For patients with systemic damage, attention should be paid to vasculitis (1) and the possibility of systemic damage. However, when common antibodies such as ANA are negative, systemic damage is accompanied by peripheral nerve symptoms, red blood cells or/and red blood cell casts are the main renal damage, and senile systemic damage is obvious, especially in patients with blood sputum and ANCA positive, muscles, especially limbs, are sore, but the signs of weakness are not obvious. EMG.

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