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Peripheral Arterial Disease II: Clinical Manifestations and Diagnostic Evaluation

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Clinical manifestationsPeripheral Arterial Disease (PAD) manifests through a range of symptoms, from the characteristic intermittent claudication to atypical presentations and severe complications in advanced stages. Intermittent claudication, a hallmark symptom of PAD, presents as exercise-induced muscle pain that typically resolves within minutes of rest. This pain is reproducible and stems from inadequate blood flow, leading to the accumulation of lactic acid produced during anaerobic...

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Related Experiment Video

Updated: May 10, 2026

Experimental Autoimmune Uveitis: An Intraocular Inflammatory Mouse Model

Experimental Autoimmune Uveitis: An Intraocular Inflammatory Mouse Model

Published on: January 12, 2022

Very Slowly Progressive Microscopic Polyangiitis: Comparative Analysis with Rapidly Progressive Forms.

Narumichi Iwamura¹, Kanako Tsutsumi², Yuki Ueno¹

¹Department of Nephrology, Japan Community Health Care Organization Kyushu Hospital, Kitakyushu, JPN.

|June 14, 2024

Summary

This summary is machine-generated.

Microscopic polyangiitis (MPA) can progress slowly or rapidly. Slowly progressive MPA shows less inflammation and a gradual decline in kidney function, unlike the rapidly progressive form.

Keywords:

anca-associated vasculitis (aav)chronic inflammation microscopic polyangiitis (mpa)myeloperoxidase-anti-neutrophil cytoplasmic antibodies (mpo-anca)rapidly progressive glomerulonephritis (rpgn)slowly progressive mpa

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Area of Science:

Nephrology
Rheumatology
Immunology

Background:

Microscopic polyangiitis (MPA) typically presents as rapidly progressive glomerulonephritis (RPGN) linked to myeloperoxidase anti-neutrophil cytoplasmic antibodies (MPO-ANCA).
A significant subset of ANCA-associated vasculitis (AAV) cases exhibit slower, indolent progression to renal failure, a less understood clinical course.

Observation:

This study compared two MPA patients diagnosed under the 2022 ACR/EULAR criteria, focusing on clinical and pathological differences.
Patient 1 demonstrated minimal eGFR decline (1.07%), sclerotic glomeruli, low MPO-ANCA, BVAS, and CRP, indicating slow progression.
Patient 2 showed a severe eGFR reduction (89.9%) with acute inflammation, characteristic of rapid progression.

Findings:

Slowly progressive MPA is characterized by lower disease activity, chronic inflammation, and a gradual decrease in kidney function.
Rapidly progressive MPA involves acute systemic inflammation and a swift decline in renal function.

Implications:

Distinguishing between slow and rapid MPA progression is crucial for understanding distinct pathogeneses and tailoring treatment.
Early MPO-ANCA measurement aids in diagnosing MPA, improving disease management and patient outcomes.