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Changes in left ventricular function in shocked newborns

B Simma1, M G Fritz, R Trawöger

  • 1Pediatric Intensive Care Unit, Children's Hospital, Innsbruck, Austria.

Intensive Care Medicine
|November 5, 1997
PubMed
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This summary is machine-generated.

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In newborns with shock, fluid replacement primarily increases stroke volume, not heart rate, to improve cardiac output. Cardiac output is also influenced by the severity of respiratory illness.

Area of Science:

  • Neonatal Physiology
  • Cardiovascular Research
  • Pediatric Critical Care

Background:

  • Neonates with hypotension often require fluid resuscitation.
  • The compensatory mechanisms for maintaining cardiac output in neonates are not fully understood.
  • Distinguishing between hypovolemic and cardiogenic shock is crucial for appropriate management.

Purpose of the Study:

  • To determine if fluid replacement in neonates increases cardiac output through stroke volume or heart rate.
  • To investigate the impact of mechanical ventilation on hemodynamic status.
  • To explore the relationship between respiratory disease severity and cardiac function.

Main Methods:

  • Prospective study in a level III neonatal intensive care unit.
  • Included 15 newborns with hypotension (blood pressure < 10th percentile).

Related Experiment Videos

  • Administered Ringer's lactate (20 ml/kg) and performed echocardiography before and after.

    • Main Results:

    • Fluid replacement significantly increased cardiac output and stroke volume, while heart rate remained unchanged.
    • Blood pressure also significantly improved after fluid administration.
    • Cardiac index showed a significant inverse correlation with respiratory disease severity (A-aDO2 and oxygenation index).

    Conclusions:

    • Stroke volume, not heart rate, is the primary determinant of cardiac output changes after fluid resuscitation in neonates with shock.
    • Cardiac output in these neonates is dependent on the severity of their respiratory disease.