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Chapter: Medicine Study Notes : Cardiovascular

Other Abnormal Rhythms - Arrhythmias

Atrial tachycardia (paroxysmal atrial tachycardia) – SVT (Supraventricular Tachycardia):

Other Abnormal Rhythms

 

·        Atrial tachycardia (paroxysmal atrial tachycardia) – SVT (Supraventricular Tachycardia):

o  Narrow QRS complex (always exclude atrial flutter with 2:1 block)

o  Often abrupt onset, last for seconds to many hours, then abrupt offset

o  Rate is usually 160 – 200/min

 

o  Therapy: vagal stimulation (carotid massage, one side at a time), adenosine, amiodarone, beta-blockers or digoxin. If LV failure, chest pain or HR > 220 bpm then synchronised counter-shock

 

·        Premature Atrial Complexes (PAC): atrial ectopic beats. Small spike before premature but normal width QRS

 

·        Junctional or Nodal rhythm: regular rhythm. May be no detectable P wave (due to retrograde firing into atrium) or inverted P-wave with short PR interval. P wave may be buried in QRS complex. Rate of 40 – 60 bpm. Reduction in atrial filing. Treatment often not indicated

 

·        Premature Ventricular Complexes (PVC‟s): bizarre, wide QRS complexes triggered by an ectopic ventricular focus. Most common post-MI rhythm. Unifocal PVC‟s (each complex looks the same) or multifocal (each complex looks different from others)

 

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Medicine Study Notes : Cardiovascular : Other Abnormal Rhythms - Arrhythmias |


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