Skip to main content

Advertisement

A hybrid neural network model for predicting kidney disease in hypertension patients based on electronic health records

Article metrics

  • 899 Accesses

  • 4 Citations

Abstract

Background

Disease prediction based on Electronic Health Records (EHR) has become one hot research topic in biomedical community. Existing work mainly focuses on the prediction of one target disease, and little work is proposed for multiple associated diseases prediction. Meanwhile, a piece of EHR usually contains two main information: the textual description and physical indicators. However, existing work largely adopts statistical models with discrete features from numerical physical indicators in EHR, and fails to make full use of textual description information.

Methods

In this paper, we study the problem of kidney disease prediction in hypertension patients by using neural network model. Specifically, we first model the prediction problem as a binary classification task. Then we propose a hybrid neural network which incorporates Bidirectional Long Short-Term Memory (BiLSTM) and Autoencoder networks to fully capture the information in EHR.

Results

We construct a dataset based on a large number of raw EHR data. The dataset consists of totally 35,332 records from hypertension patients. Experimental results show that the proposed neural model achieves 89.7% accuracy for the task.

Conclusions

A hybrid neural network model was presented. Based on the constructed dataset, the comparison results of different models demonstrated the effectiveness of the proposed neural model. The proposed model outperformed traditional statistical models with discrete features and neural baseline systems.

Background

In the modern society, people may suffer from all kinds of diseases, e.g., coronary heart disease, diabetes, hypertension, kidney disease, etc. More seriously, some people may be attacked by multiple diseases simultaneously. These diseases are often related to each other. Multiple associated diseases prediction is an important research topic in biomedical field, which aims to predict the prevalence of a target disease in the condition of the other certain disease that is already diagnosed.

Among these diseases, kidney disease is a worldwide public health issue. Many studies have been conducted for kidney disease risk analysis, and hypertension is commonly considered to be closely related for the development of kidney disease [17]. However, the risk factors that cause hypertension patients develop into kidney disease remain unclear.

Electronic Health Record (EHR) usually contains two main information: textual description and discrete physical indicators. A piece of EHR are shown in Fig. 1. We can see that a patient is diagnosed with hypertension on January 5, 2017. Three months later, he is diagnosed with kidney disease. Given a patient who has been diagnosed with hypertension, this paper aims to predict the probability of the person to suffer from kidney disease.

Fig. 1
figure1

A piece of EHR from one hypertension patient

In recent years, researchers begin to explore the task of the disease prediction by using machine learning techniques. Existing work mainly focuses on the prediction of one target disease [811]. For example, Jabbar et al., (2016) use random forest and chi square to predict heart disease [11]. Meanwhile, existing work mostly explores underlying molecular mechanisms of diseases [1214]. Typically, Le and Dang (2016) propose a ontology-based disease similarity network for disease gene prediction [12]. However, little work is proposed for multiple associated diseases prediction. More recently, Chen et al., (2017) evaluate the risk factors that cause hypertension patients develop into coronary heart disease by using Logistic Regression (LR) model [15]. However, this model only uses the numerical physical indicators in EHR, which limits the performance of the task.

Recently, neural network models have been extensively used for text analysis tasks [1618], achieving competitive results. Potential advantage of using neural networks for the disease prediction is that neural models use hidden layer for automatic feature combinations, which can capture complex semantic information that is difficult to express using traditional discrete manual features. This motivates a neural network model, which integrates the textual description information and physical indicators in EHR, for predicting kidney disease in hypertension patients.

In this paper, we first model the prediction problem as a binary classification task. Then, we construct a dataset based on a large amount of raw EHR data. Third, we build a hybrid neural network which incorporates Bi-directional Long Short Term Memory (BiLSTM) and Autoencoder network for the task. Here, BiLSTM is used for learning the textual features from textual description information. The Autoencoder network takes the numerical indicators as input for capturing important numerical cues. Experimental results show that the proposed neural model achieves the current best performance, significantly outperforming traditional discrete models and neural baseline systems. To our knowledge, our study is the first one for multiple associated diseases prediction task by using neural network.

