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a. Sinus Rhythm with Premature Ventricular Contractions (PVCs)
• Description: The baseline rhythm appears relatively regular, but it's interrupted by
wide, bizarre QRS complexes that occur earlier than expected (the PVCs). In this
example, they appear as isolated beats.

b. Atrial Fibrillation (AFib) or A-Fib
• Description: This rhythm is characterized by a completely irregularly irregular
ventricular rhythm (R-R intervals) and the absence of distinct P waves. Instead, the
baseline shows chaotic, fine, undulating activity (fibrillatory waves).

c. Ventricular Tachycardia (VT) or V-Tach
• Description: This is a fast, regular rhythm originating from the ventricles. It's defined
by a sequence of three or more consecutive wide QRS complexes (usually \ge 0.12
seconds) at a rate typically exceeding 100 beats per minute. The QRS complexes are
often uniform in appearance (monomorphic VT).

d. Sinus Rhythm with First-Degree Atrioventricular (AV) Block
• Description: The rhythm is regular with a normal heart rate, and every P wave is
followed by a QRS complex. However, the PR interval (the time from the start of the P
wave to the start of the QRS complex) is prolonged (longer than 0.20 seconds or one
large box), indicating a delay in conduction through the AV node.

e. Asystole
• Description: This is often called "flatline." The tracing shows a nearly straight line,
indicating the absence of electrical activity in the heart.

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