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Different hydration methods for the prevention of contrast-induced nephropathy in patients with elective percutaneous coronary intervention: a retrospective study

BMC Cardiovascular Disorders volume 23, Article number: 323 (2023) Cite this article

Abstract

Background

Hydration is currently the main measure to prevent contrast-induced nephropathy (CIN). We aimed to compare the preventive effect of preprocedure and postprocedure hydration on CIN in patients with coronary heart disease undergoing elective percutaneous coronary intervention (PCI).

Methods

A retrospective study included 198 cases of postprocedure hydration and 396 cases of preprocedure hydration using propensity score matching. The incidence of CIN 48 h after PCI and adverse events within 30 days after contrast media exposure were compared between the two groups. Logistic regression analysis was used to analyse the risk factors for CIN.

Results

The incidence of CIN in the postprocedure hydration group was 3.54%, while that in the preprocedure hydration group was 4.8%. There was no significant difference between the two groups (p = 0.478). Multivariate logistic regression analysis showed that diabetes mellitus, baseline BNP and cystatin C levels, and contrast agent dosage were independent risk factors for CIN. There was no significant difference in the incidence of major adverse events between the two groups (3.03% vs. 2.02%, p = 0.830).

Conclusions

Postprocedure hydration is equally effective compared to preoperative hydration in the prevention of CIN in patients with coronary heart disease undergoing elective PCI.

Peer Review reports

Introduction

Coronary angiography (CAG) is the commonly used diagnostic method for coronary heart disease (CHD), and percutaneous coronary intervention (PCI) is one of the most effective treatments for severe CHD. In recent years, with the increase in the number of PCIs and the improvement of PCI techniques, the treatment of complex coronary lesions and chronic total occlusion (CTO) is not a difficult problem. However, it is inevitable to use contrast media (CM) in percutaneous coronary intervention, especially for complicated coronary lesions and CTO, and more CM is needed. Contrast-induced nephropathy (CIN) was defined as the elevation of serum creatinine ≥ 0.5 mg/dl (44 μmol/l) or a more than 25% increase above baseline 48–72 h after exposure to CM [1]. CIN is a common cause of hospital-acquired acute renal insufficiency, which leads to increased mortality, hospitalization expenses and prolonged hospitalization time. Once CIN occurs, there is no specific treatment, so the goal is prevention. The single most important measure to reduce the incidence of CIN is hydration [1]. There are several specific hydration strategies, such as intravenous normal saline, sodium bicarbonate, the Guard System and haemodynamic guidance. Although researchers have not yet established an optimal strategy, experts generally suggest that hydration should be based on the intravenous administration of normal saline because no significant advantages have been demonstrated for other solutions [2, 3]. Guidelines and consensus suggest that 1 ml/kg/h (0.5 ml/kg/h if  LVEF ≤ 35%) saline should be maintained 4–12 h before PCI and sustained 6–24 h after PCI [4, 5]. Preprocedure hydration time is adequate for inpatients; however, it is limited for emergency PCI patients and outpatients. Furthermore, classic hydration is inconvenient for patients and inaccurate for CIN prevention. To our knowledge, we have not found any studies comparing the effect of standard hydration and postprocedure hydration on CIN prevention.

The purpose of this retrospective study was to compare the effect of preprocedure standard hydration versus postprocedure hydration on the prevention of CIN in patients with CHD undergoing elective PCI.

Methods

Study population

This study was a single-centre, retrospective, observational study. From November 2014 to November 2017, 1,323 consecutive patients from the Second Hospital of Hebei Medical University who underwent elective PCI were enrolled. There were 1,123 patients in the standard hydration group and 200 patients in the postprocedure hydration group. Using the statistical method of propensity score-matched analysis (PSM), the postprocedure hydration group was matched with the preprocedure hydration group by 1:2 according to the sex and age of the patients. There were 198 cases in the postprocedure hydration group who matched 396 cases in the preprocedure hydration group, and two cases failed (Fig. 1). The data come from a clinical study of our centre registered in the Chinese Clinical Trial Registry. The serial number was ChiCTR-IOR-14005250.

