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M M Pedersen

Publications and source records attributed to M M Pedersen.

At least 19 recordsLinked to original sources

The Nordic Trueness Project 2002: use of reference measurement procedure values in a general clinical chemistry survey.

Up to 136 laboratories participated in a joint effort to assess the trueness of routine measurements for 14 serum components. An unmodified, fresh-frozen human serum ("IMEP-17 Material 1"), produced for an international inter-laboratory comparison, served as the "master material". The serum had assigned values of the highest available metrological quality, and is assumed to involve no or negligible commutability problems. The material was used in the assignment of traceable values to two other reference sera, "CAL" and "X", through parallel measurements on the three materials according to a common protocol. In this transfer process, uncertainty estimates were provided for all values. The material CAL had been supplied with reference measurement procedure values in 1997, and the two sets of assigned values agreed well. A lyophilized control serum "HK02" was also included in the routine analysis series. It, too, had assigned values based on reference measurement procedures. Significant matrix effects were found. The project has provided: Assigned traceable values for 14 components in a fresh-frozen serum, available to Nordic laboratories for the coming years as "NFKK reference serum X"; Confirmation of earlier assigned reference measurement procedure values for a number of components in CAL, the main calibrator in the Nordic Reference Interval project (NORIP). The transferred values will now serve as the primary reference.; Evidence of long-term stability ( > or = 5 years) of the fresh-frozen serum CAL when stored at -80 degrees C; Evidence of substantial matrix effects in the processed serum HK02. The findings should be used to discuss to what extent reference measurement procedure values are useful and cost-efficient for this type of material.

Blood Chemical Analysis↗

Minimally processed fresh frozen human reference sera: preparation, testing, and application to international external quality assurance.

The preparation of unmodified or minimally processed fresh frozen human sera is described, as well as the previous use of such sera, e.g. in Nordic and international external quality assurance (EQA) activities. The unmodified serum is prepared from fresh donors' blood collected in dry bags and allowed to coagulate. The serum is collected "on the clot", pooled, filtered, mixed, dispensed in polypropylene vials and frozen at -80 degrees C without further processing. Some batches were slightly modified by spiking or dilution. Critical steps of the production and use of the sera are described and improvements are discussed. A total of 34 different batches have been prepared since 1985. Results from homogeneity and stability studies are presented. The studies cover 18 routine components in serum stored at +4 degrees C to 37 degrees C for up to 34 days. Good stability was observed for storage of all components, with the exception of triglyceride. Amylase, creatininium, glucose, gamma-glutamyltransferase, urate (and perhaps carbamide) showed deterioration after 13 days of incubation at 37 degrees C. The long-term stability at -80 degrees C is reviewed and new data are presented, e.g. as consensus values from EQA schemes, where the same serum has been sent out three times over 5 years, and from reference measurement procedure values that have been assigned twice with an interval of 5 years. Furthermore, a 10-year stability study has been started.

Blood Specimen Collection↗

Night blood pressure and cigarette smoking: disparate association in healthy subjects and diabetic patients.

Cigarette smoking and diabetes are well known risk factors for cardiovascular disease. The relation of nocturnal blood pressure (BP) to cigarette smoking is unclarified. We examined ambulatory BP in 18 healthy smokers matched for sex and age to 18 non-smokers. Sixteen smoking type 1 diabetic patients matching 16 non-smoking patients with normal urinary albumin excretion were also investigated. None of the healthy subjects or diabetic patients had a clinic BP > 160/95 mmHg. Night BP (systolic/diastolic mmHg) in healthy smokers (mean +/- SD) 102 +/- 9/57 +/- 5 was lower than in healthy non-smokers 108 +/- 10/61 +/- 6 (p = 0.06/p < 0.05). The difference between smokers and non-smokers was most prominent in the 3 h period just before rising (99 +/- 9/57 +/- 6 versus 108 +/- 8/62 +/- 7, p < 0.01/p < 0.05). Daytime BP was similar between groups. The night/day ratio (%) of systolic (84 +/- 7) and diastolic (74 +/- 7) BP in healthy smokers was lower than in non-smokers (88 +/- 5 versus 80 +/- 5, p < 0.05 and p < 0.01) indicating an altered diurnal rhythm of blood pressure. No statistical significant difference was found for night or day BP in diabetic smokers versus non-smokers. The finding of a significantly lower BP in healthy (supine) smokers at night speaks against dysautonomia explaining the lower clinic BP found in epidemiological studies, as recently proposed. Alternatively a rebound effect or the existence of a substance with vasodilating properties in non-diabetic smokers is suggested.(ABSTRACT TRUNCATED AT 250 WORDS)

Adolescent↗

Acute renal effects of angiotensin converting enzyme inhibition in microalbuminuric type 1 diabetic patients.

