Can adults with CHD develop heart failure? 

Yes, adults born with Congenital Heart Disease (CHD) can develop heart failure. In fact, heart failure is one of the leading long-term complications for the adult CHD population. It does not mean the heart has stopped working; rather, it means the heart muscle is unable to pump blood around the body efficiently enough to meet its needs. Because a heart with a congenital defect has often worked under altered pressures or had several surgical ‘repairs’ during childhood, it can gradually become tired or stiff over several decades, leading to the symptoms of heart failure. 

What We’ll Discuss in This Article 

• The physiological reasons why a ‘repaired’ heart may struggle in adulthood. 

• Recognising the early, often subtle, signs of heart failure in daily life. 

• The difference between ‘systolic’ and ‘diastolic’ issues in CHD patients. 

• How long-term valve leaks or narrowing contribute to heart strain. 

• The role of regular monitoring in detecting ‘silent’ heart failure. 

• Differentiation between heart failure and other adult health conditions. 

• Modern treatment approaches, including medications and advanced therapies. 

Why Heart Failure Occurs in Adults with CHD 

Heart failure in adults with CHD is usually a gradual process. Even after a successful childhood surgery, the heart may be left with ‘residual’ issues such as a valve that leaks slightly or a chamber that is forced to pump at a higher pressure than normal. For the first twenty or thirty years of life, the heart can often compensate for these issues. However, as the heart ages, its ‘reserve’ capacity decreases, and the muscle may eventually begin to weaken or become less flexible. 

In complex cases, such as those with a ‘single ventricle’ (like a Fontan circulation), the heart is performing double the work it was designed for. Over time, this chronic overwork can lead to the heart muscle becoming stretched (dilated) or thickened (hypertrophic), both of which reduce its efficiency. 

• Pressure Overload: The heart pumping against a narrow valve or artery. 

• Volume Overload: A leaky valve causing blood to flow backwards, making the heart pump the same blood twice. 

• Surgical Scars: Previous incisions can affect how well the heart muscle contracts. 

Recognising the Signs of Heart Failure 

In the general population, heart failure often causes dramatic breathlessness. However, in adults with CHD, the symptoms can be much more subtle and develop slowly over months or even years. Many patients unintentionally adapt their lifestyle such as taking the lift instead of the stairs without realising their heart function is declining. 

A key sign of heart failure is fluid retention (oedema). When the heart doesn’t pump efficiently, blood ‘backs up’ in the veins, forcing fluid into the body’s tissues. This is most seen as swelling in the ankles or legs, but in some CHD patients, it can also cause a bloated feeling in the abdomen. 

Symptom	Observation	What it Suggests
Increased Fatigue	Feeling unusually tired after normal daily activities.	The heart is struggling to fuel the muscles.
Oedema	Swelling in the ankles, feet, or around the eyes.	Fluid is building up due to poor circulation.
Dyspnoea	Breathlessness, especially when lying flat at night.	Fluid may be ‘backing up’ into the lungs.
Abdominal Bloating	Feeling full quickly or having a swollen tummy.	Congestion in the liver or gut vessels.
Weight Gain	A sudden increase (e.g., 2-3 lbs in a few days).	Usually a sign of rapid fluid retention.

Causes and Contributing Factors 

The ‘cause’ of heart failure in adult CHD is often a combination of the original heart defect and the natural ageing process. Adults with CHD are also susceptible to common adult problems like high blood pressure, sleep apnoea, or coronary artery disease. When these ‘acquired’ conditions are added to a congenital defect, the heart is placed under significant double-strain. 

Rhythm disturbances (arrhythmias) are another major cause. If the heart beats too fast or irregularly for a long period, it can ‘wear out’ the heart muscle, leading to what we call tachycardia-induced cardiomyopathy. This is why managing heart rhythms is a vital part of preventing heart failure in the CHD community. 

Differentiation: Heart Failure vs. Lack of Fitness 

It is common for adults with CHD to wonder if they are simply ‘out of shape’ or if their heart is failing. 

Lack of Fitness 

Breathlessness occurs during intense exercise but improves quickly with rest. There is no swelling in the ankles, and the person can usually lie flat at night without feeling short of breath. 

Heart Failure 

Breathlessness may occur with minimal effort, such as dressing or walking on flat ground. It is often accompanied by a persistent cough or the need to prop oneself up with extra pillows at night to breathe comfortably. If you notice a ‘disproportionate’ drop in your ability to exercise compared to a few months ago, it is a sign that requires medical investigation. 

To Summarise 

In my final conclusion, heart failure is a significant risk for adults with CHD, but it is a condition that can often be managed effectively if caught early. It is usually the result of long-term strain on a heart that has been ‘repaired’ but not ‘cured’. Regular reviews at an Adult Congenital Heart Disease (ACHD) centre are essential for monitoring your heart’s pumping function and fluid levels. With modern medications and early intervention, many adults with heart failure can maintain a good quality of life for many years. 

If you experience severe, sudden, or worsening symptoms, such as fainting, sudden crushing chest pain, or extreme difficulty breathing (especially if you feel like you are ‘drowning’ while lying down), call 999 immediately. 

Authority Snapshot (E-E-A-T Block) 

This article was written by Dr. Stefan Petrov, a UK-trained physician with experience in general medicine and emergency care. It addresses the clinical complexities of heart failure in the context of congenital defects. The content is informed by the 2026 ‘BCCA Guidelines on the Management of Heart Failure in ACHD’, which emphasizes that ‘early pharmacological intervention and proactive valve management are the cornerstones of preventing end-stage heart failure in the ageing CHD population’.