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Eisenmenger Syndrome

Clinical Subject Page

Eisenmenger Syndrome

ICD-10

I27.83

Specialty

Cardiology

Onset

Chronic

Reviewed

July 2026

On This Page

Overview

Eisenmenger Syndrome is A severe complication of acyanotic congenital heart disease (ACHD) in which a long-standing lef t-to-right shunt reverses because of pulmonary hypertension, resulting in cyanotic heart disease.
Usually develops during the late stages of congenital heart disease but may occur at any age.

Etiology & Risk Factors

  • -Complete atrioventricular septal defect (AVSD)
    – Persistent truncus arteriosus
    – Atrial septal defect (ASD)
    – Ventricular septal defect (VSD)
    – Patent ductus arteriosus (PDA)

Pathophysiology

  • Long-standing left-to-right shunt in Eisenmenger Syndrome causes prolonged pulmonary hypertension. Pulmonary hypertension results in:
    – Reactive pulmonary vasoconstriction.
    – Permanent remodeling of pulmonary vessels.
    – Irreversible pulmonary hypertension.
    Progressive pulmonary hypertension causes:
    – Right ventricular hypertrophy.
    – Increased right ventricular pressure.
    Right ventricular pressure eventually exceeds left ventricular pressure. Shunt reverses to right-to-left.
    Deoxygenated blood enters the systemic circulation causing:
    – Cyanosis.
    – Digital clubbing.
    – Polycythemia.

Clinical Presentation

  • – Central cyanosis.
    – Differential cyanosis involving the lower extremities (especially in PDA).
    – Digital clubbing.
    – Dyspnea.
    – Chest pain.
    – Clinical features of heart failure. Hematologic Features- Bleeding tendency:
    – Epistaxis.
    – Easy bruising.
    – Hemoptysis.
    – Due to thrombocytopenia.
    – Increased risk of thrombotic events due to hyperviscosity.

History Taking

Assess for:
– Previous congenital heart disease.
– Progressive cyanosis.
– Dyspnea.
– Exercise intolerance.
– Chest pain.
– Symptoms of heart failure.
– Bleeding episodes.
– Symptoms suggestive of thrombosis.
– Pregnancy status and counseling needs in women of childbearing age.

Investigations

  • Echocardiography
    Used to assess:
    – Underlying congenital heart defect.
    – Direction of the shunt.
    – Right ventricular pressure.
    – Pulmonary artery pressure.
    Cardiac Catheterization
    Used for:
    – Measuring pulmonary and intracardiac pressures.
    – Assessing shunt severity.
    – Evaluating other causes contributing to right-to-left shunting. ECG
    – Detects arrhythmias such as atrial fibrillation. Laboratory Studies
    Complete blood count (CBC):
    – Elevated hemoglobin.
    – Elevated hematocrit.
    – Thrombocytopenia. Basic metabolic panel (BMP):
    – Elevated creatinine.- Elevated blood urea nitrogen (BUN).
    Iron studies:
    – Evaluate for iron deficiency secondary to erythrocytosis.

Diagnosis

  • Diagnosis is based on:
    – Clinical evidence of cyanosis in a patient with congenital heart disease.
    – Echocardiography demonstrating shunt reversal and pulmonary hypertension.
    Supportive investigations:
    – Cardiac catheterization.
    – ECG.
    – CBC.
    – BMP.
    – Iron studies.

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Management

  • Management should be directed by:
    – A pulmonary hypertension specialist.
    – A pediatric cardiologist or adult congenital heart disease specialist.
    Medical Management:
    – Counsel patients to exercise cautiously.
    – Cardiopulmonary exercise testing when appropriate.
    – Assess and treat complications:
    – Arrhythmias.
    – Kidney disease.
    – Iron deficiency.
    – Pulmonary hypertension therapy:
    – Bosentan.
    – Consider phosphodiesterase-5 inhibitors:
    – Sildenafil.
    – Tadalafil.
    Pregnancy Counseling:
    – Maternal mortality is approximately 30–50%.
    – Fetal loss or morbidity is approximately 30%.
    – Offer:
    – Contraception counseling.
    – Elective termination of pregnancy when appropriate.
    Advanced Therapy:
    – Heart transplantation and/or lung transplantation with correction of the underlying congenital heart disease (rare).

Complications

  • Cyanotic heart disease.
    Right ventricular hypertrophy.
    Heart failure.
    Arrhythmias.
    Kidney disease.
    Secondary erythrocytosis.
    Iron deficiency.
    Hyperviscosity.
    Thrombotic events.
    Bleeding tendency.
    Differential cyanosis.

Prognosis

  • – Eisenmenger syndrome represents irreversible pulmonary vascular disease.
    – Prognosis depends on:
    – Severity of pulmonary hypertension.
    – Underlying congenital heart disease.
    – Development of complications.
    – Heart and/or lung transplantation may be considered in selected patients but is limited by donor a vailability and poor overall prognosis.

Key Points / Clinical Pearls

  • – Eisenmenger syndrome develops from a long-standing left-to-right shunt that reverses to a right-t o-left shunt.
    – Common underlying defects:
    – ASD.
    – VSD.
    – PDA.
    – AVSD.
    – Persistent truncus arteriosus.
    – Hallmark features:
    – Cyanosis.
    – Digital clubbing.
    – Secondary erythrocytosis.
    – Differential cyanosis is classically associated with PDA.
    – Echocardiography is the primary imaging modality.
    – Cardiac catheterization is important for hemodynamic assessment.
    – Pulmonary hypertension is treated with bosentan, with possible addition of sildenafil or tadalafil.
    – Pregnancy carries a very high maternal mortality risk and requires specialized counseling.