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[Determination of left ventricular volume by cardiac angio-scintigraphy at equilibrium. Comparison with a radiologic
Insights
Cardiac angioscintigraphy accurately measures left ventricular end-diastolic volume (EDV) using a novel in vitro red cell labelling technique. This method provides a reliable alternative for assessing cardiac function in patients with various heart conditions.
Area of Science:
- Cardiology
- Nuclear Medicine
- Medical Imaging
Background:
- Assessing left ventricular end-diastolic volume (EDV) is crucial for evaluating cardiac function.
- Traditional methods may have limitations in accuracy or accessibility.
- Equilibrium cardiac angioscintigraphy offers a non-invasive approach to cardiac imaging.
Purpose of the Study:
- To validate a new method for calculating EDV using cardiac angioscintigraphy.
- To assess the correlation between scintigraphic EDV and radiological EDV.
- To determine the accuracy and reliability of this scintigraphic technique.
Main Methods:
- In vitro red blood cell labelling followed by equilibrium cardiac angioscintigraphy.
- Utilized left anterior oblique and anterior views with a reference syringe for radioactivity and distance measurement.
- An algorithm automatically calculated EDV and other volumes using a correction factor for individual absorption.
- Compared scintigraphic EDV with radiological EDV in 100 patients.
Main Results:
- A highly significant correlation was found between radiological and scintigraphic EDV (r = 0.953, p ≤ 0.001).
- The regression line was close to identity (EDVs = 1.05 . EDVR - 5 ml).
- Mean deviation was 35.7 ml (13.7% of EDVR), with significant discrepancies in only 7 patients.
Conclusions:
- Cardiac angioscintigraphy with in vitro red cell labelling is a highly accurate method for determining left ventricular end-diastolic volume.
- This technique offers a reliable and reproducible alternative for assessing cardiac volumes.
- The method shows excellent agreement with radiological measurements, with minimal discrepancies in most patients.
Abstract:
Cardiac angioscintigraphy at equilibrium was performed after in vitro red cell labelling in the left anterior oblique and anterior views. A syringe of 10 ml labelled blood was placed on the patient's chest over the left ventricle and in contact with the camera's collimator in the LAO incidence. This syringe plays a dual part: as a direct reference for left ventricular radio-activity and as a marker for measuring the distance between the centre of gravity of the LV and the collimator by Links' method. The correction factor for absorption varies with each individual. An algorithm integrating this data automatically calculates the EDV in millilitres (ml) and the end diastolic and systolic volumes from the ejection fraction (EF) determined by an independent method. The study group was 100 patients (91 men, 9 women; 81 coronary, 11 valvular heart and 8 other diseases) with radiological EDV ranging from 107 to 1 283 ml and radiological EF ranging from 14 to 75 p. 100. A very significant correlation was observed between the radiological and scintigraphic EDV with a regression line close to that of identity: EDVs = 1.05 . EDVR-5 ml (or -3 ml/m2); SD = 48 ml; r = 0.953; p less than or equal to 0.001. The mean deviation between the methods was 35.7 ml (median 24 ml) or 13.7 p. 100 (median 9.4 p. 100) of EDVR. A large discrepancy (over 90 ml or 30 p. 100) was observed in only 7 patients, 4 of whom had severe mitral regurgitation.(ABSTRACT TRUNCATED AT 250 WORDS)