Introduction
Background
Scleroderma is derived from the Greek words skleros (hard or indurated) and derma (skin). Hippocrates first described this condition as thickened skin.1 Carlo Curzio (1752) offered the first detailed description of scleroderma in a patient with hard skin, which he described as woodlike or as containing a dry hide. In 1836, Giovambattista Fantonetti applied the term scleroderma to a patient's condition.2 He applied the term to describe a patient with dark leatherlike skin who exhibited a loss of range of joint motion due to skin tightening. Robert H. Goetz first described in detail the concept of scleroderma as a systemic disease in 1945; he introduced the term progressive systemic sclerosis to emphasize the systemic and often progressive nature of the disease.
Definition
The term systemic sclerosis is used to describe a systemic disease characterized by skin induration and thickening accompanied by various degrees of tissue fibrosis and chronic inflammatory infiltration in numerous visceral organs, prominent fibroproliferative vasculopathy, and humoral and cellular immune alterations.
The American College of Rheumatology (ACR) criteria for the classification of systemic sclerosis require one major criterion or two minor criteria, as follows:
- Major criterion: Proximal scleroderma is characterized by symmetric thickening, tightening, and induration of the skin of the fingers and the skin that is proximal to the metacarpophalangeal or metatarsophalangeal joints. These changes may affect the entire extremity, face, neck, and trunk (thorax and abdomen; see Images 1-2).
- Minor criteria
- Sclerodactyly is characterized by thickening, induration, and tightening of the skin, limited to only the fingers.
- Digital pitting scars or a loss of substance from the finger pad: As a result of ischemia, depressed areas of the fingertips or a loss of digital pad tissue occurs.
- Bibasilar pulmonary fibrosis includes a bilateral reticular pattern of linear or lineonodular densities most pronounced in basilar portions of the lungs on standard chest roentgenography. These densities may assume the appearance of diffuse mottling or a honeycomb lung and are not attributable to primary lung disease.
Pathophysiology
Systemic sclerosis is a systemic disease that affects many organ systems. It is most obvious in the skin; however, the GI tract; the respiratory, renal, cardiovascular, and genitourinary systems; and numerous vascular structures are frequently involved. The symptoms result from inflammation and progressive tissue fibrosis and occlusion of the microvasculature by excessive production and deposition of types I and III collagens. The levels of other macromolecules (eg, glycosaminoglycans, tenascin, fibronectin) found in the connective tissue are also increased.
The vascular alterations show a predilection for the small arteries and arterioles. Vascular dysfunction is one of the earliest alterations of systemic sclerosis and may represent the initiating event in its pathogenesis. Severe alterations in small blood vessels of skin and internal organs, including fibrosis and perivascular cellular infiltration with activated T cells, are almost always present in systemic sclerosis.
Frequency
United States
The estimated incidence of systemic sclerosis is 19 cases per million population, and the prevalence of systemic sclerosis has been estimated at 240 cases per million population, although the reported prevalence has ranged from 138 to 286 cases per million population. The prevalence has increased because of earlier detection through better diagnosis and an increased survival rate. Obtaining an exact estimate of prevalence is difficult because systemic sclerosis is frequently misdiagnosed. Juvenile-onset systemic sclerosis is uncommon and usually presents as an overlap syndrome with myositis. In the United States, the prevalence of systemic sclerosis has been reported to be as high as 400 cases per million women aged 35-65 years.
International
Systemic sclerosis is found worldwide.
Mortality/Morbidity
Pulmonary hypertension and scleroderma renal crisis are the most frequent causes of mortality. Survival averages 12 years from diagnosis and correlates best with the clinical disease subtype (diffuse cutaneous vs limited cutaneous) and extent of organ involvement.
- The limited cutaneous subset carries a 10-year survival rate of 71%.
- The diffuse cutaneous subset carries a 10-year survival rate of 21%.
- Pulmonary hypertension is a major prognostic factor for survival.
Race
Systemic sclerosis affects individuals of all races.
- The risk of systemic sclerosis in blacks is slightly higher than in whites; in young black women, the risk is 10 times higher.
- Incidence rates among ethnically related groups who are geographically separate show some discrepancy. The incidence of systemic sclerosis is lower in native Nigerians than in African Americans. Oklahoma Choctaw Indians have an incidence of 472 cases per million population, which is higher than that of the Missouri Choctaw Indians. These differences may be due to environmental exposures or differences in genetic predisposition.
Sex
The risk of systemic sclerosis is 3-9 times higher in women than in men.
Age
The peak onset occurs in individuals aged 30-50 years.
