Harmful alcohol use among acutely ill hospitalized medical patients in Oslo and Moscow: A cross-sectional study.

BACKGROUND: The aim was to estimate the prevalence of harmful alcohol use in relation to socio-demographic characteristics among acutely ill medical patients, and examine identification measures of alcohol use, including the alcohol biomarker phosphatidylethanol 16:0/18:1 (PEth). METHODS: A cross-sectional study, lasting one year at one hospital in Oslo, Norway and one in Moscow, Russia recruiting acute medically ill patients (≥ 18 years), able to give informed consent. Self-reported data on socio-demographics, mental distress (Symptom Check List-5), alcohol use (Alcohol Use Disorder Identification Test-4 (AUDIT-4) and alcohol consumption past 24 h were collected. PEth and alcohol concentration were measured in whole blood. RESULTS: Of 5883 participating patients, 19.2% in Moscow and 21.1% in Oslo were harmful alcohol users, measured by AUDIT-4, while the prevalence of PEth-positive patients was lower: 11.4% in Oslo, 14.3% in Moscow. Men in Moscow were more likely to be harmful users by AUDIT-4 and PEth compared to men in Oslo, except of those being ≥ 71 years. Women in Oslo were more likely to be harmful users compared to those in Moscow by AUDIT-4, but not by PEth for those aged < 61 years. CONCLUSIONS: The prevalence of harmful alcohol use was high at both study sites. The prevalence of harmful alcohol use was lower when assessed by PEth compared to AUDIT-4. Thus, self-reporting was the most sensitive measure in revealing harmful alcohol use among all groups except for women in Moscow. Hence, screening and identification with objective biomarkers and self-reporting might be a method for early intervention.

Secretion of lecithin: cholesterol acyltransferase from isolated rat hepatocytes.

1. Lecithin:cholesterol acyltransferase is secreted from isolated rat heptocytes. 2. The secretion is stimulated when serum is added to the incubation medium. 3. Optimal conditions for secretion are: 5-10(6) hepatocytes per ml, 5 h incubation, pH 7.3-7.4 and 25% serum in the incubation medium. 4. Concomitantly with the secretion of lecithin:cholesterol acyltransferase there is a secretion of unesterified cholesterol and triacylglycerol. 5. Colchicine or cycloheximide in the incubation medium inhibits secretion of lecithin:cholesterol acyltransferase.

The glucose clamp procedure activates the sympathetic nervous system even in the absence of hyperinsulinemia.

There is a well established connection between hyperinsulinemia and hypertension, and activation of the sympathetic nervous system (SNS) by insulin has been proposed as one mechanism. In short term infusion studies, hyperinsulinemia during the euglycemic glucose clamp examination is associated with increased norepinephrine concentration. However, many of the studies lack sufficient control groups. The euglycemic glucose clamp examination could possibly, by discomfort from iv cannulas, the use of heating cuffs, and prolonged immobilization, by itself increase SNS activity. To examine this, we included nine controls, who had saline instead of glucose and insulin infused iv, among other healthy young men (n = 50) who underwent the euglycemic hyperinsulinemic glucose clamp. During hyperinsulinemic clamp, the plasma norepinephrine concentration increased from 0.87 +/- 0.06 to 1.06 +/- 0.05 nmol/L; in the control study, it increased from 0.99 +/- 0.14 to 1.21 +/- 0.11 nmol/L, a significant treatment effect (P < 0.001, by repeated measures analysis of variance), but no group x treatment effect (P = 0.17), i.e. there was no difference between the groups. There were no significant changes in systolic or diastolic blood pressure, heart rate, or plasma epinephrine concentration during the clamps, nor any differences between the groups. We conclude that the increase in plasma norepinephrine concentration observed during an euglycemic glucose clamp examination may be attributed to the procedure itself, and that the inclusion of a control group is mandatory when assessing SNS activity.

Relationship between insulin sensitivity and maximal forearm blood flow in young men.

