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Related Experiment Videos

Reduced oxygen consumption with effective left ventricular venting during postischemic reperfusion

K R Kanter, H V Schaff, V L Gott

    Circulation
    |August 1, 1982
    PubMed
    Summary

    Effective left ventricular (LV) venting reduces myocardial oxygen consumption (MVO2) during reperfusion after hypothermic cardioplegic arrest. Failing to vent increases MVO2, potentially harming ischemic hearts.

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    Area of Science:

    • Cardiovascular Surgery
    • Cardiac Physiology
    • Myocardial Protection

    Background:

    • Hypothermic cardioplegic arrest is used during cardiac surgery to protect the myocardium.
    • Reperfusion following ischemic arrest can lead to increased myocardial oxygen demand.
    • Left ventricular (LV) volume loading during reperfusion may exacerbate myocardial oxygen consumption.

    Purpose of the Study:

    • To investigate the impact of left ventricular (LV) venting strategies on myocardial oxygen consumption (MVO2) during reperfusion after hypothermic cardioplegic arrest.
    • To determine if different levels of LV venting affect MVO2 during the early reperfusion period.
    • To assess the influence of LV venting on MVO2 during subsequent partial cardiopulmonary bypass (CPB).

    Main Methods:

    • Utilized 29 dogs undergoing cardiopulmonary bypass (CPB) with hypothermic cardioplegic arrest (45 minutes at 20°C).

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  • Assigned dogs into three groups with varying degrees of LV venting during the initial 20 minutes of reperfusion: total venting (LVSP 0 mm Hg), partial venting (LVSP ~40 mm Hg), and minimal venting (LVSP ~75 mm Hg).
  • Measured myocardial oxygen consumption (MVO2) and monitored LV systolic pressure (LVSP) throughout the reperfusion phases.

    • Main Results:

    • MVO2 was significantly lower in the total and partial venting groups (2.66 ± 0.33 and 2.40 ± 0.36 ml O2/100 g LV/min, respectively) compared to the minimal venting group (4.62 ± 0.53 ml O2/100 g LV/min) during the first 20 minutes of reperfusion (p < 0.05).
    • No significant differences in MVO2 were observed among groups during a subsequent 10-minute partial CPB period compared to the initial reperfusion phase without CPB.
    • Higher LV systolic pressure, indicative of increased LV volume loading due to inadequate venting, correlated with elevated MVO2.

    Conclusions:

    • Effective left ventricular (LV) venting significantly reduces myocardial oxygen consumption (MVO2) during early reperfusion following hypothermic cardioplegic arrest.
    • Failure to adequately vent the left ventricle during reperfusion leads to increased myocardial oxygen demand.
    • Increased MVO2 from LV volume loading may be detrimental in hearts with significant ischemia or incomplete revascularization.