The renal effects of intravenous injection of 10 mg enalapril were investigated in 16 normotensive microalbuminuric type 1 (insulin-dependent) diabetic patients. After enalapril the following changes were observed: fractional albumin clearance (theta Alb) decreased from 9.9 (3.0-23.8) to 8.2 (2.0-18.3) x 10(-6) (2 P < 0.01); filtration fraction (FF) decreased from 0.260 (0.225-0.312) to 0.253 (0.190-0.297) (2 P < 0.01); renal plasma flow (RPF) increased from 565 (411-690) to 623 (449-785) (2 P < 0.01); and glomerular filtration rate (GFR) remained stable at 149 (128-181) versus 150 (124-185) ml.min-1 (NS). These values were unchanged after placebo (n = 8), except for RFP which decreased from 606 (401-701) to 559 (381-677) ml.min-1 (2 P < 0.05) and GFR which was reduced from 148 (111-173) to 138 (111-167) (2 P < 0.05). A reduction in mean blood pressure from 94 (87-103) to 89 (79-101) mmHg (2 P < 0.05) was found in the enalapril group and a minor reduction in the placebo group from 97 (83-106) to 96 (81-104) mmHg (2 P < 0.05) was also noted. The relative changes in systolic blood pressure in the enalapril group correlated with changes in theta Alb (Spearman's r = 0.66, 2 P < 0.02) and FF (r = 0.53, 2 P < 0.05). Acute inhibition of angiotensin converting enzyme does not reduce the pathological hyperfiltration in these patients and a reduction in theta Alb and FF can not be dissociated from the reduction in blood pressure.

Adult↗

Monitoring diabetic nephropathy: glomerular filtration rate and abnormal albuminuria in diabetic renal disease--reproducibility, progression, and efficacy of antihypertensive intervention.

The principal end point in the evaluation of treatment in incipient and overt diabetic nephropathy is rate of decline in glomerular filtration rate (GFR). Therefore, information on reproducibility of GFR measurements is essential in the planning and evaluation of clinical trials. We studied reproducibility of GFR measurements in insulin-dependent and non-insulin-dependent diabetes mellitus patients using, respectively, a constant-infusion technique with urine collection and labeled iothalamate as a tracer marker and a single-shot procedure using Cr-EDTA, measuring the GFR from the decline in plasma level after bolus injection. The coefficient of variance in the insulin-dependent patients was from 7.5% to 8.8% with repeated measurements. In longitudinal studies with several measurements the mean coefficient of variances varied between 7.4% and 3.4%. In the non-insulin-dependent patients the coefficient of variances between two tests were 7.0% and 5.3% for normoalbuminuric and microalbuminuric patients, respectively. In cross-sectional studies as well as in longitudinal studies, it has been consistently shown that GFR is well preserved and at a supranormal level in patients with normoalbuminuria and microalbuminuria. A decline in GFR appears to start around the transition from microalbuminuria to overt diabetic renal disease, although more detailed studies are needed to support this finding. With regard to intervention trials, several studies document that microalbuminuria can be reduced by effective antihypertensive treatment, particularly with angiotensin-converting enzyme inhibitors, also in patients with normal or close to normal blood pressure. Preliminary results from long-term studies suggest that reduction in microalbuminuria in these patients is associated with preservation of GFR and, thus, apparently renoprotection. In patients with overt renal disease, it has been consistently shown that antihypertensive treatment reduces albuminuria as well as the rate of decline in GFR. This is also observed with combined treatment regimens, for instance beta blockers or angiotensin-converting enzyme inhibitors combined with diuretics, or the three types of drugs in combination.

Albuminuria↗

Diurnal blood pressure variations in normoalbuminuric type 1 diabetic patients.

