Validazione della relazione pressione-lunghezza a fine eiezione quale indice di contrattilità regionale.

Translated title of the contribution: The evaluation of the end-ejection pressure-length relation as an index of regional contractility

S. Perlini, T. E. Meyer, L. Bernardi, P. L. Soldà, A. Calciati, G. Finardi, P. Foëx

Research output: Contribution to journalArticlepeer-review

Abstract

Although end-systolic pressure-length relationship (ESPLR) is now widely used as a regional substitute for the end-systolic pressure-volume relationship, there are some reservations about its use as an index of systolic performance. This study aimed at assessing whether by using end-ejection (zero aortic flow) as a definition of end-systole, ESPLR can be used to characterize myocardial performance independent of load, and if the choice of the region where to implant the sonomicrometers is critical. Ten anaesthetized dogs (16 +/- 2 kg) were instrumented with a left ventricular (LV) pressure micromanometer and an aortic flow probe. Sonomicrometers were implanted in the apical (L1) and the mid-ventricular (L2) regions of the anterior LV wall, and in the basal region of the lateral wall (L3). End-systolic pressure-length relationships were obtained during acute preload reduction induced by the inflation of a vena caval balloon. This evaluation was repeated after increasing end-diastolic pressure to 14-18 mmHg (delta PL), after increasing systolic pressure by 15 (delta P-I) and 25 mmHg (delta P-II) with graded descending aorta occlusion, and during dobutamine infusions at 2.5 (Db 2.5) and 5 micrograms/kg/min (Db5). End-systolic pressure-length relationships (r > 0.97; pressure range: 70-100 mmHg) were characterized by their slopes (Ees), the extrapolated intercept at zero pressure (L0) and the values of segment length at a pressure of 75 (L75) and 100 mmHg (L100). In all the myocardial regions studied by sonomicrometry, the increments in preload and afterload did not significantly shift ESPLR.(ABSTRACT TRUNCATED AT 250 WORDS)

Translated title of the contributionThe evaluation of the end-ejection pressure-length relation as an index of regional contractility
Original languageItalian
Pages (from-to)577-580
Number of pages4
JournalCardiologia
Volume37
Issue number8
Publication statusPublished - Aug 1992

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine

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