Jiangyun PengI; Yinghong ZhangI; Xuan LiuI; Xue FengI; Zijun YinI; Yanhong HuI; Wen ZhangII; Jing ZhangIII; Jingping LiI
DOI: 10.21470/1678-9741-2023-0424
ABSTRACT
Introduction: The aim of this study was to identify perioperative risk factors of laryngeal symptoms and to develop an implementable risk prediction model for Chinese hospitalized patients undergoing coronary artery bypass grafting (CABG).BMI = Body mass index
CABG = Coronary artery bypass grafting
CAD = Coronary artery disease
CI = Confidence interval
CP = Cuff pressure
H-L = Hosmer-Lemeshow
ICU = Intensive care unit
LCS = Laryngeal complications
OR = Odds ratio
PCI = Percutaneous coronary intervention
ROC = Receiver operating characteristic
TEE = Transesophageal echocardiogram
INTRODUCTION
There is an increasing incidence of coronary artery disease (CAD) nationwide, and therapies for CAD have evolved, including surgeries, interventions, and medications[1]. Coronary artery bypass grafting (CABG) surgery is often considered a high-risk procedure, associated with a 30-day morbidity and mortality rate up to 14.0% and 2.0%, respectively[2]. However, postoperative complications of CABG including respiratory failure, stroke, urinary tract infections, and renal failure remain common[2].There is growing concern on the complications of laryngeal injury, including swallowing disorders (dysphagia) and voice disorders (dysphonia)[3].
Laryngeal complications (LCs) include dysphagia/aphasia, dysphonia/aphonia, and vocal cord paralysis[3], which may occur after endotracheal intubation, esophagectomy, anterior cervical spine surgery, thyroidectomy, and cardiac surgery. Several studies have shown that the occurrence of LCs is 3%-62% after extubation[4], 1.96% after esophagectomy[5], 32.4% after anterior cervical spine surgery[6], as well as the incidence in cardiac surgery ranges from 1.5 to 1.8%[3]. Specifically, the rate of LCs almost increases every year in cardiac surgery (2010-2017)[3].
Once LCs occurs, it increases the secondary complications such as pneumonia and aspiration, and then brings malnutrition, longer length of hospital stay, and higher total hospital costs[5, 7, 8]. Postoperative complications increase among patients with LC[9]. In addition, because the early clinical symptoms of patients with LCs are not easy to be found by clinicians[9] and LCs were characterized by transient dysphonia and dysphagia[10], little attention has been paid to the laryngeal consequences after CABG[10]. However, assessments of swallowing and voice function are not conducted as a routine examination[9]. It appears that clinicians should increase the awareness of post-extubation dysphagia and implement bedside screening[11]. In addition, early examination and treatment could reduce patients’ costs[8].
In recent years, major studies have focused on the risk factors of LCs and postoperative treatment among patients after neck surgery and extubation, and there are far less investigations in patients who underwent CABG. A good prediction model can help identify the risk of LCs[12], therefore, the main objective of our study was to develop a risk prediction model of LCs for Chinese patients undergoing CABG to help clinical staff screen patients with LCs and implement effective interventions.
METHODS
Sample
Our study was approved by Wuhan University of Science and Technology (22Z107). Data were collected from patients who underwent CABG from January 2020 to June 2022 in Wuhan Asian Heart Hospital affiliated to Wuhan University of Science and Technology. Inclusion criteria were patients aged ≥ 18 years and patients who underwent CABG. Exclusion criteria were patients with incomplete data and patients with previous history of laryngeal problems. Among 1476 cases, 844 patients from January 2020 to June 2021 were used as the derivation cohort, while 632 patients from July 2021 to June 2022 were used as the validation cohort. Our study was approved by the Medical Ethics Committee of Wuhan University of Science and Technology (reference number: 202217)
Methods
Data were collected via retrospective review of the electronic record system. Dysphagia, dysphonia/aphonia, and vocal cord paralysis were identified by doctors from patients’ clinical manifestations and examinations, such as laryngoscopic evaluation. For patients without symptoms, dysphagia/aphasia was screened by the swallowing test first[10], and grades 3-5 were defined as dysphagia. Then patients were further diagnosed according to clinical examinations such as laryngoscopic evaluation. The classification criteria of swallowing test are as follows:
Grade 1: capable of drinking (swallow) all water in one going with no side effect.
