Predictive value of nailfold capillaroscopy in the diagnosis of connective tissue diseases

Utility of nailfold capillary assessment for predicting pustulotic arthro-osteitis in palmoplantar pustulosis based on a prospective cohort study

BACKGROUND

Pustulotic arthro-osteitis (PAO) is 1 of the most serious comorbidities associated with palmoplantar pustulosis (PPP). Risk factors of PAO development are not well-known.

OBJECTIVE

To evaluate the clinical significance of nailfold capillary (NFC) changes in patients with PPP.

METHODS

We conducted a prospective cohort study in a population of 102 PPP patients. Correlations of NFC abnormalities, including nailfold bleeding and enlarged capillaries, with the prevalence of PAO, the incidence of new PAO, and serum levels of cytokines were analyzed.

RESULTS

Detailed examination revealed that of 102 PPP patients, 52 without PAO and 50 with PAO. Both nailfold bleeding and enlarged capillaries were significantly more frequent in patients with PAO (50.0% vs 92.0%, P < .0001; 50.0% vs 94.0%, P < .0001). In addition, PPP patients without PAO were prospectively observed before they developed PAO (mean 28 months [1-52 months]). Multivariate analysis suggested that these NFC abnormalities were predictors of PAO development (hazard ratio 3.37, 95% confidence interval 1.13-10.07; 3.37, 1.13-10.07) and guselkumab prevent PAO development (0.093, 0.012-0.76). The degree of NFC abnormalities correlated with the severity of PAO and serum cytokine levels.

LIMITATIONS

All participants were Japanese.

CONCLUSION

NFC abnormalities could be predictors of PAO in PPP patients, and their degree indicators of disease severity.

Assessment of nail fold capillary changes by hand-held dermoscopy in adult dermatomyositis: A single-centre prospective study

BACKGROUND

Hand-held dermoscopy is a valuable tool for dermatologists, but it has been rarely used to assess the nail fold capillary (NFC) in patients with dermatomyositis (DM).

METHODS

Patients were collected from the Department of Dermatology and Venereology from July 2020 to July 2021, and the follow-up was conducted until January 2022. Demographic features, disease activity and NFC changes were analysed using a hand-held dermoscopy.

RESULTS

The most common NFC finding in our study was bushy capillary (87.0%). There was no significant improvement in scleroderma-dermatomyositis (SD)-like nail fold changes or enlarged capillaries from baseline to 12 weeks of treatment (p > 0.05) or from 12 weeks to 24 weeks of treatment (p > 0.05), but there was a significant improvement from baseline to 24 weeks of treatment (p < 0.05). The avascular area did not improve from baseline to 12 weeks of follow-up, but the changes were significant from 12 weeks to 24 weeks of treatment (p < 0.05) and baseline to 24 weeks of treatment (p < 0.05). Periungual erythema improved significantly from baseline to 12 weeks of treatment (p < 0.05) and baseline to 24 weeks of treatment (p < 0.05), but it did not improve significantly from 12 weeks to 24 weeks of treatment (p > 0.05). There was no significant difference in disease activity between patients with or without specific NFC changes. However, some NFC features improved as disease activity decreased.

CONCLUSION

Dermoscopy of NFC is a cost-effective option for the preliminary diagnosis of DM. Further, long-term follow-up is necessary to study the relationship between disease activity and NFC changes.

Utility of nailfold capillary assessment for predicting psoriatic arthritis based on a prospective observational cohort study

OBJECTIVES

PsA is one of the most serious comorbidities associated with psoriasis. While the early intervention in PsA is demanded, risk factors of PsA development are not well-known. This is the first prospective study to evaluate the clinical significance of nailfold capillary (NFC) changes in patients with psoriasis.

METHODS

We conducted a prospective cohort study in a population of 449 psoriasis patients who had not been treated with systemic therapy or topical finger therapy. NFCs were observed by dermoscopy and capillaroscopy, and the correlation of NFC abnormalities, including nailfold bleeding (NFB) and enlarged capillaries, with the prevalence of PsA, incidence of new PsA, and serum levels of TNF-a, IL-17A and IL-23 were analysed.

RESULTS

Detailed examination at the time of inclusion revealed that of 449 patients, 236 had Psoriasis vulgaris (PsV) and 213 had PsA. Both NFB and enlarged capillaries were significantly more frequent in patients with PsA (34.7% vs 84.5%, P < 0.0001; 25.4% vs 100%, P < 0.0001). In addition, PsV patients were prospectively observed before they developed PsA (mean 21 months, 95% CI 2, 77 months). Multivariate analysis suggested that the appearance of NFB and enlarged capillaries was a predictor of PsA development (HR 2.75, 95% CI 1.38, 5.47 and HR 4.49, 95% CI 2.25, 8.96, respectively). The degree of NFC abnormalities also correlated with the severity of PsA and serum cytokine levels.

CONCLUSIONS

NFC abnormalities were suggested to be a predictor of PsA in psoriasis patients, and at the same time, its degree could be an indicator of disease severity.

Nailfold capillaroscopy as a prognostic marker for connective tissue diseases: An observational clinico-epidemiological study

Background Nailfold capillaroscopy (NFC) is useful in the diagnosis and assessment of various connective tissue diseases. In this study, NFC findings were studied in patients of systemic sclerosis (SS), systemic lupus erythematosus (SLE) and dermatomyositis. Aims To study the nailfold capillaroscopic findings in patients with connective tissue disorders, their correlation with disease severity, and changes in findings following treatment or disease progression. Methods This observational prospective time-bound clinico-epidemiological study was conducted in 43 patients over 20 months at Topiwala National Medical College and BYL Nair Ch. Hospital, Mumbai. NFC was performed using the polarising mode of a USB 2.0 video-dermatoscope in all 10 fingernails at 50X and 200X. It was repeated at three follow-up visits to look for changes in findings. Results Among SLE patients, eleven (52.4%) had non-specific NFC patterns and eight (38.1%) had SLE patterns. Among systemic sclerosis patients, eight (42.1%) cases had active and late SS patterns respectively, while one (5.3%) each had SLE, non-specific and early SS patterns. After three follow-ups, 10 out of 11 (90.9%) cases with improvement in NFC also showed clinical improvement; this figure was significantly more than 11 out of 23 (47.8%) cases who had no change in NFC but showed clinical improvement. Two of the three dermatomyositis patients showed a non-specific pattern while one showed a late SS pattern at baseline. Limitations A larger sample size would have yielded results with more validity. Standardisation of the interval between baseline and last follow-up to equal to or more than six months would have yielded results with more accuracy. Conclusion Capillary findings change significantly over time and reflect changes in the clinical status of patients of both SLE and systemic sclerosis, and hence are an important prognostic marker. Rather than an overt change in NFC pattern, reduction or increase in abnormal capillaries is a better predictor of change in disease activity.

