根据手掌血管构成的特殊性，将断掌分为四个类型，即掌指动脉型、掌弓动脉型、掌弓主干型及混合型。
According to characteristics of palmar vessels and bones, amputation of palm can be divided into 4 clinical types, which are common digital vessel, palmar arch, common branch and mixed palmar type.
操作：施术者用两手全掌着力，沿受术者肋弓下缘作施转运摩，反复操作六至三十六次。
Operation: The performer puts his palms with strength to rub circly along the side of ribs of beneficiary repeatedly for six to thirty six times.
结果：指动脉的远侧掌横弓位于甲根平面、甲根平面以远和以近者分别占73％、19％和8％。
Results:The distal transverse palmar arches(DIPA) were 73%, 19% and 8% in nail root cross section, distal and proximal nail root respectively.
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