Grade 2: capable of drinking all water by two swallows without causing coughing.
Grade 3: capable of swallowing in one go but accompanied by coughing.
Grade 4: need multiple swallows, and also have coughing.
Grade 5: need multiple swallows accompanied with frequent coughing.
Variable
A total of 23 variables were included in this study — (1) general variable: age, sex, body mass index (BMI), smoking and drinking history, admission, and insurance type; (2) perioperative variable: transesophageal echocardiogram (TEE), combined surgery type, diabetes, heart valve disease, re-entry to intensive care unit (ICU), number of coronary artery bypass grafts, ICU tracheal intubation time, tracheal tube size, tracheal intubation depth, endotracheal cuff pressure (CP), operative time, surgery method, cerebrovascular lesion, chronic lung disease, preoperative myocardial infarction, history of percutaneous coronary intervention, and length of stay in ICU.
Statistics Analysis
Data were analyzed using IBM Corp. Released 2019, IBM SPSS Statistics for Windows, version 26.0, Armonk, NY: IBM Corp., and we considered P<0.05 to be statistically significant. Patients’ baseline characteristics are described as frequencies and percentages. Comparisons among groups were performed using chi-square tests. We used multiple logistic regression to identify risk predictors and construct the prediction model. The discrimination of the risk prediction model was assessed by the area under the receiver operating characteristic curve, and Hosmer-Lemeshow (H-L) goodness of fit test was used to validate the calibration.
RESULTS
Basic Characteristics
A total of 1476 patients who underwent CABG were included for analysis, 68.43% of whom were male. Patients were aged from 38-83 years, with an average age of 63 years. The average number of grafts was 3 + 1.13 (mean + standard deviation). Baseline covariates are shown in Table 1.
Variable | No diagnosed LCs | LCs | P-value |
---|---|---|---|
(N=798) | (N=46) | ||
Age (years) | 0.073 | ||
< 60 | 257 (32.2) | 9 (19.6) | |
≥ 60 | 541 (67.8) | 37 (80.4) | |
Sex | 0.002 | ||
Male | 554 (69.4) | 22 (47.8) | |
Female | 244 (30.6) | 24 (52.2) | |
Body mass index (Kg/m2) | 0.008 | ||
< 18.5 | 24 (3.0) | 6 (13.0) | |
18.5-24.9 | 416 (52.1) | 20 (43.5) | |
≥ 24 | 358 (44.9) | 20 (43.5) | |
Admission type | 0.576 | ||
Outpatient | 523 (65.5) | 32 (69.6) | |
Emergency | 275 (34.5) | 14 (30.4) | |
Smoking history | 0.028 | ||
Yes | 393 (49.2) | 15 (32.6) | |
No | 405 (50.8) | 31 (67.4) | |
Alcohol history | 0.646 | ||
Yes | 161 (20.2) | 8 (17.4) | |
No | 637 (79.8) | 38 (82.6) | |
Insurance type | 0.378 | ||
Private insurance | 145 (18.2) | 6 (13.0) | |
