title: Evaluation of right ventricular Tei index (index of myocardial performance) in healthy dogs and dogs with tricuspid regurgitation.
abstract: Right ventricular (RV) Tei index (index of myocardial performance) has been demonstrated to be clinically useful in estimating RV function in various human cardiac diseases. The purposes of this study were to validate the correlation between RV Tei index and RV function obtained by cardiac catheterization in healthy dogs, and to evaluate the RV Tei index in dogs with tricuspid regurgitation (TR). In healthy dogs, the RV Tei index significantly correlated with the RV peak +dP/dt (r=-0.80, p<0.0001) and -dP/dt (r=0.69, p=0.0001). In normal dogs, the RV Tei index was not significantly correlated with heart rate, body weight, and age. The RV Tei index significantly increased in dogs with moderate to severe TR (0.39 +/- 0.35, p=0.0015), filariasis (0.46 +/- 0.16, p=0.0131), and trivial to mild TR and severe mitral regurgitation (MR; 0.61 +/- 0.14, p=0.0017) when compared with the normal dogs (0.17 +/- 0.10). In addition, the RV Tei index in dogs with TR significantly increased in association with pulmonary hypertension [PH(-), 0.19 +/- 0.09; PH(+), 0.65 +/- 0.14; respectively p<0.0001]. Our study has demonstrated that RV Tei index is a feasible approach to estimate RV function in dogs and is not influenced by heart rate, body weight, and aging. Further investigations are required to clarify the clinical significance of RV Tei index in dogs with right-sided cardiac diseases.
authors.affiliation: Laboratory of Veterinary Surgery, College of Bioresource Sciences, Nihon University, Fujisawa, Japan.
authors.forename: Kenji
authors.initials: K
authors.lastname: Teshima
authors.forename: Kazushi
authors.initials: K
authors.lastname: Asano
authors.forename: Koji
authors.initials: K
authors.lastname: Iwanaga
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Koie
authors.forename: Masami
authors.initials: M
authors.lastname: Uechi
authors.forename: Yuka
authors.initials: Y
authors.lastname: Kato
authors.forename: Kenji
authors.initials: K
authors.lastname: Kutara
authors.forename: Kazuya
authors.initials: K
authors.lastname: Edamura
authors.forename: Atsuhiko
authors.initials: A
authors.lastname: Hasegawa
authors.forename: Shigeo
authors.initials: S
authors.lastname: Tanaka
mesh_terms: D000375:Aging; D000818:Animals; D004283:Dog Diseases / Q000503:physiopathology*; D004285:Dogs; D004452:Echocardiography / Q000379:methods / Q000662:veterinary*; D015203:Reproducibility of Results; D014262:Tricuspid Valve Insufficiency / Q000503:physiopathology / Q000662:veterinary*; D016278:Ventricular Function, Right / Q000502:physiology*