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Figure 2 Efficacy of ATP, nicorandil and verapamil on nonsustained VTs in a representative case. The VT revealed an LBBB pattern and an inferior axis. (A) Nonsustained VTs that were observed 45 times in a 3-min period (150 per 10 min) in the control state. An ATP bolus injection was performed between calibrations in line 8. Nicorandil injection started at calibration in line 11. The nonsustained VT was suppressed from six times in 30 s before ATP administration to once in 30 s after ATP administration. Couplets and nonsustained VTs were suppressed from 13 times in 30 s before ATP administration to five times in 30 s after ATP administration (reduction rate 83% and 62%, respectively, C). The nonsustained VTs were suppressed after nicorandil administration, from 45 times in 3 min before administration to 17 times in the same period after administration (before administration 150 times in 10 min; after administration 60 times in 10 min; reduction rate 60%; C). (B) Forty minutes later nonsustained VT returned to the control level, and the VTs were suppressed from 83 times to 6 times in a 5-min period after verapamil administration (before administration 166 in 10 min; after administration 12 times in 10 min; reduction rate 93%; C).
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