Abstract
Contrast echocardiography or echoangiography has gained wide acceptance in many echo and cardiac catheterization laboratories (see Chapter 9). The method is applied in the verification of cardiac structures and in the demonstration of flow patterns through the recording of echoes produced by injecting into the blood stream substances such as indocyanine green, saline, blood and dextrose [1–13]. These agents are characterized by the fact that their echo-producing quality is lost during passage through the pulmonary or systemic capillary beds [2, 9, 13, 14]. Thus, when the contrast material is injected into a peripheral vein or a right heart cavity, the echoes appear only as far as the pulmonary arteries, and direct visualization of intracardiac septal defects and aortopulmonary communications are obtainable only in the presence of a right-to-left shunt. In order to demonstrate the passage of echoes from left to right it has been necessary to inject the agent directly into the left heart cavities [3, 13–16].
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Reale, A., Pizzuto, F. (1982). Pulmonary Wedge Injections for the Evaluation of Left-to-Right Shunts. In: Meltzer, R.S., Roelandt, J. (eds) Contrast Echocardiography. Developments in Cardiovascular Medicine, vol 15. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-7470-8_10
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DOI: https://doi.org/10.1007/978-94-009-7470-8_10
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