Table 2

 Drug related causes of intraoperative hypertension

Cause of hypertensionNo of incidents
*Associated with epidural injection (n = 3), interscalene blocks (n = 2), cervical plexus block (n = 1).
†All six due to malpositioning of the vaporiser.
‡In three reports drug problems were mentioned but there were insufficient data for analysis.
Vasopressor administration:
    inadvertent, by anaesthetist16
    by a surgeon6
    IV adrenaline with local anaesthetic*6
Anaesthetic failure:
    failure to deliver volatile agent†6
    failure to deliver nitrous oxide4
Unknown‡3
Total41