Clinical
History
- Skin (see Images 1-3)
- Diffuse pruritus
- Skin tightness and induration (see Images 1-2)
- Skin pigmentary changes (hyperpigmentation or hypopigmentation; see Image 3)
- Vascular system
- Raynaud phenomenon (70% of patients with systemic sclerosis initially present with this symptom; 95% eventually develop it during the course of their disease)
- Healed pitting ulcers in fingertips
- Cutaneous and mucosal telangiectasis
- Gastrointestinal system
- Gastroesophageal reflux caused by lower esophageal sphincter (LES) incompetence and decreased or absent peristalsis in the lower two thirds of the esophagus (may lead to hoarseness, aspiration pneumonia, and dysphagia)
- Dyspepsia, bloating, and early satiety
- Constipation alternating with diarrhea (may lead to malabsorption)
- Respiratory system
- Progressive dyspnea
- Chest pain (precordial) due to pulmonary artery hypertension
- Dry persistent cough due to restrictive lung disease
- Musculoskeletal system3
- Arthralgia
- Myalgia
- Loss in joint range of motion
- Symptoms of carpal tunnel syndrome
- Muscle weakness
- Cardiovascular system
- Dyspnea due to pericardial effusion, congestive heart failure, or myocardial fibrosis
- Palpitations, irregular heart beats, and syncope due to conduction abnormalities
- Congestive heart failure
- Genitourinary system
- Erectile dysfunction
- Dyspareunia (if introitus is affected)
- Ears, nose, and throat
- Sicca syndrome
- Poor dentition due to sicca syndrome
- Loosening of dentition due to alteration in the tooth suspensory ligament and thickening of the periodontal membrane
- Hoarseness due to acid reflux or vocal cord fibrosis
- Endocrine system -Hypothyroidism
- Renal system
- Hypertension
- Renal crisis
- Chronic renal insufficiency
- Neurologic
- Constitutional
- Fatigue
- Weight loss
Physical
- Skin
- Skin pigmentary changes include a salt-and-pepper appearance, with areas of hyperpigmentation alternating with hypopigmentation, or an overall appearance of tanned skin that persists long after sun exposure (see Image 3).
- Telangiectasias are dilated vessels located just beneath the dermis on any skin area, but they are most obvious in the face (perioral area), hands, and anterior chest.
- The skin of the hands may be edematous or swollen early in the disease, and the patient may initially report this as puffy changes. This edematous stage precedes the indurated sclerotic stage; longer time to progression to the sclerotic phase indicates a better prognosis. A rapid progression of sclerosis is associated with a worse prognosis and, often, more extensive and aggressive visceral organ involvement with an increased risk of renal crisis development.
- In the sclerotic phase, the skin may appear tight and shiny, with a characteristic loss of hair, decreased sweating, and loss of the ability to make a skin fold. This process of thickening generally begins distally on the fingers. Structures such as skin creases and dorsal veins begin to fade. The skin induration usually progresses proximally in a continuous symmetrical fashion.
- Calcinosis may develop on the fingers and extremities, usually the extensor side of the forearms and the prepatellar areas; however, any area can be affected (see Image 4).
- Limited cutaneous systemic sclerosis involves areas distal to the elbow and knee but may involve the face and neck. CREST (calcinosis, Raynaud phenomenon, esophageal dysmotility, sclerodactyly, and telangiectasias [not all are needed to be called CREST]) syndrome is an older term used to describe this subset of limited cutaneous systemic sclerosis.
- Diffuse cutaneous systemic sclerosis refers to skin thickening on the trunk and proximal aspects of the extremities in addition to the face.
- Reduced oral aperture (microstomia) due to perioral involvement (measure incisor-to-incisor distance) may develop.
- Edema may be the result of hydrophilic glycosaminoglycan deposits in the dermis. These changes (edema) may also reflect vascular changes, inflammation, and hydrostatic changes. The mechanism by which the edema resolves is not clear. Possibly, the edema becomes less apparent owing to a reduction of the hydrophilic glycosaminoglycan deposits as they are replaced by the less hydrophilic fibrous collagens. Alternatively, the edema does not resolve but becomes clinically less apparent because of dermal thickening. The edema usually does not improve with the use of diuretic therapy.
- Eyes, ears, nose, and throat
- Salivary production may be decreased and spontaneous sublingual pooling of saliva may be absent.
- Xerostomia and xerophthalmia may be part of the examination findings. A confirmatory minor salivary gland biopsy may show fibrosis without the pronounced lymphocytic aggregates that would be expected with primary Sjögren syndrome. In addition, patients with systemic sclerosis typically do not harbor anti-Ro and anti-La antibodies.
