Congenital Heart Block

What is Congenital Heart Block?

Congenital heart block is a disruption of the heart's electrical conduction system, between the upper chambers (atria) and lower chambers (ventricles), that is diagnosed before birth or within the first 27 days of life. The two most common causes are maternal autoimmune disease and structural heart defects.^{[1, 2]} This is a condition for pediatric and fetal cardiology teams, not for complementary care to treat.

Common symptoms

Symptoms depend on the degree of block. In first-degree block the signal is only delayed and there may be no symptoms. In second-degree block some signals do not get through, which can cause dizziness or fainting. In third-degree (complete) block no signals pass, and the ventricles beat slowly on their own.^{[3, 4]}

Affected people can develop a slow heart rate with symptoms and weakening of the heart muscle (cardiomyopathy).^[1] These may show up as fatigue, fainting, shortness of breath, pallor or a bluish skin color, and heart failure in severe cases.

Causes and risk factors

The most common cause is passage of maternal anti-Ro/SSA and anti-La/SSB antibodies across the placenta. These antibodies cause inflammation and scarring of the heart's atrioventricular (AV) node in the fetus.^{[3, 4]} Many mothers who carry these antibodies do not know they have an autoimmune condition such as lupus or Sjögren's disease until their baby is affected.^{[4, 5]}

Complete block occurs in roughly 2 to 5 percent of pregnancies with these antibodies, and the chance is higher in a later pregnancy after an affected child.^{[5, 6]} Congenital heart defects are the other main cause, and some isolated cases appear to be linked to genetic factors or have no clear cause.^{[1, 5]}

How it is diagnosed and treated conventionally

In pregnancy, congenital heart block is diagnosed by fetal echocardiography, and after birth by electrocardiogram (ECG).^[5] In pregnancies with these antibodies, close monitoring with ultrasound is usually advised from the early second trimester.^{[4, 6]}

Treatment is directed by specialists. Options in pregnancy include corticosteroids, intravenous immunoglobulin and hydroxychloroquine, although their benefit is still debated.^{[2, 7]} Hydroxychloroquine appears promising for preventing the condition in high-risk pregnancies.^{[1, 6]} After birth, a permanent pacemaker is placed when there are symptoms, a weakened heart or other warning findings.^[1] Complete block is irreversible, and lifelong cardiology follow-up is needed, including checks for heart weakness related to long-term pacing.^{[4, 5]}

Why Congenital Heart Block calls for a whole-person approach

Congenital heart block involves the heart, the immune system and often the mother's health, so care usually involves several specialists rather than one. Supportive care can reasonably address the wellbeing of the patient or family, but it cannot change the electrical block.

The sections below describe the factors that matter most. They explain why coordination between doctors matters, not what complementary care can treat.

Autoimmune background

In autoimmune cases the block starts with maternal antibodies and inflammation of the fetal conduction tissue.^[3] Mothers may need rheumatology or maternal-fetal medicine care, and the autoimmune condition itself may need treatment.^[6]

Heart function and the pacemaker

Even with a pacemaker, long-term pacing from one site in the heart can weaken the heart muscle in some people, so the heart needs ongoing monitoring.^[5] This is the main reason for regular cardiology review and device checks.

Future pregnancies

Because the recurrence risk in a later pregnancy is higher, mothers of an affected child generally need specialist planning and surveillance in later pregnancies.^{[5, 6]}

Stress and wellbeing

A serious diagnosis in pregnancy, infancy or adulthood is stressful. Studies of acupuncture and of ashwagandha look at anxiety and stress as symptoms, and none of them involved people with heart block.^{[8, 9]} Any support in this area is aimed at coping and sleep, not at the heart.

Acupuncture as supportive care in Congenital Heart Block

What the research shows

No clinical trials of acupuncture for congenital heart block were found in PubMed. Acupuncture does not treat the conduction block, and it is not a substitute for pacing or any cardiology care.

What exists is research on symptoms. A 2022 meta-analysis of 27 trials (1,782 people) with generalized anxiety disorder found lower anxiety scores with acupuncture than with control treatments, but most trials had an unclear risk of bias and the authors called for larger, higher-quality trials.^[8] A 2018 systematic review of 13 trials reported encouraging outcomes for anxiety disorders but noted that study quality was highly variable and that more research is needed.^[10] These studies do not show an effect in people with heart conditions.

How acupuncture may work

The anxiety reviews above report changes in symptom scores but do not establish how acupuncture might work. Nothing in the research suggests that acupuncture changes the conduction tissue of the heart.

What treatment involves

A session uses fine, sterile, single-use needles, usually left in place for about 20 to 40 minutes, with a short course of visits and a reassessment. In prospective studies, about 9 in 100 patients had a minor reaction such as soreness or bleeding at a needle site, and serious events occurred in about 1 in 10,000 patients.^[11]

Tell the practitioner first if you have a pacemaker, a defibrillator or any implanted device, a bleeding disorder, or take blood thinners, or if you are pregnant. A review of case reports of electroacupuncture lists shock from an implantable defibrillator and cardiac emergencies as possible harms, so electrical stimulation is not suitable for people with implanted cardiac devices unless their cardiologist agrees.^[12] Plain needling without electrical current can be discussed with your cardiology team.