Nailfold capillaroscopy for the early diagnosis of the scleroderma spectrum of diseases in patients without Raynaud's phenomenon

BACKGROUND

The utility of nailfold capillaroscopy in the evaluation of patients without Raynaud's phenomenon is unclear.

OBJECTIVE

This study aims to compare the utility of nailfold capillaroscopy for the early diagnosis of the scleroderma-spectrum of diseases in patients who present with Raynaud's phenomenon, undifferentiated non-Raynaud's phenomenon features and positive systemic sclerosis-associated antibodies without scleroderma-spectrum of disease features.

METHODS

Eligible patients were divided into three referral criteria groups: (I) Raynaud's phenomenon; (II) Undifferentiated non-Raynaud's phenomenon features and (III) Positive systemic sclerosis-associated autoantibodies without features to suggest scleroderma-spectrum of diseases. This includes systemic sclerosis, mixed connective tissue disease and dermatomyositis. The association between baseline scleroderma pattern on nailfold capillaroscopy (systemic sclerosis-nailfold capillaroscopy) and final diagnosis at follow-up was determined using logistic regression analysis. Test characteristics of nailfold capillaroscopy were compared and stratified by referral groups.

RESULTS

Of 95 patients followed-up for a mean of 1.6 years, 28 (29.5%) patients developed scleroderma-spectrum of diseases, 36 (37.9%) patients had suspected/other connective tissue disease and 27 (28.4%) patients had no connective tissue disease. Baseline systemic sclerosis-nailfold capillaroscopy was significantly associated with the development of scleroderma-spectrum of diseases in patients from Group I (odds ratio, 7.1, p = 0.01) and Group II (odds ratio 7.3, p = 0.005). In Group II patients, nailfold capillaroscopy had a sensitivity, specificity, positive and negative predictive values of 71.4%, 76.5%, 55.6% and 86.7%, respectively. Specificity (81.8%) and PPV (69.2%) were the highest in Group I patients. Nailfold capillaroscopy had the highest negative predictive value in Group III (100%), followed by Group II (86.7%) and Group I (78.3%) patients.

CONCLUSION

In addition to evaluating patients with Raynaud's phenomenon, nailfold capillaroscopy was useful in the evaluation and exclusion of scleroderma-spectrum of diseases in patients with undifferentiated non-Raynaud phenomenon features and those with systemic sclerosis-associated antibodies without features to suggest scleroderma-spectrum of diseases.

Nail-fold capillaroscopy for the dermatologists

Nail fold is one of the most accessible sites for studying changes in the microcirculation in various microangiopathies. The characterization of changes in microvasculature can provide useful clues towards the diagnosis and prognosis of a disease. The diagnostic utility of nail fold capillaroscopy has improved and expanded over the past couple of decades. Beyond connective tissue diseases, it is now explored for its role in various systemic and dermatological diseases. Incorporation of nail-fold capillaroscopy in the diagnostic criteria of systemic sclerosis has generated interest among dermatologists. The current review is aimed at providing knowledge about nail-fold capillaroscopy to dermatologists. For the purpose of review, a PubMed search was done using the keywords "nail fold capillaries" and "nail fold capillaroscopy". All the articles were retrieved and classified into reviews and clinical studies of various types. The final data were then analyzed and presented in a narrative fashion.

Capillaroscopy as a diagnostic tool in the diagnosis of mixed connective tissue disease (MCTD): a case report

BACKGROUND

The concept of mixed connective tissue disease (MCTD) as a unique connective tissue disease has endured for half a century. Disease onset can be in adulthood (MCTD) or of juvenile onset (jMCTD) and is characterized by overlapping features of systemic lupus erythematosus (SLE), polymyositis or dermatomyositis (PM/DM) and systemic sclerosis (SSc). No universally accepted classification criteria for MCTD exists, however agreed upon overlapping disease features include the presence of high titers of U1 small nuclear ribonucleoprotein particle antibodies (U1snRNP) in the peripheral blood, Raynaud's phenomenon, synovitis, myositis and swollen hands or fingers. Characteristic capillaroscopy findings are commonly seen in MCTD and jMCTD, which may represent a crucial and key clue for classification as well as prognosis in these patients.

CASE PRESENTATION

We present a young male patient, with symptom onset as early as age 13, who was diagnosed with MCTD at age 16 and found to have high titers of anti-U1snRNP antibodies, Raynaud's phenomenon, synovitis, and swollen hands and fingers. Most interestingly, his video capillaroscopy at diagnosis was abnormal and revealed an active SSc-like pattern. His presentation and course are described.

CONCLUSIONS

We conclude that based on existing data, and as highlighted by this case presentation, nailfold video capillaroscopy should be included as an early screening tool for the detection of microangiopathy in patients with the diagnosis MCTD and jMCTD. Additionally, given its prevalence in this population at disease diagnosis, we recommend consideration be given to nailfold video capillaroscopy as a potentially important classification criteria and prognostic tool for jMCTD and MCTD.

Retinal microcirculation abnormalities in patients with systemic sclerosis: an explorative optical coherence tomography angiography study

OBJECTIVES

To investigate subclinical or clinical abnormalities in retinal and choroidal vascular plexuses in patients with systemic sclerosis (SSc) by means of optical coherence tomography angiography (OCT-A).

METHODS

A total of 20 consecutive SSc patients were recruited and compared to 20 healthy subjects. Quantitative analysis of vessel density (VD), choriocapillaris plexus flow index (CCP-FI) and choroidal vascularity index were performed on OCT-A images in the superficial capillary plexus (SCP), deep capillary plexus (DCP) and choriocapillaris for all patients. Images were further reviewed by two independent readers for the assessment of qualitative abnormalities, including tortuosity, rarefaction areas, megacapillaries and macular-foveal capillaries (MFC).

RESULTS

The DCP-VD in the whole scan and in parafoveal, superior, inferior, nasal and temporal regions was significantly lower in the SSc group. The CC-FI was significantly higher in SSc patients. When comparing SSc patients with and without digital ulcers (DUs), significantly reduced SCP-VD was demonstrated in the whole, parafoveal, superior, inferior, temporal and nasal regions. No difference in any of the OCT-A parameters was observed when comparing patients with or without interstitial lung disease (ILD). Qualitative analysis of OCT-A revealed at least one abnormality in 95% of patients.

CONCLUSIONS

We showed the ability of OCT-A to disclose early ocular vascular abnormalities in patients with SSc. Our results may represent a hypothesis-generating basis for exploring the potential role of OCT-A in diagnosis, monitoring and prognosis stratification in SSc.

Reduction of the nailfold capillary blood velocity in cigarette smokers

Background

Cigarette smoking causes cardiovascular disease and activates markers of endothelial dysfunction or injury. We investigated the nailfold capillary blood velocity (NCV) in cigarette smokers compared to non-smokers.