Insulin resistance is a part of the metabolic cardiovascular syndrome. We aimed to test the hemodynamic hypothesis of insulin resistance, which suggests that a decreased skeletal muscle blood supply with subsequent reduced nutritional flow causes insulin resistance in skeletal muscle. We assessed determinants of peripheral blood flow such as maximal forearm blood flow (MFBF), minimal forearm vascular resistance (MFVR), and whole blood viscosity (WBV) in 27 young men with borderline elevation of blood pressure. Insulin sensitivity measured as glucose disposal rate (GDR) correlated with MFBF (r=0.55, P=0.003), MFVR (r=-0.58, P=0. 002), and WBV (r=-0.39, P=0.046 at shear rate 201 s-1). There was no correlation between GDR and myocardial thickness or left ventricular mass. In a stepwise multiple regression analysis, MFVR and WBV explained 54% of the variation in GDR. The relative increase in mean arterial blood pressure during a mental stress test, as a marker of reactivity or an alert reaction, was correlated with MFVR (r=0.56, P=0.002) and inversely with GDR (r=-0.45, P=0.018) and MFBF (r=-0.49, P=0.01) but not with cardiac dimensions. In a stepwise multiple regression analysis, 48% of the increase in blood pressure during a mental stress test was explained by MFVR and WBV. Fasting insulin correlated with MFVR (r=0.41, P=0.036) and GDR (r=-0.62, P=0.001). These data show a positive association between the appearance of peripheral structural vascular changes as quantified through a hemodynamic technique and insulin resistance in young men with borderline elevation of blood pressure. The cause-effect relationship of this finding needs further evaluations.

Insulin sensitivity, sympathetic activity, and cardiovascular reactivity in young men.

The present study was undertaken to examine the relationships between insulin sensitivity, blood pressure (BP), and cardiovascular reactivity, and to assess sympathetic nervous system influence. Insulin sensitivity (GDR/I; euglycemic glucose clamp technique) was related to BP and heart rate (HR) in different situations in 40 healthy young men: in the laboratory, during a mental arithmetic stress test, and during baseline conditions at home. GDR/I correlated with supine diastolic BP in the laboratory and with maximum diastolic BP during mental stress (r = -0.46, P = .003; r = -0.62, P = .0001, respectively), but not so strongly with diastolic BP measured at home (r = -0.29, P = .09). Diastolic BP during stress and body mass index were the only independent explanatory variables of GDR/I in multiple regression analysis (multiple R = 0.71, R2 = 0.50, P < .0001). GDR/I and systolic BP were not significantly correlated at any time. GDR/I correlated negatively with HR in the laboratory and with maximum HR during mental stress, but not with HR at home. Maximum plasma epinephrine during stress correlated with stress BP and HR (r = 0.53, P = .001; r = 0.70, P < .0001, respectively) and negatively with GDR/I (r = -0.36, P < .05). In the present study, GDR/I is related to diastolic but not to systolic BP, and more closely correlated to diastolic BP and HR measured during mental stress than to diastolic BP and HR during baseline conditions at home.(ABSTRACT TRUNCATED AT 250 WORDS)

Relationship between hemorheological factors and insulin sensitivity in normotensive and hypertensive premenopausal women.

The present study aimed at testing a possible relationship between hemorheologic factors such as hematocrit and whole blood viscosity, and insulin sensitivity in premenopausal, hypertensive (HT), and normotensive (NT) women. Fourteen HT and 12 NT women were studied with the hyperinsulinemic euglycemic glucose clamp technique. Insulin sensitivity was similar in NT and HT (8.7 +/- 0.8 v 7.6 +/- 0.8 arbitrary units). Whole blood viscosity did not differ between the two groups at any shear rate (shear rate 5.2 sec-1: 7.5 +/- 0.4 in NT and 8.0 +/- 0.3 in HT, P = NS). Statistically significant negative correlations were observed between the insulin sensitivity index and calculated whole blood viscosity at both high (r = -0.49, P < .01) and low shear rates (r = -0.50, P < .01, n = 26). Insulin sensitivity index was also negatively correlated to body mass index in the combined groups (r = -0.40, P = .04), and to both systolic and diastolic blood pressure (r = -0.44, P = .02 and r = -0.38, P = .05, respectively). In multiple regression analysis, whole blood viscosity, body mass index, systolic, and diastolic blood pressure accounted for 39% of the variation in insulin sensitivity index, but only whole blood viscosity was an independent explanatory variable for the insulin sensitivity index. These results suggest hemorheologic, and therefore indirectly hemodynamic factors as correlates to insulin sensitivity.

Mild essential hypertension in nonobese premenopausal women is characterized by low renin.

