Role of Lipid Profile and Its Relative Ratios (Cholesterol/HDL-C, Triglyceride/HDL-C, LDL-C/HDL-C, WBC/HDL-C, and FBG/HDL-C) on Admission Predicts In-Hospital Mortality COVID-19

Mohammadshahi, Jafar; Ghobadi, Hassan; Matinfar, Golchin; Boskabady, Mohammad Hossein; Aslani, Mohammad Reza

doi:https://doi.org/10.1155/2023/6329873

Journal of Lipids

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Abstract Introduction Results Discussion Conclusions Data Availability Ethical Approval Conflicts of Interest Authors’ Contributions Acknowledgments References Copyright Related Articles

Research Article | Open Access

Volume 2023 | Article ID 6329873 | https://doi.org/10.1155/2023/6329873

Role of Lipid Profile and Its Relative Ratios (Cholesterol/HDL-C, Triglyceride/HDL-C, LDL-C/HDL-C, WBC/HDL-C, and FBG/HDL-C) on Admission Predicts In-Hospital Mortality COVID-19

Jafar Mohammadshahi,¹Hassan Ghobadi,²Golchin Matinfar,³Mohammad Hossein Boskabady,⁴and Mohammad Reza Aslani^2,4

Academic Editor: Xian-Cheng Jiang

Received03 Oct 2022

Revised04 Feb 2023

Accepted22 Feb 2023

Published06 Mar 2023

Abstract

Background. Lipid profile and its related ratios such as total cholesterol (TC), low-density lipoprotein-cholesterol (LDL-C), triglyceride (TG), high-density lipoprotein-cholesterol (HDL-C), TG/HDL-C ratio, TC/HDL-C ratio, LDL-C/HDL-C ratio, white blood cell (WBC)/HDL-C ratio, and fasting blood glucose (FBG)/HDL-C ratio are valuable indicators that have been studied in various disorders to predict mortality. The present study was conducted with the aim of investigating the role of lipid profile ratios in predicting mortality in COVID-19 patients. Methods. At the beginning of hospitalization, laboratory tests were taken from all patients (). The ability of lipid profile ratios to determine the COVID-19 severity was evaluated using receiver-operating characteristic (ROC). In addition, survival probability was determined with the average of Kaplan-Meier curves, so that the end point was death. Results. In deceased patients, TG, TC, LDL-C, HDL-C, TC/HDL-C, TG/HDL-C, and LDL-C/HDL-C parameters were significantly lower than those of surviving patients, while WBC/HDL-C and FBG/HDL-C were significantly higher. TC (, to 9.491, ), TG (, to 9.655, ), LDL-C (, to 9.316, ), and HDL-C (, to 10.554, ), as well as TC/HDL-C (, to 11.558, ), TG/HDL-C (, to 11.558, ), LDL-C/HDL-C (, to 11.739, ), WBC/HDL-C (, to 8.885, ), and FBG/HDL-C ratios (, to 12.777, ), were detectably related to survival. The multivariate Cox regression models showed that only FBG/HDL-C ratio (, to 20.153, ) was significantly related to survival. Conclusion. The results suggested that FBG/HDL-C ratio in hospital-admitted COVID-19 patients was a reliable predictor of mortality.

1. Introduction

It has been revealed that mortality in patients with coronavirus disease 2019 (COVID-19) is related to increased inflammation and impaired immune response [1]. Many evidences showed that although most hospitalized patients with COVID-19 are mild, critically ill patients have a high mortality rate due to the development of multiorgan failure, acute respiratory disease, and septic shock [2]. Severity and morbidity in COVID-19 patients have been more evident in comorbidities such as cardiovascular disease, lung disease, diabetes, and kidney failure [3]. On the other hand, disturbance in lipid metabolism has been shown in the pathophysiology of many disorders such as cardiovascular, respiratory, and metabolic syndrome [4–8]. Defective lipid metabolism has also been reported in the COVID-19 [2]. Decreased levels of lipid profiles such as triglyceride (TG), total cholesterol (TC), high-density lipoprotein-cholesterol (HDL-C), and low-density lipoprotein-cholesterol (LDL-C) have been reported in COVID-19 patients, especially in severe patients [9, 10]. Dyslipidemia has also been evident in various system injuries such as cardiovascular, immune, and respiratory systems. In addition, high levels of proinflammatory cytokines are also important factors in developing dyslipidemia [11]. Due to the nature of COVID-19 (increased levels of proinflammatory cytokines and damage to various organs), lipid regulation is impaired.

