Unusually short VA time during Para-His pacing maneuver: Is it a simultaneous atrial capture?

Although a very VA interval (<60 ms in proximal CS) is suggestive of simultaneous atrial capture, rarely it can have exception. A very short VA shall not be discarded without analysing the electro grams.

Comparison of dexmedetomidine and clonidine (α2 agonist drugs) as an adjuvant to local anaesthesia in supraclavicular brachial plexus block: A randomised double-blind prospective study.

Background And Objectives: Alpha-2 agonists are mixed with local anaesthetic agents to extend the duration of spinal, extradural and peripheral nerve blocks. We compared clonidine and dexmedetomidine as an adjuvant to local anaesthetic agent in supraclavicular brachial plexus block with respect to onset and duration of sensory and motor block and duration of analgesia.

Methods: Sixty ASA I and II patients scheduled for elective upper limb surgeries under supraclavicular brachial plexus block were divided into two equal groups in a randomized, double-blinded fashion.