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Heart Blocks

Rhythms

TermDefinition
Heart Block occurs when electrical impulses (signals) from the sinoatrial node (SAN) are slowed or blocked.
Heart blocks inherently (naturally) cause the heart rate to slow.
Heart blocks PR intervals > 0.20 of a second and/or P waves without a QRS complex
1st Degree Heart Block regular rhythm, PRI > 0.20 of a second, one P wave for every QRS complex, relationships between all P waves and QRS complexes.
Relationships exist between P waves and QRS complexes when similar PRIs are present.
2nd Degree Heart Block (Wenckebach) Mobitz I; irregular rhythm, P waves without QRS complexes, progressive lengthening of PRI until a QRS complex is lost and repeats, relationships between P waves and QRS complexes.
2nd Degree Heart Block (Classical) Mobitz II; P waves without QRS complexes, No progressive lengthening of the PRIs, relationships between some P waves and QRS complexes.
3rd Degree Heart Block (CHB) Regular rhythm, P waves without QRS complexes, widening QRS complexes, no relationships between P waves and QRS complexes.
1st & 2nd degree heart block Heart rate usually < (less than) 60 beats per minute
3rd degree heart block also known as complete heart block (CHB)
3rd degree heart block (CHB) also called AV dissociation
AV dissociation Atrioventricular disconnection
3rd degree heart block heart rate usually < less than 40 beats per minute
Bundle branch block (BBB) QRS complexes containing "rabbit ears"
Created by: JBP1031