Non-invasive automated assessment of the ratio of pulmonary to systemic flow in patients with atrial septal defects by the colour Doppler velocity profile integration method

• Published in: Heart (British Cardiac Society) Vol. 88; no. 3; pp. 278 - 282
• Main Authors: Ueda, Y, Hozumi, T, Yoshida, K, Watanabe, H, Akasaka, T, Takagi, T, Yamamuro, A, Homma, S, Yoshikawa, J
• Format: Journal Article
• Language: English
• Published: London BMJ Publishing Group Ltd and British Cardiovascular Society 01.09.2002; BMJ; BMJ Publishing Group LTD; Copyright 2002 by Heart
• Subjects: ACM; Adult; Aged; atrial septal defect; automated cardiac flow measurement; Biological and medical sciences; Cardiac Catheterization - methods; Cardiovascular system; colour Doppler; Congenital Heart Disease; echocardiography; Echocardiography - methods; Echocardiography, Doppler - methods; Echocardiography, Transesophageal - methods; Female; Heart Septal Defects, Atrial - diagnostic imaging; Heart Septal Defects, Atrial - physiopathology; Humans; Investigative techniques of hemodynamics; Investigative techniques, diagnostic techniques (general aspects); left ventricular stroke volume; LVSV; Male; Medical sciences; Middle Aged; Oximetry - methods; Prospective Studies; Pulmonary Circulation - physiology; pulmonary to systemic flow; Qp/Qs; right ventricular stroke volume; RVSV; Stroke Volume; Ventricular Dysfunction, Left - diagnostic imaging; Ventricular Dysfunction, Left - physiopathology; Ventricular Dysfunction, Right - diagnostic imaging; Ventricular Dysfunction, Right - physiopathology; Sonography; Doppler ultrasound study; Human; Blood gas; Regional blood flow; Oxymetry; Cardiovascular disease; Exploration; Intracardiac defect; Congenital disease; Automatic processing; Malformation; Heart disease; Non invasive method; Atrial septal defect; Hemodynamics; Technique
• ISSN: 1355-6037; 1468-201X
• DOI: 10.1136/heart.88.3.278

Background: The recent introduction of the automated cardiac flow measurement (ACM) method, using spatiotemporal integration of the Doppler velocity profile, provides a quick and accurate automated calculation of cardiac output. Objective: To evaluate the ACM method against oximetry during cardiac catheterisation for estimating the Qp/Qs (pulmonary to systemic flow) ratio in patients with an atrial septal defect. Methods: Left and right ventricular stroke volume (LVSV, RVSV) were calculated by ACM in 22 patients with an atrial septal defect who underwent cardiac catheterisation and in 11 patients without heart disease (control group). With ACM, the Qp/Qs ratio was estimated from RVSV divided by LVSV. In the patients with an atrial septal defect, the Qp/Qs ratio was assessed by oximetry at the time of cardiac catheterisation. Results: There was a good correlation between LVSV and RVSV obtained by ACM in the control group (r = 0.98, y = 0.97x + 0.25, SEE = 2.9 ml). The mean difference between LVSV and RVSV by ACM was −1.25 (2.76) ml. The Qp/Qs ratio obtained by ACM in the control group was 0.98 (0.06). The Qp/Qs ratio in patients with an atrial septal defect was significantly higher than in the control group (3.11 (1.20), p < 0.001). ACM determination of the Qp/Qs ratio correlated well with oximetry determination (r = 0.86, y = 0.75x + 0.55, SEE = 0.64). The mean difference between ACM and oximetry for the measurement of the Qp/Qs ratio was −0.28 (0.69). Conclusions: The newly developed ACM method is clinically useful for non-invasive automated estimations of the Qp/Qs ratio in patients with an atrial septal defect.