Choice of Electrocardiographic Leads for Recording the Earliest QRS Onset in Noninvasive Measurements KENNETH

dynamic correlates of the third heart sound. Am J Physiol 207: 319, 1964 7. Prewitt T, Gibson D, Brown D, Sutton G: The 'rapid filling wave' of the apexcardiogram: its relation to echocardiographic and cineangiographic measurements of ventricular filling. Br Heart J 37: 1256, 1975 8. Boyer NH, Eckstein RW, Wiggers CJ: The characteristics of normal heart sounds recorded by direct methods. Am Heart J 19: 257, 1940 9. Boyer NH: Studies on the third heart sound. Am Heart J 23: 797, 1942 10. Kuo PT, Hildreth EA, Kay CF: The mechanism of gallop sounds, studied with the aid of the electrokymograph. Ann Intern Med 35: 1306, 1951 11. Kuo PT, Schnabel TG, Blakemore WS, Whereat AF: Diastolic gallop sounds, the mechanism of production. J Clin Invest 36: 1035, 1957 12. Reddy PS, Meno F, O'Toole JD, Curtiss El, Griff FW: The high-fidelity infinite time constant, calibrated pressure apexcardiogram and its correlation with high-fidelity left ventricular pressure. Br Heart J. In press 13. Willems JL: The Normal Apexcardiogram. Arscia Uitgaven N.V., 1973, p 209 14. Rushmer RF: Initial ventricular impulse: a potential key to cardiac evaluation. Circulation 29: 268, 1964 15. Denef B, DeGeest H, Kesteloot H: The clinical value of the calibrated A wave and its relationship to the fourth heart sound. Circulation 60: 1412, 1979 16. Neporent LM: Atrial heart sounds in atrial fibrillation and flutter. Circulation 30: 893, 1964