# Heart disease caused by amyloidosis
What is it
Cardiac amyloidosis is a disease in which abnormal protein crystals (amyloid) deposit in heart tissue. These crystals form from proteins that no longer function properly. The result is that the heart becomes stiffer and thicker, making it harder to pump and relax. The disease is among rare conditions.
There are different forms. The most common are:
- **AL amyloidosis**: the letters stand for "amyloid light chain". The body produces misshapen light chains of antibodies that accumulate. This can happen without another underlying condition, but sometimes a blood cancer plays a role.
- **TTR amyloidosis**: the protein transthyretin (TTR) becomes misshapen. This can be hereditary (familial) – in which case children inherit the gene – or develop without a hereditary cause (wildtype).
In TTR amyloidosis without hereditary predisposition, one speaks of wildtype TTR amyloidosis; this occurs mainly in older men. The hereditary form (familial) can occur at a younger age.
Causes
The cause differs by form:
**AL amyloidosis** occurs because bone marrow abnormally produces many misshapen light chains. This can happen spontaneously. Sometimes there is an underlying blood cell disorder behind it, such as a certain form of myeloma. The exact reason why this happens is not yet fully understood.
**TTR amyloidosis (hereditary)** is caused by a change in the gene that codes for the protein transthyretin. This gene was inherited from a parent. It is estimated that about half of the children of an affected parent have the same gene mutation, although not everyone with that mutation automatically becomes ill.
**TTR amyloidosis (wildtype)** develops without hereditary predisposition. The protein transthyretin – normally produced by the liver – starts to misfold on its own, especially as you get older. This is being noticed more frequently.
How the disease progresses
The disease progresses gradually. Amyloid crystals slowly accumulate in heart tissue. This process can take years before noticeable symptoms develop, especially in wildtype TTR amyloidosis.
As more amyloid accumulates:
- Heart tissue becomes stiffer and thicker (this is called "restrictive cardiomyopathy").
- The heart has difficulty receiving and pumping enough blood.
- Pressure in the heart rises, causing backflow into the veins and lungs.
- Heart rhythm disturbances can develop, including atrial fibrillation (an irregular heartbeat).
The speed of progression varies greatly from person to person. AL amyloidosis typically worsens faster than TTR amyloidosis. Within the TTR forms, the hereditary form is often more aggressive than wildtype.
In recent years, medications have become available that can slow or, in some cases, halt the deposition process.
Symptoms by phase
**Early phase**
In this phase, there is often still no visible damage on tests. Many people have no symptoms. If symptoms are present, they can be subtle: persistent fatigue, mild shortness of breath on exertion, or a heavy feeling in the chest.
**Later phase – heart failure**
- Severe shortness of breath, even at rest or at night
- Fatigue that limits daily activities
- Swelling of feet, ankles, and legs (due to fluid buildup)
- Abdominal swelling
- Heart palpitations or irregular heartbeat
**Advanced phase**
- Severe exercise intolerance (little exertion needed for severe shortness of breath)
- Continuous fluid buildup despite medication
- Fainting or dizziness
- Sleep problems due to nighttime shortness of breath
In AL amyloidosis, symptoms from other organs can also occur (kidneys, nerves, digestion), because amyloid can also deposit there. In TTR amyloidosis in the hereditary form, nerve problems can occur.
What it means for daily life
Daily life changes significantly, depending on how far the disease has progressed.
**Movement and exercise**
In the early stages, normal daily activities are usually still possible. As the disease progresses, strenuous activities – sports, heavy housework, long walks – often have to be scaled back or avoided entirely. The body gives signals when it has had enough.
**Salt and fluid restriction**
Many patients must limit their salt intake and sometimes their food fluid intake, because this worsens fluid accumulation. This requires new habits in cooking and eating.
**Medication and check-ups**
Treatment usually consists of multiple medications for heart failure (beta-blockers, diuretics, anti-arrhythmic drugs) and possibly amyloid-specific medications. These must be regularly adjusted and modified. This means regular hospital visits and blood tests.
**Mental burden**
Learning to cope with a chronic, serious disease and the uncertainty surrounding it is psychologically taxing for many people. Some experience anxiety, sadness, or grief over loss of health.
**Work and social activities**
As the disease progresses, working becomes increasingly difficult. Many patients have to reduce their working hours or stop working altogether. Social activities can become limited due to fatigue and the need for rest.
**Family and heredity (in hereditary form)**
For patients with hereditary TTR amyloidosis, it is important to know that blood relatives can be checked with genetic screening. This can be emotionally complex.
Outlook
The outlook depends on which form you have, how quickly the disease progresses, and what other health problems are present.
**AL amyloidosis**
This form usually progresses faster. Without treatment, heart failure usually advances fairly quickly. With modern treatment – aimed at slowing the production of misfolded proteins – many patients achieve sustained response. Recent studies indicate that rapid diagnosis and early treatment are favourable. At the population level, average survival without modern therapy was a few years; with current treatment this has been significantly extended, although this varies greatly per person.
**TTR amyloidosis (hereditary)**
Without treatment, this form also progresses. With modern medications that slow or inhibit the deposition process, many patients see stabilisation or even improvement of symptoms. Younger patients can live for decades to come.
**TTR amyloidosis (wild-type)**
This form generally progresses more slowly than the hereditary forms, especially in the years before heart failure manifests itself clearly. Many elderly people have this for years without major complaints. Once heart failure manifests, it can be progressive. Modern treatment also helps many patients here.
**General**
The outlook has improved significantly in recent years due to:
- Better early detection (more attention to amyloidosis, better imaging)
- Medications that inhibit the amyloid deposition process
- Better heart failure support
Nevertheless, this remains a serious condition requiring continuous monitoring and treatment. How quickly someone's situation changes is highly individual.
Frequently asked questions
**Is cardiac amyloidosis hereditary?**
The hereditary form (familial TTR amyloidosis) is hereditary: you inherit a gene mutation. But not everyone with that mutation becomes ill. AL amyloidosis is usually not hereditary – it occurs spontaneously. Wild-type TTR amyloidosis is also not hereditary. If in doubt, genetic testing can provide clarity.
**Can your heart recover if amyloid is removed from it?**
Unfortunately not completely. If amyloid deposition stops completely (through effective treatment), the heart tissue can partially recover and become more flexible. But the damage that has already occurred does not disappear entirely. This is why early diagnosis and treatment are important – to prevent further damage.
**What is the difference between AL and TTR amyloidosis?**
In AL amyloidosis, something goes wrong in the bone marrow, causing malformed antibodies to form. In TTR amyloidosis, it involves the protein transthyretin that folds incorrectly. AL typically progresses faster and more aggressively. TTR progresses more slowly, especially wildtype TTR. Treatment also differs: AL targets the bone marrow, TTR treatment aims to prevent the protein from folding incorrectly.
**What can I do myself to feel better?**
Take medication faithfully, inform your doctor about new symptoms, adjust your diet and fluid intake as advised, ensure you get rest, and follow regular check-ups. Seeking support (psychological, support from loved ones) helps greatly. Each situation is different; your own doctor can best tell you what is relevant for you.
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_This information never replaces a doctor's judgment. Always discuss your situation with your own healthcare provider._