Fig. 1
figure 1

Flow diagram of the study group selection process

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The selected patients underwent interventional therapy via the radial artery or femoral artery. Low osmolar contrast media (including iopromide, iohexol and iodofol) were used during the operation. The patients were anticoagulated with unfractionated heparin (70–100 U/kg) or bivalirudin during the procedure and treated with dual antiplatelet therapy (aspirin combined with clopidogrel or ticagrelor). All patients were treated with hydration. The preprocedure standard hydration group received an intravenous infusion of 0.9% saline at a rate of 1 or 0.5 mL/kg/h (patients with LVEF ≤ 35%) 4 h before and 20 h after elective PCI. Postprocedure hydration group: 0.9% normal saline was given immediately after PCI, and the hydration rate was the same as above, maintained until 24 h after PCI. The inclusion criteria were as follows: age 18–75 years old, regardless of sex, elective PCI, and signed informed consent. Exclusion criteria: emergency PCI, recently used contrast medium (within two days), contrast medium allergy, renal replacement therapy, acute decompensated heart failure, severe heart valve disease, after heart or kidney transplantation.

Variables and study endpoint

The baseline clinical data and laboratory examination of 198 patients in the postprocedure hydration group and 396 patients in the standard hydration group were collected, including body mass index (BMI), left ventricular ejection fraction (LVEF), haemoglobin, glycosylated haemoglobin, low-density lipoprotein cholesterol (LDL-C), past medical history (hypertension, diabetes, hyperlipidaemia, old myocardial infarction, smoking, etc.) and combined medication (statins, angiotensin-converting enzyme inhibitors/angiotensin receptor blockers, etc.

The serum creatinine (sCr), serum urea nitrogen (BUN), estimated glomerular filtration rate (eGFR), B-type natriuretic peptide (BNP), cystatin-C, and ß2-microglobulin (ß2-MG) levels at baseline and 48 h after CM exposure were compared between the two groups. The biochemical parameters were measured by an automatic biochemical analyser (Hitachi 7600, Japan), and BNP levels were measured using commercially available BNP assay kits. The eGFR was calculated by serum creatinine (SCr) levels and the following modification: eGFR (mL/min/1.73 m2) = 186 × sCr-1.154 × age-0.203 (× 0.742 for females).

The incidence of CIN and major adverse events after CM exposure was compared between the two groups. CIN was defined as a 25% relative increase in SCr from baseline or an absolute increase of 44 µmol/L or 0.5 mg/dL after exposure to CM [1]. Major adverse events occurring within 30 days after CM exposure were recorded, including all-cause death, myocardial infarction, renal failure requiring dialysis, upper gastrointestinal bleeding, and stroke. All patients were followed in an outpatient clinic or contacted by telephone.

Statistical analysis

Continuous variables were expressed as the means with standard deviation for normally distributed variables and as median with interquartile range for nonnormally distributed variables. Categorical variables are presented as percentages. Continuous variables were compared using Student’s t test for normally distributed values and the Mann–Whitney U test for nonnormally distributed values. Proportions were compared using the Chi-square test, and if the expected frequency was < 5, the Fisher exact test was applied. The variables with statistical significance in univariate analysis and those professionally considered to have an impact on the outcome were included in the multivariate logistic regression model to explore the independent influencing factors of the outcome, and the test level was 0.05. Multivariate logistic regression analysis was used to explore the independent risk factors for CIN. For the bilateral test, P < 0.05, the difference was considered statistically significant.

Result

Clinical characteristics

There were no significant differences (all P > 0.05) between the two groups in baseline clinical characteristics. Although the amount of CM used in the postprocedure hydration group was greater than that in the preprocedure hydration group (155.25 ± 56.66 mL vs. 147.96 ± 62.42 mL), there was no statistically significant difference (P = 0.563). Meanwhile, the difference in left ventricular end-diastolic pressure between the two groups was not statistically significant (P > 0.05) (Table 1).

Table 1 Baseline clinical characteristics of the patients
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Changes in renal function parameters and incidence of CIN

There was no significant difference in the baseline levels of renal function parameters (sCr, eGFR and Cys-C) between the postprocedure hydration and preprocedure hydration groups (all P > 0.05). The sCr and Cys-C levels were increased, and the eGFR levels were decreased at 48 h after PCI compared with baseline in both groups (all P < 0.05). However, there was no significant difference in sCr, eGFR and Cys-C levels at 48 h after PCI between the two groups (all P > 0.05). Meanwhile, there was no statistically significant difference in the incidence of CIN between the two groups (3.54% vs. 4.8%, P = 0.478) (Table 2, Fig. 2).

