Question on keg conditioning with DME or Priming Sugar

[MJDore]

This will be the first time I've carbed a beer in the keg with priming sugar instead of CO2 since I started kegging. For those of you who do that, do you give the keg a blast of CO2 after filling and release to purge the headspace? Or just fill it with beer and priming sugar and forget about it?

 

[BBL_Brewer]

I always purge with CO2. The yeast shouldn't need anymore O2....IMO.