Comparison of Efficacy, Pattern of Response, Occurrence of Arrhythmias, and the Tolerability of Nitroglycerine and Isoprenaline as Provocative Drugs During Head-Up Tilt Test

Head-up tilt test with NTG provocation has a higher yield of a positive response, lower incidence of unwanted arrhythmias and better tolerability compared to ISO. The occurrence of VASIS type II b and type III response was more with Nitroglycerine than Isoprenaline.