RT Book, Section
A1 Doherty, Gerard M.
SR Print(0)
ID 58094989
T1 Mitral Regurgitation (MR)
T2 Quick Answers Surgery
YR 2010
FD 2010
PB The McGraw-Hill Companies
PP New York, NY
SN 
LK accesssurgery.mhmedical.com/content.aspx?aid=58094989
RD 2024/04/24
AB •  Fibrous  annulus  of  mitral  valve  (MV)  is  thin,  incomplete  ring  of  fibrous  tissue•  Most  MVs  have  anterior  and  posterior  leaflets,  attached  by  thin  fibrous  chordae  tendineae  to  papillary  muscle•  Closed  during  systole  via  action  of  papillary  muscle  contraction,  open  during  diastole  when  LA  pressure  higher  than  LV  pressure•  Etiology  includes:  -Rheumatic  heart  disease-Idiopathic  MV  calcification-Mitral  valve  prolapse  (MVP)-Infective  endocarditis-Ischemic  MR•  Postinfarction  papillary  muscle  rupture:  0.1%  of  coronary  artery  disease;  congestive  heart  failure  with  new  murmur  days  after  myocardial  infarction•  MR  results  in  LA  hypertension,  resulting  in  pulmonary  congestion,  dyspnea,  pulmonary  hypertension,  RV  failure•  LV  is  subjected  to  chronic  volume  overload  causing  LV  failure  (unlike  mitral  stenosis)