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[Cardiovascular and hemodynamic changes after artificial pulmonary ventilation]

V Gecelovská1, K Javorka

  • 1Ustav fyziológie, Jeseniovej lekárskej fakulty, Univerzity Komenského Martine, Slovakia.

Bratislavske Lekarske Listy
|May 1, 1996
PubMed
Summary

Artificial ventilation (AV) impacts cardio-respiratory systems through mechanical, reflex, and humoral mechanisms. These interactions affect cardiac function, influencing left ventricular filling and output, especially in cases of heart failure.

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Area of Science:

  • Cardiovascular Physiology
  • Respiratory Mechanics
  • Hemodynamics

Context:

  • Cardio-respiratory interactions involve complex mechanical, reflex, and humoral pathways.
  • Investigating these intertwined mechanisms separately presents significant challenges.
  • Artificial ventilation (AV), including conventional and high-frequency ventilation (HFV), directly influences these interactions.

Purpose:

  • To elucidate the multifaceted effects of artificial ventilation on cardio-respiratory interactions.
  • To detail the mechanical, reflex, and humoral mechanisms through which AV impacts cardiovascular function.
  • To explore the implications of these effects on cardiac output and ventricular performance.

Summary:

  • Increased intrapulmonary pressure during AV, including positive end-expiratory pressure (PEEP), compresses pulmonary vessels, raising pulmonary vascular resistance and impairing right ventricular function.

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  • Mechanical effects reduce left ventricular (LV) filling, stroke volume, preload, and afterload due to blood shifting and increased pulmonary vascular resistance.
  • Reflex mechanisms involve baroreflex and vagal activation, while humoral effects stem from vasoactive substance release triggered by lung expansion and circulatory changes.

    • Impact:

    • Understanding these interactions is crucial for optimizing ventilator settings and managing patients with cardiovascular compromise.
    • AV can decrease LV afterload and increase cardiac output during the ejection phase, particularly beneficial in LV failure.
    • This comprehensive analysis aids in predicting and mitigating adverse hemodynamic consequences of mechanical ventilation.