The pathophysiological mechanisms in hypertension may differ in men and women. Plasma renin activity was measured in 27 premenopausal, never-treated hypertensive women (blood pressure 141 +/- 2/93 +/- 1 mm Hg) and in 18 age-matched normotensive women (blood pressure 113 +/- 2/71 +/- 2 mm Hg). All subjects were unaware of their blood pressure status. The hypertensive women had on average lower plasma renin activity (0.21 +/- 0.03 nmol/L/h) than their normotensive controls (0.42 +/- 0.07 nmol/L/h, P less than .01). Serum estradiol was also lower in the hypertensive women (0.57 +/- 0.06 v 0.81 +/- 0.09 nmol/L, P less than .05). No difference in epinephrine, norepinephrine, atrial natriuretic peptide, or vasopressin was found between the groups. Plasma renin activity was positively correlated to plasma norepinephrine in the hypertensive women only (r = 0.41, P less than .05). Since low renin hypertension is associated with less cardiovascular complications, this may offer an explanation for the better prognosis of hypertension in women.

Relationship between hemorrheologic factors and insulin sensitivity in healthy young men.

The present study aimed at testing a possible relationship between hemorrheologic factors, such as hematocrit, fibrinogen, and whole-blood viscosity, and insulin sensitivity in healthy humans. Twenty-one 21-year-old men were studied with the hyperinsulinemic euglycemic glucose clamp technique. We found statistically significant negative correlations between the glucose disposal rate (GDR) and calculated whole-blood viscosity at both high (r = -.55, P = .01) and low (r = -.51, P = .01) shear rates. We observed negative associations between GDR and fibrinogen (r = -.66, P = .002), GDR and hematocrit (r = -.63, P = .002), GDR and body mass index (r = -.51, P = .007), and GDR and resting heart rate (r = -.46, P = .04). Using stepwise multiple regression considering whole-blood viscosity, body mass index, mean arterial blood pressure, and heart rate as independent variables, we found that only whole-blood viscosity and body mass index were independent explanatory variables of the GDR. Together they accounted for 63% of the variability in the GDR in our subjects. These results suggest hemorrheologic, and therefore indirectly hemodynamic, factors as correlates to insulin sensitivity.

Mental stress increases glucose uptake during hyperinsulinemia: associations with sympathetic and cardiovascular responsiveness.

Infusion of epinephrine and norepinephrine reduces insulin-mediated glucose disposal, ie, induces insulin resistance. Mental stress increases concentrations of both plasma catecholamines. However, the effect of acute mental stress on insulin-mediated glucose uptake has not been examined. We observed in pilot studies that a mental stress test (MST) during a euglycemic glucose clamp decreased blood glucose concentration. In a prospective study, euglycemic hyperinsulinemia was established during 120 minutes of glucose clamping; the subjects (N = 74) then underwent 5 minutes of intense mental arithmetics with infusion rates of glucose and insulin kept constant. During MST, plasma epinephrine and norepinephrine increased (by 0.23 +/- 0.02 and 0.50 +/- 0.05 nmol/L) together with blood pressure ([BP] by 18 +/- 8/9 +/- 1 mm Hg) and heart rate ([HR] by 21 +/- 1 beats per minute), with P less than .0001 for all changes. During mental stress, blood glucose concentration decreased by 0.4 +/- 0.1 mmol/L (P < .0001), followed by full recovery after another 10 minutes. Serum insulin was unchanged, indicating an acute but transient increase in glucose uptake. This finding was unrelated to age, sex, body mass, and BP status. Fifty-nine subjects with a decrease in glucose concentrations during MST were characterized by accentuated epinephrine response to MST (a change of 0.25 +/- 0.03 v 0.12 +/- 0.02 nmol/L, P = .001), increase in systolic BP (by 20 +/- 2 v 10 +/- 3 mm Hg, P = .008), and increase in HR (by 23 +/- 2 v 15 +/- 2 beats per minute, P = .008) as compared with 15 subjects with unchanged/increased glucose concentration.(ABSTRACT TRUNCATED AT 250 WORDS)

Effects of losartan on insulin sensitivity in severe hypertension: connections through sympathetic nervous system activity?