Table 2 Changes in sCr, eGFR and Cystatin-C, incidence of CIN
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Fig. 2
figure 2

Incidence of CIN between the two groups

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Multifactor logistic regression analysis of the predictors of CIN

Univariate analysis was performed to determine whether there were significant differences between the CIN and non-CIN groups in baseline clinical factors, including age, sex, body mass index (BMI), left ventricular ejection fraction (LVEF), B-type natriuretic peptide (BNP), blood creatinine (sCr), glomerular filtration rate (eGFR), and contrast agent dosage. The results showed that the differences between the two groups were statistically significant (P < 0.05) for diabetes mellitus, BNP and cystatin C levels, contrast media dosage, and BMI, while the differences between the two groups were not statistically significant (P > 0.05) for the remaining indicators (Table 3).

Table 3 Comparison of clinical characteristics between CIN and non-CIN patients
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Meanwhile, multivariate logistic regression was used to analyse the independent risk factors associated with the incidence of CIN. The results showed that the predictors of CIN were diabetes (OR = 5.01, 95% CI 2.04–12.35, P < 0.001), baseline BNP (OR = 1.003, 95% CI 1.001–1.004, P = 0.001), baseline cystatin C (OR = 17.48, 95% CI 3.61–84.74, P < 0.001), and CM dosage (OR = 1.009, 95% CI 1.004–1.014, P = 0.001), whereas BMI was not significantly associated with the incidence of CIN (P = 0.197) (Table 4).

Table 4 Multivariate logistic regression analysis of risk factors for the development of CIN
Full size table

Clinical follow-up

The 30-day clinical follow-up revealed no significant difference in the incidence of major adverse events between the two groups (3.03% vs. 2.02%, P = 0.830). Five patients in the postprocedure hydration group were readmitted with acute coronary syndrome; one person developed stroke. Six people in the control group were readmitted with acute coronary syndrome events, one with myocardial infarction, and one with upper gastrointestinal bleeding. There were no deaths in either group during the follow-up period, and no patients had progressive renal insufficiency requiring dialysis.

Discussion

Contrast-induced nephropathy (CIN) is a medically induced kidney injury that occurs 48–72 h after the application of contrast media and causes a significant increase in blood creatinine, which in severe cases may result in acute kidney injury [6]. The pathophysiological mechanisms of CIN have not been fully investigated. It is generally considered to be related to direct or indirect toxicity of the CM to the kidney tissues and its influence on haemodynamics. Contrast agents are directly toxic to renal tubular epithelial cells, causing apoptosis and necrosis. Moreover, the indirect mechanism is ischaemic-hypoxic injury caused by reduced renal perfusion, haemodynamic disorders, and release of vasoactive factor's endothelin, nitric oxide, and prostaglandins [7,8,9].

The kind and amount of contrast agent used for the procedure, as well as the patient's underlying illness, all influence the risk of CIN. A variety of indicators can help us anticipate and identify people who are at high risk of developing CIN so that we can take preventative actions before it happens [10, 11]. The presence of chronic kidney disease in patients prior to PCI was a significant risk factor for the incidence of CIN, with the worsening of kidney function increasing the risk of CIN [12]. A retrospective study analysing data from 985,737 patients undergoing percutaneous coronary intervention (PCI) confirmed that severe chronic kidney disease is an independent risk factor for CIN [13]. Furthermore, the rate of CIN following PCI is significantly high in patients with chronic renal disease, ranging from 10 to 20% [9], while the patients enrolled in our study with normal renal function had a low incidence of CIN of approximately 4%. Diabetes and heart failure (low ejection fraction) have been shown to be independent predictors of CIN, and patients with diabetes and/or heart failure are more likely to have chronic kidney damage [14, 15]. It was found that cystatin C is more sensitive to detect early acute kidney injury compared to serum creatinine (sCr) [16], and cystatin C generally peaks within 24 h after contrast exposure. Carlo Briguori et al. [17] showed that cystatin C aids in the early detection of CIN and assesses its prognosis. Hypotonic (iopromide, iohexol, iophorol, etc.) and isotonic (iodixanol) contrast agents reduce renal injury and can result in a significantly lower risk of CIN compared to early hyperosmotic contrast agents (pantethine) [18]. It has been shown that the occurrence of CIN is closely related to the amount of contrast agent used and that the application of excessive amounts of contrast agent (more than 350 mL or 4 mL/kg) and repeated applications of contrast agent within 72 h can significantly increase the incidence of CIN [19, 20]. This is consistent with the results of the present study, in which the contrast dosage was significantly higher in the CIN group than in the non-CIN group (198.46 ± 47. 89 mL vs. 149.59 ± 62.67 mL, P < 0.01), and contrast dose was one of the independent predictors of CIN. In addition, there is also evidence that the disease's clinical manifestation is linked to renal damage; for example, acute ST-segment elevation myocardial infarction (STEMI) with primaryPCI (PPCI) raises the risk of CIN [21]. CIN is associated with high mortality and morbidity and long hospital stay in patients with STEMI. And acute kidney injury (AKI) has been demonstrated in a prior study to be an independent predictor of long-term mortality in STEMI patients receiving PPCI [22]. The prediction of CIN is very important in patients with STEMI thus several parameters have been proposed to predict adverse events in these patients. Yildiz I et al. [23] found that serum osmolarity can be useful to define patients with STEMI undergoing PPCI who are more likely to develop CIN. Other studies revealed that Syntax Score II and Platelet-to-Lymphocyte Ratio were independent predictors of CIN in STEMI patients treated with PPCI [24, 25].

