Chronic Graft Versus Host Disease
What is cGVHD?
Chronic graft-versus-host disease (cGVHD) is a common and potentially life-threatening complication which develops as a result of allogeneic hematopoietic cell transplantation (HCT), when the transplanted cells react against the body of the recipient. The prevalence of this disease, unfortunately, varies from between 25–80% in long-term survivors. cGVHD can lead to serious physical and functional impairment that affects the quality of life as it is often diagnosed late in its course when the disability has already begun.
What are the Signs and Symptoms of GVHD?
Acute GVHD: In the early weeks and months after your transplant (usually within the first four months) you might notice a rash, or an upset stomach with nausea, vomiting or diarrhoea, or it could affect your liver tests, sometimes causing jaundice (yellow discolouration to the skin).
Chronic GVHD: Can happen a few months after transplant and can reoccur for several years after transplant. Like acute GVHD, it may affect your skin, gut, liver or mouth. But it can also affect other parts of your body, such as your eyes, lungs, vagina and joints. Chronic GVHD may be mild or severe, and for some people can go on for several months or even years.
What is the potential impact of musculoskeletal cGVHD on the Quality of Life (QoL) of the patients? The number of long-term survivors after allogeneic HCT has been increasing over the past years, and quality of life (QOL) has become an important end-point. The QoL in this patient group can be affected due to:
Decreased range of motion, significantly restricting a patient’s ability to perform activities of daily living. Painful joint contractures in some patients resulting in impaired function. Chronic graft versus host disease is an independent risk factor for joint destruction and associated pain and dysfunction. Some patients also show deteriorated role functioning and global QOL, increased fatigue, and skin problems. The long-term sexual complications include decreased libido, vaginal alterations, erectile and ejaculatory dysfunctions. Due to physical dysfunction, many patients also struggle to return to work post cGVHD.
==How is GVHD diagnosed?
Some GVHD may be a good thing because it means that your new immune system is working and is likely to be attacking any remaining disease cells. This can help stop the disease from coming back. You might hear this called graft versus tumour effect.
The early symptoms of GVHD are often the same as some side effects and complications after a transplant, so diagnosing GVHD can be hard. Although not definite some early signs might be clawing of the fingers in hand, reduce in ankle movement, skin changes and pain in the joints. Diagnosis is often made from your symptoms, as well as from the results of laboratory tests and tissue samples.
What are the clinical manifestations for cGVHD?
cGVHD can effect basically any organs, with the most commonly affected sites being: the skin, the mouth, the eyes, the gastrointestinal tract, the muscles and joints, the lungs, the liver, and genitalia. From a musculoskeletal point of view, the main organs involved are:
- PERIPHERAL NERVES
- BONE (Due to use of cortisone)
Manifestations typically appear within the first year after HCT. The most commonly affected joints include fingers, wrists, elbows, shoulders, ankles, and hips, with the distal joints often affected first. cGVHD is an independent risk factor for joint destruction and associated pain and dysfunction.
Sclerotic-type chronic GVHD (ScGVHD) of the skin encompasses several cutaneous presentations characterized by inflammation and progressive fibrosis of the dermis and subcutaneous tissues, resembling morphea, systemic sclerosis, or eosinophilic fasciitis. One of the other distinctive feature for chronic GVHD is depigmentation.
Loss of Muscle Strength:
- Muscle loss, most frequently a result of disuse, deconditioning, or side effects of immunosuppressive treatment, particularly corticosteroids. This can lead to strength and muscle mass decreases at a rate of about 1% per day.
- The weight bearing lower extremities and low back extensor muscles are more affected than upper extremities, making it difficult to begin ambulating after prolonged periods of rest.
- Prolonged immobility and nutrient deficiency, in concert with paraspinal muscle atrophy, can contribute to debilitating back pain.
- Steroid-induced Myopathy:
- Acute - typically occurs within 1 week of high-dose oral corticosteroid use and can be associated with rhabdomyolysis and pain.
- Chronic form occurs weeks to months into prolonged, high-dose steroid administration The patients experience general painless muscle weakness in the upper and lower extremities and the neck and usually reports finding it difficult to rise from a seated position.
As many as 50% of patients who undergo transplant develop osteopenia or osteoporosis and cGVHD is associated with an even higher incidence. This is often the result of chronic glucocorticoid use, a major risk factor for osteopenia and osteoporosis because of increased bone turnover. Other risk factors that these patients face that contribute to bone density loss are:
- Calcineurin inhibitor use, chemo and radiation therapy, gonadal dysfunction,
- Renal dysfunction,
- Increased marrow turnover due to hematogenous malignancy, and
- Decreased weight-bearing activity.
The HSCT itself causes a fundamental alteration of bone mineral metabolism, with loss seen in the first 6 to 12 months. Bone density loss in cGVHD is typically seen more in the femoral heads than the vertebrae, a distinction when compared with menopausal osteoporosis, though the humeral head, knees, and ankles can also be affected.
Lastly, patients with osteoporosis can develop hip flexor contractures due to sustained forward-flexed posture. A tight iliopsoas muscle may lead to worsening lumbar lordosis, increasing pain, and adding force being applied to vertebrae already prone to fracture.
Muscle mass and strength may be compromised because of an inflammatory myositis, mimicking polymyositis or dermatomyositis, that is a direct, immune-mediated result of cGVHD. Associated with tapering of immunosuppressant medications and is associated with the same genetic markers seen in patients with this autoimmune disease who have not undergone transplant. Typically, this presents with painful, symmetric proximal weakness.
cGVHD is associated with several possible neurologic sequelae, including mononeuropathies, generalized peripheral neuropathy, and inflammatory neuropathy. A combination of multiple neuropathy. This has also been shown to cause a neuropathic process that resembles acute inflammatory demyelinating polyneuropathy (AIDP), and is thought to be a result of direct infiltration of peripheral nerves by donor T cells.
An EMG can be diagnostic and can show demyelination, axon loss, or both. The first electromyographic sign of AIDP is an absent F-response, with subsequent findings of conduction block and denervation.
Nerve entrapment can be either by mechanical compression or fascial inflammation. As the inflamed fascia and/or skin surrounding peripheral nerves become fibrosed, the nerve may become entrapped and damaged.
Nerves at high risk for entrapment are those with little surrounding tissue, such as the ulnar nerve at the cubital tunnel and peroneal nerve at the fibular head. The median nerve at the carpal tunnel can also be damaged due to wrist flexion contractures.
In rare instances, develops when tapering immunosuppressive medication because of pre-existing autoantibodies against postsynaptic acetylcholine receptors. Most commonly seen in patients who received the HSCT for aplastic anaemia. Symptoms typically are progressive weakness with exertion, with recovery of strength after rest. Ptosis is a common first symptom and its presence along with generalized weakness. May warrant an EMG that includes repetitive stimulation studies and blood tests to detect antibodies to acetylcholine receptors.
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