Would a partial atrioventicular septal defect avsd show on echo in an adult?

Yes.: Any intracardiac defect with shunting should be identifiable to an experienced echocardiographer. In the event that a patient's body habitus makes it difficult to view some or all cardiac structures, a trans-esophageal view might be required.

Yes: A partial avsd can be associated with a murmur and yet the patient may have no symptoms. It may not require surgery. It wil depend on the size of the defect and valve issues. A cardiac echocardiogram/doppler study (performed by someone familiar with congential heart defects, such as a board-certified pediatric cardiologist ) can detect the partial avsd.