- Oropharyngeal and esophageal cancers are more common in persons with diffuse systemic sclerosis.4,5,6
- Vascular changes
- Raynaud phenomenon results in characteristic color changes of pallor, cyanosis, and then redness (white, blue, red), which are accompanied by numbness, tingling, or pain. These events may be triggered by cold, smoking, or emotional stress. Subintimal hyperplasia, typically present in systemic sclerosis vessels, can reduce the luminal diameter by more than 75%, limiting blood flow. This baseline reduction, in addition to the natural response to cold, accounts for the exaggerated response.
- Raynaud phenomenon occurs in 5-15% of the general population. The female-to-male ratio is 4:1, with onset occurring during the teenaged years.
- Raynaud phenomenon may precede obvious systemic sclerosis features by months or even years. Symptoms may last longer than 2 years. If this occurs without the development of characteristic connective-tissue diseases, a benign primary Raynaud phenomenon is generally indicated, with an excellent prognosis. However, 5-10% of this population may eventually develop systemic sclerosis.
- Infarction and dry gangrene may be due to severe vasospasm or to structural vascular occlusion. This process usually involves the digits but can also involve the lips, nose, and ears.
- Nail-fold capillary microscopy demonstrates fewer capillaries than normal (ie, capillary loop drop [see Image 5]) and numerous dilated capillary loops.
- Musculoskeletal system3
- Patients may present with generalized arthralgias and morning stiffness that may mimic other systemic autoimmune diseases. Clinically apparent synovitis is uncommon. Hand and joint function may decline over time because of skin tightening rather than arthropathy. Tendon friction rubs are found almost exclusively in diffuse systemic sclerosis and may be detected as the tendon is moved actively or passively.
- The following palpable tendon friction rubs may be found:
- Shoulder - Scapula
- Elbow - Olecranon
- Knee - Patella
- Wrists - Flexor or extensor
- Fingers - Flexor or extensor (rare)
- Ankle - Anterior tibia, posterior tibia, peroneal, Achilles
- Myositis may cause weakness and muscle wasting. Levels of serum creatine kinase (CK) and aldolase are elevated.
- Acroosteolysis (ie, resorption or dissolution of the distal end of the phalanx) may occur.
- Flexion contractures of any affected joint may occur.
- Respiratory system
- Dry rales may be the only physical examination finding that suggests pulmonary involvement in systemic sclerosis.
- An accentuated pulmonic secondary heart sound (P2) or right ventricular heave may indicate the presence of pulmonary artery hypertension.
- Transthoracic echocardiography is a noninvasive study for assessing pulmonary artery pressure. A systolic pulmonary artery pressure of greater than 35 mm Hg is considered to represent pulmonary artery hypertension. However, right-sided heart catheterization provides the most accurate pulmonary artery pressure (see Imaging Studies).7
- Pulmonary function testing is important in all patients with systemic sclerosis, although lung volumes can correlate poorly with extent of interstitial lung disease. Results of pulmonary function testing are ultimately abnormal in 80% of the patients. Carbon monoxide diffusion capacity (DLCO) is very sensitive and helps establish organ involvement at an earlier stage. Pulmonary function tests may demonstrate a decreased forced vital capacity and total lung capacity and a low DLCO. These changes reflect fibrotic infiltration in the lung (see Images 6-7). An isolated or disproportionate reduction of DLCO with a ratio of forced vital capacity (FVC) or total lung capacity (TLC) to DLCO of greater than 1.6 indicates pulmonary vascular fibrosis and vascular obliteration that leads to pulmonary hypertension.
- A high-resolution CT scan (HRCT) is highly sensitive for revealing pulmonary involvement (see Imaging Studies). It may demonstrate a ground-glass appearance in areas of active alveolitis or septal fibrosis and honeycombing in areas of interstitial fibrosis. Patients with normal initial HRCT findings have a good long-term prognosis.8
- Patients are at risk for aspiration pneumonia due to lower esophageal sphincter incompetence.
- Gastrointestinal system
- Reflux due to decreased lower esophageal sphincter pressure
- Severe esophagitis
- Barrett metaplasia (can lead to cancer)
- Candida esophagitis
- Esophageal strictures
- Gastric vascular antral ectasia (dilated submucosal capillaries), also known as watermelon stomach
- Primary biliary cirrhosis (PBC) associated with antimitochondrial antibodies (Studies have shown that liver dysfunction in patients with PBC and systemic sclerosis may progress more slowly than in patients with PBC alone.9 )
- Wide-mouth colonic diverticula
- Malabsorption
- Atrophy of smooth muscle and fibrotic changes leading to decreased peristalsis throughout the GI tract (gastroesophageal reflux disease [GERD], gastroparesis, constipation, pseudo-obstruction; see Image 8)
- Anal sphincter incompetence
- Renal system
- Patients with diffuse, rapid skin involvement have the highest risk (approximately 20-25%) of developing scleroderma renal crisis. Renal crisis occurs in about 10% of all patients with systemic sclerosis.