Ayurvedic medicine as supportive care in Congenital Heart Block

The Ayurvedic view

Ayurveda has no classical diagnosis that matches congenital heart block. A practitioner would instead look at the individual's constitution, digestion, sleep, energy and stress, and discuss them in terms of the doshas (Vata, Pitta and Kapha). This is a traditional framework, not a biomedical explanation, and it does not describe the electrical block.

Therapies that may be used

Care is chosen for the individual and, in a supportive role, may include:

• Diet and daily routine, such as regular meals and consistent sleep hours
• Gentle relaxation practices and breathing exercises
• Gentle warm oil massage, if your physician agrees it is suitable
• Herbs, prescribed individually after your medicines have been reviewed

Panchakarma, the Ayurvedic cleansing program, is not appropriate during pregnancy, acute illness or frailty. It is also not suitable for someone with heart failure, symptomatic slow heart rate or an unstable heart condition. It should only be considered if your cardiologist agrees. Transdermal medication therapy, meaning herbal preparations applied to the skin, may be discussed in the same way.

What the research shows

There is no research on Ayurvedic medicine for congenital heart block. A PubMed search found no clinical trials and no case series. Evidence exists only for individual herbs and symptoms: for example, a meta-analysis of 12 trials (1,002 participants) found that ashwagandha reduced anxiety and stress scores compared with placebo, with low-certainty evidence and very inconsistent results.^[9] A second analysis of 9 trials (558 patients) reported lower stress and anxiety scores, with some mild to moderate side effects.^[13] None of these studies included people with heart block.

Herbal medicine as supportive care in Congenital Heart Block

Herbs and formulas that have been studied

No herb or formula has been studied for congenital heart block. Chinese herbal medicine has been studied for systemic lupus erythematosus, which is sometimes the underlying maternal condition, and ashwagandha has been studied for stress and anxiety. These are separate questions from heart block itself.

What the research shows

A meta-analysis of 13 placebo-controlled trials (856 people) of Chinese herbal medicine in systemic lupus erythematosus reported lower disease activity scores and lower glucocorticoid doses than with placebo. The authors called for better-designed, longer trials.^[14] A separate meta-analysis of 7 trials of acupuncture added to standard drugs in lupus reported better response rates, with the authors noting few studies of uneven quality.^[15] These findings concern lupus, not heart block, and say nothing about the heart or about pregnancy.

Safety and herb-drug interactions

Herbs can affect the heart. Aconite roots, used in traditional Chinese medicine only after processing, contain toxins that can cause a slow heart rate and dangerous rhythm disturbances, especially when poorly processed or taken in excess.^[16] For someone with a conduction disorder, any herb with possible effects on heart rate or rhythm needs review by the cardiologist first.

Herbs can also interact with prescribed medicines, including anticoagulants, immunosuppressants and others, sometimes with serious results.^[17] In one study, about one fifth of Ayurvedic medicines bought online contained detectable lead, mercury or arsenic.^[18] Herbs should come from tested sources and be prescribed individually. Tell us if you are pregnant or breastfeeding, or have liver or kidney disease.

Translating traditional medicine into modern biological language

This is interpretation, not equivalence. Chinese medicine may describe palpitations, fatigue or a slow pulse as a deficiency of heart qi or yang, or as blood stasis. Ayurveda may describe irregular rhythm and anxiety as aggravated Vata. These are frameworks for choosing supportive care, and no study has shown that they correspond to the autoimmune injury or the scarring of the AV node that causes this condition.^[3]

Where the language overlaps with biology is in the symptoms around the condition: stress, sleep and the nervous system's response to a serious illness. That is the only area where research on acupuncture or herbs, such as the anxiety studies above, might apply.^{[8, 9]}

How this care fits with your medical care

Complementary care for congenital heart block is supportive only. For a condition like this, we ask that you are under a physician's care for it and that your treating team knows you are receiving complementary care. Keep all cardiology, device and obstetric appointments, and do not stop or change prescribed medicines or any pacemaker follow-up.

We do not diagnose or manage heart block. Please bring your diagnosis, recent ECG or echocardiogram reports, device details if you have a pacemaker, and a full list of medicines and supplements.

When to seek urgent medical care

Congenital heart block can cause sudden, serious problems, and these symptoms need immediate medical assessment.^[1]

• Fainting or near-fainting
• A very slow or irregular heartbeat with dizziness
• Shortness of breath, chest pain or swelling
• Bluish or very pale skin, or unusual sleepiness or poor feeding in an infant
• Any shock, lightheadedness or pain from a pacemaker or defibrillator
• In pregnancy, a fetal heart rate concern raised by your doctor

If any of these occur, call 911 or go to the nearest emergency department.