; Jm, Hasenkam

doi:10.1016/s0008-6363(96)00175-7

Cited by 4 publications

(2 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…equal flow velocity distribution across the valvular orifices). However, it has been demonstrated in previous studies that the velocity profiles of transvalvular flows in normal subjects show a variable degree of skew [24, 25]. This assumption might result in up to 50% overestimation of the cardiac output through the aortic valve and up to 64% overestimation through the mitral valve [22, 23, 26–29].…”

Section: Discussionmentioning

confidence: 99%

Transoesophageal echocardiography is unreliable for cardiac output assessment after cardiac surgery compared with thermodilution*

Béttex

Hinselmann²,

Hellermann

et al. 2004

Anaesthesia

View full text Add to dashboard Cite

SummaryThis randomised, single-blind, double-control study compared and established prospectively the best transoesophageal echocardiography methods for determining cardiac output in patients after cardiac surgery. Thirty patients undergoing coronary artery bypass grafting were included. Measurements were taken postoperatively, after stabilisation in the intensive care unit. Cardiac output was determined by transoesophageal echocardiography in randomised order through the aortic, mitral, and pulmonary valves, right and left ventricular outflow tracts, transgastric surface areas of the left ventricle and left ventricle two-dimensional volumes (Simpson's rules). 'Eyeball guessing' was done off-line. The best results were transaortic measurements using the triangular shape assumption of valve opening, but some values deviated considerably, and none of these approaches reached the limit of agreement set at 30% when compared to thermodilution. Eyeball guessing was comparable to the best transoesophageal echocardiography measurements. We conclude that transoesophageal echocardiography is an unreliable tool for determination of cardiac output in intensive care after cardiac surgery.

show abstract

Section: Discussionmentioning

confidence: 99%

Transoesophageal echocardiography is unreliable for cardiac output assessment after cardiac surgery compared with thermodilution*

Béttex

Hinselmann²,

Hellermann

et al. 2004

Anaesthesia

View full text Add to dashboard Cite

show abstract

“…A reliable measure requires assessment of the velocity profile (9,10), insonation angle (11) and accurate estimation of the cross-sectional area (CSA) (12). Of these parameters, estimation of CSA based on measurement of one diameter is considered to be the prime source of error (13,14).…”

mentioning

confidence: 99%

Diameter and Cross-sectional Area Relationship of the Human Main Pulmonary Artery: Evaluated by Epicardial Echocardiography

Sloth

Veien²,

Hh³

et al. 1998

Scandinavian Cardiovascular Journal

View full text Add to dashboard Cite

Correct assessment of vessel cross-sectional area (CSA) is essential for reliable cardiac output (CO) measurements by means of pulsed Doppler echocardiography. In 23 patients who underwent coronary artery bypass grafting (CABG) the main pulmonary artery CSA and diameter changes were assessed by epicardial two-dimensional echocardiography using a 7.5 MHz cm2 transducer. Our data indicate that the shape of the pulmonary artery changes over time. Time averaged CSA ranged from 3.51 to 8.29 cm2 (mean 5.04 cm2; SD 1.3 cm2) and the distensibility varied from 13% to 33% (mean 23%; SD 5%). The limits of agreement for the CSA calculated from the most suitable diameter (when assuming vessel circularity) and the corresponding traced CSA (reference value) during peak systole were -0.16 +/- 0.56 cm2 (mean +/- 2SD). In this idealized set-up (not clinically implementable) the maximal discrepancy between the calculated and traced CSA was 12% and 17% during peak systole and diastole, respectively. Therefore, a potential error in CO determination is incurred if CSA is assessed from a single diameter.

show abstract

The impact of ischemic heart disease on main pulmonary artery blood flow patterns: a comparison between magnetic resonance phase velocity mapping and transesophageal color Doppler

Sloth

Kruse

Houlind

et al. 1997

Cardiovascular Research

View full text Add to dashboard Cite

MR-phase velocity mapping and multiplane transesophageal color Doppler recordings provided similar blood velocity patterns in patients with ischemic heart disease. The skewness of the mean temporal blood velocity profile is enhanced compared with healthy subjects, resulting in error in the assessment of CO by means of pulsed Doppler echocardiography. By using multiple Doppler sample volumes, the error can be minimized.

show abstract

Where to place the Doppler sample volume in the human main pulmonary artery: evaluated from magnetic resonance phase velocity maps

Cited by 4 publications

References 30 publications

Transoesophageal echocardiography is unreliable for cardiac output assessment after cardiac surgery compared with thermodilution*

Transoesophageal echocardiography is unreliable for cardiac output assessment after cardiac surgery compared with thermodilution*

Diameter and Cross-sectional Area Relationship of the Human Main Pulmonary Artery: Evaluated by Epicardial Echocardiography

The impact of ischemic heart disease on main pulmonary artery blood flow patterns: a comparison between magnetic resonance phase velocity mapping and transesophageal color Doppler

Contact Info

Product

Resources

About