- Renal crisis presents as accelerated hypertension, oliguria, headache, dyspnea, edema, and rapidly rising serum creatinine levels.
- Approximately 10% of renal crisis cases occur in the absence of an elevated blood pressure.
- Renal crisis is observed within 4 years of diagnosis in about 75% of patients but may develop as late as 20 years after diagnosis. Renal crises are slightly more common in black than in whites, and men have a greater risk than women.
- Scleroderma renal crisis that is not treated aggressively invariably leads to renal failure, requiring dialysis or renal transplantation, or even death.
- Preventing renal crisis is critical. Check blood pressure, monitor serum creatinine, and start angiotensin-converting enzyme (ACE) inhibitors early in at-risk patients.
- Avoid high doses of corticosteroids since this is a significant risk factor for renal crisis.
- Cardiovascular system
- Cardiac involvement indicates a worse prognosis. Pericardial effusion is usually asymptomatic and may develop in up to one third of patients with systemic sclerosis. Clinically significant pericarditis is rare.
- Cor pulmonale may develop secondary to long-standing pulmonary fibrosis or pulmonary artery hypertension.
- Conduction abnormalities, including complete A-V block, may be revealed with routine ECG or, more frequently, with 24-hour Holter monitor or echocardiography.
- Infiltrative cardiomyopathy with replacement of cardiac muscle by fibrous tissue can lead to arrhythmias, heart failure, or both.
- Contraction band necrosis results from global ischemia and reperfusion. Patients may have recurrent episodes of vasospasm that are caused by the same mechanism involved in Raynaud phenomenon. This process can lead to cardiomyopathy and heart failure.
- Neurologic system: Trigeminal neuralgia (uncommon) and carpal tunnel symptoms may result from peripheral entrapment neuropathies. Although rare, sensory neuropathies unrelated to entrapment may be present.
- Obstetrics and gynecology
- Women may experience vaginal dryness, dyspareunia, and menstrual irregularities.
- Pregnancy in women with systemic sclerosis is considered a high risk because of a higher risk of pregnancy loss and higher complication rates, but a diagnosis of systemic sclerosis is not an absolute contraindication for pregnancy. A study of 50 patients (67 pregnancies) showed that 18% miscarried, 26% delivered preterm, and 55% delivered at full term. Pregnancy risk is greatest in those who have had the disease for less than 4 years and who also have diffuse cutaneous involvement.
- Some symptoms may increase during pregnancy (eg, edema, arthralgias, GERD). Skin manifestations are not reported to worsen, but the data on this matter are incomplete. Raynaud symptoms may improve during pregnancy, only to worsen after delivery.
- Certain medications, such as D-penicillamine, cytotoxic agents, and ACE inhibitors, should be discontinued prior to pregnancy.
- Genitourinary system
- Erectile dysfunction is common in males and is the presenting symptom in some cases.
- Urinary bladder infiltration may cause microhematuria.
Causes
- The exact etiology of systemic sclerosis is unclear; however, the following pathogenic mechanisms are always present:
- Endothelial cell injury
- Fibroblast activation
- Cellular and humoral immunologic derangement
- Environmental factors (eg, triggers or accelerators) for the development of systemic sclerosis include the following:
- Silica exposure
- Solvent exposure (vinyl chloride, trichloroethylene, epoxy resins, benzene, carbon tetrachloride)10
- Radiation exposure or radiotherapy
- Cytomegalovirus, human herpesvirus 5, and parvovirus B19 have been proposed as viral accelerating factors, but evidence of their involvement is inconclusive.
- Drugs: Bleomycin and pentazocine may be involved in the development of systemic sclerosis.
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Further Reading
Keywords
scleroderma, systemic sclerosis, proximal scleroderma, diffuse cutaneous scleroderma, limited cutaneous scleroderma, diffuse systemic scleroderma, progressive systemic sclerosis, hard skin, skin tightening, skin tightness, sclerodactyly, bibasilar pulmonary fibrosis, Raynaud phenomenon, Raynaud's phenomenon, pulmonary hypertension, calcinosis, esophageal dysmotility, telangiectasias, CREST, juvenile-onset systemic sclerosis
Overview: Scleroderma