By my research, Liprolog is a name of fast-acting insulin in Europe, used as a bolus.
Lantus is perhaps one of the slowest acting insulins, used for basals.
They aren't directly interchangable because of their widely differing speeds. Yeah, they're both insulins, but it's like comparing a scooter with a jet plane, they're both vehicles.
Tachycardia (fast heart beat) is a very well known symptom of diabetic ketoacidosis. What's your ketones and bg's?