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proteinuria obesity

1Division of Nephrology, Lenox Hill Hospital, Northwell Well being, New York, NY, United States

1Division of Nephrology, Lenox Hill Hospital, Northwell Well being, New York, NY, United States

2Division of Biostatistics, Lenox Hill Hospital, Northwell Well being, New York, NY, United States

1Division of Nephrology, Lenox Hill Hospital, Northwell Well being, New York, NY, United States

1Division of Nephrology, Lenox Hill Hospital, Northwell Well being, New York, NY, United States





Weight problems has been more and more acknowledged as a danger issue for kidney illness (1, 2). Elevated physique mass index (BMI) has been linked to glomerular hyperfiltration (3). Each proteinuria and microalbuminuria have been related to weight problems (2). Pathologic modifications within the kidney embody the event of focal segmental glomerulosclerosis and glomerulomegaly (4). Proteinuria has been proven to enhance with a weight reduction in a variety of sequence (1, 5). Elevated BMI has been linked to a lack of renal operate in addition to elevated danger of finish stage renal illness (1, 2). Regardless of all of this proof, the precise prevalence of microalbuminuria and proteinuria in overweight sufferers in america (US) has not been clearly described within the literature. Moreover, weight problems is related to danger components for the event of kidney illness, comparable to diabetes and hypertension (HTN), and the prevalence of proteinuria and albuminuria with out these danger components will not be sure. On this examine, we collected urine albumin/creatinine and urine protein/creatinine ratios on overweight sufferers present process bariatric surgical procedure to find out the prevalence of albuminuria and proteinuria in an overweight inhabitants. We additionally needed to judge how the prevalence modified based mostly on the presence or absence of related diabetes and HTN, with a view to assess the relative significance of those components in overweight sufferers, in contributing to proteinuria and albuminuria.


Materials and Strategies

Consecutive sufferers present process bariatric surgical procedure at a single hospital in New York Metropolis have been recruited. Urine samples have been collected from every affected person previous to surgical procedure and despatched for urine albumin/creatinine and urine protein/creatinine ratios with a view to assess for each total urine protein excretion in addition to extra particularly albuminuria. Albuminuria was outlined as an albumin to creatinine ratio of greater than 30 mg per gram of creatinine and proteinuria as a protein to creatinine ratio of higher than 150 mg per gram of creatinine. Sufferers with proof of a urinary tract an infection or energetic urinary sediment have been excluded. All sufferers had BMI calculated preoperatively. Charts have been reviewed for related diagnoses together with diabetes and HTN in addition to ACE inhibitor or angiotensin receptor blocker (ARB) use.

For evaluation of danger components, sufferers have been divided into three teams: (1) diabetics with and with out HTN (DM), (2) hypertensives with out diabetes (HTN), and (3) these with neither. There have been too few diabetics with out HTN to research individually. We didn’t have knowledge on different diagnoses comparable to glomerulonephritis or lupus that would have contributed to renal illness, however sufferers with proof of energetic urinary sediment have been excluded.

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The examine included 218 sufferers. 2 hundred fourteen sufferers had measurement of urine protein/creatinine and 183 sufferers had urine albumin/creatinine measured. The imply age was 42.1 ± 11.3 years. The imply BMI was 43.9 ± 8.1. Diabetes was current in 25%. HTN was current in 47% of all sufferers. Using ACE inhibitor/ARB was 26.2% total in our inhabitants and was current in 38.5 and 46.2% in sufferers with proteinuria and albuminuria respectively. Baseline traits for all sufferers and for every affected person group are proven in Desk ​Table1.1. Diabetics have been barely older and had extra frequent use of ACEI/ARB than the opposite teams. The BMI for diabetics didn’t differ from non-diabetics.

The prevalence of proteinuria and albuminuria total was 21% (95% CI: 15.8–27.1%) and 19.7% (95% CI: 14.2–26.2%), respectively. Amongst sufferers with proteinuria, the median quantity was 223 mg (IQR: 183–357). Of these with albuminuria, the median urine albumin was 83 mg (IQR: 55–203). Of sufferers with albuminuria, 80.6% had microalbuminuria alone, and 19.4% had macroalbuminuria. Of the sufferers with proteinuria, 40% had DM as did 48.6% of the sufferers with albuminuria.