In predicting the outcome of COVID-19, the use of various indicators has been investigated, such as systemic inflammation indexes [3]. On the other hand, lipid profile and related ratios such as TG/HDL-C, TC/HDL-C, and LDL-C/HDL-C, as well as white blood cell count (WBC)/HDL-C and first blood glucose (FBG)/HDL-C ratios in diagnosing severity and mortality of diseases, have been evaluated in various studies [12–14]. Therefore, the present study is aimed at investigating the predictive mortality in COVID-19 patients based on lipid profile ratios.

2. Method

This retrospective study was conducted in Ardabil Imam Khomeini Hospital, Ardabil, Iran, from July to September 2021. COVID-19 patients whose diagnosis was based on PCR test were included in the study. The study was conducted after it was approved by the Ethics Committee of Ardabil University of Medical Sciences (IR.ARUMS.MEDICINE.REC.1400.014).

The data collected included age, sex, medical history, laboratory tests, comorbidities, clinical symptoms, length of hospitalization, and disease outcome (recovery or death) of 300 COVID-19 patients by two trained medical students. The laboratory tests that were obtained from the patients in the first 24 hours, such as total white blood cell (WBC), neutrophil (NT), lymphocyte (LY), monocyte (MN), and platelet (Plt) counts, as well as hematocrit (Hct), hemoglobin (Hb), partial thromboplastin time (PTT), prothrombin time (PT), international normalized ratio (INR), fasting blood glucose (FBG), alkaline phosphatase (ALP), alanine transaminase (ALT), AST, erythrocyte sedimentation rate (ESR), D-dimer, lactate dehydrogenase (LDH), ferritin, urea, creatinine (Cr), sodium (Na), potassium (K), triglyceride (TG), low-density lipoprotein-cholesterol (LDL-C), total cholesterol (TC), and high-density lipoprotein-cholesterol (HDL-C), were analyzed.

In addition, lipid profile ratios were also calculated for all subjects, including TC/HDL-C ratio, TG/HDL-C ratio, LDL-c/HDL-C ratio, WBC/HDL-C ratio, NT/HDL-C ratio, LY/HDL-C ratio, MN/HDL-C ratio, and FBG/HDL-C ratio.

2.1. Data Analysis

For variables with normal distribution, and, for variables abnormally distributed, median values and interquartile range (IQR) were used. Independent group -test or Mann–Whitney test was used to compare variables. According to the Youden index, receiver-operating characteristic (ROC) curve analysis was conducted to estimate optimal values of cutoff, as well as to maximize sensitivity and specificity. Time zero in the current study was defined as the time of hospitalization for survival analysis. In order to avoid linear bias with univariate analysis for Charlson’s index, lipid profile ratios were evaluated separately so that in case of , confounding factors were corrected. The probability of survival was estimated for the lipid profile ratios with the end point of death using the mean of the Kaplan-Meier curves. Finally, the Cox proportional hazards regression was used for both univariate and multivariate analysis. Data analysis was done by MedCalc version 19.4.1 and SPSS software.

3. Results

In the current study, 300 patients with COVID-19 were included, with an average age of (Table 1). The percentage of hospitalized men (58.7%) was higher than that of women (41.3%). The average hospital stay was days.

Laboratory findings of total WBC, Hb, Hct, Plt, PT, PTT, INR, Cr, Na, and K were in the normal range. However, ALT, AST, LDH, ferritin, ESR, urea, D-dimer, FBG, and ALP were higher than the normal range, while lymphocytes were less. The levels of lipid profiles measured at the beginning of hospitalization of the patients were TC: , TG: , LDL-C: , and HDL-C: (Table 1).

3.1. Clinical Outcomes

The COVID-19 severity in 14 patients (4.7%) was very severe, in 61 patients (20.3%) severe, and in 225 patients (75%) moderate. Interestingly, it was revealed that the lipid profile (TG, TC, HDL-C, and LDL-C) was significantly lower in very severe and severe compared to moderate patients (both, ) (Figure 1). Out of three hundred patients, 274 (91.3%) were discharged, and 26 died (8.7%).

(a)

(b)

3.2. Laboratory Finding Based on Outcome

The results showed that the following parameters were detectably higher in the dead than in the surviving patients: hospitalization stay (), age (), total WBC (), ALT (), AST (), ferritin (), FBG (), urea (), Cr (), and ALP (). On the other hand, the lymphocyte count in deceased patients was significantly lower than in surviving patients ().

