Fig 75.

68 year old lady with ischæmic heart disease and impaired LV function (EF 31%). The rhythm shown below was 140/min before the current procainamide infusion. What was the infusion started for?

68 year old lady with ischæmic heart disease and impaired LV function (EF 31%). The rhythm shown below was 140/min before the current procainamide infusion. What was the infusion started for?