BUZZ-Spectral Medical says unaware of reason for Thursday's plunge
** Spectral Medical's shares surge as much as 46.3 pct on Friday, following a near 34 pct slump on Thursday
** Canadian drug developer says Friday it is unaware of "any material, undisclosed corporate developments" that may have resulted in the fall in shares
** Stock's intraday pct gain Friday is its biggest in more than 2 yrs
** Spectral said on Thursday it planned to file in Q4 clinical data on its device to reduce mortality in patients with septic shock
** Up to Wednesday's close, stock had risen about 86 pct in the past 12 months
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