La «duda clave» de Torrent Guasp

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“…As a result of this anatomo-functional process, the apex (space between the two bands) has in normal conditions the power of annular narrowing (sphincter-like mechanism) to bear the retrograde intraventricular pressure produced by blood ejection. At the beginning of the isovolumic (active) phase, erroneously considered as belonging to diastole, which instead should be named suction phase, the persistent contraction of the ascending band with left ventricular lengthening generates the fall of intraventricular pressure, sufficient to achieve ventricular suction [17][18][19]. This pressure fall produced by the persistent contraction of the ascending band during the isovolumic phase with every left ventricular orifice closed, works as a "plunger" mechanism (suction phase) at the moment it starts lengthening.…”