If I remember my crim psych reading correctly, sudden and fleeting bursts of anger are a hallmark of psychopathy. I won’t say outright that that’s Christian’s particular psychopathology, but I will say it’s a good possibility.
I'm studying psychology. And as much as i want to agree, Christian is not a psychopath. He lacks another characteristic traits that can identify him as one. For example: "Failure to follow any life plan"; "Lack of empathy"; "Parasitic lifestyle"; "Pathological egocentricity and incapacity to love." The way E. L. James portrays him surely is not helpful but psychopaths cannot love and Christian "loves" Ana, or so he says. He's not a psychopath. He's just a jerk.