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ACLS Exam

Stable And Unstable Tachycardia

RULES FOR SINUS TACHYCARDIA

Figure 36

REGULARITYR-R intervals are regular, overall rhythm is regular.
RATEThe rate is over 100 bpm but usually less than 150 bpm.
P WAVEThere is one P wave in front of every QRS. The P waves appear uniform.
PR INTERVALMeasures between 0.12 and 0.20 seconds in duration. PR interval is consistent.
QRS COMPLEXMeasures less than 0.12 seconds.
Table 16

RULES FOR ATRIAL FLUTTER
Figure 37


REGULARITYThe atrial rate is regular. The ventricular rate will usually be regular, but only if the AV node conducts the impulses in a consistent manner. Otherwise, the ventricular rate will be irregular.
RATEThe atrial rate is normally between 250 to 350. Ventricular rate depends on conduction through the AV node to the ventricles.
P WAVEThe P waves will be well defined and have a “sawtooth” pattern to them.
PR INTERVALDue to the unusual configuration of P waves, the interval is not measured with atrial flutter.
QRS COMPLEXQRS measures less than 0.12 seconds.
Table 17

RULES FOR ATRIAL FIBRILLATION (A-FIB) IRREGULAR NARROW COMPLEX TACHYCARDIA

Figure 38


REGULARITYThe atrial rate is regular. The ventricular rate will usually be regular, but only if the AV node conducts the impulses in a consistent manner. Otherwise, the ventricular rate will be irregular.
RATEThe atrial rate is normally between 250 to 350. Ventricular rate depends on conduction through the AV node to the ventricles.
P WAVEThe P waves will be well defined and have a “sawtooth” pattern to them.
PR INTERVALDue to the unusual configuration of P waves, the interval is not measured with atrial flutter.
QRS COMPLEXQRS measures less than 0.12 seconds.
Table 17