EKG Supraventricular Rhythms
Ectopic Atrial Tachyardia
Rate: 100-180 bpm Regularity:regular P wave:morphology of ectopic focus is different P:QRS ratio:1:1 PR interval:ectopic focus has different interval QRS width:normal, but can be aberrant at times Grouping:none Dropped Beats:none
Junctional Rhythm
Rate: 40-60 bpm Regularity:regular P wave:variable (none, antegrade, retrograde) P:QRS ratio:none or 1:1 if antegrade or retrograde PR interval:none, short, or retrograde; if present does not represent atrial stimulation of the ventricles QRS width:normal Grouping:none Dropped Beats:none
Accelerated Junctional Rhythm
Rate: 60-100 bpm Regularity:regular P wave:variable (none, antegrade, retrograde) P:QRS ratio:none or 1:1 if antegrade or retrograde PR interval:none, short, or retrograde; if present does not represent atrial stimulation of the ventricles QRS width:normal Grouping:none Dropped Beats:none
Normal Sinus Rhythm
Rate: 60-100bpm Regularity: regular P wave:present P:QRS ratio:1:1 PR interval:normal QRS width:normal Grouping:none Dropped Beats:none
Atrial Flutter
Rate: atrial rate: 250-350; ventricular rate: 125-175 Regularity:usually regular, but may be variable P wave:saw-toothed appearance "F waves" P:QRS ratio:variable, but most commonly 2:1 PR interval:variable QRS width:normal Grouping:none Dropped Beats:none
Premature Atrial Contraction (PAC)
Rate: depends on underlying rate Regularity:irregular P wave:present; in the PAC may be different shape P:QRS ratio:1:1 PR interval:varies in the PAC, otherwise normal QRS width:normal Grouping:sometimes Dropped Beats:none
Junctional Escape Beat
Rate: depends on underlying rhythm Regularity:irregular P wave:variable (none, antegrade, retrograde) P:QRS ratio:none or 1:1 if antegrade or retrograde PR interval:none, short, or retrograde; if present does not represent atrial stimulation of the ventricles QRS width:normal Grouping:none Dropped Beats:yes
Premature Junctional Contraction (PJC)
Rate: depends on underlying rhythm Regularity:irregular P wave:variable (none, antegrade, retrograde) P:QRS ratio:none, or 1:1 if antegrade or retrograde PR interval:none, short, or retrograde; if present does not represent atrial stimulation of the ventricles QRS width:normal Grouping:usually none, but can occur Dropped Beats:none
Sinus Tachycardia
Rate: greater than 100 bpm Regularity: regular P wave:present P:QRS ratio:1:1 PR interval:normal to slightly shortened QRS width:normal to slightly shortened Grouping:none Dropped Beats:none
Multifocal Atrial Tachycardia (MAT)
Rate: greater than 100 bpm Regularity:irregularly irregular P wave:at least 3 different morphologies P:QRS ratio:1:1 PR interval:variable QRS width:normal Grouping:none Dropped Beats:none
Wandering Atrial Pacemaker (WAP)
Rate: less than 100 bpm Regularity: irregularly irregular P wave:at least 3 different morphologies P:QRS ratio:1:1 PR interval:variable depending on the focus QRS width:normal Grouping:none Dropped Beats:none
Sinus Bradychardia
Rate: less than 60 bpm Regularity: regular P wave:present P:QRS ratio:1:1 PR interval:normal to slightly prolonged QRS width:normal to slightly prolonged Grouping:none Dropped Beats:none
Atrial Fibrillation
Rate: variable, ventricular response can be fast or slow Regularity:irregularly irregular P wave:none, chaotic atrial activity P:QRS ratio:none PR interval:none QRS width:normal Grouping:none Dropped Beats:none
Sinoatrial Block
Rate: varies Regularity:irregular P wave:present except in areas of dropped beats P:QRS ratio:1:1 PR interval:normal QRS width:normal Grouping:none Dropped Beats:yes
Sinus Pause/Arrest
Rate:varies Regularity:irregular P wave:present except in areas of pause/arrest P:QRS ratio:1:1 PR interval:normal QRS width:normal Grouping:none Dropped Beats:yes
Sinus Arrhythmia
TP intervals vary with respiration Rate: 60-100bpm Regularity:varies with respiration P wave:normal P:QRS ratio:1:1 PR interval:normal QRS width:normal Grouping:none Dropped Beats:none
