Lev’s Syndrome - Symptoms, Diagnosis, and Treatment

Introduction

Lev's syndrome is a rare and progressive cardiac disease. It is caused by the thickening of the cardiac muscles' fibrous tissue (fibrosis). It was initially identified in 1964 by Maurice Lev. This disorder begins in the fourth decade of life. However, the age at which the sickness manifests itself varies. It involves degeneration of the multiple cardiac structures such as the aortic sinuses, central fibrous body, ventricular septum, and mitral annulus, bundle of His and Purkinje fibers of the heart. When total heart block occurs, familial Lev’s syndrome can cause syncopal episodes, dyspnea (shortness of breath), abdominal discomfort, disorientation, heart failure, or sudden death. Syncope has been described after exertion, and the condition can develop from normal electrocardiography (ECG) to right or left bundle branch block and then to full heart block. This condition also causes increased chances of a heart block with age.

What Is the Cause of Lev’s Syndrome to Occur?

Lev syndrome may be caused by the natural aging process and, to some extent, due to genetic susceptibility. Although unidentified fibrosis of the conducting system is occasionally discovered, the degenerative changes observed are frequently the result of ischemic (lack of blood supply) heart disease, previous myocardial infarction (heart attack), or long-standing hypertension and left ventricular hypertrophy (abnormal increase in ventricular size).

What Are the Other Names for Lev’s Syndrome?

The other names of Lev’s syndrome are as follows:

1. Lenègre’s disease.

2. Lev’s disease

3. Maladie de Lenègre.

What Are the Symptoms of Lev’s Syndrome?

The symptoms of Lev’s syndrome are as follows:

• Palpitations.

• Syncope (fainting).

• Bradycardia (decreased heart rate).

• Stokes-Adams attacks - This condition can trigger Stokes-Adams attacks which cause a brief loss of consciousness caused by a significant slowing of the heart when the atrial impulse of the heart is no longer carried to the ventricles. This is not to be confused with the potentially fatal cessation of heartbeat caused by ventricular fibrillation (abnormal heartbeat) or asystole (without contraction of the heart). First-degree cardiac blockages never cause symptoms and do not require treatment. Symptoms of second and third-degree heart blockages are as follows:

• Palpitation (awareness of a slow heartbeat).

• Light-headedness.

• Dizziness.

• Sense of falling or being on the verge of falling (presyncope).

• Temporary loss of consciousness and low blood pressure (syncope).

• Weariness.

• Chest pain.

• Shortness of breath.

• Cardiac arrest.

How Is Lev’s Syndrome Diagnosed?

• Electrocardiograms (ECG) - ECG abnormalities may occur by chance during screening or as part of an examination for unexplained palpitations, decreased heartbeat, or sudden fainting. Lev's syndrome is recognized as a potential cause of sudden cardiac death (SCD).ECG patterns illustrate illness development in the conducting system.

• Cardiac Magnetic Resonance Imaging (MRI) - They are used to look for potential congenital heart disease or cardiomyopathy (enlargement of the heart muscles). Even in cases of isolated Lev's syndrome, screening for the genes implicated in familial Lev’s syndrome should be done at a young age.

• Pathological Examination - It reveals significant fibrous degeneration and replacement of the left and right bundle branches.

The first tracing reveals a normal sinus rhythm, then an atrioventricular (AV) block with right ventricular delay, and lastly, severe terminal bradycardia. The SCN5A and TRPM4 gene abnormalities that induce progressive familial heart block disrupt the channels' normal function. Because of these channel changes, cardiac cells have trouble creating and sending the electrical impulses required to coordinate regular heartbeats, resulting in heart block. The death of these damaged cardiac cells over time might result in fibrosis, exacerbating the heart block.

What Is the Treatment for Lev’s Syndrome?

Treatment is determined by the degree of the block and whether or not symptoms exist. If feasible, any underlying cause of the heart block should be addressed.

• Temporary Cardiac Pacing Assistance - For the early stabilization of hemodynamically unstable patients with cardiac conduction abnormalities, temporary cardiac pacing assistance is lifesaving.

• Drugs - The drugs that interfere with conduction, such as beta-blockers, calcium channel blockers, and Digoxin, will be phased out.

• Pacemaker - In individuals with irreversible causes of cardiac conduction abnormalities, pacemaker implantation and measures to reduce high-risk behaviors such as driving should be done.Most instances of second-degree heart block do not require treatment, but it is crucial to consult a professional since some may require a pacemaker insertion if the condition worsens. Third-degree heart block can result in cardiac arrest and should thus always be treated with a pacemaker.

What Precautions Should Be Taken With Lev’s Syndrome?

• Patients with any degree of heart block should be checked every six months, and affected family members with normal ECGs should be checked at least once a year.

• Medication with conduction-slowing properties should be avoided, and fever, an aggravating cause in SCN5A mutation carriers, should be handled ahead of time.

• A clinical assessment of first-degree family members is necessary when a clinical diagnosis of Lev's syndrome is found at a young age, which is found at a young age.

• Transmission is autosomal dominant, with variable expressivity and imperfect penetrance. Individuals with the disease-causing mutation should be offered genetic counseling, alerting them that their kids have a 50 percent chance of inheriting the mutation. It is uncommon to find recessive or sporadic variants.

What Is the Differential Diagnosis for Lev’s Syndrome?

The differential diagnosis for Lev’s syndrome includes:

• Brugada syndrome (inherited heartbeat irregularity condition.

• Long QT syndrome (disorder due to disturbance in the rhythm of the heartbeat).

• Idiopathic ventricular fibrillation (excessive beating of the ventricular chamber of the heart due to unknown reasons).

• Progressive familial heart block type II.

• Lupus neonatal (genetic condition of abnormal heartbeat).

• Sudden infant death syndrome (unexpected death of a healthy baby).

What Is the Prognosis of Lev’s Syndrome?

This is determined by the degree of the malfunction and the kind of arrhythmia (irregular heartbeat). The prognosis for Lev’s syndrome with first-degree heart block is favorable because the majority of cases are asymptomatic and do not require therapy.

Conclusion

Lev's syndrome is a progressive type of disease that causes sudden (idiopathic) fibrosis of the cardiac conduction system, causing a heart block (atrioventricular (AV) block). This is most typically seen in the elderly as a part of the aging process of the heart. The illness might be asymptomatic or cause dyspnea, dizziness, syncope, stomach discomfort, heart failure, or death. Depending on the rhythm that emerges, treatment involves a permanent pacemaker.