If tachycardias can be induced during the EP study, then by studying the electrical signals recorded from the electrode catheters, the precise cause of the tachycardia can usually be identified. Once this is accomplished, the appropriate therapy for the tachycardia usually becomes clear.
A dilute acid is one that is not very concentrated. You can make an acid solution more dilute by adding water. Note that you have to be careful with the terms strong and weak; very strong acids can also be very dilute.
Sulfuric acid in its pure form is a colorless viscous liquid commonly called oil of vitriol. The chemical formula for sulfuric acid is H 2 SO 4 and it is commercially available as a 96-98% solution or 18M H 2 SO 4. Concentrated sulfuric acid is covalent in nature as the acid is unionized. The atoms in the molecule are covalently bonded to one another. In this form sulfuric acid can be transported in stainless steel tankers. If concentrated sulfuric acid is added to water the reaction is extremely exothermic due to formation of hydrogen ions.