OBJECTIVE: To test the hypothesis that normoalbuminuric type 1 diabetic patients segregate into groups with normal and elevated ambulatory blood pressure. To evaluate diurnal variation of blood pressure assessed by individual or fixed night-time periods. DESIGN: Cross-sectional study. SETTING: Tertiary referral centre. SUBJECTS: Inclusion criteria for type 1 diabetic patients (n = 33): normal urinary albumin excretion (UAE age < 45 < 20 micrograms min-1), diabetes duration < or = 20 years, age 45 years. Healthy controls (n = 33) were matched for sex and age. MAIN OUTCOME MEASURE: Twenty-four hour, day-time, night-time and night/day ratio of ambulatory blood pressure. RESULTS: Twenty-four-hour blood pressure in diabetic patients did not differ significantly from a normal distribution. The 24-h systolic blood pressure was higher in diabetic patients than in healthy controls (difference: 6 mmHg, 95% confidence interval (CI) from 1 to 10 mmHg, P < 0.05), while no significant differences were found for diastolic values. The 24-h systolic blood pressure in diabetic patients with UAE above the median value (5.8 micrograms min-1) was higher than for those with lower UAE (difference: 7 mmHg, 95% CI from 0.5 to 13 mmHg, P < 0.05). The night/day ratio of diastolic blood pressure based on individual informations of the night period was (mean +/- SD) 80 +/- 6% in diabetic patients and 78 +/- 8% in controls (difference: 2%, 95% CI from -1 to 5%, not significant [NS]). This ratio increase significantly (P < 0.00001) to 90 +/- 5% in diabetes and to 84 +/- 7% in controls if a fixed night period from 22.30 hours to 06.30 hours was assumed. CONCLUSIONS: It was not possible to identify a well-separated group of normoalbuminuric type 1 diabetic patients with elevated ambulatory blood pressure. Values of UAE above the median in diabetic patients are associated with higher ambulatory blood pressure. Assessment of the night/day variation from fixed time-points should be abandoned because this leads to a serious underestimation of the nocturnal reduction in blood pressure.

Adolescent↗

Ambulatory blood pressure in microalbuminuric type 1 diabetic patients.

Twenty-four-hour ambulatory blood pressure (AMBP) was performed in microalbuminuric (micro.) type 1 diabetic patients, with the aim of comparison with a matched group of normoalbuminuric patients (normo.) and healthy controls. Thirty-four patients without antihypertensive medication were investigated in each group. Urinary albumin excretion (UAE) for micro. was (geometric mean, tolerance factor microgram/min) 51.7 x/divided by 1.94, 5.1 x/divided by 1.88 for normo. and 5.2 x/divided by 1.75 for controls. Twenty-four-hour AMBP (mean systolic/diastolic mm Hg +/- SD) was significantly higher in micro. (131 +/- 10/78 +/- 7) than in normo. (122 +/- 8/73 +/- 6; P less than 0.001/P less than 0.01). No 24-hour AMBP difference between normo. and controls (120 +/- 9/71 +/- 7) was found. No difference in the night/day ratio of blood pressure was found between the diabetic groups. Coefficient of variation for day time systolic measurements did not show any intergroup difference. Systolic day time blood pressure for the pooled diabetic group correlated significantly with UAE (r = 0.45, P less than 0.001), whereas no significant correlation with auscultatory systolic values in the clinic was found (r = 0.21; P = 0.09). In conclusion, blood pressure in micro. as compared to normo. is not more labile but is elevated day and night without significant alteration of the diurnal rhythm. AMBP reflects the association between UAE and blood pressure more precisely than clinical measurements and may be preferable for identifying candidates for antihypertensive treatment.

Albuminuria↗

Effects of ACE inhibition supplementary to beta blockers and diuretics in early diabetic nephropathy.