Related work

Disease prediction, especially the chronic diseases, has received more and more attention from researchers in the biomedical field [1922]. Early researches mainly focus on the numerical factors including physical examination factors, laboratory test features, and demographic information. For example, Wilson et al., (1998) predicted the risk of coronary heart disease by using Logistic Regression model with an array of discrete factors [8]. The follow-up studies tried to estimate coronary heart disease by considering more non-traditional risk factors, in order to yield better performance [19, 23]. However, these work focuses on the prediction of single target disease. Meanwhile, these methods mainly use discrete models with hand-crafted features.

About ten years ago, researchers began to predict the disease risks from the genetic study and tried to find underlying molecular mechanisms of diseases [2426]. For example, Wray et al., (2007) proposed to assess the genetic risk of a disease in healthy individuals based on dense genome-wide Single-Nucleotide Polymorphism (SNP) panels [26]. More recently, some researches explored the genes associated with the diseases to better understand the pathobiological mechanisms of these diseases [13, 14]. However, there is still a lack of the studies for multiple associated diseases prediction.

In recent years, neural network models have extensively been used for various NLP tasks, achieving competitive results [2729]. The representative neural models include Convolutional Neural Network (CNN), Recurrent Neural Network (RNN), Long Short-Term Memory (LSTM) and Autoencoder, etc. Neural models are gradually applied in the tasks of biomedical field [3034]. For example, Zhao et al., (2016) trained a deep multi-layer neural network model to extract protein-protein interactions information from biomedical literature [31]. However, neural networks have not been used for the task of multiple associated diseases prediction. In this paper, we explore a hybrid neural model for predicting kidney disease in hypertension patients.

Methods

Task modeling

When a patient is suffering from hypertension, the task aims to predict the probability of this patient who also has kidney disease. We model the prediction task based on the following steps.

  1. 1

    We construct a dataset D from the ground-truth EHR which contain these two diseases or only hypertension. Note that hypertension is labeled as \(\mathcal {H}\), and kidney disease is labeled as \(\mathcal {K}\). Specifically, positive examples indicate that patients suffer from both disease \(\mathcal {H}\) and \(\mathcal {K}\), which is denoted as D+D. Negative examples indicate that patients suffer from disease \(\mathcal {H}\) but not \(\mathcal {K}\), which is denoted as DD.

  2. 2

    At the training phase, we use the dataset D that contains both D+ and D to train our model \(\mathcal {M}\).

  3. 3

    At the test phase, we apply the well-trained model \(\mathcal {M}\) to predict a new EHR d of one patient, in which the diagnosis of \(\mathcal {H}\) is confirmed, and the prevalence rate of \(\mathcal {K}\) is to be inferred by \(\mathcal {M}\).

Neural network model

Figure 2 illustrates the proposed neural network, which includes two main parts: BiLSTM and Autoencoder. Here, BiLSTM is used for learning the continuous representation from the textual description information in EHR. Autoencoder is used for learning the continuous representation from the physical indicators in EHR.

Fig. 2
figure2

The proposed neural network framework

Textual representation

The input from textual sentence describes the basic disease symptoms which may imply useful information behind the texts. We use an embedding layer to take the textual data as input. For each word or phrase wi, we use a look-up table E to obtain its embedding e(wi)RL, where ERL×V is a parameter, L represents the dimension of embedding vector and V is the vocabulary size.

Then, a BiLSTM network is used to obtain the representation of each sentence. BiLSTM models a recurrent state transform sequence from an input sequence to a hidden state sequence. Basically, a LSTM represents each time step with an input, a memory and an output gate, denoted as it,ft and ot, respectively.

$$ \begin{aligned} i_{t}&= \sigma \left(W^{(i)}\right) x_{t} + U^{(i)} h_{i-1} + b^{i}\\ f_{t}&= \sigma \left(W^{(f)}\right) x_{t} + U^{(f)} h_{i-1} + b^{f} \\ o_{t}&= \sigma \left(W^{(o)}\right) x_{t} + U^{(o)} h_{i-1} + b^{o} \\ u_{t}&= tanh \left(W^{(u)}\right) + U^{(u)} h_{i-1} + b^{u}\\ c_{t}&= i_{t} \odot u_{t} + f_{t} \odot c_{t-1}\\ h_{t}&= o_{t} \odot tanh(c_{t})\\ \end{aligned} $$
(1)

