Value of serum N-terminal pro-brain natriuretic peptide levels in primary screening peritoneal dialysis patients with volume overload

Abstract

Abstract:

ObjectiveTo explore the relationship between serum N-terminal pro-brain natriuretic peptide (NT-proBNP) level and hydration status and cardiac function indexes in the patients receiving peritoneal dialysis(PD) treatment，and to further analyze the factors affecting the level of NT-proBNP.MethodsA total of 111 patients with PD who were followed up in the PD Center of Ruijin Hospital, Shanghai Jiao Tong University School of Medicine from May 2019 to January 2022 were enrolled and the data was analyzed retrospectively. According to the results of multi-frequency bioelectrical impedance body composition monitor (BCM), relative hydration status (DHS), the ratio obtained through dividing extracellular water (ECW) by overhydration (OH), the patients were divided into normal volume group (OH/ECW≤15%) and overhydration group (OH/ECW>15%). The relationship between serum NT-proBNP level and hydration status in two groups was compared, and the related factors affecting the level of NT-proBNP were further analyzed and discussed. Using BCM result as the“gold standard”, the receiver operator characteristic curve(ROC curve) determined the optimal threshold of NT-proBNP as the capacity was overloaded. The patients were divided into two groups according to NT-proBNP and their clinical data were compared.ResultsThe indexes including systolic blood pressure, urine volume, urea clearance index (Kt/V), creatinine clearance rate(CCr), dialysate to plasma ratio for urea at 4 hours(4hD/PCr), types of antihypertensive drugs, type of diuretic, hemoglobin, serum albumin, log₂(NT-proBNP), interventricular septal thickness (IVST), left ventricular posterior wall thickness(LVPWT), left atrial diameter(LAD), OH, TBW, ECW, OH/TBW, ECW/TBW and ECW/ICW were detected in volume overload group and normal volume group, and showed statistically significant (allP<0.05). log₂(NT-proBNP) level was correlated with systolic blood pressure, dialysis duration, ultrafiltration volume, dialysis dose, antihypertensive drug group, IVST, LVPWT, LAD, left ventricular end-systolic dimension (LVESD), left ventricular end-diastolic dimension (LVEDD), OH, OH/ECW were positively correlated (allP<0.05). It was negatively correlated with urine volume, Kt/V, CCr, normalized protein catabolic rate (nPCR), hemoglobin, serum albumin and LVEF (allP<0.05). NT-proBNP 4 896 ng/L could be used as the critical value of initial screening capacity overload and was applied to divide the patients into two groups, and the systolic blood pressure, urine volume, ultrafiltration volume, Kt/V, CCr, IVST, LVPWT, OH/ECW indicators showed significant differences (allP<0.05) in two groups.ConclusionsThe level of NT-proBNP in PD patients is generally increased, and it indicates volume overload as its value is greater than 4 896 ng/L, which can be used as a simple monitoring index for the preliminary judgment of volume overload in PD patients.

Key words:Peritoneal dialysis,N-terminal pro-brain natriuretic peptide,Capacity overload,Multifrequency bioresistance method,Echocardiography

CLC Number:

R459.5

LI Hua, HUANG Xiaomin, ZHANG Chunyan, DU Lu, REN Hong, XU Tian. Value of serum N-terminal pro-brain natriuretic peptide levels in primary screening peritoneal dialysis patients with volume overload[J]. Journal of Internal Medicine Concepts & Practice, 2023, 18(03): 157-164.

