| TTV | tracheal transport velocity; transfusion-transmitted virus |
|---|---|
| VTM | mechanical tidal volume; virus transport medium |
| VTR | variable tandem repeats; videotape recording; vesicular transport system |
| ASD | Atrial Septal Defect Types of ASD 1. Ostium Primum ASD  ... |
| ECD | Endocardial Cushion Defect |
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