Characterization of microvascular disease in pediatric sickle cell disease using nailfold capillaroscopy

• Published in: Microvascular research Vol. 136; p. 104150
• Main Authors: Bharara, Rabani, Browne, Rasheda, Seydafkan, Shabnam, Salciccioli, Louis, Rehman, Muzammil, Zhang, Yaoping, Tena, Meseret, Malhi, Princy, Hanono, Monique, Chen, Shannon X., Daich, Jonathan, Lazar, Jason M.
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 01.07.2021
• Subjects: Adolescent; Anemia, Sickle Cell - diagnostic imaging; Capillary; Case-Control Studies; Child; Child, Preschool; Cross-Sectional Studies; Female; Humans; Male; Microscopic Angioscopy; Microvascular; Microvascular Density; Microvessels - diagnostic imaging; Nailfold capillaroscopy; Nails - blood supply; Predictive Value of Tests; Sickle cell disease; Microvascular; Nailfold capillaroscopy; Sickle cell disease; Capillary
• DOI: 10.1016/j.mvr.2021.104150
• ISSN: 0026-2862

Sickle cell disease (SCD) is a disorder with repetitive vaso-occlusive crises resulting in microvascular obstruction and tissue ischemia that may lead to multi-organ ischemia and dysfunction. Nailfold videocapillaroscopy (NFC) is an imaging technique utilized in clinical rheumatology to visualize capillaries located near the fingertip. To characterize NFC abnormalities in the setting of pediatric SCD, we performed NFC using a video capillaroscope on 8 digits in 44 stable SCD patients and 65 age matched healthy controls. Mean capillary number was lower (6.4 ± 1.3 vs 7.5 ± 1.8, p = 0.001) in the SCD group compared to controls. The percentage of dilated capillaries was similar (7.1 ± 8.3 vs. 5.9 ± 8.2, p = 0.4). The large majority of capillaries visualized in the SCD and control groups were normal capillary types per the EULAR definition, with a similar percentage of normal, nonspecific capillary morphologies and abnormal types. Regarding normal capillary sub-types, the SCD group and controls exhibited similar percentages of stereotype hairpin shapes, and tortuous or once or twice crossing type capillaries. On multivariate analyses, mean capillary number was independently associated with SCD after adjusting for age, body mass index, systolic blood pressure and gender. In conclusion, pediatric SCD is associated with lower capillary number but similar percentage of dilated capillaries and morphology on NFC. In our SCD cohort, capillary number was unrelated to our available markers of disease severity, including history of sickle crises, previous hospitalization for crises or Hemoglobin F levels. •Sickle cell disease and abnormal nailfold capillaroscopy in pediatric patients.•There is lower capillary density, but similar morphologic features to normals.•Nailfold capillary abnormalities are unrelated to biomarkers of disease severity.