International Classification of Retinopathy of Prematurity

The International Classification of Retinopathy of Prematurity (ICROP) was published in 2 parts, the first in 1984 and later expanded in 1987. It was a consensus statement of an international group of retinopathy of prematurity experts.
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Definition and Classification/Staging System for Acute Kidney Injury (AKI)

In 2004, the ADQI group and representatives from three nephrology societies established the Acute Kidney Injury Network (AKIN). Its intentions are to facilitate international, interdisciplinary and intersocietal collaborations and to ensure progress in the field of AKI, including the development of uniform standards for the definition and classification of AKI. As part of this process, the RIFLE nomenclature and classification was modified to a staging/classification system differentiating between AKI stage I, II and III. In addition, a 48-hour time window for the diagnosis of AKI was introduced to ensure that the process was acute.
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Criteria for the Classification of Wegener’s Granulomatosis (WG)

Granulomatosis with polyangiitis (GPA), formerly known as Wegener’s granulomatosis, is a rare form of vasculitis. In this disorder, small-sized blood vessels in the nose, sinuses, ears, lungs and kidneys become inflamed and damaged. Continue reading

The European Spondyloarthropathy Study Group (ESSG) Classification for Spondyloarthropathy (SpA)

According to the ESSG criteria, for a patient to be classified as having SpA, he or she has to satisfy one of two entry criteria: Inflammatory spinal pain OR synovitis that is either asymmetric or predominantly in the lower limbs.

  • Inflammatory back pain: Back pain is common among the general population. However, “inflammatory” back pain is much less common. Back pain is considered inflammatory if four of the following five criteria are found:

  1. Onset of back discomfort before the age of 40 years

  2. Insidious onset

  3. Persistence for at least three months

  4. Associated with morning stiffness

  5. Improvement with exercise

  • Asymmetrical synovitis: Asymmetrical synovitis, predominantly of the lower limbs is manifested by soft tissue swelling, warmth over a joint, joint effusion, and reductions in both active and passive range of motion. As with inflammatory spinal pain, the symptoms are worse after a period of rest.

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Revised International Classification Criteria for Sjögren's Syndrome (SS)

I. Ocular symptoms: a positive response to at least one of the following questions:

  1. Have you had daily, persistent, troublesome dry eyes for more than 3 months?

  2. Do you have a recurrent sensation of sand or gravel in the eyes?

  3. Do you use tear substitutes more than 3 times a day?

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Criteria for the Classification of Systemic Sclerosis (Scleroderma)

1980 Criteria for the Classification of Systemic Sclerosis

The American College of Rheumatology (former American Rheumatism Association – ARA) has defined criteria, that are 97 % sensitive and 98 % specific for systemic sclerosis (SSc) as follows:

Major criterion:

  • Proximal diffuse (truncal) sclerosis (skin tightness, thickening, non-pitting induration)

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