Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Schematic representation of the relation between the systemic venous return curve, which remains constant, the left ventricular (LV) function curve which moves with changing intrathoracic pressure (ITP) during breathing. Apneic baseline is shown at “A”. With spontaneous inspiration, ITP decreases so does right atrial pressure but cardiac output increases (“B”), whereas, the opposite occurs with positive-pressure inspiration (“C”). ITP, intrathoracic pressure.
