Here are some key points from a review:
MAC is a newly emerging entity and is somewhat poorly understood.
It appears to be mainly a dilated cardiomyopathy (systolic dysfunction).
It appears to be reversible upon cessation of the ingestion, acknowledging that there may be a point in time of irreversibility.
It is believed to be catecholamine mediated and as such has features in common with stress cardiomyopathy, including pathologic findings of contraction band necrosis.