ECG RHYTHMS

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Sinus rhythm Rate

60-100 minute
Sinus rhythm Rhythm

regular
Sinus rhythm P waves

present
Sinus rhythm Pr interval

.12-.20
Sinus rhythm QRS complex

.06-.12 less than .12
Sinus Bradycardia Rate

less than 60 min
Sinus Bradycardia Rhythm

regular
Sinus Bradycardia P waves

present
Sinus Bradycardia Pr interval

.12-.20
Sinus Bradycardia QRS complex

.06-.12 less than .12
Sinus tachycardia Rate

100-160 min
Sinus tachycardia Rhythm

regular
Sinus tachycardia P waves

present
Sinus tachycardia Pr interval

.12-.20
Sinus tachycardia QRS complex

.06-.12
Sinus Arrhythmia Rate

60-100 min
Sinus Arrhythmia Rhythm

variable/ irregular
Sinus Arrhythmia P waves

Present
Sinus Arrhythmia Pr interval

.12-.20
Sinus Arrhythmia QRS complex

.06-.12
Sinus Arrhythmia findings

often related to respiratory cycle and changes intrathoracic pressure. can be caused by enhanced vagal tone
Sinus Arrest Rate

60-100 min
Sinus Arrest Rhythm

Variable/ irregular
Sinus Arrest P waves

Present
Sinus Arrest Pr interval

.12-.20 normal
Sinus Arrest QRS complex

.06-.12
Sinus Arrest findings

frequent or prolonged episodes resulting in syncope. iscemia sa node. delayed sa node.