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 (PAP_m) were obtanined by stepwise regressional 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/ √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.

Keywords

Latent pulmonary hypertension / exercise-load test / noninvasive diagnosis / right heart catheterization