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  Indian J Med Microbiol
 

Figure 4: (a) Atrial flutter presenting as fast atrial rhythm that is indistinguishable from other narrow QRS complex tachyarrhythmia such as supraventricular tachycardia or junctional tachycardia. The flutter saw-teeth P waves became unmasked and apparent after administration of adenosine. (b) Electrocardiogram tracing for the same patient demonstrating fast flutter rhythm before synchronized cardioversion, then (c) electrocardiogram demonstrates normal sinus rhythm after synchronized cardioversion

Figure 4: (a) Atrial flutter presenting as fast atrial rhythm that is indistinguishable from other narrow QRS complex tachyarrhythmia such as supraventricular tachycardia or junctional tachycardia. The flutter saw-teeth P waves became unmasked and apparent after administration of adenosine. (b) Electrocardiogram tracing for the same patient demonstrating fast flutter rhythm before synchronized cardioversion, then (c) electrocardiogram demonstrates normal sinus rhythm after synchronized cardioversion