Final answer:
If no initial aspiration occurs in scintigraphy but aspiration occurs later, the most likely reason for aspiration is delayed emptying of the stomach, also known as gastroparesis.
Step-by-step explanation:
In Scintigraphy, if initially no aspiration occurs but after several min. or hrs. aspiration occurs, the reason for the aspiration is likely a delayed emptying of the stomach, also known as gastroparesis. Gastroparesis is a condition where the muscles in the stomach don't function properly, leading to delayed gastric emptying.
This condition can be caused by various factors such as diabetes, viral infections, certain medications, or neurological disorders. It may result in symptoms such as nausea, vomiting, bloating, and feeling full quickly.
Scintigraphy is a diagnostic test that involves the use of a radioactive tracer to track the movement of food through the digestive system. It can help identify abnormalities in gastric emptying and diagnose conditions like gastroparesis.