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This may mean Cerebro-Vascular Insufficiency.
The same process that had affected the heart before could also be affecting blood vessels elsewhere.
It is advisable to see a neurologist
of brain as also MRA may well be necessary for further assessment and assistance.
You should re-assess your cardiovascular and coronary artery
Abnormal rhythm, change in coronary status and ventricular function have to be evaluated.
You were lucky / you will be lucky - your concern like this, will get you investigated and treated.
Wishing speedy recovery