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Case 3. The panel on the left shows fECG done at 27 weeks' gestation, revealing a normal QT interval (QTc 433 ms). The panel on the right is fMCG at 22 weeks' gestation; also normal with an averaged QTc 451 ms. RR, time between consecutive R waves, representative of the heart rate; PR, interval between the P wave and R wave, reflecting conduction from the atria through the atrioventricular node; P, P wave, representing atrial contraction; QRS, ventricular depolarization.