In analyzing the three affected person teams, amongst DM sufferers (with or with out HTN), 33.3% (95% CI: 21.1–47.5) had proteinuria and 41.5% (95% CI: 26.3–57.9) had albuminuria. Amongst these with out DM however who had HTN, 22.6% (95% CI: 12.9–35) had proteinuria and 17.7% (95% CI 8.4–30.9) had albuminuria. Of sufferers with neither DM nor HTN, 13.3 (95% CI: 7.3–21.6%) and 11.0% (95% CI: 4.9–18.9%) had proteinuria and albuminuria, respectively. The odds of proteinuria and albuminuria in every affected person group are proven in Desk ​Table2.2. Diabetics had a considerably increased prevalence of albuminuria than non-diabetics with HTN (p = 0.012†) and non-diabetics with no HTN (p < 0.0001†). Diabetics had a considerably increased prevalence of proteinuria than non-diabetics with no HTN (p = 0.003†) however the elevated prevalence didn't attain statistical significance in comparison with non-diabetics with HTN (0.20). The non-diabetic teams didn't differ considerably from one another when it comes to prevalence of proteinuria and albuminuria. DM sufferers as a bunch had increased median quantities of proteinuria and albuminuria than the group with out diabetes and with out HTN. Nonetheless, on submit hoc evaluation, there was not sufficient proof to conclude that they differed from the median quantity present in non-diabetics with HTN. The BMI didn't considerably differ between these with and with out proteinuria or albuminuria (p = 0.74 and p = 0.64, respectively). Multivariable evaluation confirmed that, amongst all included components (DM, age, HTN, and ACE inhibitor/ARB use), DM was the one vital issue for proteinuria (p = 0.0001) and albuminuria (p = 0.0001).  

Dialogue – “proteinuria obesity”

Weight problems has been more and more acknowledged as a danger issue for renal illness however the precise prevalence of albuminuria and proteinuria, particularly accounting for related danger components, will not be clear. Two research from France have been revealed within the Nineties that did report on prevalence of albuminuria in obese and overweight sufferers. One examine discovered a prevalence of seven.1% of microalbuminuria and a pair of.7% of macroalbuminuria in sufferers with out diabetes or HTN (6). The opposite examine, which additionally didn’t embody diabetic sufferers however included hypertensives, discovered no circumstances of proteinuria however did discover a increased incidence of microalbuminuria in these with HTN (19 versus 9.7%) (7). In contrast to our examine, each of those research included non-obese, obese sufferers whose BMI was higher than 27. The third and by far largest examine addressing prevalence was the PREVEND examine from the Netherlands, revealed in 2003 (8). That examine, which excluded diabetics, discovered a prevalence of microalbuminuria of 21 or 13% relying on central or peripheral weight problems patterns (with central weight problems having a better incidence). Roughly half of the sufferers within the examine had HTN, however the prevalence of albuminuria with and with out HTN was not supplied within the overweight inhabitants studied by PREVEND.

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Our examine is the primary, to our information, in an American city inhabitants. Our examine, in contrast to earlier research, additionally solely included really overweight sufferers with BMI ≥ 30. Nonetheless, the prevalence of albuminuria is remarkably much like the findings from France greater than 20 years in the past in an overweight and obese inhabitants with out diabetes or HTN (6, 7). That is additionally one of many first research on an overweight inhabitants to deal with proteinuria along with albuminuria in an overweight inhabitants.

NHANES 3 knowledge from 2002 confirmed that within the US inhabitants, 5.1% of individuals with out diabetes or HTN had albuminuria and 0.3% had macroalbuminuria (9). Thus, though it’s clear that concomitant diabetes or HTN drastically will increase the danger of albuminuria and proteinuria, it’s evident from our examine that weight problems itself greater than doubled the prevalence of albuminuria in comparison with normal inhabitants. That is in keeping with a current report that “metabolically healthy obesity” with out HTN or proof of metabolic syndrome remains to be related to the event of power kidney illness (10).

