title: Reconsideration of Inferior Vena Cava Parameters for Estimating Right Atrial Pressure in an East Asian Population　- Comparative Simultaneous Ultrasound-Catheterization Study.
abstract: Ultrasound measurements of the inferior vena cava (IVC) diameter (IVCD), together with its respiratory variation, provide a noninvasive estimate of right atrial pressure (RAP). However, there is a paucity of studies that have compared this technique with simultaneous catheterization. We explored the best cut-off values of IVC parameters for elevated RAP in comparison with RAP measured by catheterization.
  
  
  
  We prospectively enrolled 120 East Asian patients who were scheduled for catheterization. The IVCD and IVC collapsibility index (IVCCI) were measured according to the current guidelines. The optimal maximum IVCD (IVCDmax) and IVCCI cut-offs for detecting elevated RAP (RAP ≥10 mmHg) were 17 mm and 40%, respectively. When we combined both in proportion to the guidelines, the sensitivity and specificity for detecting elevated RAP were 75% and 94%, respectively. When the cut-off values from the current guidelines (>21 mm and <50%) were applied, the respective sensitivity and specificity were 42% and 99%. Interestingly, the cut-off value of the optimal IVCDmax indexed by body surface area (11 mm/m2) was similar to previous Western population data. When we combined both cut-off values (11 mm/m2and 40%), the sensitivity and specificity were 75% and 95%, respectively.
  
  
  
  The optimal absolute IVCDmax and IVCCI cut-offs to detect elevated RAP were smaller than those in the current guidelines. Indexed IVCDmax may be an IVC parameter that can be used internationally.
authors.affiliation: Department of Cardiovascular Medicine, the University of Tokyo.
authors.forename: Takayuki
authors.initials: T
authors.lastname: Kawata
authors.forename: Masao
authors.initials: M
authors.lastname: Daimon
authors.forename: Seitetsu L
authors.initials: SL
authors.lastname: Lee
authors.forename: Koichi
authors.initials: K
authors.lastname: Kimura
authors.forename: Naoko
authors.initials: N
authors.lastname: Sawada
authors.forename: Shuo-Ju
authors.initials: SJ
authors.lastname: Chiang
authors.forename: Keitaro
authors.initials: K
authors.lastname: Mahara
authors.forename: Takeshi
authors.initials: T
authors.lastname: Okubo
authors.forename: Tomoko
authors.initials: T
authors.lastname: Nakao
authors.forename: Megumi
authors.initials: M
authors.lastname: Hirokawa
authors.forename: Boqing
authors.initials: B
authors.lastname: Xu
authors.forename: Tomoko S
authors.initials: TS
authors.lastname: Kato
authors.forename: Masafumi
authors.initials: M
authors.lastname: Watanabe
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Yatomi
authors.forename: Issei
authors.initials: I
authors.lastname: Komuro
mesh_terms: D000328:Adult; D000368:Aged; D044466:Asian People; D062185:Atrial Pressure; D002404:Catheterization; D003430:Cross-Sectional Studies; D005202:Asia, Eastern; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D014463:Ultrasonography; D014682:Vena Cava, Inferior / Q000000981:diagnostic imaging / Q000503:physiopathology