Angiotensin converting enzyme (ACE) inhibition has shown promising results in diabetic nephropathy, but long-term results on survival are not available. In a cohort of patients receiving antihypertensive treatment predominantly consisting of beta blockers in combination with diuretics, support for an improved survival has been presented. Addition of ACE inhibition to such a combination treatment may be favorable both due to the suggested renoprotective effects of ACE inhibitors and because diuretics activate the renin-angiotensin system. In 10 insulin-dependent diabetic patients with early diabetic nephropathy [urinary albumin excretion rate (UAE) less than 100o micrograms/min], who were receiving continuous therapy with metoprolol and bendroflumethiazide, a double-blind crossover study with four months addition of ramipril 5 mg (Ramace) and placebo was conducted. UAE (radioimmunoassay) and fractional albumin excretion were significantly reduced after the four months of ramipril administration [UAE: 114.1 x/divided by 1.3 (geometric mean x/divided by confidence factor] versus 174.6 x/divided by 1.2 micrograms/min, 2P less than 0.005). Renal plasma flow (clearance of 131I-hippuran) tended to increase [497 +/- 25 (mean +/- SE) vs. 464 +/- 28 ml/min/1.73 m2, 2P = 0.08], while GFR (125I-iothalamate) stayed unchanged (121 +/- 8 vs. 120 +/- 9 ml/min/1.73 m2). Mean arterial pressure during clearance studies fell moderately (95 +/- 3 vs. 101 +/- 1 mm Hg, 2P less than 0.05) and renal resistance was decreased (2P less than 0.03). ACE activity was suppressed in all patients. Twenty-four-hour ambulatory blood pressure measurements were not significantly different after the two periods (daytime averages: 91 +/- 2 vs. 93 +/- 2, nighttime 80 +/- 2 vs. 84 +/- 3 mm Hg).(ABSTRACT TRUNCATED AT 250 WORDS)

Adrenergic beta-Antagonists↗

Determinants of intra-individual variation in kidney function in normoalbuminuric insulin-dependent diabetic patients: importance of atrial natriuretic peptide and glycaemic control.

1. In order to investigate the modulation of kidney function in insulin-dependent diabetes mellitus, intraindividual variation in glomerular filtration rate, renal plasma flow, urinary albumin excretion rate and mean arterial blood pressure was assessed in 22 normoalbuminuric patients [age 31 +/- 8 years, duration of diabetes 9 +/- 5 years, mean arterial blood pressure 90 +/- 5 mmHg (means +/- SD), urinary albumin excretion rate 5.4 x/divided by 1.6 micrograms/min]. The variation in these parameters was calculated from the results of two clearance studies (continuous infusion of [125I]-iothalamate and 131I-hippuran as markers for glomerular filtration rate and renal plasma flow, respectively) and was subsequently analysed in relation to individual variation in plasma concentrations of atrial natriuretic peptide, arginine vasopressin, angiotensin II and aldosterone and measures of glycaemic control. 2. Simple correlation analysis showed a significant association between intra-individual variation in glomerular filtration rate and atrial natriuretic peptide (sigma = 0.66, P = 0.003). Besides variation in atrial natriuretic peptide, multiple regression analysis identified variation in glycated haemoglobin (P = 0.026) and arginine vasopressin (P = 0.057) as variables having independent association with variation in glomerular filtration rate [R2 with the three variables included (adjusted for degrees of freedom) = 0.50, analysis of variance: P = 0.002]. 3. With respect to variation in renal plasma flow, differences in fasting blood glucose concentration and mean arterial blood pressure were suggested as determinants (R2 = 0.36, analysis of variance: P = 0.009). 4. Variation in urinary albumin excretion rate (after log transformation) was statistically associated with variation in glycated haemoglobin.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗

A randomized comparison of intranasal and injectable octreotide administration in patients with acromegaly.

Fifteen acromegalic patients received four single doses of octreotide in random order (500 micrograms, 1000 micrograms, and 2000 micrograms applied intranasally and 100 micrograms given sc). Serum octreotide and GH data were subjected to pharmacokinetic analyses, and local nasal effects were evaluated by acoustic rhinometry. Average areas (+/- SEM) under the serum octreotide curves were: 2000 micrograms: 4597 +/- 536; 1000 micrograms: 1923 +/- 439; 500 micrograms: 957 +/- 168; and 100 micrograms sc: 896 +/- 81 micrograms.L-1.min (n = 13). The calculated relative availability was 27% +/- 0.03; 22% +/- 0.05; 22% +/- 0.03, respectively, for the three nasal doses. The rate of absorption after intranasally administered octreotide was greater than after sc application: t1/2 ka: 7.1 +/- 1.6; 7.9 +/- 1.6; 11.3 +/- 1.9, respectively, vs. 24.1 +/- 2.5 min, whereas the rates of disappearance were similar. GH suppression started immediately after application and reached minimum levels 1-2 h later. The average intervals during which serum GH was below 50% of preadministration values were: 2000 micrograms: 544 +/- 47; 1000 micrograms: 423 +/- 56; 500 micrograms: 289 +/- 52 vs. 351 +/- 34 min after sc injection of 100 micrograms. With 2000 micrograms intranasally all but one of the 15 patients attained constant suppression of serum GH below 5 micrograms/L for 273 to 680 min. Pharmacokinetic analysis demonstrated that 100 micrograms sc and 1000 micrograms intranasally induced the same GH suppressive effect and that 2000 micrograms intranasally approximately doubled the duration of action. Acoustic rhinometry was performed after nasal application of the largest dose of 2000 micrograms and after carrier (n = 9). A highly significant tumescence of the nasal mucosa was maximal after 10 min and gradually receded over the next 2 h. However, this was felt by the patients to be acceptable. The effect was caused by octreotide per se and was probably due to vasodilation.