Methods

Forty-eight men (eighteen non-smokers and thirty smokers) were recruited. We measured NCV using nailfold capillary microscopy and exhaled carbon monoxide (ECO) concentration three times (before smoking; NCV_0min and ECO_0min, and after smoking; NCV_5min, ECO_5min, NCV_30min, and ECO_30min), in a condition of fasting in the case of smokers. In non-smokers, the same measurements were taken without smoking. Additionally, personal cigarette smoking and alcohol drinking history were acquired by a self-administrated questionnaire.

Results

Mean age, waist circumference, ECO_0min, ECO_5min, and ECO_30min was higher and NCV_5min and NCV_30min were significantly lower in smokers compared to non-smokers. Total smoking years were negatively correlated with NCV_5min. Average pack of the daily smoking, total pack-years, as well as total smoking years were also negatively correlated with NCV_30min by regression analysis. After adjustment of significantly different variables, NCV_30min was significantly lower in smokers. In the subgroup analysis, the interleukin-6 level was significantly increased in subjects with a long period of cigarette smoking compared with non-smokers.

Conclusion

Reduction of NCV in smokers is associated with personal smoking history, not with body composition or certain oxidative stress markers.

The capillaroscopic findings in idiopathic pernio: is it a microvascular disease?

OBJECTIVES

Pernio is a disorder that affects the unprotected skin regions of individuals who are exposed to nonfreezing, damp cold. We aimed to examine nailfold capillaries by video capillaroscopy and evaluate the vascular involvement in patients with idiopathic pernio.

METHODS

Fifty-three patients with idiopathic pernio (male/female ratio 35:18, mean age 25 ± 9 years) and 38 age- and sex-matched healthy volunteers (male/female ratio 30:8, mean age 24 ± 4 years) were included in the study. Forty-seven of the 53 patients and all the healthy volunteers were evaluated by nailfold video capillaroscopy.

RESULTS

In the patient group, the mean capillary diameter and the mean apical capillary diameter were 56 ± 15 and 24 ± 7 μm, respectively. In the control group, the mean capillary diameter and the mean apical capillary diameter were 37 ± 8 and 15 ± 4 μm, respectively (both p < 0.001). Both of these differences were independent of the disease activity, smoking, and the number of pernio episodes. There were no architectural derangements, avascular areas, or hemorrhages.

CONCLUSIONS

In the present study, increased nailfold capillary diameter and increased apical capillary diameter were found in patients with pernio regardless of the disease activity. These findings suggest organic damage of the microcirculation.

Clinical applicability of quantitative nailfold capillaroscopy in differential diagnosis of connective tissue diseases with Raynaud's phenomenon

BACKGROUND/PURPOSE

Nailfold capillaroscopy is a useful tool to distinguish primary from secondary Raynaud's phenomenon (RP) by examining the morphology of nailfold capillaries but its role in disease diagnosis is not clearly established. The purpose of this study was to evaluate the roles of quantitative nailfold capillaroscopy in differential diagnosis of connective tissue diseases (CTDs) with RP.

METHODS

The data between the year 2005 and 2009 were retrieved from the nailfold capillaroscopic database of National Taiwan University Hospital (NTUH). Only the data from the patients with RP were analyzed. The criteria for interpretation of capillaroscopic findings were predefined. The final diagnoses of the patients were based on the American College of Rheumatology classification criteria for individual diseases, independent of nailfold capillaroscopic findings. The sensitivity and the specificity of each capillaroscopic pattern to the diseases were determined.

RESULTS

The data from a total of 67 patients were qualified for the current study. We found the sensitivity and specificity of scleroderma pattern for systemic sclerosis (SSc) were 89.47% and 80%, and the specificity of the early, active, and late scleroderma patterns for SSc reached 87.5%, 97.5%, and 95%, respectively. The sensitivity/specificity of systemic lupus erythematosus (SLE) pattern for SLE and polymyositis/dermatomyositis (PM/DM) pattern for PM/DM were 33.33%/95.45% and 60%/96.3%, respectively. The sensitivity/specificity of mixed connective tissue disease (MCTD) pattern for MCTD were 20%/100%.

CONCLUSION

The nailfold capillaroscopic (NC) patterns may be useful in the differential diagnosis of CTDs with RP. The NC patterns for SSc and PM/DM are both sensitive and specific to the diseases, while the SLE and MCTD patterns exhibit high specificity but relatively low sensitivity.

Acrocyanosis: the Flying Dutchman

Acrocyanosis is symmetric, painless, discoloration of different shades of blue in the distal parts of the body that is marked by symmetry, relative persistence of the skin color changes with aggravation by cold exposure, and frequent association with local hyperhidrosis of hands and feet. Described over a century ago and despite seeming familiarity, it remains a poorly understood condition that shares much in clinical presentation with other conditions characterized by skin color changes in the distal parts of the body. The diagnosis remains mostly clinical, and pathological mechanisms vary suggesting that acrocyanosis may not be a single entity. We performed an extensive literature review to summarize existing knowledge about the demographics, pathology, diagnosis, and treatment of this condition.

Association between nail-fold capillary findings and disease activity in dermatomyositis

OBJECTIVE

Although findings of nail-fold capillary changes and reduced red blood cell velocity in SSc patients are well established, studies in adult-onset DM patients are scarce. Our objective was to assess the changes and red blood cell velocity in finger nail-fold capillaries using nail-fold video capillaroscopy (NVC) in patients with adult-onset DM.

METHODS

This study included 50 patients with adult-onset DM and 20 healthy subjects. A semi-quantitative rating scale was used to score capillaroscopy changes. Red blood cell velocity was evaluated using frame-to-frame determination of the position of capillary plasma gaps.

RESULTS

Thirty-seven (74%) patients showed the scleroderma NVC pattern. Patients with the scleroderma pattern exhibited elevated serum creatine kinase levels more frequently and increased visual analogue scale of muscle disease activity. Scores of loss of capillaries were associated with muscle and global disease activity, whereas scores of haemorrhages were associated with skin disease activity. However, NVC findings were not significantly associated with lung involvement. The scores of irregularly enlarged capillaries, haemorrhages and loss of capillaries were reduced after stabilization of disease activity by treatment. The mean red blood cell velocity was not significantly reduced in DM patients compared with healthy controls and was not changed by treatment.

CONCLUSION

Our results suggest that changes in nail-fold capillaries reflect disease activity in DM. Furthermore, the differences found in red blood cell velocity may reflect somewhat distinct microcirculation injuries in DM and SSc.

Quantitative nailfold video capillaroscopy in patients with idiopathic inflammatory myopathy

OBJECTIVES

To quantify nailfold capillary density and dimensions in patients with idiopathic inflammatory myopathy (IIM) and compare them with those in healthy controls; to look for associations with microvascular disease in IIM; and to determine whether nailfold capillary density and dimensions change over time.