There are many relevant CIN prevention measures, including the application of hypotonic or isotonic contrast agents, reduction of contrast agent dosage, avoidance of coadministration of nephrotoxic drugs, and prophylactic application of antioxidant and anti-inflammatory drugs (N-acetylcysteine, statins, etc.) [26,27,28,29], while clinical volume expansion (hydration) to maintain renal perfusion is considered the cornerstone of CIN prevention [1]. Hydration strategies are currently recommended by national and international guidelines and expert consensus for CIN prevention and treatment [5]. Recent studies have shown that hydration reduces the incidence of CIN after PCI for acute ST-segment elevation myocardial infarction. Two studies enrolled 216 and 408 patients with ST-segment elevation myocardial infarction undergoing PCI, and the hydration regimen was saline 0.5–1 mL/kg/h maintained from 12 h before to 12 h after PCI. The results of the studies showed a 35% and 48% reduction in the incidence of CIN in the hydration group; moreover, a significant reduction in adverse events such as in-hospital dialysis and death were observed [30, 31]. A meta-analysis of seven clinical trials enrolling a total of 2,851 patients found that prophylactic hydration reduced the risk of CIN and all-cause mortality but not dialysis events [32]. Except for standard normal saline hydration, are there any other alternative solutions we can choose? In 2004, a small clinical trial [33] enrolled 119 patients randomized to a sodium bicarbonate hydration group and a sodium chloride hydration group to observe the incidence of CIN after contrast application, and the results showed that the incidence of CIN in the sodium bicarbonate hydration group showed a significant reduction in the incidence of CIN compared to the control group (1.7% vs. 13.6%, P = 0.02). The researchers predicted that sodium bicarbonate may protect the renal medulla from oxidative stress damage by scavenging oxygen-free radicals. However, numerous clinical studies, including meta-analyses, have not demonstrated the superiority of sodium bicarbonate hydration [34]. A recent large-scale clinical trial (PRESERVE) [35] enrolled 5,177 patients with renal insufficiency or diabetes mellitus undergoing contrast examination and showed no significant difference in the incidence of CIN and 90-day adverse events between the sodium bicarbonate hydration and sodium chloride hydration groups. Are there more convenient methods of hydration? A clinical study randomized 225 patients at high risk of developing CIN with coronary angiography into an isotonic sodium chloride hydration group versus an oral hydration group and found no significant difference in the incidence of CIN between the two groups (6.9% vs. 7.3%, P = 0.89) [36]. Another meta-analysis [37] found no significant difference in the prevention of CIN between oral and intravenous hydration, with all patients having an eGFR greater than 30 mL/min/1.73m2. Although oral hydration appears to give more protection than intravenous hydration, the preventative effect of CIN in individuals with chronic renal disease is unclear [38]. Our research revealed another convenient method of saline hydration, and the results showed that postprocedure hydration was as effective as standard hydration in preventing CIN (3.54% vs. 4.8%, P = 0.478). Meanwhile, there was no significant difference in the incidence of major adverse events between the two groups (3.03% vs. 2.02%, P = 0.830).

