PSVT in mechanically ventilated patient

I had a patient the other day, mechanically ventilated, on weaning protocol who abruptly went into narrow, stable ST for 2 hours plus -- on metoprolol and dig daily, given additional metoprolol with seemingly minimal effect, who abruptly went in to NSR at 65 after a bowel movement. If, after a delivered breath, her ET tube was fully occluded for 20-30 seconds, would increased intrathoracic pressure have possibly been an effective 'vagal maneuver'? (Was on PRVC, and breathing 2-4 breaths... PSVT in mechanically ventilated patient
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