Out-of-the-blue panic attacks aren't without warning: Body sends signals for hour before

Panic attacks that seem to strike out-of-the-blue are not without warning after all, says psychologists. A new study found significant physiological instability one hour before patients reported feeling a panic attack. The patients wore portable recorders around-the-clock that monitored bodily functions like respiration and heart rate. The findings suggest potentially new treatments for panic, and re-examination of other "unexpected" medical problems, including seizures, strokes and manic episodes.

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