Final answer:
Multifocal atrial tachycardia is characterized by multiple ectopic foci within the atria, resulting in irregular P-wave morphology and irregular ventricular response.
Step-by-step explanation:
False. Multifocal atrial tachycardia (MAT) is indeed an irregular rhythm with a heart rate greater than 100. MAT is characterized by multiple ectopic foci within the atria, resulting in irregular P-wave morphology and irregular ventricular response. It is typically seen in individuals with underlying lung disease or chronic obstructive pulmonary disease (COPD), as well as other conditions such as congestive heart failure and electrolyte imbalances.