Where σ denotes the sigmoid function. Similar to the LSTM network, the architecture of BiLSTM network is designed to model the context dependency from the past and future. BiLSTM network has two parallel layers in both forward and backward directions, whose outputs is formulated as:

$$ \begin{aligned} h_{f_{t}}& = \sigma \left(W_{xh_{f}} x_{t} + W_{h_{f} h_{f}} h_{f_{t-1}} + b_{h_{f}}\right)\\ h_{b_{t}} &= \sigma \left(W_{xh_{b}} x_{t} + W_{h_{b} h_{b}} h_{f_{t-1}} + b_{h_{b}}\right) \\ \end{aligned} $$
(2)

Here, the \(h_{f_{t}}\) and \(h_{b_{t}}\) denote the output of LSTM unit in forward layer and backward layer, respectively. We then concatenate these two hidden outputs as one total output:

$$ h^{(T)} = \left[h_{f_{t}};h_{b_{t}}\right] $$
(3)

Based on the BiLSTM modeling, we obtain textual representation h(T).

Numerical representation

For numerical features in our clinical data, since we replace the null values with the overall mean value, some of the values are correlated. Using these values directly may affect the performance of the task. Previous work shows that the denoising Autoencoder network can be utilized to reduce the high dimensionality and eliminate correlation [35]. Therefore, we employ this model to handle the numerical features.

Autoencoder is a network with multiple encoding layers, followed by one affine linear decoding layer. It maps the numerical values vector v into a hidden representation using an encoder function as follows:

$$ h^{(e)} = h\left(W^{(e) \cdot v + 1}\right) $$
(4)

Then, a linear decoder reconstructs the hidden representation as follows:

$$ h^{(d)} = A \cdot h\left(W^{(d) \cdot h^{(e)} + 1}\right) $$
(5)

where A=(W2)T is a parameter, and h is ReLU function. Finally, we obtain a refined representation h(d) of discrete physical values.

Outpur layer

A fully connected layer is used to combine two types of vectors from textual representation and numerical representation. This layer can be computed as:

$$ h^{(A)} = h\left(W^{(A)}\right) \cdot \left[ \begin{array}{c} h^{(T)}\\ h^{(d)} \end{array} \right] $$
(6)

where W(A) is a parameter, and h is ReLU function. Here, the dropout technique is utilized to avoid the overfitting. Finally, we employ the softmax activation function as the classifier in the bottom of the fully connected layer to obtain the output.

Datasets

To construct the dataset of this task, we gather a large amount of EHR data, which is from the hospitals of 12 cities in China, with a span of 5 years ranging from 2012 to 2017. First, raw EHR data contains some personal privacy, e.g., patients’ name, resident ID number and institute number etc., so we remove these contents by pre-processing. Then, we merge records belonging to same patient into just one record. Specifically, a patient who suffers from different diseases receives more than one EHR with different diagnosis, but the physical indicators still keep same. Finally, we select a set of records from the merged EHR based on two criteria:

  • A record where the patient suffers from both hypertension and kidney disease is selected as positive example.

  • A record where the patient suffers from only hypertension is selected as negative example.

Based on the above steps, we get totally 35,332 records, in which 34,232 records are negative examples and 1100 records are positive examples. This is an extremely imbalanced dataset, and is problematic for directly conducting the experiments. To solve this problem, we employ undersampling method to balance the classes. Specifically, we decrease the size of majority class by randomly sampling a number of 1100 records in 34,232 records, so there are total 2200 examples in the dataset after undersampling, which is marked as D. In order to make full use of the dataset and make the result more credible, undersampling is repeated ten times. The final accuracy is the average result of the algorithms in all ten experiments.

Experimental settings

We perform ten-fold cross-validation experiments and report the overall performances. The whole dataset is split into ten equal sections, each decoded by the model trained from the remaining nine sections. We randomly choose one section from the nine training sections as the development dataset in order to tune hyper-parameters. The classification result is measured by accuracy.

