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Dec 27, 15 · Figure 11 Sinus bradycardia and mild QRS prolongation in a patient with potassium and a K of 69 mEq/L Figure 12 Sinus bradycardia and subtly peaked Twaves in a patient with mild hyperkalemia and a K of 58 mEq/L Figure 13 Severe sinus bradycardia in a patient with hyperkalemia and a potassium of 65 mEq/LSinus bradycardia ECG, causes & management Definition of sinus bradycardia Sinus bradycardia fulfills the criteria for sinus rhythm but the heart rate is slower than 50 beats per minute ECG criteria follows Regular rhythm with ventricular rate slower than 50 beats per minute Pwaves with constant morphology preceding every QRS complexINTRODUCTION Sinus bradycardia is a rhythm in which the rate of impulses arising from the sinoatrial (SA) node is lower than expected The normal adult heart rate, arising from the SA node, has been considered historically to range from 60 to 100 beats per minute, with sinus bradycardia being defined as a sinus rhythm with a rate below 60 beat