Medical Lecture Notes Online: ecg

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ECG 3-Normal Sinus Rhythm (NSR)

• Etiology: the electrical impulse is formed in the SA node and conducted normally.

• This is the normal rhythm of the heart; other rhythms that do not conduct via the typical pathway are called arrhythmias.

• Step 1: Calculate rate.
• Step 2: Determine regularity.
• Step 3: Assess the P waves.
• Step 4: Determine PR interval.
• Step 5: Determine QRS duration.