Medicines for Compartment syndrome

What it is

Compartment syndrome is a condition in which pressure builds up within a "compartment" of muscle — a group of muscles enclosed within a tough, non-stretchy membrane (fascia), most commonly in the legs or arms. Because the compartment cannot expand, an increase in pressure inside it (from swelling or bleeding) can compress the blood vessels, nerves, and muscles within, reducing the blood supply and, if not relieved, damaging the tissues. There are two main forms, which are very different. Acute compartment syndrome is a serious medical emergency: it develops rapidly, usually after a significant injury (such as a bad fracture, a crush injury, or severe bruising) that causes bleeding or swelling within a muscle compartment, though it can have other causes. The pressure builds up quickly and can rapidly damage the muscles and nerves, so it needs urgent treatment. The key symptoms are severe pain — often much worse than would be expected from the injury, and typically worsened by stretching the affected muscles — along with, as it progresses, other features such as tightness, tingling, numbness, or a change in the affected limb; the classic warning is pain out of proportion to the injury. Because acute compartment syndrome can cause permanent damage (to muscles and nerves) if not treated quickly, it is a surgical emergency — the treatment is an urgent operation (a fasciotomy) to cut open the fascia and release the pressure. Chronic (exertional) compartment syndrome is a different, non-emergency condition: it causes pain, tightness, and sometimes other symptoms in a muscle compartment (often in the lower legs) that come on with exercise and ease with rest, because the pressure in the compartment rises with exertion; it is common in athletes and people who do repetitive exercise, and is not an emergency, though it can affect activity, and is managed with measures such as modifying activity and, in some cases, surgery. The key messages are that compartment syndrome is raised pressure within a muscle compartment, that the acute form (usually after injury) is a medical emergency needing urgent surgery (with severe pain out of proportion to the injury being the key warning), and that the chronic exertional form is linked to exercise and is managed differently.

How it is treated

Acute compartment syndrome is a surgical emergency needing urgent surgery to release the pressure, while chronic exertional compartment syndrome is managed with activity modification and, in some cases, surgery; recognising which form is present is crucial. For acute compartment syndrome, prompt recognition and treatment are critical, as delay can cause permanent muscle and nerve damage: it should be suspected when there is severe pain — particularly pain that is out of proportion to the injury and worsened by stretching the affected muscles — after a significant injury (such as a fracture or crush injury), along with tightness and, as it progresses, tingling, numbness, or other changes in the limb; this is a medical emergency needing urgent hospital assessment. Diagnosis is based on the clinical features (the severe, disproportionate pain and other signs), and sometimes by measuring the pressure within the compartment, but treatment should not be delayed if it is strongly suspected. The treatment is an urgent operation called a fasciotomy — cutting open the fascia (the tough membrane enclosing the compartment) to release the built-up pressure and restore the blood supply, which relieves the pressure and prevents further damage; this is done as an emergency, and the wound is managed and closed later. Prompt treatment gives the best chance of preserving the muscle and nerve function. Because acute compartment syndrome can develop after injuries, people with significant injuries (and those caring for them) should be alert to the warning signs, particularly severe, worsening pain out of proportion to the injury, and seek urgent help. Chronic (exertional) compartment syndrome is managed very differently, as it is not an emergency: it is diagnosed based on the pattern of exercise-related pain and tightness (and sometimes by measuring compartment pressures during or after exercise), and management usually starts with conservative measures — such as modifying or reducing the triggering activity, addressing technique and training factors, physiotherapy, and other measures; for people whose symptoms persist and significantly affect their activity despite these measures, surgery (a fasciotomy to release the compartment) may be considered, which can be effective. The reassuring but important messages are that acute compartment syndrome is a medical emergency where urgent surgery to release the pressure preserves the muscle and nerve function (so recognising severe pain out of proportion to an injury and seeking urgent help is vital), while chronic exertional compartment syndrome is a non-emergency, exercise-related condition managed with activity modification and, if needed, surgery; so recognising which form is present, and — for the acute form — urgent treatment, are the keys to managing compartment syndrome.