In addition, there's connecting service from Canada, Europe, South America and the Far East. Commuter service between San Juan, St. Croix and St. Thomas is also available. Commuter airlines can transport you between islands in as little as 17 minutes.n addition, there's connecting service from Canada, Europe, South America and the Far East. Commuter service between San Juan, St. Croix and St. Thomas is also available. Commuter airlines can transport you between islands in as little as 17 minutes.
A rough estimate is that it takes about 14 hours for blood to be broken down within the intestinal lumen; therefore if transit time is less than 14 hours the patient will have hematochezia, and if greater than 14 hours the patient will exhibit melena.
Melena is a term that describes a particular appearance of blood in stools. This term describes stools that are black, tarry and often foul-smelling because of the presence of blood from the upper gastrointestinal tract.esting the stools is important because in certain specific situations, stools can take on the appearance of melena even if no bleeding is present. For example, eating black licorice, eating blueberries or taking iron pills can cause stools to have a similar appearance.