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Deficientia alpha-1-antitrypsini
A hidden cause of lung disease in young or never-smoking people — a single blood test brings clarity.
Also known as: Alpha-1 · AAT deficiency · hidden cause of COPD · early emphysema · SERPINA1
Open in the tool — with search and all the links →This compilation is for information and replaces neither medical diagnosis nor treatment. If you have symptoms, see a doctor.
An inherited disorder in which a protective protein from the liver is missing or does not work properly. Alpha-1 antitrypsin normally restrains enzymes that break down tissue during inflammation. Without this protection these enzymes attack the fine air sacs — emphysema develops over years, often at an age where one does not expect it. That is why this disease counts as a hidden cause of COPD: if a chronic airway disease appears in younger people, in non-smokers, or in people who smoked far less than the extent of damage would explain, alpha-1 should be thought of. Breathlessness stubbornly treated as asthma without proper response also belongs here. Because the faulty protein is made in the liver and can clump there, the liver is affected too — from unexplained raised liver values to cirrhosis, in some already in childhood. The trait is inherited via two gene copies, with severity depending strongly on the combination. And the diagnosis is remarkably simple: a single blood test measuring the alpha-1 antitrypsin level, supplemented by genetic typing. Nevertheless years often pass before the right classification. Why this is worthwhile: smoking accelerates the course dramatically — stopping smoking is by far the most effective lever here. Added to this are early treatment of infections, exercise and lung rehabilitation, and in selected cases replacement therapy with the missing protein. And because it is an inherited trait, siblings and children should know their value too.
Smoking dramatically accelerates the breakdown of lung tissue in alpha-1 — far more than in people without this trait. No other step comes close.
A single blood test is enough for the first step. It is recommended especially with early COPD, in non-smokers, with an unusually severe course and with emphysema in the lower lung fields.
Because the protein is made in the liver and can clump there, liver values and if needed an ultrasound belong to follow-up — regardless of how the lungs are doing.
Every airway infection means inflammation — and thus exactly those enzymes against which protection is missing. Acting quickly with infections is therefore more than routine.
Dust, fumes and smoke put extra strain on the lungs. Where possible, protection or an adjustment of the job is worthwhile — this is not over-caution but preserving substance.
Because it is an inherited trait, the simple blood test is worthwhile in close relatives — the earlier someone knows, the more lung tissue can be preserved.
Replacement of the missing protein is given as a weekly infusion; it slows the breakdown of the lung, it rebuilds nothing — lost air sacs do not come back. What most determines the course is something else: smoking speeds the loss many times over with this deficiency, and stopping achieves more than any drug. In the liver form there is no replacement, because there the problem is the build-up inside the liver cell.
About one in two to five thousand people in Europe is severely affected. Lung symptoms begin in smokers usually between thirty and forty, in non-smokers between fifty and sixty — that twenty-year gap is the single clearest figure. The blood level is measured once; under 0.5 g/l counts as markedly low. COPD before the age of forty-five or without smoking leads to that measurement.
A chronically narrowed lung before the age of forty-five, or in someone who has never smoked. That is the point at which one blood test once in a lifetime is worthwhile.
On the image the over-inflation shows mainly in the lower fields — in ordinary smoker’s emphysema rather at the top. That difference stands out in the reading.
A lasting jaundice in the infant, or in the adult a cirrhosis without alcohol and without a virus. Lung and liver belong together in this illness, even if only one stands out.
If the trait is found in one person, testing the closest relatives is worthwhile — because the same single lever applies to them: do not smoke and avoid smoke.
Unexplained raised liver values can be the second side of this disease — lung and liver belong thought of together.
Accompanying with liver involvement; helps together with ALT to keep the liver in view.
Rises with airway infections — which here belong treated early and consistently, because every infection can cost lung tissue.
Low levels are common in chronic airway illnesses and go along with more infections. Correcting a deficiency is simple; for lung function itself it is no replacement for treatment.
Relaxes the smooth muscle of the airways — which is why it is also given as an infusion in an emergency. For everyday use the tablet replaces no inhaler.
Drinking enough keeps the mucus thin and easier to cough up. That is the simplest and most often overlooked lever with sticky sputum.
The breathing muscles are muscle too. With chronic breathlessness the need for energy and protein is raised, and a loss of weight clearly worsens what one can manage.
The honest ranking: no preparation comes near what stopping smoking achieves here. With this deficiency smoking shortens life expectancy by decades instead of years, because precisely the protection is missing that keeps the lung safe from its own enzymes. Everything else comes after.
In advanced lung disease a low level is the rule, and it hangs together with muscle strength and endurance. Measured and replaced — on lung function itself no reliable effect is shown.
In ordinary chronic bronchitis NAC at a higher dose — 1 200 mg daily over a year — slightly lowers the number of flare-ups. For this particular deficiency there are no separate data; the missing protective substance is not replaced by it.
Effective when deficient; effects on sleep and stress plausible but moderate. Too much causes loose stool.
The level of this protein rises in pregnancy, on the pill and with any inflammation. A test can therefore come out falsely normal in that time — when it is measured decides what it says.
In this deficiency the misfolded protein builds up in the liver. Alcohol burdens it further — the recommendation is clearer here than with a healthy liver.
Being underweight worsens the outlook in emphysema. Energy-dense food in small portions is the goal here — not losing weight.
In emphysema pursed-lip breathing prevents the small airways from collapsing on breathing out. Stopping smoking remains by far the biggest lever — more so in this deficiency than in any other.