- Effects of cardiac resynchronization therapy on myocardial blood flow measured by oxygen-15 water positron emission tomography in idiopathic-dilated cardiomyopathy and left bundle branch block. Nowak, B., Stellbrink, C., Sinha, A.M., Kaiser, H.J., Reinartz, P., Koos, R., Markus, K., Hanrath, P., Buell, U., Schaefer, W.M. Am. J. Cardiol. (2004)