No consensus has been reached on a precise hydration strategy. The American College of Radiology guidelines recommend 100 mL/h of intravenous isotonic saline from 6 to 12 h before angiography until 4 to 12 h following angiography [4]. The European Society of Cardiology (ESC) guidelines for myocardial revascularization recommend a regimen of intravenous isotonic saline (1–1.5 mL/kg/h) from 12 h before until 12 h after the procedure [5]. According to KDIGO recommendations [39], hydration at a rate of 1 to 1.5 mL/kg/h for 3 to 12 h before contrast exposure is recommended, followed by sustained hydration for 6 to 12 h with a goal urine volume of > 150 mL/h. There is still sufficient hydration time for patients undergoing elective coronary angiography or PCI, but there is no clear agreement on how to adjust the hydration regimen for patients who do not have time to hydrate, such as those undergoing emergency PCI. Furthermore, to our knowledge, there are no clinical studies or reports on whether a single postprocedure hydration strategy is as effective as standard hydration in patients undergoing elected PCI. In this retrospective study, 198 postprocedure hydration cases were successfully matched with 396 preprocedure hydration patients using propensity-matched statistics, and the results showed that postprocedure hydration was comparable to preprocedure hydration in the prevention of CIN in patients undergoing elected PCI for coronary heart disease (3.54% vs. 4.8%, P = 0.478). The results of our study were similar to the oral hydration mentioned above [36, 37]. We predicted that postoperative hydration may also have an effective volume expansion, which can decrease the incidence of CIN. Our study contributes to the simplification of the hydration protocol and has important clinical significance and broad clinical application prospects.

In terms of clinical follow-up, the low incidence of serious adverse events and the absence of patients with death and progression to dialysis events in this study might be due to the following factors: all patients enrolled in this study underwent routine hydration; the recruited cohort was at low risk of CIN (baseline blood creatinine values and left cardiac function, mainly normal); and fewer patients with complex PCI were enrolled in this study.

Limitations

There are some limitations in this study. First, our study is a retrospective study with study population limitation and many confounding factors, and further prospective randomized controlled clinical trials with large study population are needed to confirm the findings of this study. Second, most of the patients enrolled in this study were at low risk of CIN and had normal baseline renal function, and there were few patients with severe renal insufficiency. Further enrolments of patients with combined chronic renal insufficiency and elevated baseline creatinine are needed to clarify the preventive effect of postprocedure hydration in the high-risk group of CIN. Again, the use of hypotonic contrast agents in this investigation, with no restrictions on the kind or brand of contrast agents, may have influenced the findings.

Conclusion

In conclusion, we demonstrated that postprocedure hydration was as effective as standard hydration in the prevention of CIN in patients with coronary heart disease undergoing elective PCI. These patients may have potential benefits from the simplified hydration method.

Availability of data and materials

Data relevant to this study are available from the corresponding authors upon reasonable request.

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Acknowledgements

None.

Funding

This work was supported by the Government Funded Provincial Clinical Medicine Talents Project.

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Authors and Affiliations

  1. Department of Cardiology, the Second Hospital of Hebei Medical University and the Institute of Cardiocerebrovascular Disease of Hebei Province, Shijiazhuang, 050000, China

    Fei Chen, Jingchao Lu, Xiuchun Yang, Demin Liu, Qian Wang, Xue Geng, Bing Xiao, Jie Zhang, Fan Liu, Guoqiang Gu & Wei Cui

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  3. Xiuchun Yang
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  4. Demin Liu
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  5. Qian Wang
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  9. Fan Liu
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  10. Guoqiang Gu
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  11. Wei Cui
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Contributions

Substantial contributions to the conception and design of the study (WC, FL); data collection (JCL, XCY, GQG, DML, QW); data analysis and/or interpretation of data for the work (JZ, XG); drafting of the work or revising it critically for important intellectual content (FC, BX); final approval of the version to be published (all the authors). All authors read and approved the final manuscript.

Corresponding author

Correspondence to Wei Cui.

Ethics declarations

Ethics approval and consent to participate

The study was approved by the Research Ethics Committee of the Second Hospital of Hebei Medical University (No. 2016222). All the patients enrolled in the study signed written informed consent. All steps/methods were performed in accordance with the relevant guidelines and regulations.

Consent for publication

Not applicable.

Competing interests

The authors declare no competing interests.

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Chen, F., Lu, J., Yang, X. et al. Different hydration methods for the prevention of contrast-induced nephropathy in patients with elective percutaneous coronary intervention: a retrospective study. BMC Cardiovasc Disord 23, 323 (2023). https://doi.org/10.1186/s12872-023-03358-w

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  • DOI: https://doi.org/10.1186/s12872-023-03358-w

Keywords

BMC Cardiovascular Disorders

ISSN: 1471-2261

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