Retinopathy of Prematurity-assist: Novel Software for Detecting Plus Disease

PURPOSE: To design software with a novel algorithm, which analyzes the tortuosity and vascular dilatation in fundal images of retinopathy of prematurity (ROP) patients with an acceptable accuracy for detecting plus disease. METHODS: Eighty-seven well-focused fundal images taken with RetCam were classified to three groups of plus, non-plus, and pre-plus by agreement between three ROP experts. Automated algorithms in this study were designed based on two methods: the curvature measure and distance transform for assessment of tortuosity and vascular dilatation, respectively as two major parameters of plus disease detection. RESULTS: Thirty-eight plus, 12 pre-plus, and 37 non-plus images, which were classified by three experts, were tested by an automated algorithm and software evaluated the correct grouping of images in comparison to expert voting with three different classifiers, k-nearest neighbor, support vector machine and multilayer perceptron network. The plus, pre-plus, and non-plus images were analyzed with 72.3%, 83.7%, and 84.4% accuracy, respectively. CONCLUSIONS: The new automated algorithm used in this pilot scheme for diagnosis and screening of patients with plus ROP has acceptable accuracy. With more improvements, it may become particularly useful, especially in centers without a skilled person in the ROP field.

Brown-McLean Syndrome in a Patient with Hallermann-Streiff Syndrome

No abstract available.

Glomerular filtration rate estimates based on serum creatinine level in healthy people: conventional Jaffe method versus calibrated Jaffe method at laboratories in Rasht

Conventional Jaffe method of serum creatinine measurement is influenced by several drugs and components of blood as well as the expertise of laboratory staffs. We obtained blood samples of 22 healthy volunteers and sent them to 23 laboratories in Rasht, Iran, in which the conventional Jaffe method would be used for serum creatinine measurement. Also, we tested the samples in 1 reference laboratory with the calibrated Jaffe method. Glomerular filtration rates were calculated using the abbreviated equation of the Modification of Diet in Renal Disease study. Eight of 23 laboratories [34.7%] reported significantly different mean serum creatinine levels from the mean values yielded in the reference laboratory. Seven of 23 laboratories [30.4%] had significantly different estimated glomerular filtration rates in comparison to those calculated in the reference laboratory. Different results for creatinine lead to wrong interpretation of patients' kidney function, and rectifications of this divergence are of utmost importance