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Related Experiment Videos

Changes in ventricular hemodynamics caused by a systemic-pulmonary shunt.

B A Keagy, C L Lucas, G W Henry

    The Journal of Surgical Research
    |October 1, 1985
    PubMed
    Summary

    Systemic pulmonary shunts significantly increase left ventricular output, stroke volume, and stroke work. These shunts also decrease left ventricular afterload, despite reduced diastolic aortic pressure.

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    Area of Science:

    • Cardiovascular Physiology
    • Surgical Innovation
    • Hemodynamic Research

    Background:

    • Systemic pulmonary shunts, both created and obliterated, are common in clinical practice.
    • The quantitative impact of these vascular communications on left ventricular hemodynamics remains incompletely understood.

    Purpose of the Study:

    • To quantitatively assess the effects of systemic pulmonary shunts on left ventricular hemodynamics.
    • To analyze the relationship between shunt flow and left ventricular performance parameters.

    Main Methods:

    • Surgical creation of a shunt between the descending thoracic aorta and left main pulmonary artery in nine mongrel dogs.
    • Monitoring of left ventricular output (LVO) and shunt flow (SF) using electromagnetic flow probes.
    • Measurement of right atrial, aortic, and pulmonary artery pressures, with analysis of 192 data points across varying shunt flows.

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    Main Results:

    • Increased left ventricular output (LVO), stroke work (SW), and stroke volume (SV) were linearly related to shunt flow (SF) (P < 0.01, r = 0.64-0.99).
    • Decreases in left ventricular resistance (RES) and diastolic aortic pressure (DAOP) were observed with increasing SF (P < 0.01, r = 0.61-0.99).
    • At a shunt flow of 1.5 liters/min, significant increases in SV (46%), SW (32%), and LVO (48%) were noted, alongside decreases in DAOP (15%) and RES (32%).

    Conclusions:

    • Systemic pulmonary shunts lead to a substantial increase in left ventricular stroke work.
    • Despite reduced afterload and diastolic pressure, left ventricular performance is significantly enhanced by shunting.