Sinus Tachycardia is a Dysrhythmia that is normal, except that the rate exceeds 100 beats per minute.
Etiology:
- The sympathetic fibers are stimulated thereby, speed up excitation of the SA node.
- Digitalis administration
- Treat underlying cause (fever, shock, electrolyte disturbances etc)
Sinus bradycardia is a dysrhythmia that is normal except that the rate falls below 60 beats per minute.
Etiology:
- The parasympathetic fibers (vagal tone) are stimulated and cause the sinus node to slow.
- Atropine 0.5 to 1.0mg/ IV push to block vagal stimulation.
- Isoproterenol 1mg/500ml D5W to stimulate sympathetic response.
- Pacemakers
Sinus Arrhythmia is a regular irregularity in rhythm which is related to respiratory exchange. No treatment.
Sick Sinus Syndrome is a dysrhythmia that is caused by a disease Sinus node The sinus node conducts at a slow rate or may fail to conduct at all, producing sinus block or pauses. There is related tachycardia, thus it is also “brady – tachycardia syndrome.
Treatment:
- Treatment of ischemia due to arteriosclerotic heart disease, Ml
- Pacemaker
