A macroreentrant circuit is one that involves a small area of heart tissue, usually a few centimeters or less.

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Macroreentry circuits and microreentry circuits are two main types of reentry circuits. If the reentry circuit involves conduction through a large area of the heart, such as the entire right or left atrium, it is called a macroreentry circuit. A reentry circuit involving conduction within a small area is called a microreentry circuit.

A Macroreentrant Circuit Is One That Involves a Small Area