We discovered a better prevalence of proteinuria and albuminuria in comparison with earlier stories of renal illness in diabetics. For instance, UKPDS reported 28% microalbuminuria and seven% proteinuria prevalence after 15 years of kind 2 diabetes (11). A report in kind 1 diabetes discovered 34% microalbuminuria and 15% proteinuria after 18 years of median observe up (12). The upper prevalence in our inhabitants, particularly in comparison with kind 2 diabetics, may very well be as a result of concomitant weight problems. Certainly, a broadcast evaluation of the Diabetes Management and Issues Trial discovered that each waist circumference and BMI have been danger components for the event of incident microalbuminuria over 5.8 years in kind 1 diabetics (13). Sadly, in our inhabitants, we should not have data of percentages on kind 1 versus kind 2 diabetes, the period of diabetes, nor the hemoglobin A1Cs of our sufferers with a view to additional refine dangers components for diabetic kidney illness.

Roughly, 1 / 4 of our sufferers have been on ACEI or ARB and it’s possible that the prevalence of proteinuria and albuminuria in addition to absolutely the quantities of albumin and protein excretion can be affected by means of these medicines. Certainly, it’s possible that the extent of renal illness in our sufferers is underestimated by our examine. A examine from Spain confirmed that renal pathological modifications, together with mesangial matrix improve, mesangial proliferation, podocyte, and glomerular hypertrophy, may very well be present in a excessive share of very overweight (BMI ≥ 40) sufferers present process bariatric surgical procedure, regardless of having no medical proof of renal illness (14).

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A limitation of our examine is that albuminuria and proteinuria have been decided from a single morning urine pattern. Nonetheless, research have proven that morning random urine protein/creatinine samples correlate effectively with 24-h urine protein and should even be extra predictive of renal illness development than 24-hcollections (15). We additionally didn’t have data on uric acid ranges, triglycerides with a view to assess different elements of the metabolic syndrome, which additionally could add to the dangers for kidney illness. We didn’t measure renin angiotensin aldosterone activation, leptin, or different adipokines which might have a bearing on renal pathophysiology. Lastly, we didn’t assess for weight problems sample, peripheral or central, as was finished within the PREVEND examine.

Additionally, it should be famous that our sufferers have been particularly overweight sufferers who have been present process bariatric surgical procedure. These sufferers possible differ in vital methods from a non bariatric surgical procedure overweight inhabitants. On the one hand, these sufferers have been cleared for main elective surgical procedure, which presumably excluded sufferers at highest cardiovascular danger. Alternatively, the truth that they determined to bear the surgical procedure could mirror a priority for danger components comparable to concomitant DM and HTN and different issues of weight problems that would affect renal illness.

In conclusion, we discovered a comparatively excessive prevalence of albuminuria and proteinuria in an city, US, overweight inhabitants present process bariatric surgical procedure. When diabetics have been excluded, there was a decrease prevalence and the imply quantities of proteinuria and albuminuria have been much less. Non-diabetic overweight sufferers with HTN had extra albuminuria and proteinuria than these with out HTN, however this didn’t attain statistical significance in our inhabitants. Overweight sufferers who had neither diabetes nor HTN, in different phrases with out one other obvious reason behind renal illness, nonetheless had a lot higher quantities than seen within the normal United States inhabitants as described within the NHANES knowledge. This possible displays an adversarial impact of weight problems itself on renal physiology. Contemplating that albuminuria and proteinuria are effectively acknowledged danger components for progressive renal illness in addition to heart problems, this highlights one cause amongst many for the essential have to reverse the rising worldwide weight problems epidemic.


Ethics Assertion

All procedures carried out in research involving human contributors have been in accordance with the moral requirements of the institutional and/or nationwide analysis committee and with the 1964 Helsinki declaration and its later amendments or comparable moral requirements. The native institutional assessment board of Northwell well being authorized the protocol and located it compliant with moral requirements together with the requirement for knowledgeable consent (IRB examine approval #HS15-0574).


Creator Contributions

JR: major investigator and corresponding creator. MP: renal fellow, major knowledge collector, and assisted manuscript preparation. GS: statistician. SP: renal fellow and assisted with manuscript preparation. MFM: division chair, assisted in guiding venture and edited manuscript.

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