Model parameters

There are two types of parameters in our experiments, including hyper-parameters and other settings. Specifically, L denotes the dimension of the word vectors, LBiLSTM is the maximum length of the input textual sequences, NAE is the number of Autoencoder layer, NMLP is the number of fully connected layers. The dropout rate in fully connected layer is denoted as Rdropout. λ is the initial learning rate for AdamGrad. In our model, the word embedding, E, is randomly initialized with uniform samples from \(\left [-\sqrt {\frac {6}{r+c}}, +\sqrt {\frac {6}{r+c}}\right ]\), where r and c are the number of of rows and columns in the structure. Parameters are shown in Table 1.

Table 1 Parameter values of the model in the experiments

Baselines

To demonstrate the effectiveness of the proposed algorithm, we re-implement the baseline systems which include discrete models and neural models. For each baseline model, we conduct the experiments by three types of inputs: 1) textual input only, note as Textual; 2) numerical input only, note as Numerical; 3) textual input and numerical input, note as Textual+Numerical.

Discrete models: Naive Bayes (NB), Support Vector Machine (SVM) and Gradient Boosting Decision Tree (GBDT) are used. These discrete models have extensively been used for text classification tasks, giving competitive results [36, 37]. Besides, Chen et al. (2017) explored the prediction problem of hypertension to coronary heart disease using Logistic Regression (LR) model combined with numerical physical indicators [15]. So we also use LR as a baseline.

Neural models: We use two neural models as neural baselines including Convolutional Neural Network (CNN) and Bi-directional Long Short Term Memory (BiLSTM). Besides, we integrate the Autoencoder (AE) with the neural model CNN as a hybrid model of CNN+AE, to make use of two types of features.

Results

Based on the constructed dataset, Table 2 show experimental results of different discrete models. We can know that the LR model proposed by Chen et al. (2017) only gives 64.9% accuracy. The main reason is that this model only takes numerical physical indicators as input, ignoring the textual description information in EHR. This limits the performance of the task. By integrating the textual description information, the performance can be improved to 72.2% in accuracy. The NB model gives 76.6% accuracy based on Textual+Numerical features, outperforming the discrete LR model. This shows the effectiveness of the NB model in this task. Among all discrete models, SVM gives the relatively lowest results, giving 71.3% accuracy based on mixed features. The GBDT gives the highest accuracy (81.2%) based on Textual+Numberical features among all discrete models. The main reason is that GBDT is a boosting model which contains multiple meta classifiers and uses the assembling mechanism, and this makes GBDT model more powerful.

Table 2 Experimental results of the discrete baseline models

Table 3 shows the experimental results of different neural models. Among the neural baseline models, CNN achieves 86.2% accuracy on Textual+Numberical features. By integrating AE, CNN+AE achieves 88.3% accuracy on Textual+Numberical features, which is significantly higher than discrete models. This demonstrates that the neural network has powerful ability to fully learn the intrinsic features from the clinical data. Remarkably, the proposed BiLSTM+AE model gives the highest accuracy (89.7%) on Textual+Numberical features. Note that the Textual feature and Numerical feature achieve a slight lower score than the Textual+Numberical features. This indicates that two attention modules exert the role in improving the performance. The above analysis shows the effectiveness of the proposed neural model.

Table 3 Experimental results of the neural models

Based on the above analysis, we can know that all model can give better performance based on the combination of textual and numerical features compared to the only textual features or numerical features. This is because different types of features in EHR data can both give their own contributions. Meanwhile, the results from only textual features are better than that from numerical features. The main reason is the textual description information intuitively carry strong cues for indicating a disease.

Discussions

We compare the output probability of the proposed neural model and the discrete model (GBDT) based on a test set to contrast the effect on discrete and neural features. Figure 3 shows the output probabilities of positive and negative classes. The x-axis shows the probability by the neural model and the y-axis shows the probability by the discrete model. The negative examples in the test set are shown in red, where positive examples are shown in black. As shown in the figure, most black dots are on the right of the figure and most red dots are on the left, showing that the results of neural model are correct in most cases. However, the dots are extremely more disperse in the y-axis and even many examples are wrongly scattered, which means that the discrete model is not very effective. This comparison demonstrates the effectiveness of our proposed neural model.