METHODS

Nailfold video microscopy (x300 magnification) was performed on 24 patients with IIM and 35 healthy controls. Capillary density and dimensions (total width and apical width) were quantified. Patients were clinically assessed and disease activity recorded using the Myositis Disease Activity Assessment Tool. Disease severity and physical function were assessed using the myositis damage index and Stanford HAQ, respectively. Findings were analysed using linear and logistic regression, adjusted for age and sex. In a subgroup of 16 patients with IIM and 27 controls, the process was repeated 6-12 months later and the results were analysed using Student's t-test.

RESULTS

Capillary density was lower and dimensions were higher in patients with IIM compared with healthy controls (P < 0.001 for all). Anti-Jo-1 antibody was associated with reduced capillary density. In the longitudinal cohort, the mean change in capillary density was -1.4 in patients vs -0.4 in controls (P = 0.07). Mean change in capillary dimensions did not differ between patients and controls, but some patients demonstrated pronounced changes in capillary morphology over time.

CONCLUSIONS

Reduced capillary density and increased dimensions in patients with IIM can be quantified using nailfold capillaroscopy, suggesting that nailfold capillaroscopy may be useful as an outcome measure of microvascular disease in studies of IIM.

Reduced red blood cell velocity in nail-fold capillaries as a sensitive and specific indicator of microcirculation injury in systemic sclerosis

OBJECTIVE

To assess red blood cell velocity in finger nail-fold capillaries using video capillaroscopy in patients with SSc and other collagen diseases.

METHODS

This study included 127 patients with SSc as well as patients with SLE (n = 33), DM/PM (n = 21), RA (n = 13) and APS (n = 12), and 20 healthy subjects. Red blood cell velocity was evaluated using frame-to-frame determination of the position of capillary plasma gaps.

RESULTS

The mean red blood cell velocity was significantly decreased in patients with SSc compared to healthy controls (63.0% reduction) and patients with other conditions. Mean blood velocity was similar between patients with dcSSc and lcSSc. Importantly, even SSc patients with normal or non-specific nail-fold video capillaroscopic (NVC) patterns or a scleroderma early NVC pattern exhibited a significantly lower red blood cell velocity compared to healthy controls (51.7 and 61.4% reduction, respectively) or patients with other conditions, despite normal or mild capillary changes. Patients with the scleroderma active and late NVC pattern showed a more decreased blood velocity (65.5 and 66.2% reduction, respectively). This reduced blood velocity was significantly associated with NVC findings, including capillary ramification and capillary loss. Although remarkably reduced velocity was observed in SSc patients with intractable digital ulcers (72.1% reduction), it was significantly improved by lipo-prostaglandin E(1) (lipo-PGE(1)) infusion.

CONCLUSION

Our results suggest that reduced blood velocity is a hallmark of SSc. Furthermore, measurement of red blood cell velocity may be useful in evaluating therapeutic effects on microcirculation.

The role of capillaroscopy in differentiation of primary and secondary Raynaud's phenomenon in rheumatic diseases: a review of the literature and two case reports

The purpose of this study is to study and systematize the current knowledge about the role of capillaroscopy in differentiation of primary and secondary Raynaud's phenomenon (RP) in rheumatic diseases. This method is a review of the literature. Capillaroscopy is of crucial value for diagnosis and differentiation of primary and secondary RP in rheumatic diseases. The appearance of abnormal capillaroscopic pattern inherits high positive predictive value for the development of systemic rheumatic disease. The most specific pattern is found in systemic sclerosis (SSc), so called "scleroderma pattern", which is characterized by the presence of dilated capillaries, hemorrhages, avascular areas and neoangiogeneis. It is found in more than 90% of patients with overt SSc. Similar changes are found in patients with dermatomyositis, mixed connective tissue disease, undifferentiated connective tissue disease and they are called "scleroderma-like pattern". Absence of abnormal capillaroscopic findings can be regarded as a diagnostic criterion for primary RP. Inclusion of pathologic capillaroscopic pattern may increase the sensitivity of ACR classification criteria for SSc. In conclusion, capillaroscopy is of crucial importance for the differentiation of primary and secondary RP in rheumatic diseases, and also in differentiation between different forms of connective tissue diseases as well as for their early diagnosis.

Raynaud’s Phenomenon and Plasma Endothelin: Correlations with Capillaroscopic Patterns in Systemic Sclerosis

Objective.

We evaluated endothelin (ET)-1 plasma levels and some clinical measures in patients with primary Raynaud’s phenomenon (PRP), and in patients with systemic sclerosis (SSc) and secondary RP (SRP), in the latter according to their different nailfold videocapillaroscopy (NVC) patterns of microangiopathy (early, active, and late).

Methods.

Ninety-nine patients with SSc, 49 with PRP, and 45 control subjects were studied. NVC was performed in all patients to distinguish the pattern of microvascular damage, and the morphological alterations were scored by a semiquantitative rating scale. ET-1 plasma levels were evaluated in all individuals by ELISA.

Results.

ET-1 plasma levels were significantly higher (p = 0.001) in patients with both PRP and SRP, compared to controls. A significant positive correlation (p = 0.03) was found between ET-1 plasma levels and SRP duration, but not between ET-1 plasma levels and PRP duration. Significant correlations were observed in patients with SSc between ET-1 plasma levels and clinical measures (e.g., digital ulcers), as well as the score value of single NVC measures, such as the number of capillaries, “ramified” capillaries, and enlarged capillaries (p < 0.05). Finally, the highest ET-1 plasma levels were found in patients with SSc showing the late pattern of microangiopathy when compared to the early pattern (p = 0.03) and to controls (p = 0.003).

Conclusion.

Highest ET-1 plasma levels were detected in the more advanced stage of the SSc microangiopathy, namely the late NVC pattern, characterized by capillary loss and increased tissue fibrosis; this might support the involvement of ET-1 in the progression of the microvascular/fibrotic SSc damage.

Scleroderma Lung

The lungs are frequently involved in systemic sclerosis ('scleroderma'), a rare, disabling disease of unknown origin, characterised by skin thickening and Raynaud's phenomenon. The pathogenesis of scleroderma is complex, but signs and symptoms of excessive fibrosis, vasculopathy and inflammation are almost universally present. Dyspnoea in scleroderma patients can be due to chest wall tightening from skin thickening, pleural disease, cardiac involvement, myositis of intercostal muscles, or so-called scleroderma lung disease. Scleroderma lung disease encompasses vascular (pulmonary artery hypertension) or interstitial lung disease, or both. A comprehensive work-up is required to delineate the underlying cause of dyspnoea in a scleroderma patient, and to establish the contribution of each component to the symptoms. This should include a 6-minute walk test, pulmonary function testing, high-resolution thoracic CT scanning, ECG, echocardiography and, if pulmonary artery hypertension is suspected, right-heart catheterisation; bronchoalveolar lavage is optional. Lung disease in scleroderma contributes significantly to excess morbidity and early mortality, especially when diffusion capacity drops below 40% and/or forced vital capacity below 50%. However, recent clinical studies have unequivocally demonstrated that scleroderma lung disease is amenable to treatment with new vasodilatory drugs that target specific pathways involved in vasoconstriction, or with cyclophosphamide for interstitial lung disease. Uncontrolled studies have suggested that these therapies also have an impact on survival, but controlled studies with a long follow-up are needed to corroborate this point.

