echocardiogram results+ "slight prolapse"

Hello, I'm a 29 year old female. I have been having Sinus Tachycardia for over a year with heart rate of up to 170 bpm. Recently, I had my second echocardiogram with a new cardiologist. Apparently everything seems completely normal aside from the following, which the cardiologist told me is not a big deal at all.

Mitral Valve: Slight prolapse of the posterior leaflet. Trace regurgitation visualized.
Aortic Valve: Slight Calcification, No evidence of stenosis. No regurgitation visualized.
Tricuspid Vavlve: Leaflets are morphologically normal. Trace tricuspid regurgitation.

Has anyone ever heard of "slight mitral valve prolapse"?  

My echocardiogram from last year at the same time says the following, so I'm a bit confused as to how I now have MVP, etc. Is that something that just shows up in a year's time?

The mitral valve was morphologically normal with mild mitral regurgitation. There was no mitral valve prolapse.
The aortic valve appeared trileaflet and morphologically normal with no aortic insufficiency noted,
The tricuspid valve was morphologically normal with mild tricuspid regurgitation with an estimated RSVP of 26 mmHg.

Is it possible for one of these readings to be wrong, perhaps? Do I have mitral valve prolapse or not? Should I be concerned with any of these results or are they anywhere close to normal?

Thanks for your help.

[is_something_wrong]

I can't say for sure, but the words "slight", "trace" and "mild" often imply that something can be measured, but it has no consequence what so ever. Please be aware that the valves in the heart are passive; in order for them to close, some blood must necessarily run back (if not, they wouldn't close).

If the cardiologist told you it's not a big deal, you shouldn't worry at all. The heart is never mathematically perfect, and there are some small errors in every heart. Like a PAC or a PVC, they are not "normal" but everyone have them. The cardiologist must decide what's within normal limits and what need treatment.

The sinus tachycardia up to 170 BPM, what is the cause? I hope you don't have a constant heart rate of 170, that would be serious. If it happens during anxiety attacks or similar conditions, it's normal.

[bbxx]

I have mild mitral valve prolapse as well as mild thickening of the leaflets and mild regurgitation of the mitral and tricuspid valves. They say its nothing-- From what I understand mvp shows up some times and at other times it doesnt when its a mild case.