Which of the following descriptions are right about auscultation of bowel sounds?
A.
Bowel sounds appear about 8-12 times per minute.
B.
Active bowel sounds can be heard in acute gastroenteritis, taking laxatives or gastrointestinal bleeding.
C.
Hyperactive bowel sounds can be heard in mechanical obstruction.
D.
Decreased bowel sounds can be heard in senile constipation.
E.
Bowel sounds disappearance can be heard in acute peritonitis or paralytic ileus.