Fig. 3
figure3

Comparison of output probability

Conclusions

We proposed a hybrid neural network model by integrating BiLSTM and Autoencoder networks for the prediction task of kidney disease in hypertension patients. Based on the constructed dataset from raw EHR data, the proposed model significantly outperform the current discrete model and the strong neural baseline systems.

In future, we will explore two directions. First, we will explore an attention-based neural network for the task. The attention mechanism can give different weights for different factors. We can visualize the risk factors for leading kidney disease in hypertension patients.. Second, we will study the problem of coronary heart disease prediction in hypertension patients, and shows the risk factors that cause hypertension patients develop into coronary heart disease.

Abbreviations

AE:

Autoencoder

BiLSTM:

Bidirectional long short-term memory

CNN:

Convolutional neural network

EHR:

Electronic health records

GBDT:

Gradient boosting decision tree

ICD-10:

The 10th international classification of diseases

LSTM:

Long short-term memory

NB:

Naive Bayes

NLP:

Natural language processing

RNN:

Recurrent neural network

SVM:

Support vector machine

References

  1. 1

    Assmann G, Cullen P, Schulte H. Simple scoring scheme for calculating the risk of acute coronary events based on the 10-year follow-up of the prospective cardiovascular mnster (procam) study. Circulation. 2002; 105(3):310–5.

  2. 2

    Initiative KDOQ. K/doqi clinical practice guidelines on hypertension and antihypertensive agents in chronic kidney disease. Am J Kidney Dis. 2004; 43(1):1–290.

  3. 3

    Zandinejad K, Luyckx VA, Brenner BM. Adult hypertension and kidney disease the role of fetal programming. Hypertension. 2006; 47(3):502.

  4. 4

    Hippisleycox J, Coupland C, Vinogradova Y, Robson J, Minhas R, Sheikh A, Brindle P. Predicting cardiovascular risk in england and wales: prospective derivation and validation of qrisk2. Bmj Br Med J. 2008; 336(7659):1475–82.

  5. 5

    Collins GS, Altman DG. An independent external validation and evaluation of qrisk cardiovascular risk prediction: a prospective open cohort study. Bmj. 2009; 339(7713):144–7.

  6. 6

    Chen WW, Gao RL, Liu LS, Zhu ML, Wang W, Wang YJ, Wu ZS, Li HJ, Gu DF, Yang YJ. China cardiovascular diseases report 2015: a summary. J Geriatr Cardiol Jgc. 2017; 14(1):1–10.

  7. 7

    Luyckx VA, Perico N, Somaschini M, Manfellotto D, Valensise H, Cetin I, Simeoni U, Allegaert K, Vikse BE, Steegers EA. A developmental approach to the prevention of hypertension and kidney disease: a report from the low birth weight and nephron number working group. Lancet. 2017; 390(10092):424–8.

  8. 8

    Wilson PWF, Levy D, Belanger AM, Silbershatz H, Kannel WB. Prediction of coronary heart disease using risk factor categories. Circulation. 1998; 97(18):1837–47.

  9. 9

    Chambless LE, Folsom AR, Sharrett AR, Sorlie P, Couper D, Szklo M, Nieto FJ. Coronary heart disease risk prediction in the atherosclerosis risk in communities (aric) study. J Clin Epidemiol. 2003; 56(9):880–90.

  10. 10

    Agarwal S, Ghanty P, Pal NR. Identification of a small set of plasma signalling proteins using neural network for prediction of alzheimer’s disease. Bioinformatics. 2015; 31(15):2505–13.

  11. 11

    Jabbar MA, Deekshatulu BL, Chandra P. Prediction of heart disease using random forest and feature subset selection. In: Proceedings of International Conference on Innovations in Bio-Inspired Computing and Applications.Berlin: Springer: 2016. p. 187–196.

