The heart rate of an individual with sinus bradycardia is less than 60 bpm.
The SA node is the pacemaker in individuals with sinus bradycardia and fires at a regular rhythm.
Like normal sinus rhythm, there is one upright P wave before every QRS in the individual with sinus bradycardia.
Like normal sinus rhythm, the PR interval of individuals with sinus bradycardia is between 0.12 to 0.20 seconds, or for simplicity less than 0.20 seconds.
Like normal sinus rhythm, the QRS interval of individuals with sinus bradycardia is less than 0.12 seconds.
If the patient with symptomatic sinus bradycardia experiences symptoms, such as hypotension, weakness, shortness of breath, or confusion, atropine may be administered to increase heart rate. The anticholinergic drug increases the firing of the SA node. Serious cases may require transcutaneous pacing or a permanent pacemaker.
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