Acromegaly↗

Ambulatory blood pressure measurement in type 2 diabetic patients: methodological aspects.

Ambulatory blood pressure was measured over 24 h on two occasions in 29 Type 2 diabetic patients age 65 (range 52-74) years, and the reproducibility compared with that of ordinary clinic measurements recorded by Hawskley's random zero sphygmomanometer. The variability of the difference between blood pressure measurements on the two occasions was twice as large for clinic measurement as for ambulatory measurement (2p less than 0.01). If applied to clinical trials this would allow a fourfold reduction of patient numbers without losing test power. In the group of patients treated with antihypertensive medication (n = 16) the spontaneous decline in blood pressure after leaving the hospital proved to be most prominent in those patients with the highest clinic blood pressure, a phenomenon with importance for the management of hypertension. The individual difference between clinic measurements and ambulatory day-time measurements from the same day was unpredictable. Ambulatory blood pressure measurement in the outpatient clinic may be a practicable approach for optimizing antihypertensive treatment in Type 2 diabetic patients.

Aged↗

Reduction of glomerular hyperfiltration in normoalbuminuric IDDM patients by 6 mo of aldose reductase inhibition.

Hyperglycemia causes enhanced glucose metabolism by the polyol pathway in tissues not requiring insulin for glucose uptake. It has been suggested that the high level of aldose reductase activity may cause functional and structural abnormalities in diabetes and may be involved in the development of late complications. To elucidate the effect of an aldose reductase inhibitor (ponalrestat) on kidney function in uncomplicated insulin-dependent diabetes mellitus (IDDM), 20 normoalbuminuric IDDM patients were randomized to follow either 6 mo of treatment with ponalrestat (n = 11, mean +/- SD age 30 +/- 8 yr, diabetes duration 10 +/- 6 yr) or 6 mo of placebo (age 33 +/- 7 yr, diabetes duration 12 +/- 6 yr). The glomerular filtration rate (clearance of [125I]iothalamate) was significantly reduced from 140 +/- 18 to 129 +/- 10 ml.min-1.1.73 m-2, 2P = 0.02) in the ponalrestat-treated patients, whereas no change was seen after placebo (142 +/- 12 vs. 141 +/- 12 ml.min-1.1.73 m-2). The renal plasma flow (clearance of 131I-labeled hippuran), urinary albumin excretion rate (radioimmunoassay), fractional albumin clearance, and renal vascular resistance were unchanged in both groups. HbA1c showed a modest increase during ponalrestat (7.9 +/- 1.8 vs. 8.7 +/- 1.5%, 2P = 0.01) but was unchanged during placebo. No side effects of ponalrestat were observed. Thus, inhibition of aldose reductase may reduce the characteristic hyperfiltration in uncomplicated IDDM.

Adult↗

Renal factors influencing blood pressure threshold and choice of treatment for hypertension in IDDM.

