title: Hematoma after femoral arterial blood sampling:  incidence, imaging features, and course of hematoma.
abstract: OBJECTIVE
  This study evaluated the incidence and course of a hematoma occurring after femoral arterial sampling.
  
  
  METHODS
  We studied 270 patients who underwent computed tomography (CT) including the pelvis and blood gas sampling from femoral artery using a 22-gauge needle during 2010. This population comprised 176 men and 94 women with a mean (SD) age of 54.9 (24.3) years (range, 0-97 years). We evaluated whether hematoma was present at the femoral artery. Size and location of the hematoma, the short-axial luminal diameter of artery contact with the hematoma was also assessed.
  
  
  RESULTS
  The CT images showed hematoma around the femoral artery in 128 patients (47.4%); this group comprised 84 men and 44 women with a mean (SD) age of 51.1 (24.1) years (range, 0-92 years). Hematoma was not observed in 142 patients (52.6%; 92 men and 50 women; mean [SD] age, 58.3 [24.2] years; range, 0-97 years). There was no significant difference in age, sex, altered hemostasis, or time between arterial puncture and CT between the 2 groups with or without hematoma. Arterial stenosis of 50% or greater was observed in 7 patients (mean [SD] age, 17.1 [8.97] years; range, 6-31 years; 4 males and 3 females).
  
  
  CONCLUSIONS
  Our data revealed a high frequency of small hematoma around the femoral artery is following arterial blood sampling that was independent of bleeding diathesis. No patient progressed to a severe condition, although temporary arterial stenosis did occur.
authors.affiliation: Department of Radiology, Fukushima Medical University Hospital, Fukushima, Fukushima Prefecture, Japan. shirou@fmu.ac.jp
authors.forename: Shirou
authors.initials: S
authors.lastname: Ishii
authors.forename: Masayuki
authors.initials: M
authors.lastname: Miyajima
authors.forename: Fumio
authors.initials: F
authors.lastname: Shishido
authors.forename: Kotaro
authors.initials: K
authors.lastname: Sakuma
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001784:Blood Gas Analysis; D016009:Chi-Square Distribution; D002648:Child; D002675:Child, Preschool; D003287:Contrast Media; D005260:Female; D005263:Femoral Artery / Q000000981:diagnostic imaging* / Q000601:surgery*; D006406:Hematoma / Q000000981:diagnostic imaging* / Q000209:etiology*; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D008875:Middle Aged; D011677:Punctures / Q000009:adverse effects*; D012189:Retrospective Studies; D012307:Risk Factors; D018709:Statistics, Nonparametric; D014057:Tomography, X-Ray Computed
chemical_list: D003287:Contrast Media