To assess whether the aCQM-Strain ultrasound method allows a good analysis of fetal cardiac function. Establish normality parameters and compare it with fetuses with risk factors of cardiac dysfunction.

National unicentric observational study of follow-up study of a cohort. It has been decided to conduct a study of consecutive cases, including all patients who meet the inclusion criteria during the time of the study.

Until now, there has not been an easy and convenient method to determine fetal cardiac function. Recently a new Software (Automated Cardiac Motion Quantification aCMQ) has been developed, and it seems that allows an easier analysis of this one.

This study aims to analyze fetal heart function with the Strain method in healthy patients and then compare it with fetuses with risk factors for cardiac dysfunction.

Initially, healthy pregnant patients who agree to participate in the study will be cited, after signing the informed consent, in order to evaluate the normal fetal cardiac function and see how it is modified in the different weeks of gestation.

To do this, a fetal echocardiography will be performed by the investigators at week 24, 28, 32 and 36 of pregnancy, using the aCMQ-Strain method.

Once the investigators have established normality curves, fetuses with risk factors for cardiac dysfunction of women who agree to participate in the study will be analyzed. For this purpose, a fetal echocardiography at week 24, 28, 32 and 36 of gestation, using the aCMQ-Strain method will be performed.

All tests will be carried out in the same study center and will be carried out by independent scouts.The data obtained in each test will be collected in an anonymized database for further study.

Inclusion Criteria:

• Patients older than 18 years
• Pregnant women> 20 weeks gestation
• Understand and accept the study procedures and sign an informed consent.

Exclusion Criteria:

• Not being able to understand the nature of the study and / or the procedures to be followed.
• Not signing informed consent
• Under 18 years of age
• Not pregnant

Those healthy pregnant women who come to our hospital to perform the morphological ultrasound of the 2nd trimester, or pregnant women with pregestational diabetes, or with a diagnosis of intrauterine growth restriction and / or preeclampsia will be invited to participate in the study. For this, the Participant Information sheet in the study will be provided and the Informed Consent will be signed.

Those patients who wish to participate in the study will be cited for the performance of an echocardiography using the aCMQ-Strain method at week 24, 28, 32 and 36 of gestation.

All the tests will be carried out in the same study center and will be carried out by independent scouts.