Heart rate variability (HRV) provides a non-invasive assessment of autonomic control of the nervous system over the heart. During pregnancy, the cardiovascular system adapts significantly, affecting HRV and hemodynamics. Studying the relationship between HRV and hemodynamic changes is critical to understanding and monitoring cardiovascular health during pregnancy and postpartum, and predicting potential complications.
Age range
18 Years
Sex
FEMALE
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AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.
Bring these to your next appointment. They're a starting point for a shared conversation — not a sign you qualify or a recommendation to enrol.
Generated to help you prepare — always confirm anything about your own eligibility and care with the study team and your doctor.
The trial coordinator is the person who runs the study day to day. These cover the practical side — logistics, costs, and what taking part would actually mean for your life. The study team confirms whether you meet the criteria; these are questions to ask, not a sign you qualify.
A starting point for the conversation — always confirm anything about your own eligibility, costs, and care with the study team and your doctor.
RR (R-R range)
Timeframe: Pregnancy weeks 13, 27 and 41. Postpartum month, 3, 6 and 12 months.
RMSSD (Root Mean Square of Successive Differences)
Timeframe: Pregnancy weeks 13, 27 and 41. Postpartum month, 3, 6 and 12 months.
pNN50 (Percentage of successive RR intervals differing by more than 50 ms)
Timeframe: Pregnancy weeks 13, 27 and 41. Postpartum month, 3, 6 and 12 months.
HF (High Frecuency)
Timeframe: Pregnancy weeks 13, 27 and 41. Postpartum month, 3, 6 and 12 months.
LF (low frequency)
Timeframe: Pregnancy weeks 13, 27 and 41. Postpartum month, 3, 6 and 12 months.
SD1 (standard deviation 1)
Timeframe: Pregnancy weeks 13, 27 and 41. Postpartum month, 3, 6 and 12 months.
SD2 (standard deviation 2)
Timeframe: Pregnancy weeks 13, 27 and 41. Postpartum month, 3, 6 and 12 months.
DFAa1 (Trend Flotation Analysis, alpha-1)
Timeframe: Pregnancy weeks 13, 27 and 41. Postpartum month, 3, 6 and 12 months.
DFAa2 (Trend Flotation Analysis, alpha-2)
Timeframe: Pregnancy weeks 13, 27 and 41. Postpartum month, 3, 6 and 12 months.
SampEn (Sample Entropy)
Timeframe: Pregnancy weeks 13, 27 and 41. Postpartum month, 3, 6 and 12 months.
ApEn (approximate entropy)
Timeframe: Pregnancy weeks 13, 27 and 41. Postpartum month, 3, 6 and 12 months.
MSE (Multiscale entropy)
Timeframe: Pregnancy weeks 13, 27 and 41. Postpartum month, 3, 6 and 12 months.
D2 (Correlation dimension)
Timeframe: Pregnancy weeks 13, 27 and 41. Postpartum month, 3, 6 and 12 months.
Heart rate turbulence (HRT)
Timeframe: Pregnancy weeks 13, 27 and 41. Postpartum month, 3, 6 and 12 months.
Heart rate (HR)
Timeframe: Pregnancy weeks 13, 27 and 41. Postpartum month, 3, 6 and 12 months.
Systolic blood pressure (PAS)
Timeframe: Pregnancy weeks 13, 27 and 41. Postpartum month, 3, 6 and 12 months.
Diastolic blood pressure (DBP)
Timeframe: Pregnancy weeks 13, 27 and 41. Postpartum month, 3, 6 and 12 months.
Mean arterial pressure (MAP)
Timeframe: Pregnancy weeks 13, 27 and 41. Postpartum month, 3, 6 and 12 months.
Pulse pressure (BP)
Timeframe: Pregnancy weeks 13, 27 and 41. Postpartum month, 3, 6 and 12 months.
O2 saturation
Timeframe: Pregnancy weeks 13, 27 and 41. Postpartum month, 3, 6 and 12 months.
Cardiac output (CO)
Timeframe: Pregnancy weeks 13, 27 and 41. Postpartum month, 3, 6 and 12 months.
Stroke volume (SV)
Timeframe: Pregnancy weeks 13, 27 and 41. Postpartum month, 3, 6 and 12 months.
Systemic vascular resistance (SRV)
Timeframe: Pregnancy weeks 13, 27 and 41. Postpartum month, 3, 6 and 12 months.
Vasodilation / Constriction (VDCx)
Timeframe: Pregnancy weeks 13, 27 and 41. Postpartum month, 3, 6 and 12 months.
Cerebral vascular flow (CBF)
Timeframe: Pregnancy weeks 13, 27 and 41. Postpartum month, 3, 6 and 12 months.
Cardiac Index (CI)
Timeframe: Pregnancy weeks 13, 27 and 41. Postpartum month, 3, 6 and 12 months.
Central Venous Pressure (CVP)
Timeframe: Pregnancy weeks 13, 27 and 41. Postpartum month, 3, 6 and 12 months.
Jugular venous distensibility (JVDx/JYI-DI)
Timeframe: Pregnancy weeks 13, 27 and 41. Postpartum month, 3, 6 and 12 months.
The Ankle-Brachial Index with Doppler (ABI-D or ITB)
Timeframe: Pregnancy weeks 13, 27 and 41. Postpartum month, 3, 6 and 12 months.
The Cardio-Ankle Vascular Index (CAVI)
Timeframe: Pregnancy weeks 13, 27 and 41. Postpartum month, 3, 6 and 12 months.
The Acoustic Index Derived (AI-D)
Timeframe: Pregnancy weeks 13, 27 and 41. Postpartum month, 3, 6 and 12 months.
PEP (Pre-Ejection Period)
Timeframe: Pregnancy weeks 13, 27 and 41. Postpartum month, 3, 6 and 12 months.
Ejection Time (ET)
Timeframe: Pregnancy weeks 13, 27 and 41. Postpartum month, 3, 6 and 12 months.