The purpose of the research is to characterize the effect of labetalol, atenolol, and nifedipine on maternal hemodynamics early in pregnancy. Patients will be given medication based on their hemodynamics and asked to return for a repeat measurement.
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Systolic blood pressure
Timeframe: Initial assessment of hemodynamic parameters will be measured. A change from baseline will be assessed one week later.
Diastolic blood pressure
Timeframe: Initial assessment of hemodynamic parameters will be measured. A change from baseline will be assessed one week later.
Mean arterial pressure
Timeframe: Initial assessment of hemodynamic parameters will be measured. A change from baseline will be assessed one week later.
Heart rate
Timeframe: Initial assessment of hemodynamic parameters will be measured. A change from baseline will be assessed one week later.
Cardiac output
Timeframe: Initial assessment of hemodynamic parameters will be measured. A change from baseline will be assessed one week later.
Systemic vascular resistance
Timeframe: Initial assessment of hemodynamic parameters will be measured. A change from baseline will be assessed one week later.