Mechanisms and clinical significance of transient atrioventricular block during dobutamine stress echocardiography
Kuo-Chun Hung, MDa,
Fun-Chung Lin, MDa,
Ming-Shyan Chern, MDa,
Hern-Jia Chang, MDa,
I.-Chang Hsieh, MDa and
Delon Wu, MD, FACCa
a Second Section of Cardiology, Department of Medicine, Chang Gung Memorial Hospital, Chang Gung University College of Medicine, Tao-Yuan, Taiwan

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Figure 1 Electrocardiographic tracings showing Mobitz type I second degree atrioventricular block in case 11 (A) and Mobitz type II block in case 2 (B) during dobutamine stress echocardiography. Arrow indicates p wave.
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