Dysrhythmias
Victoria Anthony MSN RN
,Conduction System of the Heart
, Nervous System Control
of Heart
• Autonomic nervous system controls
– Parasympathetic nervous system
• Decreases rate of SA node
• Slows impulse conduction of AV node
– Sympathetic nervous system
• Increases rate of SA node
• Increases impulse conduction of AV node
• Increases cardiac contractility
, Dysrhythmias
• Disorder of impulse formation, conduction
of impulses, or both
• SA node normal pacemaker of heart (60–
100 beats/minute)
• Secondary pacemakers
– AV node (40–60 beats/minute)
– His-Purkinje fibers (20–40 beats/minute)
Victoria Anthony MSN RN
,Conduction System of the Heart
, Nervous System Control
of Heart
• Autonomic nervous system controls
– Parasympathetic nervous system
• Decreases rate of SA node
• Slows impulse conduction of AV node
– Sympathetic nervous system
• Increases rate of SA node
• Increases impulse conduction of AV node
• Increases cardiac contractility
, Dysrhythmias
• Disorder of impulse formation, conduction
of impulses, or both
• SA node normal pacemaker of heart (60–
100 beats/minute)
• Secondary pacemakers
– AV node (40–60 beats/minute)
– His-Purkinje fibers (20–40 beats/minute)