Nailfold capillaroscopy is useful for the diagnosis and follow-up of autoimmune rheumatic diseases. A future tool for the analysis of microvascular heart involvement?

Raynaud's phenomenon (RP) represents the most frequent clinical aspect of cardio/microvascular involvement and is a key feature of several autoimmune rheumatic diseases. Moreover, RP is associated in a statistically significant manner with many coronary diseases. In normal conditions or in primary RP (excluding during the cold-exposure test), the normal nailfold capillaroscopic pattern shows a regular disposition of the capillary loops along with the nailbed. On the contrary, in subjects suffering from secondary RP, one or more alterations of the capillaroscopic findings should alert the physician of the possibility of a connective tissue disease not yet detected. Nailfold capillaroscopy (NV) represents the best method to analyse microvascular abnormalities in autoimmune rheumatic diseases. Architectural disorganization, giant capillaries, haemorrhages, loss of capillaries, angiogenesis and avascular areas characterize >95% of patients with overt scleroderma (SSc). The term 'SSc pattern' includes, all together, these sequential capillaroscopic changes typical to the microvascular involvement in SSc. The capillaroscopic aspects observed in dermatomyositis and in the undifferentiated connective tissue disease are generally reported as 'SSc-like pattern'. Effectively, and early in the disease, the peripheral microangiopathy may be well recognized and studied by nailfold capillaroscopy, or better with nailfold video capillaroscopy (NVC). The early differential diagnosis between primary and secondary RP is the best advantage NVC may offer. In addition, interesting capillaroscopic changes have been observed in systemic lupus erythematosus, anti-phospholipid syndrome and Sjogren's syndrome. Further epidemiological and clinical studies are needed to better standardize the NCV patterns. In future, the evaluation of nailfold capillaroscopy in autoimmune rheumatic diseases might represent a tool for the prediction of microvascular heart involvement by considering the systemic microvascular derangement at the capillary nailfold.

Kapillarmikroskopie und rheumatische Erkrankungen: State of the art

Nailfold capillaroscopy (NVC) represents the best method for analyzing microvascular abnormalities in rheumatic diseases. Raynaud's phenomenon (RP) represents the most frequent clinical aspect of microvascular involvement and is a key feature of several such diseases. Under normal conditions or in primary RP (exclusion by the cold-exposure test), the normal nailfold capillaroscopic pattern shows a regular disposition of the capillary loops within the nail bed. However, in subjects suffering from secondary RP, one or more alterations in the capillaroscopic findings should alert the physician to search for an underlying connective tissue disease. Architectural disorganization, giant capillaries, hemorrhages, loss of capillaries and avascular areas characterize more than 95% of patients with overt systemic sclerosis (scleroderma, SSc). Therefore, the term "scleroderma pattern", includes all capillaroscopic changes typical of the microvascular involvement in SSc. The capillaroscopic aspects observed in dermatomyositis and in undifferentiated connective tissue disease are generally reported as "scleroderma-like patterns". This peripheral microangiopathy can be effectively detected early in the course of the disease and studied in detail by nailfold capillaroscopy or, better, with NVC. In addition, early differential diagnosis between primary and secondary RP is the greatest advantage NVC has to offer. In addition, interesting capillaroscopic changes have been observed in systemic lupus erythematosus, antiphospholipid syndrome and Sjögren's syndrome. However, further epidemiological and clinical studies are needed to better standardize NVC patterns.

Raynaud’s Syndrome: comparison of late and early onset forms using hand perfusion scintigraphy

Primary Raynaud's disease is generally a disease of younger females; however, there are cases where symptoms present over the age of 40. These cases are described as late onset. In our current prospective study we compared the characteristics of early and late onset types of primary Raynaud's in 127 patients. In addition to the collection of medical records, we performed capillary-microscopy and hand perfusion scintigraphy using Tc-99 m DTPA to evaluate the microcirculation of each patient's fingers. Regarding the spectrum of the capillary-microscopic findings, we did not find any significant difference between the early and late onset forms. However, in hand perfusion examinations done using Tc-99 m DTPA, we measured a significantly lower finger/palm ratio (FPR) in the early onset group of patients. We also observed a correlation between the duration of the disease and the FPR, as well as between the age and FPR. Longer disease duration resulted in a significantly lower FPR. On the basis of our results, we believe that late onset Raynaud's should be treated as a separate entity. Due to its different characteristics found on examination and follow-up of our patients, functional hand perfusion examination should be recommended independently of the age-related characteristics of the disease.

Evaluation of Nailfold Videocapillaroscopic Abnormalities in Patients With Systemic Lupus Erythematosus

OBJECTIVE

Nailfold capillaroscopy (NFC) has been shown to have a remarkable value in the differential diagnosis of connective tissue diseases. In fact, NFC patterns reflect the microvascular changes that may play a significant role in pathogenesis. The aims of this study were to determine in patients with systemic lupus erythematosus (SLE) the prevalence of NFC patterns, to evaluate any association with clinical features and laboratory parameters.

MATERIALS AND METHODS

One hundred twenty-three patients with SLE were included in this retrospective study. Video NFC parameters were analyzed in each patient. In all cases, the following parameters were evaluated: capillary arrangement, density, size, and shape.

RESULTS

In patients with SLE, major capillary abnormalities were frequently observed (44 of 123 = 35.8%); however, no specific pattern was noted. There was a significant correlation between the SLEDAI index and the severity of capillary abnormalities (P < 0.0001). Pathologic capillary abnormalities were also significantly increased in SLE with positive anti-U1-RNP antibodies (P < 0.05).

CONCLUSION

NFC may be a useful method to evaluate the microvascular changes in patients with SLE, and the presence of major capillary abnormalities seems to herald a more severe clinical course of the illness.

Capillaroscopy

Raynaud's phenomenon (RP) is the most common and significant clinical condition with an indication for a microvascular analysis to be carried out as soon as possible. Microvascular involvement is a key feature of RP and several rheumatic diseases are characterised by the presence of RP. Nailfold capillary microscopy shows an impressive cost/effectiveness ratio: it is simple, non-invasive and inexpensive. Well recognised nailfold videocapillaroscopic patterns (NVC) have been described mainly in systemic sclerosis (SSc) patients with secondary RP. The peripheral microvascular damage in SSc is characterised by increasing structural alterations of the capillaries (giant capillaries and microhaemorrhagies) with a progressive decrease in their density. The detection of the scleroderma NVC pattern allows an early distinction between the primary RP (functional, not disease associated) and the secondary RP (disease associated). Other major NVC patterns have been described in the field of rheumatic diseases. Interestingly, correlations are evident between the NVC and the clinical symptoms, severity of the disease and the laboratory findings.