Figures/Tables6

指标	容量正常组（n=59）	容量超负荷组（n=52）	统计量	P
年龄（岁）	55.99±14.75	53.91±14.57	0.155	>0.05
性别（男/女）	29/31	34/18	2.967	>0.05
BMI（kg/m²）	22.53±2.84	22.39±3.38	2.010	>0.05
收缩压（mmHg）	140.00±20.64	152.50±24.12	0.283	0.004
舒张压（mmHg）	82.75±11.72	86.54±13.46	0.608	>0.05
透析龄（月)	62.3（46.5，81.2）	65.8（42.8，92.5）	3 134.0	>0.05
透析剂量（L/24 h）	7.84±1.80	8.46±1.75	0.391	>0.05
尿量（mL/24 h）	800（220，1 200）	300（0，748)	2 373.5	0.001
超滤量（mL/24 h）	500（225，760）	665（325，975）	2 979.0	>0.05
Kt/V	2.24±0.42	2.04±0.49	2.588	0.024
CCr（L/周）	70.75±25.99	58.72±19.22	7.145	0.007
nPCR	0.94±0.16	0.92±0.21	1.910	>0.05
4hD/PCr（μmol/L）	0.59±0.09	0.65±0.11	4.685	0.003
腹膜转运类型（低/高）	44/15	24/28	9.409	0.002
降压药种类（<3种及≥3种）	46/13	22/29	14.058	0.000
利尿剂种类（有/无）	54/5	32/19	13.283	0.000
CRP（mg/L）	1.55（0.52，4.63）	1.87（0.65，5.81）	3 129.5	>0.05
血红蛋白（g/L）	112.22±16.07	105.25±17.27	0.555	0.030
血钠（mmol/L）	141.28±2.86	140.92±2.75	0.348	>0.05
血糖（mmol/L）	5.25±1.78	4.98±1.13	1.370	>0.05
血清白蛋白（mmol/L）	36.71±4.34	33.81±4.83	0.535	0.001
血钙（mmol/L）	2.34±0.16	2.28±0.17	0.632	>0.05
血磷（mmol/L）	1.69±0.45	1.73±0.53	1.749	>0.05
总胆固醇（mmol/L）	5.09±1.07	4.77±1.29	1.966	>0.05
甘油三酯（mmol/L）	2.02±1.10	1.71±1.12	0.016	>0.05
低密度脂蛋白（mmol/L）	3.11±0.93	2.90±1.04	0.820	>0.05
Iog₂（NT-proBNP）	10.93±2.22	12.60±1.95	1.171	0.000

指标	容量正常组（n=59）	容量超负荷组（n=52）	统计量	P
IVST（mm）	9.90±1.50	11.04±2.10	1.375	0.002
LVPWT（mm）	9.65±1.57	10.51±2.43	2.408	0.037
LAD（mm）	38.50±5.20	41.12±4.68	0.455	0.009
LVESD（mm）	32.42±5.40	32.57±4.63	0.334	>0.05
LVEDD（mm）	50.39±5.56	51.31±4.98	1.458	>0.05
LVESV（mL）	44.50±20.12	44.33±15.93	0.354	>0.05
LVEDV（mL）	122.56±32.64	128.10±29.53	1.126	>0.05
LVEF（%）	64.65±6.69	65.82±5.03	0.546	>0.05
OH（L）	1.4（0.8，2.3）	3.9（3.2，5.28）	1 847.0	0.000
TBW（L）	34.30±7.03	38.28±9.94	3.437	0.016
ECW（L）	15.65±2.90	18.78±4.83	5.361	0.000
ICW（L）	18.65±4.34	19.50±5.46	1.599	>0.05
OH/TBW	0.46（0.24，0.62）	0.11（0.84，0.14）	1 778.0	0.000
ECW/TBW	0.460±0.027	0.493±0.029	0.347	0.000
ECW/ICW	0.855±0.092	0.978±0.116	2.363	0.000

指标	r	P
收缩压	0.320	0.001
透析龄	0.301	0.001
超滤量	0.435	0.000
透析剂量	0.469	0.000
降压药分组	0.404	0.000
IVST	0.534	0.000
LVPWT	0.543	0.000
LAD	0.547	0.000
LVESD	0.346	0.000
LVEDD	0.357	0.000
OH	0.496	0.000
OH/ECW	0.516	0.000
尿量	-0.589	0.000
总Kt/V	-0.352	0.000
总CCr	-0.538	0.000
nPCR	-0.192	0.043
血红蛋白	-0.382	0.000
血清白蛋白	-0.228	0.016
LVEF	-0.213	0.032

指标	NT-proBNP≥4 896 ng/L（n=48）	NT-proBNP<4 896 ng/L（n=63）	统计量	P
BMI（kg/m²）	22.85±2.91	22.15±3.23	0.227	>0.05
收缩压（mmHg）	152.40±25.06	140.29±19.95	2.032	0.005
尿量（mL/24 h）	135.0（0，437.5）	800（500，1 200）	1 792.5	0.000
超滤量（mL/24 h）	767.0（500.0，1 022.5）	480（224，698）	2 896.0	0.000
Kt/V	1.97±0.38	2.28±0.47	1.033	0.000
CCr（L/周）	51.7（45.8，56.9）	69.3（52.8，90.3）	1 886.0	0.000
IVST（mm）	11.47±2.07	9.71±1.34	2 261.5	0.000
LVPWT（mm）	11.16±2.49	9.26±1.18	2 248	0.000
LVEF（%）	63.84±7.48	66.24±7.48	1 996.5	0.044
OH/ECW	0.21±0.10	0.12±0.07	5.593	0.000

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