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Related Experiment Videos

Diastolic ventricular interaction in chronic heart failure

J J Atherton1, T D Moore, S S Lele

  • 1Cardiology Department, University of Wales College of Medicine, Health Park, Cardiff, UK.

Lancet (London, England)
|June 14, 1997
PubMed
Summary

Diastolic ventricular interaction, where one ventricle affects the other, was observed in heart failure patients. This finding highlights the importance of venodilator therapy for managing chronic heart failure.

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Area of Science:

  • Cardiology
  • Physiology

Background:

  • Diastolic ventricular interaction occurs when one ventricle's volume influences the other.
  • This interaction is minimal normally but pronounced in pulmonary hypertension and volume overload states.
  • In heart failure, acute volume unloading can paradoxically increase left ventricular end-diastolic volume.

Purpose of the Study:

  • To investigate the clinical significance of diastolic ventricular interaction in patients with chronic heart failure.
  • To assess the effect of acute volume unloading on ventricular volumes in heart failure patients compared to healthy controls.

Main Methods:

  • Radionuclide technique with cardiac scintigraphy was employed.
  • Acute volume unloading was induced using 30 mm Hg lower-body suction.
  • Right and left ventricular end-diastolic volumes were measured in 21 heart failure patients and 12 healthy controls.

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Main Results:

  • Nine heart failure patients exhibited a paradoxical increase in left ventricular end-diastolic volume during lower-body suction.
  • This paradoxical response was not observed in the control group.
  • Higher pulmonary arterial and pulmonary capillary wedge pressures were noted in heart failure patients showing this interaction.

Conclusions:

  • Diastolic ventricular interaction is suggested to be common in chronic heart failure patients.
  • The findings underscore the importance of venodilator therapy in managing heart failure.
  • The Frank-Starling mechanism may explain increased stroke volume with lowered pulmonary capillary wedge pressure in some heart failure patients.