Digital clubbing in cystic fibrosis: the nails as clues to advanced disease

Digital clubbing in cystic fibrosis: the nails as clues to advanced disease Supplemental Figure 1: Diagram of Lovibond Angle The Lovibond angle describes the angle between the nail plate and proximal nail fold. In patients with normal digits, this angle is approximately 160º. In patients with digital clubbing, this angle is >180º. Supplemental Figure 2: Diagram of Schamroth Sign The Schamroth sign is considered positive when there is loss of the diamond-shaped window between the nails when the fingernails are opposed. Supplemental Figure 3: Diagram of DPD/IPD Ratio A DPD/IPD ratio is obtained by measuring the distal phalangeal depth (DPD) and comparing to the interphalangeal depth (IPD). A ratio <1 is normal, while a ratio ≥1 indicates the presence of digital clubbing.囊性纤维化中的杵状指（digital clubbing）：指甲作为晚期疾病的提示征象 补充图1：洛文邦角（Lovibond Angle）示意图 洛文邦角指指甲板（nail plate）与近端甲褶（proximal nail fold）之间的夹角。指体正常者的该夹角约为160°，而杵状指患者的该夹角则大于180°。 补充图2：沙姆罗征（Schamroth Sign）示意图 当双手指甲对合时，指甲间的菱形间隙消失，则判定沙姆罗征为阳性。 补充图3：DPD/IPD比值示意图 DPD/IPD比值通过测量远节指骨深度（distal phalangeal depth，DPD）并与指间深度（interphalangeal depth，IPD）进行对比得到。当比值小于1时为正常，若比值大于等于1则提示存在杵状指。