title: Noninvasive diagnosis of latent pulmonary hypertension in COPD by exercise-load impedance rheopneumogram: a comparative study with right heart catheterization.
abstract: Impedance rheopneumogram (IRP) and right heart Swan-Ganz catheter examinations were simultaneously carried out in 63 patients. Two equations for calculating after-exercise-pulmonary-pressure (PAPm) were obtained by stepwise regression analysis: 1) PAPm (kPa) = -1.40-0.88.InHs+8.30.(B-F)+5.78.Q-B/B-Y (r = 0.730, IRP is measured at rest); 2) PAPm(kPa) = 6.46-5.04.Hs/square root of R-R +4.35.Q-B/B-Y-19.34.(Q-C) (r = 0.648, IRP is measured after exercise). This is a new method for diagnosing latent pulmonary hypertension noninvasively.
authors.affiliation: Department of Internal Medicine, Tongji Hospital, Tongji Medical University, Wuhan.
authors.forename: Y J
authors.initials: YJ
authors.lastname: Xu
authors.forename: S F
authors.initials: SF
authors.lastname: Duan
authors.forename: Z X
authors.initials: ZX
authors.lastname: Zhang
authors.forename: G B
authors.initials: GB
authors.lastname: Zen
mesh_terms: D006328:Cardiac Catheterization; D005080:Exercise Test; D005260:Female; D006801:Humans; D006976:Hypertension, Pulmonary / Q000175:diagnosis*; D008173:Lung Diseases, Obstructive / Q000150:complications*; D008297:Male; D008875:Middle Aged; D010992:Plethysmography, Impedance; D011652:Pulmonary Circulation