I suspect the reason your daughter's cardiologist recommended salt and increased fluid intake is that he thought she has a disorder that causes poor regulation of blood pressure changes with sitting and standing. I wonder if your daughter's current episode was related to the slow heart rhythm you documented. I suggest that you contact her cardiologist to discuss the potential contribution of bradycardia to her symptom complex. In the meantime, the best thing to do is to limit her activity to light - moderate exertion. I hope you find this information useful.
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