title: Sex- and age-dependence of platelet aggregation in diabetes mellitus.
abstract: Platelet aggregate ratios (PAR) were determined, and threshold concentrations (ED50) of epinephrine, adenosine diphosphate (ADP), and collagen were estimated by platelet aggregometry in 88 IDDM and 52 NIDDM patients without hyperlipidaemia or azotaemia, and in 106 healthy volunteers to revise the question of hyperaggregability in diabetes. ED50-s showed a tendency for negative correlation with age, significant in female but not in male controls. Similar trends were obtained in IDDM and NIDDM females, but were not in IDDM and NIDDM males. The ED50-s of different aggregating agents positively correlated with each other. ED50-s were higher in men than in women in both controls and IDDM patients. Similar but minor differences were observed between women and men in NIDDM. IDDM patients had significantly lower PAR and collagen ED50, and a tendency for epinephrine and ADP to be lower as compared to the sex- and age-matched controls. The differences of PAR were the same, while those of ED50-s were diminished in older NIDDM patients compared to the matched controls. It is concluded, that the previously observed general hyperaggregability in diabetic patients may have partly resulted from sex- and age differences. Threshold concentrations should be compared to sex- and age-matched controls.
authors.affiliation: Semmelweis University Medical School, 3rd Department of Medicine, Budapest, Hungary.
authors.forename: P
authors.initials: P
authors.lastname: Szénási
authors.forename: L
authors.initials: L
authors.lastname: Tóth
authors.forename: L
authors.initials: L
authors.lastname: Romics
authors.forename: L
authors.initials: L
authors.lastname: Kammerer
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D003920:Diabetes Mellitus / Q000097:blood*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010974:Platelet Aggregation; D012737:Sex Factors