Microscopic Polyangiitis Clinical Presentation
- Author: Mehran Farid-Moayer, MD; Chief Editor: Vecihi Batuman, MD, FACP, FASN more...
History
Symptoms of microscopic polyangiitis (MPA) include the following:
- Constitutional symptoms
- Fever (55%)
- Malaise, fatigue, flulike syndrome
- Myalgia (48%)
- Weight loss (72%)
- Skin manifestations - Skin rash (50%)
- Pulmonary manifestations
- Hemoptysis (11%)
- Dyspnea
- Cough
- Cardiovascular manifestations – Chest pain, symptoms of heart failure
- Gastrointestinal involvement
- Gastrointestinal bleeding
- Abdominal pain
- Nervous system manifestations
- More commonly, peripheral nervous system involvement manifesting as mononeuritis multiplex (57%)
- CNS involvement manifesting as seizures (11%)
- Arthralgias (10-50%)
- Myalgias (40%)
- Testicular pain (2%)
- Ocular manifestations (1%)
- Red eye
- Ocular pain
- Decreased visual acuity
- Symptoms of sinusitis (1%)
Physical
The physical examination findings include the manifestations of specific organ system involvement. A dermato-pulmonary-renal syndrome is the feature of the disease.
- Fever
- Skin involvement
- Leukocytoclastic angiitis and its palpable purpura (Leukocytoclastic purpura could be a manifestation of the systemic vasculitides or could be a stand-alone skin disorder (see image below.)
Leukocytoclastic angiitis. - Palpable purpura (41%)
- Livedo reticularis (12%)
- Skin ulcerations
- Necrosis and gangrene
- Necrotizing nodules
- Urticaria
- Digital ischemia (7%)
- Urticaria - Vasculitis-associated urticaria that lasts longer than 24 hours
- Leukocytoclastic angiitis and its palpable purpura (Leukocytoclastic purpura could be a manifestation of the systemic vasculitides or could be a stand-alone skin disorder (see image below.)
- Lower respiratory system
- Pulmonary rales
- Respiratory distress
- Upper respiratory tract - Sinusitis less frequent than in Wegener granulomatosis
- Cardiovascular system
- Hypertension (34%)
- Signs of cardiac failure (17%)
- Myocardial infarction (2%)
- Pericarditis (10%)
- Gastrointestinal system
- Gastrointestinal bleeding
- Bowel ischemia and perforation
- Pancreatitis
- Ocular involvement (1%)
- Retinal hemorrhage
- Scleritis
- Uveitis
- Renal involvement - Signs of uremia in advanced renal failure (Eight percent of patients with MPA present with renal failure and require hemodialysis.)
- Musculoskeletal system
- Synovitis
- Arthritis
- Nervous system
- Mononeuritis multiplex - Most frequent neurologic manifestation of the disease (57%)
- CNS involvement - Includes meningeal vasculitis (11%)
- Other organ vasculitis - Orchitis (2%)
Causes
- Based on current understanding of the inflammatory response, cytokine-mediated changes in the expression and function of adhesion molecules coupled with inappropriate activation of leukocytes and endothelial cells are postulated to be the primary factors influencing the degree and location of vessel damage in the vasculitis syndromes. However, the stimuli that initiate these pathologic inflammatory changes are not well understood.
- ANCA may play a role in the pathogenesis of MPA.
- Case reports have described an association of MPA with medications such as propylthiouracil and with diseases such as primary biliary cirrhosis.[5, 6]
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