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[Differential diagnosis between constrictive pericarditis and cardiac amyloidosis by computerized M-mode
Insights
This study differentiates constrictive pericarditis from cardiac amyloidosis using M-mode echocardiography. Key differences in left ventricular filling and wall thinning velocities distinguish these diastolic dysfunction causes.
Area of Science:
- Cardiology
- Medical Imaging
- Biophysics
Background:
- Diastolic dysfunction is a non-specific hemodynamic syndrome.
- Constrictive pericarditis and restrictive cardiomyopathy, like cardiac amyloidosis, can cause diastolic dysfunction.
- Differentiating these conditions is crucial for appropriate patient management.
Purpose of the Study:
- To differentiate constrictive pericarditis (CP) from cardiac amyloidosis (Am) using computerised M-mode recordings of the left ventricle.
- To identify specific echocardiographic parameters that distinguish between these two causes of diastolic dysfunction.
Main Methods:
- Analysis of computerised M-mode recordings of the left ventricle in 5 cardiac amyloidosis patients, 5 constrictive pericarditis patients, and 10 normal subjects.
- Evaluation of ventricular filling parameters and diastolic thinning of the left ventricular free wall.
- Digitalization of M-mode recordings to generate graphs of chamber filling and wall thinning and their derivatives.
Main Results:
- Significant differences were observed in specific diastolic parameters between cardiac amyloidosis and constrictive pericarditis.
- Cardiac amyloidosis showed reduced maximum velocity of endocavitary diameter lengthening and free wall thinning, with prolonged rapid filling phase.
- Cardiac amyloidosis exhibited greater diastolic free wall thickness, correlating with reduced wall thinning velocity.
Conclusions:
- M-mode echocardiography, particularly analysis of ventricular filling and free wall thinning velocities, can differentiate cardiac amyloidosis from constrictive pericarditis.
- Specific quantitative parameters derived from M-mode recordings offer diagnostic value in distinguishing these conditions.
- Global diastolic filling parameters alone were insufficient to distinguish between the two conditions.
Abstract:
A diastole is a non specific haemodynamic syndrome which may result from constrictive pericarditis or from a restrictive cardiomyopathy. The aim of this study was to differentiate these two types of condition by analysis of computerised M mode recordings of the left ventricle. Three groups of patients were studied: 5 cases of confirmed cardiac amyloidosis (Am); 5 cases of constrictive pericarditis confirmed surgically (CP) and 10 normal subjects (NL). The study was based on analysis of parameters of ventricular filling and of diastolic thinning of the LV free wall. A significant difference was observed between AM and CP but not between PC and NL. Amyloidosis was characterised by a reduction in the maximum velocity of endocavitary diameter lengthening (AM 0,84 +/- 0,56 cir/sec; PC 3,95 +/- 0,77, p less than 0,01), prolongation of the rapid filling phase (AM 0,42 +/- 0,17 sec; PC 0,16 +/- 0,06 sec, p less than 0,02) and a decrease in maximum velocity of free wall thinning (AM 0,45 +/- 0,23 th/syst/sec; PC 4,79 +/- 2,1, p less than 0,01). The diastolic thickness of the free wall was greater in the amyloidosis group (AM 1,73 +/- 0,61 cm; PC 1,05 +/- 0,21, p less than 0,05) and correlated with the reduction of maximum velocity of free wall thinning. Parameters of global diastolic filling did not distinguish the two conditions. The M mode recordings were therefore digitalised to provide graphs of chamber filling and wall thinning and their derivatives.(ABSTRACT TRUNCATED AT 250 WORDS)