title: [Factor analysis of traditional Chinese medicine syndromes in 815 patients with unstable angina].
abstract: OBJECTIVE
  To explore the laws of traditional Chinese medicine (TCM) syndromes in unstable angina, and to establish the preliminary diagnostic criteria for TCM syndromes.
  
  
  METHODS
  Multi-center prospective research on TCM syndromes in 815 cases of unstable angina was done with the nonlinear dimension reduction by factor analysis.
  
  
  RESULTS
  There were five extracted factors in factor analysis: F1, F2, F3, F4 and F5. F1 was yin deficiency of heart and kidney, F2 was deficiency of both heart and spleen, F3 was intermingled phlegm and blood stasis, F4 was qi deficiency and blood stasis, and F5 was yang deficiency and coagulated cold. Qi deficiency and blood stasis (F4) syndrome accounted for the maximum proportion. The diagnostic criteria for TCM syndromes were preliminarily and respectively established.
  
  
  CONCLUSIONS
  Qi deficiency and blood stasis is the key factor of pathogenesis. The factor analysis can help us classify traditional Chinese medicine syndromes and establish the preliminary diagnostic criteria.
authors.affiliation: Department of Cardiology, Guang'anmen Hospital, China Academy of Chinese Medical Sciences, Beijing 100053, China.
authors.forename: Jie
authors.initials: J
authors.lastname: Wang
authors.forename: Qing-yong
authors.initials: QY
authors.lastname: He
authors.forename: Hai-xia
authors.initials: HX
authors.lastname: Li
authors.forename: Yu-tao
authors.initials: YT
authors.lastname: Fang
mesh_terms: D000368:Aged; D000789:Angina, Unstable / Q000145:classification / Q000175:diagnosis*; D001809:Blood Viscosity; D017023:Coronary Angiography; D003937:Diagnosis, Differential; D005163:Factor Analysis, Statistical; D005260:Female; D006801:Humans; D008297:Male; D008516:Medicine, Chinese Traditional / Q000592:standards*; D008875:Middle Aged; D011446:Prospective Studies; D019413:Qi; D013577:Syndrome; D016711:Yang Deficiency / Q000175:diagnosis