The results of lipid profile and related ratios revealed that in patients who died compared to those who recovered, decreased levels occurred such as TC, TG, LDL-C, HDL-C, LDL-C/HDL-C ratio, TG/HDL-C ratio, and Lymphocyte/HDL-C ratio (for all ) (Table 2). Interestingly, WBC/HDL-C and FBG/HDL-C ratios were significantly higher in deceased patients (both, ). In addition, the analysis of the results revealed that the FBG/HDL-C ratio was not significantly different between male and female.

3.3. Receiver-Operating Characteristics (ROC)

In the ROC-based analysis for survival assessment, the optimal cut-off values identified for lipid profile and its ratios were as follows: TC (≤123.97), TG (≤111.47), LDL-C (≤60.41), HDL-C (≤42.35), TG/HDL-C ratio (≤2.74), TC/HDL-C ratio (≤2.99), LDL-C/HDL-C ratio (≤1.45), WBC/HDL-C ratio (>169.64), lymphocyte/HDL-C ratio (≤27.88), monocyte/HDL-C ratio (≤4.72), and FBG/HDL-C ratio (>3.42) (Figure 2 and Table 3). In addition, AUD level was significant for TC (0.864), TG (0.870), LDL-C (0.867), HDL-C (0.865), TC/HDL-C ratio (0.864), TG/HDL-C ratio (0.868), LDL-C/HDL-C ratio (0.867), WBC/HDL-C ratio (0.860), lymphocyte/HDL-C (0.644), monocyte/HDL-C ratio (0.619), and FBG/HDL-C ratio (0.866) (Figure 2 and Table 3). The results revealed that AUC values were significantly higher for TC/HDL-C, TG/HDL-C, LDL-C/HDL-C, WBC/HDL-C, and FBG/HDL-C ratios than LM/HDL-C and MN/HDL-C ratios.

The results of the Kaplan-Meier survival curves indicated that low survival was evident with low values of TC (, to 9.491, ), TG (, to 9.655, ), LDL-C (, to 9.316, ), HDL-C (, to 10.554, ), TC/HDL-C ratio (, to 11.558, ), TG/HDL-C ratio (, to 11.558, ), LDL-C/HDL-C ratio (, to 11.739, ), WBC/HDL-C ratio (, to 8.885, ), MN/HDL-C (, to 6.434, ), and FBG/HDL-C ratio (, to 12.777, ) (Figure 3 and Table 4). The multivariate Cox regression models showed that only FBG/HDL-C ratio (, to 20.153, ) was significantly related to survival.

4. Discussion

In summary, the findings of the current study in COVID-19 patients were as follows: (1)In deceased patients, the values of TG, TC, LDL-C, and HDL-C levels, as well as TC/HDL-C, LDL-C/HDL-C, TG/HDL-C, LM/HDL-C, and MN/HDL-C ratios, were significantly less, but WBC/HDL-C and FBG/HDL-C ratios were higher than recovered subjects(2)The ROC and Kaplan-Meier survival curves identified that lipid profile (TC, TG, LDL-C, and HDL-C) and its related ratios (TC/HDL-C, TG/HDL-C, LDL-C/HDL-C, WBC/HDL-C, LM/HDL-C, MN/HDL-C, and FBG/HDL-C) were detectably related to survival(3)Only FBG/HDL-C ratio was significantly related to survival based on the multivariate Cox regression model

Various studies have shown that one of the characteristics of COVID-19 and its associated mortality is immune system dysfunction and severe inflammatory response [15, 16]. Systemic inflammation, sepsis, and metabolic disorders have been reported in severe COVID-19 [17]. Lipid metabolism disruption has been shown to affect the severity of COVID-19 [18]. As a result, it is believed that the disruption of the quantity and activity of the lipid profile may affect mortality due to COVID-19. Considerable evidence has shown that altered levels of lipid profiles, although contradictory, have been evident in COVID-19 patients [2, 12]. In most studies, reduced LDL-C, HDL-C, and TC levels have been reported in patients with COVID-19, especially in severe and critically ill patients [19]. The change in lipid profile levels in viral infections (such as dengue (DENV), Helicobacter pylori infection, sepsis, human immunodeficiency (HIV), nosocomial infections, and hepatitis B viruses (HBV)) has been considered an indicator of disease prognostics [9]. The prognostic role of various biomarkers in predicting the outcome of the disease has been discussed in COVID-19 patients [3].

