Equalization of left and right heart diastolic filling pressures at rest and exercise is typical but not pathognomonic of pericardial constriction, as it can also occur in cardiac amyloidosis.
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Pressure equalization is not pathognomonic for constriction; leaves open amyloidosis in the differential.
The resting and exercise hemodynamics in seven patients with pericardial constriction and in one patient with cardiac amyloidosis are described. Equalization of left and right heart diastolic filling pressures was observed in all cases, both at rest and during exercise. This hemodynamic response, although typical, should not be considered pathognomonic of pericardial constriction.
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Robbins et al. (1983) studied this question.
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