Fetal Cardiac CareDr. Mridul Agarwal · Sir Ganga Ram Hospital
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Fetal Cardiac CareDr. Mridul Agarwal · Sir Ganga Ram Hospital
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If you have been diagnosed with Systemic Lupus Erythematosus (SLE) or told you have anti-Ro (SSA) or anti-La (SSB) antibodies, learning that these conditions can affect your baby's heart can be stressful. However, understanding the exact numbers, risks, and proactive monitoring options provides tremendous reassurance.
The most important fact to know first: Over 95% of women with SLE and anti-Ro/La antibodies will give birth to babies with completely normal hearts and normal heart rhythms. With timely fetal monitoring, we can protect that healthy journey.
The heart has an internal electrical wiring system that coordinates beating between the upper chambers (atria) and lower chambers (ventricles). In rare cases, maternal antibodies crossing the placenta between 16 and 28 weeks can cause inflammation in this conduction pathway, slowing the transmission of electrical signals (atrioventricular block).
If you test positive for anti-Ro or anti-La antibodies, the chance of complete heart block in your baby is only about 2% to 5%. This means 95% to 98% of babies are completely unaffected.
If you previously had a child diagnosed with neonatal lupus or congenital heart block, the risk in subsequent pregnancies rises to around 12%–20%, making close surveillance essential.
If you have SLE but your anti-Ro and anti-La tests are negative, your baby does not have an increased risk of antibody-mediated heart block.
Between 16 and 28 weeks of gestation, we perform targeted fetal echocardiography using specialized pulsed-wave Doppler to measure the baby's mechanical PR interval (the electrical conduction time from the atrium to the ventricle).
Why early monitoring matters: If electrical conduction starts to slow (first-degree block), detecting it early gives the medical team a window of opportunity to evaluate medical therapies (such as transplacental corticosteroids) before irreversible third-degree block occurs.
In addition to electrical rhythm checks, a complete structural fetal echocardiogram is performed around 18–22 weeks to ensure that all 4 chambers, valves, ventricular septum, and aortic and pulmonary blood vessels are anatomically healthy.
If you have SLE, Sjögren's syndrome, or positive anti-Ro/anti-La antibodies, schedule your serial PR interval monitoring and structural scan with Dr. Mridul Agarwal at Sir Ganga Ram Hospital or Bedi Ultrasound, Delhi.
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