Pattern of right ventricular pressure fall and its modulation by afterload

• Tipo: Artigo em Revista Científica Internacional
• Data: 2004

Autores

Correia-Pinto, J (Autor) Outra; Henriques-Coelho, T (Autor) FMUP; Magalhães, S (Autor) Outra; Leite-Moreira AF (Autor) FMUP

Revista

Título: Physiological Research

Vol. 53 Nº 1

Páginas: 19-26

ISSN: 0862-8408

Editora: Akademie Ved Ceske Republiky

Indexação

ISI Web of Knowledge - 7 Citações

ISI Web of Science

Scopus - 8 Citações

Pubmed / Medline

Classificação Científica

FOS: Ciências médicas e da saúde

Outras Informações

ID Authenticus: P-000-DDP

Abstract (EN): Pattern of right ventricular pressure (RVP) fall and its afterload dependence were examined by analyzing ventricular pressure curves and corresponding pressure-dP/dt phase planes obtained in both ventricles in the rat heart in situ. Time and value of dP/dt(min), and the time constant tau were measured at baseline and during variable RV afterload elevations, induced by beat-to-beat pulmonary trunk constrictions. RVP and left ventricular pressure (LVP) decays were divided into initial accelerative and subsequent decelerative phases separated by corresponding dP/dt(min). At baseline, LVP fall was decelerative during 4/5 of its course, whereas only 1/3 of RVP decay occurred in a decelerative fashion. During RV afterload elevations, the absolute value of RV-dP/dt(min) and RV-tau increased, whilst time to RV-dP/dt(min) decreased. Concomitantly, the proportion of RVP decay following a decelerative course increased, so that in highly RV afterloaded heartbeats RVP fall became more similar to LVP fall. In conclusion, RVP and LVP decline have distinct patterns, their major portion being decelerative in the LV and accelerative in the RV. In the RV, dP/dt(min), tau and the proportional contribution of accelerative and decelerative phases for ventricular pressure fall are afterload-dependent. Consequently, tau evaluates a relatively much shorter segment of RVP than LVP fall.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 8