ECG and Reading during pregnancy *Treatment In Nashik * ECG changes in normal pregnancy include a reduction in the mean values of PR interval, sinus tachycardia, left axis deviation, inverted or flattened T waves and a Q wave in lead DIII. HR, heart rate. Heart rate (HR) increases progressively throughout the pregnancy, reaching a peak during the third trimester. The clinician is often consulted to examine a pregnant woman for the presence of cardiovascular disease. Delineation of heart disease during pregnancy may be especially difficult, as the considerable hemodynamic changes that occur during normal pregnancy typically produce signs and symptoms that mimic cardiovascular disorders. Dyspnea, fatigue, palpitations, and chest discomfort are commonly described by normal pregnant women but are rarely of a severity to limit usual daily activities; syncope is a less frequent complaint.