Angiotensin II (Ang II) is one of the most potent vasoconstrictors, and the first specific and orally available Ang II-receptor antagonist, losartan (MK-954, DuP-753), has now come into clinical use. The primary site of insulin resistance, as measured by the glucose clamp technique, is skeletal muscle. Losartan specifically blocks Ang II-induced vasoconstriction, namely causes vasodilation, and may thus increase glucose delivery to skeletal muscle. We used the euglycaemic hyper-insulinaemic glucose clamp technique to assess insulin sensitivity (glucose disposal rate, GDR) or insulin (I) sensitivity index (GDR/I). In 21-year-old men we found negative correlations between GDR/I and blood viscosity (r = -0.69), haematocrit (r = -0.65), fibrinogen (r = -0.50), cholesterol/HDL ratio (r = -0.45), triglycerides (r = -0.46), body mass index (r = -0.64), waist/hip ratio (r = -0.57), resting heart rate (r = -0.46) and diastolic blood pressure (DBP) (r = -0.43), and with DBP (r = -0.62) and plasma adrenaline (r = -0.36) during mental arithmetic stress. In the Losartan Severe Hypertension Study five patients with a record of DBP > or = 115 mm Hg were examined before and on losartan monotherapy for an average of 6 weeks. GDR increased 27% and plasma noradrenaline decreased 40% (P < 0.05 for both) during treatment with losartan. Calculated whole blood viscosity decreased on losartan (P = 0.04) and the changes in GDR correlated with the changes in viscosity (r = 0.89). These results suggest that losartan, possibly by a sympathicolytic effect, lowers blood viscosity, causes vasodilation, and improves insulin sensitivity in essential hypertension.

Prevention of hemodialysis associated hypoxemia by use of low-concentration bicarbonate dialysate.

Hypoxemia during acetate dialysis is caused by hypoventilation due to bicarbonate loss across the dialyzer and its regeneration from acetate by a CO2 consuming process. Loss of bicarbonate is prevented by using a bicarbonate containing dialysate, but hypoxemia is still found by many authors. In the current study, ten patients were dialyzed twice against acetate dialysate, high concentration bicarbonate (36 mmol/L), and low concentration bicarbonate (29 mmol/L) dialysates. A significant decrease in PO2 was found during both acetate and high concentration bicarbonate dialysis. Hypoxemia was prevented by low concentration bicarbonate dialysate. A possible explanation for the hypoxemia in high concentration bicarbonate dialysis may be hypoventilation induced by alkalosis. It was concluded that low concentration bicarbonate dialysate prevents hypoxemia during hemodialysis.

Aspects of the role of lecithin:cholesterol acyltransferase in metabolism of triglycerides.

An increased TG secretion from the liver may lead to an increased secretion of LCAT. Studies on isolated rat hepatocytes have shown: 1. Oleic acid added to the medium stimulates TG and LCAT secretion in a similar way. 2. Cycloheximide, colchicine, 4-amino-pyrazolopyrimidine, and D-galactosamine depress the secretion of both TG and LCAT. 3. There is a positive linear correlation between TG and LCAT secretion in cell preparations from rats operated on with ventromedial hypothalamic lesions. Treatment of rats with orotic acid resulted in maintained plasma LCAT activity despite very low TG concentration. This indicates that LCAT secretion is not dependent upon an intact TG secretion.

Hypertension and the metabolic cardiovascular syndrome: special reference to premenopausal women.

It has been proposed that hyperinsulinemia may not constitute a cardiovascular risk in women, and that the metabolic risk profile is less apparent in women than in men. In two different studies, we have assessed the interrelationship between classical coronary risk factors in women with untreated essential hypertension and looked for possible hypertensive-normotensive differences. Hypertensive women (HT1, 156 +/- 2/98 +/- 1 mm Hg, n = 18) in study I turned out to be overweight and had nearly three times higher fasting serum insulin levels than the normotensive control subjects (NT1, 118 +/- 3/77 +/- 2 mm Hg, n = 9). HT1 women with a body mass index (BMI) above 25 kg/m2 had significant higher insulin levels than HT1 women with a BMI less than 25 kg/m2, and when adjusting for BMI the hypertensive-normotensive difference in insulin levels was lost. In HT1 women, the serum insulin level correlated positively to the BMI and triglycerides. In study II, insulin was positively associated with the systolic blood pressure in HTII women (150 +/- 3/99 +/- 1 mm Hg, n = 29), and a negative correlation appeared between the glucose/insulin ratio and the systolic as well as diastolic blood pressure. No difference was observed in BMI and insulin between HTII and NTII women (121 +/- 3/79 +/- 1 mm Hg, n = 18). In HTII women, plasminogen activator inhibitor (PAI-1) levels were higher and the euglobulin clot lysis time prolonged compared to NTII women. PAI-1 was positively correlated to insulin and triglycerides and negatively to high-density lipoprotein (HDL) cholesterol in HTII women. Strong associations between potential cardiovascular risk factors seem to be present even in untreated women with mild hypertension, with insulin being correlated to hypertension, BMI, fibrinolytic activity, triglycerides, and HDL cholesterol.

Influence of 4-aminopyrazolopyrimidine on morphology, synthesis of triglyceride and protein and their secretion in rat hepatocytes.

