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[Left ventricular volume curve analysis using gated blood pool emission computed tomography]
Y Fujiwara1, T Mochizuki, T Ito
1Second Department of Internal Medicine, Ehime University School of Medicine.
Insights
Gated blood pool SPECT accurately assesses left ventricular function, showing reduced peak ejection rate and ejection fraction in myocardial infarction patients compared to normal controls and hypertrophic cardiomyopathy. This technique correlates well with conventional methods for evaluating cardiac volumes and ejection dynamics.
Area of Science:
- Cardiovascular Imaging
- Nuclear Cardiology
- Cardiac Physiology
Background:
- Accurate assessment of left ventricular (LV) volume and function is crucial for diagnosing and managing various cardiac conditions.
- Traditional methods for LV volume analysis have limitations, necessitating the exploration of advanced imaging techniques.
- Gated blood pool emission computed tomography (SPECT) offers a potential non-invasive approach for quantitative LV volume analysis.
Purpose of the Study:
- To evaluate the accuracy of gated blood pool SPECT in assessing left ventricular (LV) volume and ejection dynamics.
- To compare LV functional parameters derived from SPECT with those obtained from conventional multi-gated acquisition (MUGA) scans.
- To investigate differences in LV function among patients with myocardial infarction (MI), hypertrophic cardiomyopathy (HCM), dilated cardiomyopathy (DCM), and normal controls.
Main Methods:
- Gated blood pool SPECT was performed on patients with MI, HCM, DCM, and normal controls, with image acquisition synchronized to the QRS complex.
- Cardiac cycles were divided into 9-10 frames, and LV volume was determined using a 50% threshold cut-off.
- LV volume curves were fitted using Fourier analysis to calculate peak ejection rate (PER), peak filling rate (PFR), end-diastolic volume (EDV), end-systolic volume (ESV), and ejection fraction (EF).
Main Results:
- SPECT demonstrated good correlations with conventional MUGA scans for PER (r=0.694), PFR (r=0.527), and EF (r=0.682).
- Patients with MI exhibited significantly lower PER and EF compared to normal controls and HCM patients (p<0.05).
- SPECT-derived EDV and ESV showed strong correlations with MUGA measurements (r=0.877 and r=0.876, respectively).
Conclusions:
- Gated blood pool SPECT is a reliable method for assessing left ventricular volume and ejection dynamics, correlating well with conventional MUGA scans.
- SPECT can effectively differentiate impaired LV function in myocardial infarction from normal or hypertrophic cardiomyopathy.
- This technique provides valuable quantitative data for the clinical evaluation of cardiac function in various cardiomyopathies.
Abstract:
Analysis of the left ventricular volume curve was performed using gated blood pool emission computed tomography (SPECT) in six patients with old myocardial infarction (MI), five with hypertrophic cardiomyopathy (HCM), three with dilated cardiomyopathy (DCM), and five normal controls (N). Image collection was synchronized with the QRS complex, and each cardiac cycle was divided into nine to 10 frames. In each frame, left ventricular volume was determined based on the number of voxels above the threshold level (50% cut-off level), and the volume curve was fitted to the third harmonics of Fourier analysis. From the fitted curve, the peak ejection rate (PER), the peak filling rate (PFR), end-diastolic volume (EDV), end-systolic volume (ESV) and ejection fraction (EF) were calculated. 1. There were good correlations between SPECT and the conventional gated blood pool (MUGA) for PER (r = 0.694, p less than 0.005), PFR (r = 0.527, p less than 0.025) and EF (r = 0.682, p less than 0.005). 2. PER in MI (2.21 +/- 0.55, mean +/- SD) was lower than in N (3.68 +/- 0.80, p less than 0.05) and HCM (4.85 +/- 2.39, p less than 0.05), and EF in MI (36.6 +/- 6.4) was lower than in HCM (68.7 +/- 23.7, p less than 0.05). 3. There were good correlations between EDVs (y = 1.11x + 5.71, r = 0.877, p less than 0.01), and ESVs (y = 1.05x - 3.88, r = 0.876, p less than 0.01) estimated by MUGA and SPECT.(ABSTRACT TRUNCATED AT 250 WORDS)