4 research outputs found
Wp艂yw hiperinsulinemii na cz臋sto艣膰 zgon贸w z powodu pierwotnego raka w膮troby i nowotwor贸w o innych lokalizacjach
WST臉P. Celem pracy jest wykazanie zwi膮zku insulinemii z umieralno艣ci膮 z powodu nowotwor贸w o r贸偶nych lokalizacjach.
MATERIA艁 I METODY. Prospektywne badanie kohortowe obj臋艂o 6237 aktywnych zawodowo m臋偶czyzn w wieku 44-55 lat (w momencie rozpocz臋cia badania), niechoruj膮cych na cukrzyc臋. Oceniano umieralno艣膰 z powodu nowotwor贸w w odniesieniu do wyj艣ciowych st臋偶e艅 insuliny na czczo oraz 2 godziny po doustnym obci膮偶eniu 75 g glukozy.
WYNIKI. Podczas 23,8 lat obserwacji w grupie 6237 m臋偶czyzn zmar艂o 1739, z tego 778 (45%) z powodu nowotwor贸w. Cz臋sto艣膰 zgon贸w z powodu pierwotnego raka w膮troby wykazywa艂a silny zwi膮zek z wyj艣ciow膮 hiperinsulinemi膮, zar贸wno na czczo (ryzyko wzgl臋dne 2,72; 95% CI: 1,87–3,94), jak i w 2. godzinie testu tolerancji glukozy (3,41; 2,23-5,21) - po korekcji wzgl臋dem wieku. Natomiast u os贸b z podwy偶szonym st臋偶eniem insuliny na czczo obserwowano zmniejszenie umieralno艣ci z powodu nowotwor贸w wargi, jamy ustnej i gard艂a (ryzyko wzgl臋dne 0,55; 0,41-0,75) oraz krtani (ryzyko wzgl臋dne 0,63; 0,47-0,83). St臋偶enie insuliny 2 godziny po obci膮偶eniu glukoz膮 by艂o odwrotnie proporcjonalne do cz臋sto艣ci zgon贸w z powodu raka 偶o艂膮dka (ryzyko wzgl臋dne 0,62; 0,43-0,90) i krtani (0,66; 0,50-0,89). Po uwzgl臋dnieniu innych czynnik贸w ryzyka zale偶no艣ci te pozostawa艂y niezmienione. W analizie podgrup - m臋偶czyzn pal膮cych tyto艅 oraz nienadu偶ywaj膮cych alkoholu - st臋偶enia insuliny wykazywa艂y ujemny zwi膮zek z cz臋sto艣ci膮 zgon贸w z powodu wymienionych nowotwor贸w.
WNIOSKI. Hiperinsulinemia obwodowa (wska藕nik bardzo wysokich st臋偶e艅 insuliny w uk艂adzie 偶y艂y wrotnej) koreluje ze zwi臋kszeniem umieralno艣ci z powodu pierwotnego raka w膮troby u m臋偶czyzn niechoruj膮cych na cukrzyc臋. Odwrotn膮 zale偶no艣膰 wykazano dla nowotwor贸w wargi, jamy ustnej, gard艂a, krtani oraz 偶o艂膮dka
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Obesity, body fat distribution and other risk factors of non-insulin- dependent diabetes mellitus in different ethnic groups living in East Anglia.
Digitisation of this thesis was sponsored by Arcadia Fund, a charitable fund of Lisbet Rausing and Peter Baldwin
Cardiac Syndrome X, insulin resistance and microvascular dysfunction: the use of Metformin in a double-blind randomised controlled trial
The syndrome of cardiac chest pain with a positive exercise tolerance test but angiographically normal
coronary arteries (cardiac Syndrome X) is a common clinical scenario. There is now a good evidence
base, suggesting that these patients are relatively insulin resistant and have abnormalities of coronary
and peripheral vasomotor function. I begin by examining the background of insulin resistance along
with its link to endothelial function, its measurement and potential aetiology along with its established
link to atheromatous coronary disease. Chapter 2 introduces cardiac 'Syndrome X' by looking, in a
balanced way, at the evidence for ischaemia, as well as the evidence for insulin resistance and
endothelial function in these patients. I postulate that underlying insulin resistance in these patients leads
to general abnormalities of vascular function and therefore reduced vasodilator capacity in the coronary
bed as the substrate for myocardial ischaemia.I performed a study in which women with cardiac 'Syndrome X' were initially compared with a healthy
control group to examine differences in their metabolic measures, anthropometric measures and
peripheral microvascular function. I then went on to perform a randomised double-blinded placebocontrolled trial during which metformin or placebo was administered for 8 weeks to women with cardiac
'Syndrome X'. The recruitment protocol and methods used are described in chapter 3.The differences between women with cardiac 'Syndrome X' and healthy controls are discussed in
chapter 4. I show that after correction for age and body mass index, there exists significant differences
between the groups in terms of indices of insulin resistance, some lipid parameters, some serum markers
of endothelial function and serum leptin.The process of laser Doppler imaging in conjunction with iontophoretically-applied acetyl-choline and
sodium nitroprusside is used to assess peripheral microvascular function, and this is discussed in chapter
5. In particular, the reproducibility of these measurements both between arms, and several weeks apart is
validated. I go on to show that there is a significant difference both in the endothelium-dependent and
independent peripheral microvascular vasodilating response, between women with cardiac 'Syndrome
X' and controls, in chapter 6.I demonstrate in chapter 7 that administration of metformin to women with cardiac 'Syndrome X'
results in significant improvement in some indices of insulin resistance, some lipid measures, some
serum markers of endothelial function and body mass. Furthermore, in chapter 8, improvement in
endothelium-dependent microvascular function and in some ischaemic-measures is shown following
metformin administration. These findings are summarised and discussed in chapter 9