Nailfold video-capillaroscopy in systemic sclerosis

The Raynaud's phenomenon (RP) is the most common and significant clinical condition supporting microvascular analysis as soon as possible. Microvascular involvement is a key feature of RP, and several rheumatic diseases are characterized by the presence of the RP. Nailfold capillary microscopy shows an impressive cost/effectiveness ratio: it is simple, noninvasive and inexpensive.Well-recognized videocapillaroscopic patterns (NVC) have been described mainly in scleroderma (SSc) patients complaining of a secondary RP. The peripheral microvascular damage in SSc is characterized by increasing structural alterations of the capillaries (giant capillaries and microhemorrhages) with progressive decrease of their density. The detection of the scleroderma NCV allows early differentiation between primary RP (functional, not disease associated), and secondary RP (disease associated). Other major NVC patterns have been described in the field of rheumatic diseases. Interestingly, correlations are evident between the NCV and the clinical symptoms, severity of the disease and the laboratory findings. Further clinical and epidemiological studies, as well as a standardized and computerized quantitation of the observed damages are required.

Nail fold videocapillaroscopy in mixed cryoglobulinaemia

BACKGROUND

Nail fold videocapillaroscopy (NVC) has been extensively used to examine morphological and functional changes of microcirculation in connective tissue diseases. The nutritional circulation that depends on tissue capillaries, can be expected to be significantly impacted in mixed cryoglobulinaemia (MC).

METHODS

Using NVC, we evaluated 29 patients with MC (19 women), mean age 66 years (range 40-83). They included 28 hepatitis C virus (HCV) positive patients-14 genotype 1b, 10 genotype 2a 2c, two genotype 4, two with undetermined genotype. Of them, 18 had type II (IgMk-IgG) MC and 11 had type III. All patients were symptomatic, presenting with weakness (24 of 29 patients), arthralgia (24), purpura (16), peripheral neuropathy (20), Raynaud's phenomenon (8), hypertension (19) and membranoproliferative glomerulonephritis (MPGN) (9). The nail fold capillaries of four fingers per hand were examined using a videomicroscope.

RESULTS

Of the 29 patients, 27 had morphological abnormalities (including tortuosity and apical enlargement), 18 had capillaries with deeply altered orientations, 17 had shortened capillaries and 20 neoangiogenetic phenomena. These four types of capillary abnormalities were simultaneously present in 10, suggesting this combination to be a characteristic pattern in MC. Less common alterations included haemorrhages (10 cases), enlarged and giant capillaries (2) and avascular areas (2). The patients with MC-associated MPGN had a significantly greater number of capillary abnormalities (mean 4.5, range 4-6) than non-nephritic patients (mean 3.5, range 1-6, P = 0.01). The number of capillary abnormalities was not related to the presence of Raynaud's phenomenon. Microcirculatory changes did not correlate with other clinical manifestations or serological indices, including cryocrit, cryoglobulin type, HCV genotype, viral load, haemoglobin, ALT, rheumatoid factor, IgM and C4 levels.

CONCLUSIONS

Patients with MC show a variety of microcirculatory changes, often clustered in a characteristic pattern of abnormally oriented, short capillaries and neoangiogenetic phenomena. Capillary changes are more numerous in nephritic patients.

Nailfold digital capillaroscopy in 447 patients with connective tissue disease and Raynaud's disease

The presence of megacapillaries and a decreased capillary density are the hallmarks of the scleroderma capillary pattern, which can be detected by nailfold capillarmicroscopy. One hundred and eighty-six patients with Raynaud's phenomenon, 65 cases with undifferentiated connective tissue disease (UCTD), 47 patients with systemic lupus erythematosus (SLE), 26 patients with dermato/polymyositis, 14 with rheumatoid arthritis, seven cases with primary Sjögren's syndrome and 102 patients with systemic sclerosis (SSc) were investigated. Of the 16 patients with diffuse cutaneous SSc and the 86 limited cutaneous SSc cases, 14 (87.5%) and 53 (61.6%) showed the scleroderma capillary pattern, respectively. Nine of the 65 (13.8%) cases with UCTD and 24 of the 186 (12.9%) cases with Raynaud's phenomenon also exhibited the same pattern. Four of the 47 (8.5%) with SLE and seven of the 26 (26.9%) with dermato/polymyositis, and no patients with rheumatoid arthritis or Sjögren's syndrome, exhibited the scleroderma capillary pattern. The conclusion is that the scleroderma capillary pattern is often present in SSc and dermato/polymyositis. Furthermore, patients with Raynaud's phenomenon and UCTD may also occasionally exhibit this pattern. Therefore, capillarmicroscopy seems to be a useful tool for the early selection of those patients who are potential candidates for developing scleroderma spectrum disorders.

High-dose immunosuppressive therapy and autologous progenitor cell transplantation for systemic sclerosis

High-dose immunosuppressive therapy aimed at immunoablation, given together with autologous stem cell transplantation, has resulted in prolonged (>3 years) improvements of skin thickening and functional ability, together with a stabilization of pulmonary function in two-thirds of treated patients with severe systemic sclerosis. Transplant-related mortality occurred in 17% of the first cohort of 41 patients reported to the European Group for Blood and Marrow Transplantation, which included cases from the United States, but this figure has dropped to 8.7% in a recent retrospective analysis of 57 transplants performed in Europe. Similar outcomes were reported in multicentre studies from the United States of 19 patients, and from France of 12 patients, with improvements in skin scores and functional assessments, together with a stabilization of internal organ dysfunction. Based on the results of these phase I/II studies, multicentre prospective randomized trials are being planned or are in progress in Europe and the United States employing uniform patient entry criteria and outcome parameters. The aim of these studies is to compare the clinical benefits and safety of transplant regimens versus conventional chemotherapy in patients with severe systemic sclerosis who are at risk of life-threatening organ failure and premature mortality. Eligibility criteria include a diagnosis of diffuse systemic sclerosis of recent onset and major organ (heart, kidney, lungs) involvement according to predefined criteria. The prospective randomized trials address two issues related to the treatment of severe systemic sclerosis: is intensive immunosuppressive therapy superior to conventional therapy, and can self-tolerance be re-established?