In line with other studies, increased levels of leukocytes, AST, ALT, FBG, ALP, and urea were evident in deceased patients compared to recovered patients [3]. Interestingly, reduced TG, TC, LDL-C, and HDL-C levels were also observed in deceased patients. Compared with mild COVID-19, reduced levels of lipid profiles have been shown in the severe and mortality groups [20–22]. In COVID-19 patients hospitalized in ICU, it has also been demonstrated that reduced levels of HDL were associated with high mortality [23].

Cholesterol plays an important role in SARS-CoV-2 infection through interaction with SARS-CoV-19 S protein [24]. In addition, it has been found that HDL-C exerts an important role in host defense against viral, parasitic, and bacterial infections through anti-inflammatory effects [9]. The anti-inflammatory effects of HDL-C have been revealed by reducing the activity of T-cells and the expression level of inflammatory factors in macrophages, inhibiting the activation of monocytes and the expression of adhesion molecules (such as vascular cell adhesion molecule 1 (VCAM-1), intercellular adhesion molecule 1 (ICAM-1), E-selectin, and P-selectin) [25–27]. In addition, other effects observed in relation to HDL-C are as follows: antiapoptotic, antioxidative, antiviral, and antithrombotic effects [9]. However, the HDL-C beneficial effects can be impaired in inflammatory conditions [28]. Proinflammatory cytokines such as CRP and IL-6 can reduce HDL-C production by inhibiting apolipoprotein synthesis enzyme activity [29]. It seems that in SARS-CoV-2 infection, lipid profile changes affect the severity of the disease, which requires additional investigations.

The current study also decreased levels of LDL-C, TC, and TG. Low TG, TC, and LDL-C levels are observed which could be considered malnutrition markers [30]. In addition, it has also been shown that inflammation leads to lower LDL-C levels [2]. In the current study, hypocholesterolemia appears to be a result of malnutrition or the cytokine storm caused by SARS-CoV-2 infection.

Recently, lipid profile ratios have been used in various studies as predictors of the outcome of diseases [12, 31]. Decreased TG/HDL-C, TC/HDL-C, LDL-C/HDL-C, LM/HDL-C, and MN/HDL-C ratios and increased WBC/HDL-C and FBG/HDL-C ratios were markedly observed in the mortality group. In addition, it was identified that survival was related to TC, TG, HDL-C, and LDL-C levels, as well as TC/HDL-C, TG/HDL-C, LDL-C/HDL-C, LM/HDL-C, MN/HDL-C, WBC/HDL-C, and FBG/HDL-C ratios. On the other hand, LM/HDL-C and MN/HDL-C ratios were the lowest in predicting disease severity. Multivariate Cox regression analysis identified that only FBG/HDL-C ratio remained significant with survival. Much evidence has reported that comorbidities such as cardiovascular, diabetes, and kidney diseases have affected the severity of COVID-19 [3]. Hyperglycemia has been shown to exacerbate inflammatory conditions through increased inflammatory markers, oxidative stress, clotting factors, and LDL glycation [12, 32, 33]. It can be concluded that the increase in FBG and the decrease in HDL-C levels in patients with COVID-19 were more significant in predicting mortality than other ratios of lipid profile.

The limitations of the study were as follows: (1) selection of patients from one center, (2) the data were collected from the electronic record system, (3) difference in the severity of the disease during hospitalization, (4) the possibility of the effects of different variants of the results, and (5) sample size limitation.

5. Conclusions

In conclusion, the results showed that lipid profile ratios were valuable in diagnosing COVID-19 severity. The FBG/HDL-C ratio among lipid profile ratios had a higher power of predicting COVID-19 mortality. It seems that the use of lipid profile ratios and changes in glucose levels in SARS-CoV-2 infection is more important than other changes in predicting the mortality of patients.

Data Availability

The datasets used and/or analyzed during the current study are available upon reasonable request from the corresponding author.

Ethical Approval

The study complied with the principles of the Declaration of Helsinki and was approved by the Ethics Committee of Ardabil University of Medical Sciences (IR.ARUMS.MEDICINE.REC.1400.014).

Conflicts of Interest

The authors declare no competing interests.

Authors’ Contributions

MRA, JM, and HG were responsible for the proposal writing, literature search, data collection and analysis, interpretation of data, manuscript preparation, and review of the manuscript. MHB and GM contributed to the proposal writing, data collection and analysis, and manuscript preparation. Jafar Mohammadshahi, Hassan Ghobadi, and Golchin Matinfar contributed equally to this work and share first authorship.

Acknowledgments

The authors would like to thank the staff of Ardabil Imam Khomeini Hospital.

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Copyright © 2023 Jafar Mohammadshahi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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