RT Book, Section
A1 Noel, Richard J.
A2 Zaoutis, Lisa B.
A2 Chiang, Vincent W.
SR Print(0)
ID 1146116904
T1 Disorders of Gastric Emptying
T2 Comprehensive Pediatric Hospital Medicine, 2e
YR 2017
FD 2017
PB McGraw-Hill Education
PP New York, NY
SN 9780071829281
LK accesspediatrics.mhmedical.com/content.aspx?aid=1146116904
RD 2024/04/19
AB Passage  of  the  alimentary  bolus  from  the  stomach  to  the  duodenum  constitutes  an  important  anatomical  and  functional  transition  point  in  the  digestive  process.  The  stomach  functions  as  both  a  digestive  organ  and  a  temporary  reservoir  for  the  alimentary  bolus.  The  stomach  can  be  divided  into  a  proximal  half  that  functions  as  a  reservoir,  and  via  receptive  relaxation,  can  accommodate  changes  in  volume  from  the  fasted  to  the  postprandial  state.  Contractions  in  this  region,  together  with  the  chemical  action  of  hydrochloric  acid  and  pepsin,  further  digest  the  triturated  bolus.  Weak  contractions  propel  the  bolus  towards  the  antrum,  where  stronger  contractions  are  coordinated  with  the  duodenum  and  result  in  progressive  emptying  of  the  stomach  across  the  pylorus.  The  rate  of  emptying  is  influenced  by  the  physical  nature  of  the  meal,  with  liquids  emptying  more  rapidly  than  solids,  and  foods  with  lower  caloric  density  emptying  more  rapidly  than  foods  with  higher  caloric  density.