The influence of 4-aminopyrazolopyrimidine (4-APP) on morphology and on synthesis and secretion ability of isolated rat hepatocytes was investigated: 4-APP was found to inhibit both the synthesis and secretion of proteins. The synthesis of triglycerides was unaffected by 4-APP, while the secretion of triglycerides was markedly reduced. Transmission electron microscopy revealed that 4-APP induced morphological changes in the smooth membrane systems, the smooth endoplasmic reticulum and the Golgi apparatus. The possibility that 4-APP inhibits lipoprotein formation by inhibition of the apoprotein synthesis is discussed.

[Hypertension as a part of metabolic cardiovascular syndrome]. / Hypertensjon som del av et metabolsk kardiovaskulaert syndrom.

Hypertension is only one of several cardiovascular risk factors that tend to cluster. Hypertension is associated with glucose intolerance, hyperinsulinemia, decreased HDL-cholesterol, high triglycerides and decreased fibrinolytic activity. One possible link is insulin resistance, which also links hypertension to obesity and diabetes mellitus type II. The authors review the literature and discuss clinical and therapeutic implications in the treatment of hypertension. Since the hypertensive patient may have an unfavourable cardiovascular risk profile, a non-pharmacological approach is essential in the treatment. Furthermore, if antihypertensive agents have to be used, metabolic side effects should be monitored closely, since they may reduce the beneficial effects of the blood pressure reduction on the cardiovascular risk profile.

Substrate specificity of lecithin:cholesterol acyltransferase. Esterification of desmosterol, b-sitosterol, and cholecalciferol in human plasma.

Desmosterol and beta-sitosterol were esterified when incubated with normal human plasma. The initial rate of demosterol esterification was 1.7 times faster, and that of beta-sitosterol 0.4 times slower, than the esterification rate of cholesterol. These ratios were found to be almost the same when plasma from different normal individuals was tested. Plasma from a patient with familial lecithin:cholesterol acyltransferase deficiency did not esterify any of the sterols. The esterification of desmosterol and beta-sitosterol was considerably slower in normal plasma in which in vitro cholesterol esterification previously had taken place. The different esterification rates could not be explained by a different affinity of the plasma lipoproteins for the sterols tested. Cholecalciferol added to normal plasma did not become esterified.

Efficient computer subroutines for interconversion of oxygen tension and saturation.

Two digital computer subroutines are described. NORSAT computes human hemoglobin saturation from oxygen tension data; NORINV performs the inverse computation. Each subroutine is based on an algorithm that is a direct mathematical inverse of the other. The effects of nonstandard conditions of temperature, pH, and CO2 tension on the saturation curve can be computed. The relative efficiency of these subroutines is compared to that of published subroutines having similar function. The new subroutines use computer time more efficiently with no loss of accuracy. The subroutines are provided in FORTRAN in a form suitable for direct inclusion in a number of user-specified programs.

Evidence of decreased fibrinolytic activity in hypertensive premenopausal women.

In 29 lean, premenopausal, never-treated hypertensive women (142 +/- 2/93 +/- 1 mmHg, mean +/- SEM) plasminogen activator inhibitor (PAI-1) was elevated (11.0 +/- 1.5 U/ml vs 6.3 +/- 1.0 U/ml, p less than 0.05) compared to healthy, normotensive women (113 +/- 2/71 +/- 2 mmHg). Euglobulin clot lysis time tended to be longer in the hypertensive than in the normotensive women (p = 0.06). PAI-1 was positively correlated to triglycerides (r = 0.60, p less than 0.001), haematocrit (r = 0.45, p less than 0.05), insulin (r = 0.38, p less than 0.05) and body mass index (r = 0.38, p less than 0.05), and inversely correlated to HDL cholesterol (r = -0.43, p less than 0.05) in the hypertensive women. Fibrinogen was not significantly different in the hypertensive and normotensive women, while the hypertensive smokers had higher fibrinogen than the hypertensive non-smokers (3.01 +/- 0.17 g/l vs 2.54 +/- 0.10 g/l, p less than 0.05). All participants were investigated in the same phase of the menstrual cycle. Despite that, oestradiol was significantly lower in the hypertensive than in the normotensive women (0.57 +/- 0.06 vs 0.81 +/- 0.09 nmol l-1, p less than 0.05), while progesterone was similar in the two groups. These results suggest that premenopausal, never-treated hypertensive women are characterized by low oestradiol levels as well as decreased fibrinolytic activity. PAI-1 seems to be associated with other risk factors for cardiovascular disease in hypertensive women.