A selection of resources
The RCEM website has this local guideline from Bart's hospital. Obviously as local guideline it is not to be followed exactly, but good example of a logical evidence based approach. Interestingly, this guideline and ESC suggest HR <110 being the safe cut off for discharge.
Some of the finest free to access resources out there
A place for magnesium? Although not suggested by NICE this paper suggest it is helpful in rate control when used in addition to other agents.
This paper suggested that if looking at medium term outcomes there is no harm in waiting.
This paper found 1.3% of patients had AF on admission who had a diagnosis of ACS (STEMI/NTSEMI). However it was only those who developed AF during inpatient stay who had worse outcomes.