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Titolo:
DOES SPONTANEOUS RESPIRATION ALTER PULMONARY-ARTERY INPUT IMPEDANCE
Autore:
CASTIGLIONI P; DIRIENZO M; GROSSONI M; TOMMASINI R;
Indirizzi:
LARC CTR BIOINGN,VIA GOZZADINI 7 I-20148 MILAN ITALY OSPED S CARLO BORROMEO,DIV CARDIOL MILAN ITALY
Titolo Testata:
The European respiratory journal
fascicolo: 11, volume: 9, anno: 1996,
pagine: 2328 - 2334
SICI:
0903-1936(1996)9:11<2328:DSRAPI>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
HEMODYNAMICS;
Keywords:
CHARACTERISTIC IMPEDANCE; INPUT IMPEDANCE; PULMONARY ARTERIAL PRESSURE; PULMONARY BLOOD FLOW; PULMONARY CIRCULATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
25
Recensione:
Indirizzi per estratti:
Citazione:
P. Castiglioni et al., "DOES SPONTANEOUS RESPIRATION ALTER PULMONARY-ARTERY INPUT IMPEDANCE", The European respiratory journal, 9(11), 1996, pp. 2328-2334

Abstract

The aim of this study was to determine whether spontaneous respiration influences pulmonary artery input impedance, a question that has received little attention in the literature. Impedance values were assessed during three different phases of the respiratory cycle, namely inspiration, expiration and postexpiration (i.e. the null respiratory flowperiod between expiration and the next inspiration) in five anaesthetized spontaneously breathing dogs, Firstly, impedance values during postexpiration were taken as the reference baseline, and compared with values obtained during inspiration and expiration, Then, differences between values in inspiration and in expiration were tested, taking impedance during inspiration as the baseline, Differences with respect to postexpiration were found for three parameters of input impedance: input resistance, characteristic impedance, and the frequency at the first zero-crossing of the impedance phase from negative to positive values (fcross), Input resistance was significantly lower in inspiration (85% of the baseline), characteristic impedance was significantly greater in inspiration and in expiration (112 and 119% respectively), and fcross was significantly lower in expiration (89%), By contrast, only input resistance differed significantly when inspiration was compared toexpiration. Therefore, spontaneous respiration was shown to influenceinput impedance significantly, The observed changes in characteristicimpedance and fcross might be explained by a stiffening of the pulmonary artery wall, due to neural and/or mechanical factors, during inspiration and expiration.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/11/20 alle ore 09:09:22