Q) Recently, I have seen four or five Asian-American patients with really bad kidney function. All of them were thin but had diabetes, hypertension, and a serum creatinine > 2 mg/dL. The kidney disease was a shock to them (and me). Am I missing something here?
Diabetes and hypertension are the most common causes of chronic kidney disease (CKD), with diabetes slightly edging out hypertension for the number 1 slot.1 Although Asian Americans have a tendency toward a lower body mass index (BMI) than the general population, this does not exclude them from developing diabetes or hypertension.
About 20% (1 in 5) of Asian-American adults have both diabetes and hypertension. In fact, Asian Americans with a BMI ≤ 25 often develop type 2 diabetes (T2DM), which is a direct contrast to other racial and ethnic groups in whom T2DM is more prevalent at higher BMIs. The current thinking is that Asian Americans have a higher percentage of body fat at lower BMIs.2 Among racial and ethnic subgroups, Asian Americans have the highest prevalence of undiagnosed diabetes (close to 50%).2
In 2004, after adjusting for lower BMI, McNeely and Boyko found that the incidence of diabetes in Asian Americans was 60% higher than in the Hispanic population.3 In 2015, this influenced the American Diabetes Association (ADA) to change its recommendation for diabetes screening in Asian Americans, lowering the threshold to a BMI of 23.4
Since abdominal or visceral fat is a risk factor for heart disease, hypertension, and diabetes, and it appears that the Asian-American population carries excess fat centrally, this population is also at risk for cardiac disease.5 For that reason, in this population, the American Heart Association recommends measuring waist circumference to screen for hidden abdominal adiposity.6
Thus, the trend you are seeing in your patient population is really only the tip of the iceberg. The Asian-American population is the fastest-growing ethnic group in the United States.3 It’s time to update your diabetes screening protocols. —SWM
Shushanne Wynter-Minott, DNP, FNP-BC
Memorial Healthcare System, Hollywood, Florida
References
1. CDC. National Chronic Kidney Disease Fact Sheet, 2014. www.cdc.gov/diabetes/pubs/pdf/kidney_Factsheet.pdf. Accessed February 3, 2016.
2. Menke A, Casagrande S, Geiss L, Cowie CC. Prevalence of and trends in diabetes among adults in the United States, 1988-2012. JAMA. 2015;314(10):1021-1029.
3. McNeely MJ, Boyko EJ. Type 2 diabetes prevalence in Asian Americans: results of a national health survey. Diabetes Care. 2004;27(1):66-69.
4. American Diabetes Association. Standards of medical care in diabetes—2015: summary of revisions. Diabetes Care. 2015;38(suppl):S4.
5. Park YW, Allison DB, Heymsfield SB, Gallagher D. Larger amounts of visceral adipose tissue in Asian Americans. Obes Res. 2001;9(7):381-387.
6. Rao G, Powell-Wiley TM, Ancheta I, et al; American Heart Association Obesity Committee of the Council on Lifestyle and Cardiometabolic Health. Identification of obesity and cardiovascular risk in ethnically and racially diverse populations: a scientific statement from the American Heart Association. Circulation. 2015;132(5):457-472.