Other | 653 (81.8) | 40 (87.0) | |
Use ofTEE | 0.001 | ||
Yes | 371 (46.5) | 33 (71.7) | |
No | 427 (53.5) | 13 (28.3) | |
Valve disease | < 0.001 | ||
Yes | 93 (11.7) | 15 (32.6) | |
No | 705 (88.3) | 31 (67.4) | |
Diabetes | 0.028 | ||
Yes | 243 (30.5) | 7 (15.2) | |
No | 555 (69.5) | 39 (84.8) | |
A history of PCI | 0.511 | ||
Yes | 80 (10.0) | 6 (13.0) | |
No | 718 (90.0) | 40 (87.0) | |
Surgery type | < 0.001 | ||
Isolated CABG | 573 (71.8) | 18 (39.1) | |
Non-isolated CABG | 225 (28.2) | 28 (60.9) | |
Re-entry to ICU | 0.016* | ||
Yes | 2 (0.3) | 2 (4.3) | |
No | 796 (99.7) | 44 (95.7) | |
Prior myocardial infarction | 0.138 | ||
Yes | 154 (19.3) | 13 (28.3) | |
No | 644 (80.7) | 33 (71.7) | |
Operation time (hours) | 0.001 | ||
< 5.03 | 452 (56.6) | 15 (32.6) | |
≥ 5.03 | 346 (43.4) | 31 (67.4) | |
ICU endotracheal intubation time (hours) | < .001 | ||
< 14.96 | 540 (67.7) | 18 (39.1) | |
≥ 14.96 | 258 (32.3) | 28 (60.9) | |
Surgery method | 0.392* | ||
Sternotomy | 773 (96.9) | 46 (100.0) | |
Minimally invasive | 25 (3.1) | 0 (0.0) | |
Cerebrovascular lesion | 0.758 | ||
Yes | 99 (12.4) | 5 (10.9) | |
No | 699 (87.6) | 41 (89.1) | |
Chronic lung diseases | 0.429* | ||
Yes | 69 (8.6) | 2 (4.3) | |
No | 729 (91.4) | 44 (95.7) | |
Endotracheal tube size (mm) | 0.019 | ||
< 8.0 | 546 (68.4) | 39 (84.8) | |
≥ 8.0 | 252 (31.6) | 7 (15.2) | |
Number of CABG (root) | 0.284 | ||
< 3 | 213 (26.6) | 9 (19.6) | |
≥ 3 | 584 (73.2) | 37 (80.4) | |
Endotracheal tube depth (cm) | 0.121 | ||
< 23 | 334 (41.9) | 14 (30.4) | |
≥ 23 | 461 (57.8) | 32 (69.6) | |
Endotracheal cuff pressure (cmH2O) | 0.437 | ||
< 26 | 153 (19.2) | 11 (23.9) | |
≥ 26 | 642 (80.5) | 35 (76.1) |
CABG=coronary artery bypass grafting; ICU=intensive care unit; LCs=laryngeal complications; PCI=percutaneous coronary intervention; TEE=transesophageal echocardiogram.
* Fisher’s exact test
Laryngeal Complications’ Outcomes
LCs were present in 95 (6.48%) patients after CABG, including dysphagia (3.32%, n=49), dysphonia (2.37%, n=35), and dysphagia and dysphonia (0.75%, n=11). Dysphagia is most common among laryngeal injuries in CABG patients. There were more than half of the LC patients over 65 years (59%).
Chi-square tests showed that there were significant differences with respect to sex, BMI, smoking, TEE, valve disease, diabetes, combined surgery type, re-entry to ICU, operation time, ICU tracheal intubation time, and tracheal tube size between LC and non-LC patients (P<0.05) (Table 1). Multivariate analysis revealed that sex, BMI, TEE, tracheal tube size, and ICU tracheal intubation time differed significantly between the LC and non-LC groups (Table 2).
