Capillaroscopy – Examination of Capillaries
Capillaroscopy is a painless diagnostic method used to examine the smallest blood vessels (capillaries) at the nailfold. It plays a key role in the early diagnosis of vascular and connective tissue diseases.
Things worth knowing about "Capillaroscopy"
Capillaroscopy is a painless diagnostic method used to examine the smallest blood vessels (capillaries) at the nailfold. It plays a key role in the early diagnosis of vascular and connective tissue diseases.
What is Capillaroscopy?
Capillaroscopy (also known as nailfold capillaroscopy or videocapillaroscopy) is a non-invasive imaging technique used to visualize the small blood vessels called capillaries located at the nailfold – the skin area just behind the fingernails. Using a special microscope, physicians can directly observe the structure and blood flow within these tiny vessels. The examination is painless, radiation-free, and typically takes only a few minutes.
When is Capillaroscopy Used?
Capillaroscopy is primarily used in rheumatology and angiology (vascular medicine). Common indications include:
- Evaluation of Raynaud's phenomenon (episodic color changes in fingers due to poor circulation)
- Early diagnosis of systemic sclerosis (scleroderma)
- Differentiation of connective tissue diseases and autoimmune disorders
- Monitoring disease progression in patients with known connective tissue diseases
- Assessment of microcirculatory disturbances in systemic conditions
How Does the Examination Work?
A small drop of oil is applied to the nailfold to improve skin transparency. The nailfold capillaries are then examined using a specialized capillaroscope or video microscope at magnifications of typically 100 to 200 times. The examination captures images or video footage that allow assessment of capillary shape, density, arrangement, and blood flow patterns.
Normal and Abnormal Findings
Normal Findings
In healthy individuals, capillaries appear as regular, hairpin-shaped loops with a uniform density and smooth blood flow. This pattern is referred to as normal capillary morphology.
Pathological Findings
In diseases such as systemic sclerosis, characteristic abnormalities may be observed:
- Giant (mega) capillaries: markedly enlarged capillary loops
- Capillary loss: reduced capillary density with avascular areas
- Hemorrhages: small bleedings at the nailfold
- Branching and disorganization: irregular, bushy, or ramified capillary structures
- Slow or irregular blood flow: signs of microcirculatory impairment
These findings are collectively described as the scleroderma pattern and help clinicians distinguish between primary Raynaud's phenomenon (no underlying disease) and secondary Raynaud's phenomenon associated with an autoimmune condition.
Clinical Significance and Diagnosis
Capillaroscopy is considered the gold standard for the early diagnosis of systemic sclerosis. According to the 2013 ACR/EULAR classification criteria for systemic sclerosis, nailfold capillaroscopy findings are one of the diagnostic criteria included in the scoring system. Early identification of capillary abnormalities allows physicians to initiate treatment promptly and potentially prevent or delay organ damage.
Advantages and Limitations
The method offers several advantages:
- Non-invasive and painless
- No radiation exposure
- Cost-effective and quick to perform
- Reproducible results when performed with standardized protocols
However, there are also limitations:
- Interpretation depends on the experience of the examiner
- Skin lesions or injuries in the nailfold area may impair assessment
- The method does not provide direct information about organ microcirculation
References
- Cutolo M, Sulli A, Pizzorni C, Accardo S. Nailfold videocapillaroscopy assessment of microvascular damage in systemic sclerosis. Journal of Rheumatology, 2000;27(1):155-160. Available on PubMed.
- van den Hoogen F et al. 2013 Classification Criteria for Systemic Sclerosis. Arthritis & Rheumatism, 2013;65(11):2737-2747. DOI: 10.1002/art.38098.
- Smith V, Herrick AL, Ingegnoli F et al. Standardisation of nailfold capillaroscopy for the assessment of patients with Raynaud's phenomenon and systemic sclerosis. Autoimmunity Reviews, 2020;19(3):102458. DOI: 10.1016/j.autrev.2020.102458.
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