Assessment of body composition using dry mass index and ratio of total body water to estimated volume based on bioelectrical impedance analysis in chronic kidney disease patients.

OBJECTIVE: Body mass index (BMI) is commonly used for assessment of nutritional status. However, changes in BMI in chronic kidney disease (CKD) patients are affected not only by muscle and fat but also by fluid volume. The ratio of extracellular water (ECW(BIA)) to total body water (TBW(BIA)) in multifrequency bioelectrical impedance analysis is commonly used for assessing abnormal fluid status. This study reexamines ECW(BIA)/TBW(BIA) and evaluates the reliability of TBW(BIA)/TBW(watson) and dry mass index (DMI) in the assessment of fluid and nutritional status. DESIGN, SETTING, AND SUBJECTS: TBW(BIA), intracellular water (ICW(BIA)), and ECW(BIA) were measured in 45 randomly selected CKD patients. Participants were surveyed for age, gender, BMI, blood pressure, serum albumin, estimated glomerular filtration rate, and proteinuria. DMI was calculated by the formula ([weight--TBW(BIA)]/height(2)) and TBW(BIA)/TBW(watson) using an anthropometric formula (Watson). Fluid and nutritional status were assessed using ECW(BIA)/TBW(BIA), TBW(BIA)/TBW(watson), and DMI. RESULTS: TBW(BIA)/TBW(watson) positively correlated with weight, BMI, and diastolic blood pressure and negatively correlated with age and serum albumin level. In contrast, ECW(BIA)/TBW(BIA) correlated with ICW deficit, aging, and body weight loss. On the basis of DMI and TBW(BIA)/TBW(watson), participants were categorized as follows: 1 obese patient with hypovolemia and 2 with euvolemia; 17 overweight patients with hypovolemia (n = 6), euvolemia (n = 8), or hypervolemia (n = 3); 24 patients of optimal weight with hypovolemia (n = 10), euvolemia (n = 9), or hypervolemia (n = 5); and 1 underweight patient with euvolemia. CONCLUSIONS: A combination of DMI, BMI, and TBW(BIA)/TBW(watson) makes it possible to include assessment of fluid volume to the physique index. In addition, ECW(BIA)/TBW(BIA) is not a reliable marker of edematous state in CKD patients.

Associations of proteinuria, fluid volume imbalance, and body mass index with circadian ambulatory blood pressure in chronic kidney disease patients.

BACKGROUND/AIMS: Obesity and hypervolemic status are the main causes of hypertension in patients with chronic kidney disease (CKD). However, it is difficult to differentiate between them. We aimed to assess the associations of body mass index (BMI) and total body water (TBW) with ambulatory blood pressure (ABP). METHODS: Body composition by bioelectrical impedance analysis (BIA) and 24-h ABP were measured in 40 patients with CKD. TBW was assessed using corrected TBWBIA adjusted for body surface area (cTBWBIA) and the TBWBIA/TBWWatson ratio obtained using an anthropometric formula (Watson). RESULTS: Elevated ABP (average 24-h BP ≥ 135/85 mmHg) was noted in 23 patients, who were more likely to have a higher cTBWBIA and TBWBIA/TBWWatson ratio than patients without elevated BP. Patients with nocturnal non-dipping (<10% drop in BP during sleep) were more likely to have a higher TBWBIA/TBWWatson ratio. Proteinuria and the TBWBIA/TBWWatson ratio were significant independent factors for 24-h ABP. BMI had a positive correlation with the cTBWBIA, TBWBIA/TBWWatson ratio and furosemide use. CONCLUSION: Hypertension is dependent on proteinuria and fluid volume imbalance. The TBWBIA/TBWWatson ratio can serve as an indicator of fluid volume-dependent hypertension. BMI is affected by TBW, in which case BMI can become less involved with 24-h ABP.

Characteristics of fulminant type 1 diabetes mellitus.

BACKGROUND: Fulminant type 1 diabetes is characterized by acute onset and rapid development of ketoacidosis. CASE REPORT: We present three cases of fulminant type 1 diabetes we experienced at our hospital. All three patients showed extremely high levels of plasma glucose, low HbA1c levels, positivity for urinary ketone bodies, ketoacidosis, and low C-peptide excretion. Flu-like symptoms were noted a few days before hospitalization, and increases in the WBC and CRP levels were observed. Interestingly, case 1 was negative for anti-GAD antibody at the time of hospitalization but became positive 22 days later. Moreover, this patient reverted to being negative for anti-GAD antibody 93 days later. Cases 1 and 3 were positive for HLA-DR4 and HLA-DR9, and Case 2 was positive for HLA-DR4. All three individuals had flu-like symptoms and showed inflammatory markers in the blood. CONCLUSIONS: Although autoimmune abnormalities are not usually linked with fulminant type 1 diabetes, the conclusion drawn from the present study is that patients with this disease should be monitored on several different occasions for autoimmune antibodies.