Right ventricular function at rest and during submaximal exercise assessed by 81Krm equilibrium ventriculography in...

Area of Science:

• Cardiovascular imaging
• Nuclear cardiology
• Physiology

Background:

• Right ventricular function assessment is crucial for diagnosing cardiac conditions.
• Accurate measurement of right ventricular ejection fraction (RVEF) is essential.
• Existing methods for RVEF calculation may have limitations.

Purpose of the Study:

• To evaluate the utility of 81Krm equilibrium ventriculography for assessing right ventricular function.
• To compare the accuracy of 'anatomical' lung subtraction versus conventional background correction in RVEF calculation.
• To define the exercise response of the normal right ventricle.

Main Methods:

• Utilized 81Krm equilibrium ventriculography in 37 healthy male volunteers.
• Compared 'anatomical' lung subtraction with conventional background correction for RVEF.
• Assessed right ventricular response during graded submaximal exercise in 23 subjects.

Main Results:

• Resting RVEF was significantly higher with 'anatomical' lung subtraction (0.59 ± 0.06) compared to background correction (0.55 ± 0.05).
• Right ventricular ejection fraction progressively increased during exercise (0.55 at rest, 0.60 at 50 W, 0.66 at 100 W).
• The method is well-suited for evaluating right ventricular function at rest and during exercise.

Conclusions:

• 81Krm equilibrium ventriculography is a suitable method for assessing right ventricular function.
• 'Anatomical' lung subtraction enhances the accuracy of RVEF calculation.
• RVEF values are dependent on the image analysis method used.