ED staff saw 161 people through the service in a 24-hour period on Tuesday.
It was close to the all-time record of 169 set in July.
Only 53 out of the 161 people presenting on Tuesday needed to be admitted.
ED staff had also seen 150 people the previous day and about 140 a day over the weekend.
Doctor Isobel Bradbury said of Tuesday that there were "large volumes of people that potentially might be able to be seen somewhere else".
With New Year's Eve - traditionally one of the busiest nights of the year for hospitals - just around the corner, one fears that unwanted record of 169 will be broken.
While alcohol-related injuries and illness had not been a big issue over Christmas, it is expected to be more of an challenge over the New Year period.
Or course we all deserve a good time and to let our hair down, but looking after ourselves could potentially save the time needed to save the life of another.