Understanding and Assessing Heart Risks

Because Carvajal syndrome can lead to serious heart rhythm issues and heart failure, doctors use a process called risk stratification. This means they look at several different pieces of information to determine the likelihood of a major event and decide if treatments like an ICD (implantable cardioverter-defibrillator) are considered ^[1][2].

Why Standard Risk Models May Not Fit

For many years, doctors used risk models designed for a similar condition called ARVC (Arrhythmogenic Right Ventricular Cardiomyopathy). However, those models were built around the right side of the heart. Since Carvajal syndrome primarily affects the left ventricle (the heart’s main pumping chamber), standard ARVC calculators often may misestimate the risk for these children ^[3][4]. In one study, nearly 1 in 4 patients who experienced a dangerous heart rhythm did not meet the traditional criteria used for ARVC ^[4][5].

Key Variables in Risk Assessment

To get a more accurate picture, your child’s team will track several specific “prognostic variables”:

1. Ejection Fraction (LVEF)

The Left Ventricular Ejection Fraction (LVEF) is a measurement of how much blood the left ventricle pumps out with each contraction. A normal LVEF is usually above 50–55%. While a lower LVEF (below 50%) is a known risk factor for both heart failure and dangerous rhythms, it is important to know that serious arrhythmias can sometimes happen even when the pumping function still looks normal ^[6][3].

2. PVC Burden and Heart Rhythms

A Holter monitor (a 24-hour heart recorder) measures PVCs (premature ventricular contractions), which are “extra” heartbeats. Doctors look at the total number of these beats in a day, as well as episodes of NSVT (non-sustained ventricular tachycardia), which are short bursts of rapid heartbeats ^[1][6]. A higher burden of these irregular beats is a key indicator that the heart’s electrical system is under stress ^[7].

3. Late Gadolinium Enhancement (LGE)

During a Cardiac MRI, a contrast agent is used to look for LGE, which indicates imaging patterns consistent with tissue injury, inflammation, or scarring (fibrosis) ^[3].

• The Hidden Risk: LGE is a critical marker because it can identify damage to the heart muscle that an ultrasound (echocardiogram) cannot see. In some children, LGE is visible even when the heart’s pumping function is completely normal ^[3][8].
• The Pattern: In Carvajal syndrome, scarring often forms a “ring-like” pattern around the heart muscle. This tissue can act like an electrical “short circuit,” potentially triggering dangerous heart rhythms, though it is not an obligatory finding ^[9][10].

The Importance of ‘Hot Phases’

If your child has ever had an episode of chest pain or a rise in heart enzymes (troponin) that looked like a heart infection (myocarditis), this is often called a “hot phase” ^[11]. Any chest pain requires urgent evaluation to rule out infectious myocarditis or other causes. In Carvajal syndrome, these are not just one-time infections; they are myocarditis-like episodes associated with active heart muscle injury related to the genetic mutation. Research shows that experiencing these episodes is associated with a future risk of both heart failure and serious heart rhythm issues ^[6][4].

Specialized DSP Risk Models

Recently, researchers have developed risk models specifically for patients with DSP mutations (like those with Carvajal syndrome). These models combine several factors—including your child’s sex, their history of rapid heartbeats, their 24-hour PVC count, and their LVEF—to provide a more personalized risk estimate ^[1]. These tools help your electrophysiologist assess the risk for your child’s specific situation, but they are research-derived tools and decisions must be highly individualized ^[1][7].

Because risk can change over time, these variables are re-evaluated regularly. This ongoing assessment allows your medical team to stay one step ahead, ensuring that your child receives the right protection at the right time ^[9][6].