Nailfold videocapillaroscopic patterns and serum autoantibodies in systemic sclerosis

BACKGROUND

Microvascular lesions are a predominant feature in systemic sclerosis (SSc) and seem to play a central pathogenetic role. Recently, we graded scleroderma microangiopathy by nailfold videocapillaroscopy (NVC) into three NVC patterns (early, active and late). The aim of the present study was to confirm, in a larger number of SSc patients, the presence of three patterns of microvascular damage, and to detect any possible relationship between these patterns and both specific serum autoantibodies and the subsets of cutaneous involvement.

METHODS

Two hundred and forty-one consecutive patients (227 women and 14 men) affected by SSc were recruited. One hundred and forty-eight patients were affected by limited cutaneous SSc (lSSc) and 93 patients by diffuse cutaneous SSc (dSSc). The ages at onset of Raynaud's phenomenon (RP) and SSc, the durations of RP and SSc, ANA and antitopoisomerase I (anti-Scl70) and anticentromere (ACA) antibodies were investigated in all patients. The SSc patients were subdivided on the basis of the NVC pattern into three groups.

RESULTS

A statistically significant correlation was found between the NVC patterns and the durations of both RP and SSc (P<0.001). Enlarged and giant capillaries, together with haemorrhages, constituted the earliest NVC finding in SSc (early NVC pattern). These abnormalities were mostly expressed in the active NVC pattern. Loss of capillaries, ramified capillaries and vascular architectural disorganization were increased in the late NVC pattern. Age and the duration of both RP and SSc were lower in 24 patients complaining of RP alone. Anti-Scl70 antibodies were statistically less frequent in the early vs both the active and the late NVC pattern, whereas no significant correlation was found between the presence of anti-Scl70 antibodies and the duration of either RP or SSc. ACA positivity was more frequent in patients with longer RP duration. Patients with lSSc had shorter SSc duration and showed the early or active NVC pattern more frequently. Conversely, patients with dSSc showed longer disease duration and mostly showed the late NVC pattern.

CONCLUSIONS

NVC is an appropriate tool for differential diagnosis between primary and secondary RP through the clear recognition of the early NVC scleroderma pattern. This study confirms, in a large number of SSc patients, the existence of three distinct NVC patterns that might reflect the evolution of SSc microangiopathy. The presence of anti-Scl70 antibodies seems be related to earlier expression of the active and late NVC patterns of SSc microvascular damage. The presence of ACA seems to be related to delayed expression of the late NVC pattern.

Phase I/II trial of autologous stem cell transplantation in systemic sclerosis: procedure related mortality and impact on skin disease

BACKGROUND

Systemic sclerosis (SSc, scleroderma) in either its diffuse or limited skin forms has a high mortality when vital organs are affected. No treatment has been shown to influence the outcome or significantly affect the skin score, though many forms of immunosuppression have been tried. Recent developments in haemopoietic stem cell transplantation (HSCT) have allowed the application of profound immunosuppression followed by HSCT, or rescue, to autoimmune diseases such as SSc.

METHODS

Results for 41 patients included in continuing multicentre open phase I/II studies using HSCT in the treatment of poor prognosis SSc are reported. Thirty seven patients had a predominantly diffuse skin form of the disease and four the limited form, with some clinical overlap. Median age was 41 years with a 5:1 female to male ratio. The skin score was >50% of maximum in 20/33 (61%) patients, with some lung disease attributable to SSc in 28/37 (76%), the forced vital capacity being <70% of the predicted value in 18/36 (50%). Pulmonary hypertension was described in 7/37 (19%) patients and renal disease in 5/37 (14%). The Scl-70 antibody was positive in 18/32 (56%) and the anticentromere antibody in 10% of evaluable patients. Peripheral blood stem cell mobilisation was performed with cyclophosphamide or granulocyte colony stimulating factor, alone or in combination. Thirty eight patients had ex vivo CD34 stem cell selection, with additional T cell depletion in seven. Seven conditioning regimens were used, but six of these used haemoimmunoablative doses of cyclophosphamide +/- anti-thymocyte globulin +/- total body irradiation. The median duration of follow up was 12 months (3-55).

RESULTS

An improvement in skin score of >25% after transplantation occurred in 20/29 (69%) evaluable patients, and deterioration in 2/29 (7%). Lung function did not change significantly after transplantation. One of five renal cases deteriorated but with no new occurrences of renal disease after HSCT, and the pulmonary hypertension did not progress in the evaluable cases. Disease progression was seen in 7/37 (19%) patients after HSCT with a median period of 67 (range 49-255) days. Eleven (27%) patients had died at census and seven (17%) deaths were considered to be related to the procedure (direct organ toxicity in four, haemorrhage in two, and infection/neutropenic fever in one). The cumulative probability of survival at one year was 73% (95% CI 58 to 88) by Kaplan-Meier analysis.

CONCLUSION

Despite a higher procedure related mortality rate from HSCT in SSc compared with patients with breast cancer and non-Hodgkin's lymphoma, the marked impact on skin score, a surrogate marker of mortality, the trend towards stabilisation of lung involvement, and lack of other treatment alternatives justify further carefully designed studies. If future trials incorporate inclusion and exclusion criteria based on this preliminary experience, the predicted procedure related mortality should be around 10%.

TNFalpha-308A allele in juvenile dermatomyositis: association with increased production of tumor necrosis factor alpha, disease duration, and pathologic calcifications

OBJECTIVE

To characterize the association between the TNFalpha-308A allele and 1) duration of active disease, 2) peripheral blood mononuclear cell (PBMC) synthesis of tumor necrosis factor alpha (TNFalpha) in vitro, and 3) pathologic calcifications in patients with juvenile dermatomyositis (DM).

METHODS

The TNFalpha-308 alleles were determined by polymerase chain reaction in 37 white patients with juvenile DM and in 29 control subjects. Patients were grouped according to duration of immunosuppressive therapy: long (> or =36 months) or short (<36 months). Unstimulated PBMC were examined by enzyme-linked immunosorbent assay for TNFalpha production in vitro. Sixty-five white patients with juvenile DM were examined for pathologic calcifications.

RESULTS

TNFalpha-308A was identified in 18 of 37 patients with juvenile DM, in contrast with 5 of 29 controls (P = 0.009). Sixteen of the 18 patients with juvenile DM who had the TNFalpha-308A allele had a disease course > or =36 months, compared with 6 of 19 patients with TNFalpha-308G (P = 0.001). PBMC from 16 of the 18 juvenile DM patients with TNFalpha-308A synthesized more TNFalpha (median 53 pg/ml) compared with PBMC from 9 of 19 patients with TNFalpha-308G (median 19 pg/ml) (P = 0.007). Nineteen of 22 juvenile DM patients requiring therapy for > or =36 months produced more TNFalpha (median 20.5 pg/ml) in comparison with 6 of 15 juvenile DM patients with a <36-month treatment course (median TNFalpha 0.0 pg/ml) (P = 0.005). Detectable calcifications were present in 3 of 8 children with juvenile DM who had TNFalpha-308AA, compared with 2 of 21 children with TNFalpha-308AG and 1 of 36 children who had TNFalpha-308GG (P = 0.017).

