Can someone tell me what these acronyms mean?

[bundleblocker]

Or direct me to a site which explains them?  These are the results of an EKG performed when I was in the ER last Monday after experiencing Atrial Fibrillation and lightheadedness:

PR interval: *ms
QRS duration: 142 ms
QT/QTc: 368/495 ms
P-R-T axes: *-26 100

I want to know what PR, QRS, QT/QTc and P-R-T are

The diagnosis on the top of the EKG says: Atrial fibrillation with rapid ventricular response (is "rapid" a good or bad sign?) Left bundle branch block (I already knew I had this; doctor not concerned)

Thanks for any help with this!

Greta

[Brooke_38]

Hello...

You are very welcome...I'll keep my fingers crossed that the BB doesn't affect your running:)

[bundleblocker]

Thanks so much for your explanation.  I received two IVs: Digoxin and something else ending in syn?  Can't remember the name. It took about 3 to 4 hours to get me back to normal rhythm. Then I was sent home after taking a potassium tab. Potassium was low at 3.1.  

The next day my cardiologist prescribed Metopoprol, 25 mg.  I have not had to take any meds for the Afibs previously so am kind of anxious starting this betablocker. Hoping the side effects won't affect my running long distances.

Greta

[Brooke_38]

P-R interval is the time required for completion of aerial depolarization; conduction through the AV note, bundle of His, and bundle branches; and arrival at the ventricular myocardial cells. The normal P-R interval is 0 12 to 0.20 seconds.
The QRS interval represents the time required for ventricular cells to depolarize. The normal duration is 0.06 to 0.10 seconds.
The Q-T interval is the time required for depolarization and repolarization of the ventricles.
The time required is proportional to the heart rate. The faster the heart rate, the faster the repolarization, and therefore the shorter the Q-T interval. With slow heart rates, the Q-T interval is longer. The Q-T interval represents about 40% of the total time between the QRS complexes (the R-R interval). In most cases, the Q-T interval lasts between 0.34 and 0.42 seconds.

The electrical axis of the heart is a term used to described the mean direction and magnitude of all electrical impulses generated by the heart during the cardiac cycle. Normally, the heart is positioned in the chest so that the majority of the electrical impulse travels downward (interior) and towards the left.

Atrial Fibrillation with “RVR (rapid ventricular response)  this means that the ventricular response rate to the a-fib is so fast that the chambers can’t fill with blood between the beats. No filling, no blood pressure.

How did they end up terminating this? When this happend to me, the ER Dr's tried IV Cardizem, Lopressor and Digoxin. All did nothing but drop my bp to 60 palp. Ultimately had to be cardioverted.