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Sinus arrhythmia often accompanies sinus bradycardia, but the P waves have a normal morphology unless atrial disease is present A PR interval of up to 021 is normal in sinus bradycardia When the sinus rate is less tha~60 beats per minute it is called sinus bradycardiaJan 31, 10 · Sinus bradycardia is evident from the long RR interval of 1280 ms, corresponding to a heart rate of 47 per minute PR interval is also prolonged at about 3 msec The combination can occur in vagotonic states or in those on beta blockers or other drugs which suppress both the sinus node and the AV nodeNov 21,  ·  Sinus bradycardia is a cardiac rhythm with appropriate cardiac muscular depolarization initiating from the sinus node generating less than 60 beats per minute (bpm) The diagnosis of sinus bradycardia requires visualization of an electrocardiogram showing a normal sinus rhythm at a rate lower than 60 bpm 3 Determine Which Traces Is Sinus Rhythm Sinus Chegg Com Sinus bradycardia with sinus arrhythmia