  12. 12

    Le DH, Dang VT. Ontology-based disease similarity network for disease gene prediction. Vietnam J Comput Sci. 2016; 3(3):197–205.

  13. 13

    Meng X, Zou Q, Rodriguezpaton A, Zeng X. Iteratively collective prediction of disease-gene associations through the incomplete network. In: IEEE International Conference on Bioinformatics and Biomedicine.New York: IEEE: 2017. p. 1323–30.

  14. 14

    Akram P, Li L. Prediction of missing common genes for disease pairs using network based module separation on incomplete human interactome. In: Proceedings of IEEE International Conference on Computational Advances in Bio and Medical Sciences.Berlin: Springer: 2017. p. 1.

  15. 15

    Chen R, Yang Y, Miao F, Cai Y, Lin D, Zheng J, Li Y. 3-year risk prediction of coronary heart disease in hypertension patients: A preliminary study. In: Proceedings of International Conference of the IEEE Engineering in Medicine & Biology Society.New York: IEEE: 2017. p. 1182–85.

  16. 16

    Ren Y, Zhang Y, Zhang M, Ji D. Context-sensitive twitter sentiment classification using neutal network. In: Proceedings of the Thirtieth AAAI Conference on Artificial Intelligence.Palo Alto: Association for the Advancement of Artificial Intelligence: 2016. p. 215–21.

  17. 17

    Zeng D, Sun C, Lin L, Liu B. Lstm-crf for drug-named entity recognition. Entropy. 2017;19(6):1–12.

  18. 18

    Ren Y, Ji D, Ren H. Context-augmented convolutional neural networks for twitter sarcasm detection. Neurocomputing. 2018; 308:1–7.

  19. 19

    Weedon MN, Mccarthy MI, Hitman G, Walker M, Groves CJ, Zeggini E, Rayner NW, Shields B, Owen KR, Hattersley AT. Combining information from common type 2 diabetes risk polymorphisms improves disease prediction. Plos Med. 2006; 3(10):374.

  20. 20

    Chiuve SE, Fung TT, Rimm EB, Hu FB, Mccullough ML, Wang M, Stampfer MJ, Willett WC. Alternative dietary indices both strongly predict risk of chronic disease. J Nutr. 2012; 142(6):1009.

  21. 21

    Flynt A, Daepp MIG. Diet-related chronic disease in the northeastern united states: a model-based clustering approach. Int J Health Geogr. 2015; 14(1):25.

  22. 22

    Chen GB, Lee SH, Montgomery GW, Wray NR, Visscher PM, Gearry RB, Lawrance IC, Andrews JM, Bampton P, Mahy G. Performance of risk prediction for inflammatory bowel disease based on genotyping platform and genomic risk score method. BMC Med Genet. 2017; 18(1):94.

  23. 23

    Polonsky TS, Mcclelland RL, Jorgensen NW, Bild DE, Burke GL, Guerci AD, Greenland P. Coronary artery calcium score and risk classification for coronary heart disease prediction. Jama. 2010; 303(16):1610.

  24. 24

    Cullen P., Funke H.Implications of the human genome project for the identification of genetic risk of coronary heart disease and its prevention in children. Nutr Metab Cardiovasc Dis Nmcd. 2001; 11 suppl 5(11 Suppl 5):45–51.

  25. 25

    Guglielmelli P, Zini R, Bogani C, Salati S, Pancrazzi A, Bianchi E, Mannelli F, Ferrari S, Le BKM, Bosi A. Molecular profiling of cd34+ cells in idiopathic myelofibrosis identifies a set of disease-associated genes and reveals the clinical significance of wilms’ tumor gene 1 (wt1). Stem Cells. 2010; 25(1):165–73.

  26. 26

    Wray NR, Goddard ME, Visscher PM. Prediction of individual genetic risk to disease from genome-wide association studies. Genome Res. 2007; 17(10):1520–8.

  27. 27

    Tang D, Qin B, Liu T. Document modeling with gated recurrent neural network for sentiment classification. In: Proceedings of International Conference on Empirical Methods in Natural Language Processing.Stroudsburg: Association for Computational Linguistics: 2015. p. 1422–32.

