Brief Answer:
Don't feel a need to repeat MRI....

Detailed Answer:
Hi,

Your post was not very clear. If possible can you rephrase it in the follow up.
From what I understand you had to deal with a very short blackout as you looked out of the window.

Since you have had normal MRI less than year ago, I would look at other factors / investigations before ordering a repeat MRI. The tests that I would want to order under such circumstance are:
1. EKG
2. Echocardiogram
3. Lipid Profile
4. Color doppler / MR angiogram of neck blood vessels

It would be ideal if we can get the tests performed after an initial cardiac examination.

Regards

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Brief Answer:
From the given data, doesn't seem concerning...

Detailed Answer:
Atrial tachycardia that occur occasionally and randomly is also known as paroxysmal supraventricular tachycardia (PSVT).. Most often PSVT episodes are short and don't lead to serious concerns. Your last episodes of blackouts can be explained by PSVT. Before we conclude atrial tachycardia as the cause of those blackout, it would be worthwhile to report back to your doctor; discuss about these episodes and the listed tests. Perhaps your cardiologist may also order for a 24 hour holter monitoring or event monitor based on his/her assessments.

Besides PSVT, your symptoms may also be related to anxiety. I will urge you to stay relaxed.

Underactive thyroid very rarely cause heart rate abnormality. However you may want to check thyroid state and blood hemoglobin level if they were not done in recent past.

In a nutshell, your symptom of blackout was far too short. With your background history of atrial tachycardia which is often benign and not concerning, I wouldn't be easily concerned at this point. Visit your doctor for further evaluation.

Hope this helps. Let me know if you need clarifications.

Regards

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Brief Answer:
Not serious...

Detailed Answer:
As I mentioned in my previous reply your symptoms could be related to heart rate irregularity like PSVT. Other serious heart disease present with other symptoms of chest pain and breathing difficulties which were quite clearly not present in your case. Therefore I will quite positively not include serious heart diseases in my list of possibilities.

I have asked you to discuss with your doctor since evaluation is not complete without check of neck blood vessel.

I hope I am clear now.

Regards

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Brief Answer:
Normal echo is a good sign.

Detailed Answer:
Echocardiogram looks at heart structures. It is one of the important investigation to rule out heart disease. There are other tests such as stress test, EKG, holter monitor which are performed to rule out heart disease.

In your case the tests done yet are good enough to rule out serious heart disease.

I would order the color doppler or the MR angiogram test to make sure we don't miss minor strokes. Your treating doctor will know about it.

Regards

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Brief Answer:
Those tests are not enough to pick strokes...

Detailed Answer:
Those tests - echo, stress and holter are heart screening tests.

MRI brain, color doppler of neck vessel and MR angiogram are ordered following black out spells to rule out minor strokes. Since you have already had MRI brain few months back and your current spell was very short, I did not ask for repeat MRI. However either a color doppler or MR angiogram is entailed.

Hope its clear now.

Regards

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Brief Answer:
Not serious...

Detailed Answer:
I think I had already answered this question. Blackout for split second is hardly significant. I will not be alarmed with such short disturbance. It is even shorter than an individual reporting minor strokes where symptoms last for few minutes to hours.
This again is a reason why I do not want to repeat MRI.

Regards

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