Changes in a murmur with respiration (inhalation) can help distinguish a right-sided murmur from its corresponding left-sided murmur. All right-sided murmurs increase with inspiration (Carvallo sign).

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Carvallo’s sign occurs when the murmur of tricuspid valve regurgitation gets louder with deep inspiration. This, as well as the location of the murmur, helps to distinguish tricuspid regurgitation ...

The cause of this murmur has been the subject of much speculation. A glance at the various explanations 9–20 and comments regarding the Flint murmur (Table 1) demonstrates that the etiology remains ...