CONCLUSION

A long course of juvenile DM and the presence of pathologic calcifications were associated with the TNFalpha-308A allele and with the increased production of TNFalpha, which may perpetuate the inflammatory response.

Nailfold video capillaroscopy in psoriasis

Changes in the microvasculature are considered to play an important part in the pathogenesis of psoriasis and its associated arthritis. The novel method of nailfold video capillaroscopy is an extension of the technique of widefield nailfold microscopy which has been of diagnostic and predictive use in the in vivo study of the microcirculation in systemic sclerosis and other connective tissue disorders. However, similar studies in patients with psoriasis and psoriatic arthritis and/or nail changes have produced conflicting results. We tested the hypothesis that any abnormalities in nailfold capillaries of either a quantitative or qualitative nature might be observed more readily in subjects with pathology adjacent to the nailfold, i.e. distal interphalangeal (DIP) joint changes and/or nail dystrophy, when using this technique. Forty-four patients with psoriasis were recruited (21 males, 23 females). Twelve patients had psoriasis alone, 13 had psoriasis and nail changes, six had DIP joint involvement with changes of psoriasis elsewhere, and 13 had psoriasis, DIP arthritis and nail changes. Capillary density and standard capillary dimensions were studied and compared with those of 44 age- and sex-matched control subjects. There was a significant (P < 0.05) decrease in capillary loop density in patients with either psoriasis plus nail disease (14.5 +/- 5.7 capillaries per 3 mm field) or psoriasis plus nail and DIP joint disease (14.3 +/- 5. 0) when compared with controls (19.2 +/- 3.8). In patients with psoriatic arthritis affecting the DIP joints, there was a statistically significant (P < 0.05) decrease in arterial and venous capillary limb diameters, and this was also seen in those with arthritis associated with nail changes. However, there was no difference in capillary dimensions between patients with psoriasis and/or nail changes when compared with normal controls. Morphological abnormalities previously described in the literature were not noted in any of our four patient groups. Our findings of diminution in both nailfold capillary bed density and dimensions of the arterial and venous capillary limbs suggest that vascular injury, previously noted in ultrastructural studies, may play a part in the pathogenesis of psoriatic arthritis. However, in contrast to previous studies, we found no specific pattern of a morphological nature of nailfold capillaries in patients with psoriasis with or without nail changes, when compared with normal controls.

Quantitative nailfold capillary microscopy findings in patients with acrocyanosis compared with patients having systemic sclerosis and control subjects

BACKGROUND

The morphologic capillary microscopy (capillaroscopy) pattern of acrocyanosis is characterized by hemorrhages, pericapillary edema, and widened capillaries. These findings can result in a difficult differential diagnosis with systemic sclerosis (SSc).

OBJECTIVE

We sought to quantify the characteristics of the capillaroscopy pattern that distinguishes patients with acrocyanosis from patients with SSc and control subjects.

METHODS

A videomicroscope with fiberoptic illumination and personal computer-based image processing was used to measure capillary density, giant capillaries, loop width, and arterial and venous limbs in 10 patients with acrocyanosis, 10 patients with SSc, and 10 healthy control subjects.

RESULTS

Acrocyanotic patients differed in every quantitative parameter both from control subjects and patients with SSc. In particular, capillary density, which was reduced compared with that of control subjects, was much higher than that of patients with SSc: one giant capillary per finger was observed in 2 patients with acrocyanosis, whereas more than 2 giant capillaries per finger were observed in each patient with SSc.

CONCLUSION

These differences may aid in making the distinction between the capillaroscopy patterns in acrocyanosis and SSc.

Quantitative analysis of nailfold capillary abnormalities in patients with connective tissue diseases

BACKGROUND

Nailfold capillary microscopy has been shown to reflect microvascular disturbances mainly in connective tissue diseases including systemic sclerosis (SSc).

METHODS

Nailfold capillary abnormalities were analyzed with a light microscope under immersion oil at magnifications of x60 and x400.

RESULTS

Abnormal nailfold capillary pattern in SSc was different from that of systemic lupus erythematosus (SLE) and normal controls, but not from dermatomyositis (DM). Seventy-two per cent of patients with Raynaud's phenomenon showed an abnormal nailfold capillary pattern. In primary Raynaud's phenomenon, 12% of subjects developed undifferentiated connective tissue disease. In undifferentiated connective tissue disease, 23% developed SSc. The apical limb width, capillary width and capillary length of subjects who developed SSc were significantly larger than in those who did not. With regard to the clinicolaboratory findings, the occurrence rate of an abnormal apical limb width, abnormal capillary width, abnormal capillary length, and antinuclear antibody in patients who developed SSc was significantly higher than in those who did not. An abnormal capillary pattern correlated with an elevated pulmonary artery resistance. All the patients with pulmonary arterial hypertension showed an abnormal capillary pattern, decreased diffusion capacity for carbon monoxide, and elevated pulmonary vascular resistance. Nailfold capillary abnormalities show a close relation to pulmonary arterial hypertension.

CONCLUSIONS

Nailfold capillary abnormalities are useful for detecting vascular abnormality in clinical practice. These facts stress the importance of nailfold capillary abnormalities in SSc.

The predictive value of quantitative nailfold capillary microscopy in patients with undifferentiated connective tissue disease

The present prospective study was undertaken to follow the natural history of patients with Raynaud's phenomenon and to document in these patients the frequency with which secondary disorders develop. Seventeen patients with primary Raynaud's phenomenon (PRP) and 43 patients with undifferentiated connective tissue disease (UCTD) were examined after 6-8 years to see whether they had developed into UCTD or systemic sclerosis (SSc), respectively. Their nailfold capillary parameters were analysed statistically to ascertain whether they would predict for the development of the diseases into UCTD or SSc. Two patients with PRP(12%) developed into UCTD, and 10 patients with UCTD (23%) into SSc. In PRP, all three parameters of the patients who developed into UCTD showed a tendency to be larger than in those who did not develop UCTD. In UCTD, the apical limb width (P < 0.02), capillary width (P < 0.01) and capillary length (P < 0.01) of the subjects who developed SSc were significantly larger than those who did not. Of the clinicolaboratory findings in patients with UCTD, the occurrence rate of abnormal apical limb width (relative risk 20. 7, P < 0.01), abnormal capillary width (relative risk 10.7, P < 0. 01), abnormal capillary length (relative risk 9.2, P < 0.02) and antinuclear antibody (relative risk 9.6, P < 0.05) showed a significant predictive value for the development of UCTD into SSc. These results indicate that quantitative nailfold capillary microscopy, as well as antinuclear antibody, will provide exact predictive information in patients with UCTD in clinical practice.