Normal sinus rhythm (NSR) is the characteristic rhythm of the healthy human heart. NSR is considered to be present if the heart rate is in the normal range, the P waves are normal on the ECG, and the rate does not vary significantly. If, however, the R-R interval is variable, the rhythm is called sinus arrhythmia. A sinus rhythm faster than the normal range is called a sinus tachycardia (see “Sinus tachycardia”), while a slower rate is called a sinus bradycardia (see “Sinus bradycardia”). Continue reading →
The greatest change in ACLS is a reduced emphasis on additional modalities, such as medications, rhythm checks, and central line placement, that interrupt compressions for more than 10 seconds and an increased emphasis on searching for and correcting any cause for SCA.