Effect of Labetalol, Atenolol, and Nifedipine on Maternal Hemodynamics Measured by ICG in Early Pregnancy

This study compares how three different blood pressure medications — labetalol, atenolol, and nifedipine — affect the heart and circulation in pregnant women with high blood pressure during the first trimester, measured using a non-invasive monitoring technique called impedance cardiography (ICG). **You may be eligible if...** - You are 18 to 45 years old - You are pregnant at less than 15 weeks gestation - You are being seen at a maternal hypertension clinic - You speak English and are willing to give consent **You may NOT be eligible if...** - You are under 18 or over 45 years old - You are more than 15 weeks pregnant - You do not speak English Talk to your doctor to see if this trial is right for you.