In this article, we analyze the blood pressure (BP) threshold for the start of antihypertensive treatment in insulin-dependent diabetes mellitus (IDDM) patients, with particular emphasis on those with persistent microalbuminuria or proteinuria (incipient and overt nephropathy, respectively). In such individuals, there is a clear increase in the prevalence of hypertension and in actual measured BP values that is not observed in normoalbuminuric patients. In 94 young healthy adults (less than 45 yr of age), average mean +/- SD arterial pressure (MAP; diastolic + 1/3 pulse pressure) was approximately 90.0 +/- 8.1 mmHg, closely corresponding to large population studies. In microalbuminuric IDDM patients, MAP values between approximately 105 and approximately 95 mmHg have been found in different studies, and the level has progressively decreased in various studies between 1984 and 1990 with similar BP-measuring techniques. Somewhat higher values are seen in patients with proteinuria, who are also consistently characterized by reduced glomerular filtration rate (GFR). A clear correlation is found between MAP plotted against the increased rate of microalbuminuria (%/yr) in incipient nephropathy and against fall rate of GFR (ml.min-1.mo-1) in proteinuric patients. In the natural history of renal disease, different cutoff points in MAP for start of progression are observed: greater than 95 mmHg for the start of progression of microalbuminuria and greater than 105 mmHg for the decrease in GFR. During antihypertensive treatment, there is reduction or no progression in microalbuminuria with MAP of approximately 90-95 mmHg and only a limited fall in GFR with MAP of approximately 100 mmHg. However, certain antihypertensive drugs (angiotensin-converting enzyme inhibitors) may have specific renoprotective actions, reducing microalbuminuria at rather low BP levels or even independent of BP reduction. The optimal way of monitoring BP may be by 24-h ambulatory recording.

Blood Pressure↗

ACE-inhibition and renoprotection in early diabetic nephropathy. Response to enalapril acutely and in long-term combination with conventional antihypertensive treatment.

Early antihypertensive treatment with beta1 blockers and diuretics has proved to delay progression in diabetic nephropathy. Application of angiotensin converting enzyme inhibitors (ACE-I) may also be relevant. To elucidate possible differences in acute renal response to ACE-I and beta-blockers, kidney function was investigated before and after enalaprilat (10 mg) and metoprolol (10 mg) i.v. in 8 microalbuminuric insulin-dependent diabetic patients on no antihypertensive therapy (Study A). Glomerular filtration rate (clearance of 125I-iothalamate) was unchanged with both agents. ACE-I gave rise to efferent renal vasodilation: renal resistance and filtration fraction fell, renal plasma flow (RPF; 131I-hippuran) tended to rise (2p = 0.07) and blood pressure and urinary albumin excretion rate (UAE; radioimmunoassay) were reduced. In contrast, metoprolol caused a decline in RPF, an increase in renal resistance and filtration fraction, and no change in blood pressure or UAE. In 10 diabetic, nephropathic patients undergoing treatment with metoprolol and thiazide (Study B), the acute response to enalaprilat corresponded closely to that observed in Study A, including a decrease in UAE and blood pressure. Over 6 months the addition of enalapril (20 mg/d) to metoprolol and thiazide produced a more pronounced UAE-reduction, although no significant decrease in blood pressure was observed. The present findings support that ACE-I may process specific renoprotective effects. A combination therapy with beta1 blockers, ACE-I, and diuretics is suggested.

Adult↗

Effects of felodipine on urinary albumin excretion and metabolic control in hypertensive non-insulin-dependent diabetics.

The effect of a blood pressure reduction by 10 mg extended release felodipine once daily on urinary albumin excretion (UAE) as well as the possible diabetogenic effect of felodipine was studied. A 2 X 12 week placebo-controlled double-blind crossover study was performed in 12 hypertensive non-insulin-dependent diabetic (NIDDM) patients without nephropathy on concomitant treatment with beta-blocker and/or a diuretic agent. Metabolic control as estimated by fasting plasma glucose, hemoglobin A1c and fasting plasma C-peptide was unaltered after felodipine. Blood pressure was significantly reduced by felodipine: systolic 166 +/- 26 mm Hg (placebo) v 153 +/- 26 mm Hg (felodipine) (P less than .05) and diastolic 95 +/- 7 mm Hg v 90 +/- 8 mm Hg (P less than .05). Heart rate was unchanged. There was no correlation between blood pressure and UAE, but the relative change in UAE expressed as UAE placebo/UAE felodipine was significantly correlated to the fall in systolic blood pressure (r = 0.64, P = .03) and mean blood pressure (r = 0.66, P = .02). Since microalbuminuria predicts proteinuria and reduced survival, early antihypertensive treatment may be beneficial in NIDDM as it is in IDDM. Long-term consequences on kidney function and mortality remains, however, to be elucidated.

Aged↗