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Titolo:
PRESERVED RELATIVE DISPERSION BUT BLUNTED STIMULATION OF MEAN FLOW, ABSOLUTE DISPERSION, AND BLOOD-VOLUME BY INSULIN IN SKELETAL-MUSCLE OF PATIENTS WITH ESSENTIAL-HYPERTENSION
Autore:
LAINE H; KNUUTI MJ; RUOTSALAINEN U; UTRIAINEN T; OIKONEN V; RAITAKARI M; LUOTOLAHTI M; KIRVELA O; VICINI P; COBELLI C; NUUTILA P; YKIJARVINEN H;
Indirizzi:
UNIV TURKU,DEPT MED,KIINAMYLLYNK 4-8 FIN-20520 TURKU FINLAND UNIV TURKU,TURKU PET CTR SF-20500 TURKU FINLAND UNIV TURKU,DEPT CLIN PHYSIOL SF-20500 TURKU FINLAND UNIV TURKU,DEPT CLIN CHEM SF-20500 TURKU FINLAND UNIV TURKU,DEPT ANESTHESIOL SF-20500 TURKU FINLAND UNIV PADUA,DEPT ELECT & INFORMAT PADUA ITALY UNIV HELSINKI,DEPT MED,DIV ENDOCRINOL & DIABETOL HELSINKI FINLAND
Titolo Testata:
Circulation
fascicolo: 21, volume: 97, anno: 1998,
pagine: 2146 - 2153
SICI:
0009-7322(1998)97:21<2146:PRDBBS>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
POSITRON EMISSION TOMOGRAPHY; SYMPATHETIC-NERVE ACTIVITY; NITRIC-OXIDE RELEASE; NORMOTENSIVE SUBJECTS; INDUCED VASODILATION; HUMAN FOREARM; GLUCOSE; HETEROGENEITY; RESISTANCE; PERFUSION;
Keywords:
BLOOD PRESSURE; INSULIN; GLUCOSE; TOMOGRAPHY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
61
Recensione:
Indirizzi per estratti:
Citazione:
H. Laine et al., "PRESERVED RELATIVE DISPERSION BUT BLUNTED STIMULATION OF MEAN FLOW, ABSOLUTE DISPERSION, AND BLOOD-VOLUME BY INSULIN IN SKELETAL-MUSCLE OF PATIENTS WITH ESSENTIAL-HYPERTENSION", Circulation, 97(21), 1998, pp. 2146-2153

Abstract

Background-We examined the integrity of the effects of insulin on mean muscle blood flow, flow heterogeneity, and blood volume in essentialhypertension. Methods and Results-Positron emission tomography, combined with [O-15]H2O and [O-15]CO as tracers for direct measurement of blood flow and volume in skeletal muscle, and a new bayesian iterative reconstruction algorithm allowing pixel-by-pixel quantitation of bloodflow and flow dispersion, were used. Measurements were performed basally after an overnight fast and under normoglycemic hyperinsulinemic conditions in 11 newly diagnosed, untreated mildly hypertensive men (age, 35+/-1 years; body mass index, 25.2+/-0.4 kg/m(2), blood pressure 141+/-4/96+/-2 mm Hg, mean+/-SE and 11 matched normotensive men. Insulin-stimulated whole body glucose uptake was significantly decreased in the hypertensive men (41+/-4 mu mol/kg per minute) compared with the normotensive (59+/-4 mu mol/kg per minute, P<0.005) men. Mean blood flow in skeletal muscle was significantly lower in the hypertensive than the normal subjects basally (1.7+/-0.2 versus 2.7+/-0.4 mL/0.1 kg per minute, P<0.05) and during hyperinsulinemia (2.3+/-0.2 versus 4.2+/-0.8, P<0.05). The flow response to insulin (0.6+/-0.2 versus 1.9+/-0.5 mL/0.1 kg per minute, hypertensive versus normal subjects, P<0.05) was also significantly blunted. Muscle blood volume was significantly lower in the hypertensive than in the normal subjects, both basally (3.0+/-0.2 versus 3.5+/-0.2 mL/0.1 kg, P<0.05) and during hyperinsulinemia (3.1+/-0.2 versus 4.0+/-0.2 mL/0.1 kg muscle, P<0.02). The increase in muscle blood volume by insulin was significant in the normal (P<0.05) but not the hypertensive subjects. Regional pixel-by-pixel analysis within femoral muscles revealed significant spatial heterogeneity of blood flow. Insulin increased absolute dispersion of blood flow significantly more in the normal subjects than in the hypertensive subjects (P<0.05). Conclusions-True flow heterogeneity, as judged from the coefficients of variation (relative dispersion), was comparable between the groups basally and during hyperinsulinemia. We conclude that mean flow,its absolute dispersion, and blood volume exhibit insulin resistance in patients with essential hyper-tension.

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Documento generato il 21/01/20 alle ore 00:59:27