  28. 28

    Ren Y, Zhang Y, Zhang M, Ji D. Improving twitter sentiment classification using topic-enriched multi-prototype word embeddings. In: Proceedings of the Thirtieth AAAI Conference on Artificial Intelligence.Palo Alto: Association for the Advancement of Artificial Intelligence: 2016. p. 3038–44.

  29. 29

    Ren Y, Ji D. Neural networks for deceptive opinion spam detection: an empirical study. Inf Sci. 2017; 385-386:213–24.

  30. 30

    Bahdanau D, Cho K, Bengio Y. Neural machine translation by jointly learning to align and translate. Comput Sci. 2014. arXiv preprint arXiv:1409.0473.

  31. 31

    Zhao Z, Yang Z, Lin H, Wang J, Gao S. A protein-protein interaction extraction approach based on deep neural network. Int J Data Min Bioinforma. 2016; 15(2):145–64.

  32. 32

    Liu Z, Yang M, Wang X, Chen Q, Tang B, Wang Z, Xu H. Entity recognition from clinical texts via recurrent neural network. BMC Med Inform Decis Mak. 2017; 17(2):67.

  33. 33

    Chen L, Chen B, Ren Y, Ji D. Long short-term memory rnn for biomedical named entity recognition. BMC Bioinformatics. 2017; 18(1):462–93.

  34. 34

    Ren Y, Fei H, Peng Q. Detecting the scope of negation and speculation in biomedical texts by using recursive neural networks. In: Proceedings of 2018 IEEE International Conference on Bioinformatics and Biomedicine. New York: IEEE: 2018. p. 739–42.

  35. 35

    Fan Z, Bi D, He L, Ma S, Li C, Li C. Low-level structure feature extraction for image processing via stacked sparse denoising autoencoder. Neurocomputing. 2017; 243(C):12–20.

  36. 36

    Mccallum A, Nigam K. A comparison of event models for naive bayes text classification. In: Proceedings of the AAAI-98 Workshop on Learning for Text Categorization. Palo Alto: Association for the Advancement of Artificial Intelligence: 1998. p. 41–48.

  37. 37

    Mason L, Baxter J, Bartlett P, Frean M. Boosting algorithms as gradient descent. In: Proceedings of International Conference on Neural Information Processing Systems.Cambridge: MIT Press: 1999. p. 512–8.

Download references

Acknowledgements

Not applicable.

Funding

Publication of the article is supported by the National Natural Science Foundation of China (Grant No. 61702121, No. 61772378, No.61802350), the National Key Research and Development Program of China (No. 2017YFC1200500) and the Science and Technology Project of Guangzhou (No. 201704030002).

Availability of data and materials

The experimental data will not be shared as it involved in privacy conditions.

About this supplement

This article has been published as part of BMC Medical Informatics and Decision Making Volume 19 Supplement 2, 2019: Proceedings from the 4th China Health Information Processing Conference (CHIP 2018). The full contents of the supplement are available online at URL. https://bmcmedinformdecismak.biomedcentral.com/articles/supplements/volume-19-supplement-2.

Author information

RYF leaded the method design and participated in result analysis and paper revision. FH participated in data preprocessing, experiment design, result analysis, and manuscript revision. LXH, JDH and CM participated in method design, result analysis, and manuscript revision. All authors read and approved the final manuscript.

Correspondence to Xiaohui Liang.

Ethics declarations

Ethics approval and consent to participate

Not applicable.

Consent for publication

Not applicable.

Competing interests

The authors declare that they have no competing interests.

Publisher’s Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Rights and permissions

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License(http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver(http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

Reprints and Permissions

About this article

Verify currency and authenticity via CrossMark

Cite this article

Ren, Y., Fei, H., Liang, X. et al. A hybrid neural network model for predicting kidney disease in hypertension patients based on electronic health records. BMC Med Inform Decis Mak 19, 51 (2019) doi:10.1186/s12911-019-0765-4

Download citation

Keywords

  • Disease prediction
  • Neural network
  • Electronic health records
  • Long short-term memory
  • Kidney disease