Variable | B | Wald | P-value | OR | 95% CI | |
---|---|---|---|---|---|---|
Lower limit | Upper limit | |||||
Sex (female) | 0.824 | 5.56 | 0.018 | 2.279 | 1.149 | 4.519 |
BMI (Kg/m2) | 16.731 | < 0.001 | ||||
< 18.5 | 2.09 | 16.636 | < 0.001 | 8.083 | 2.961 | 22.065 |
≥ 24 | 0.374 | 1.187 | 0.276 | 1.453 | 0.742 | 2.848 |
Use ofTEE | 0.793 | 4.931 | 0.026 | 2.209 | 1.097 | 4.447 |
Tracheal tube size ≥ 8.0 (mm) | −0.568 | 1.472 | 0.225 | 0.566 | 0.226 | 1.419 |
ICU endotracheal intubation time ≥ 14.96 (hours) | 1.218 | 12.139 | < 0.001 | 3.380 | 1.704 | 6.706 |
Constant | −4.525 | 99.818 | < 0.001 | 0.011 |
Multivariate Model
Table 2 displays results of the multivariate regression model. The established LCs risk calculation formula was Logit (P) = −4.525 + 0.824 × female + 2.09 × BMI < 18.5 Kg/m2 + 0.793 × TEE + 1.218 × ICU intubation time.
Model Performance
We evaluated the performance of the derived model on 632 CABG cases. The C-statistic for the incidence of LCs in the derivation and validation cohorts was 0.769 (95% confidence interval [CI]: 0.698-0.840) and 0.811 (95% CI: 0.742-0.879), respectively (Figure 1). As showed in H-L test, the P-values in the modeling group and the verification group were 0.659 and 0.838, respectively (Figure 2).
DISCUSSION
In our study, the prevalence of LCs after CABG surgery was 6.48% (n=1476), including dysphagia (3.32%, n=49), dysphonia (2.37%, n=35), and dysphagia and dysphonia (0.75%, n=11), which was higher than the incidence reported in recent studies. Verma et al.[3] showed that the incidence of LCs was 1.7% based on the Nationwide Readmissions Database, which was consistent with the frequency of vocal fold paralysis reported following esophagectomy[5]. This study included approximately 2,319,628 patients with cardiac surgery and conducted International Classification of Diseases 9/10 diagnosis codes to identify LCs. In this study, LCs included vocal fold paralysis/paresis, dysphagia, dysphonia, aphagia, and aphonia, whereas in our study, just dysphagia, dysphonia, and dysphagia and dysphonia were included. Our study was conducted in an Asian hospital, and LCs were identified through patients’ symptoms, the screening test, and clinical examinations. These national sample studies may underestimate the incidence of LC due to a lack of standardized screening procedures[3, 5]. These discrepancies can be explained by methodological differences among studies[5].
Although a meta-analysis suggested that the rate of oropharyngeal dysphagia after receiving mechanical ventilation ranges from 3% to 62%[4], McIntyre et al.[4] pointed out that significant variation exists in the reported percentages between different dysphagia assessments. The incidence of post-extubation dysphagia was 42% from endoscopic assessment, 43% through clinical swallowing examination, 41% based on patient self-report, and 62% with the videofluoroscopy. We evaluated the dysphagia of every post-CABG procedure patient after leaving the ICU, according to the water swallowing level. Furthermore, they reached a conclusion that the rates of dysphagia did not have a significant association with different assessment methods, variable patient populations, participant recruitment methods, variable time of dysphagia assessments, or median duration of intubation[4]. However, variation in study design and different sensitivity and specificity of assessment ways may be the reason of the wide CI in patients who performed dysphagia after extubation[4].
The predictive model for LCs incorporated four risk factor variables: sex (female), BMI (low BMI and high BMI), use of TEE, and ICU intubation time, including preoperative and perioperative variables. This hints that both preoperative and perioperative management are great necessary to prevent the occurrence of LCs. Moreover, patients with longer intubation time were prone to have LCs. Previous study revealed a relationship between low BMI and malnutrition[8]. Feng et al.[7] have shown that dysphagia and poor nutritional status seem to have strong interrelationships in the prognosis and mortality. This is the same as the conclusion in a Korean Nationwide Study that dysphagia raises the risk of malnutrition, poor prognostic outcomes, and mortality[8].
Female sex is another predictor of the LCs. However, in our study, there were more males than females undergoing CABG surgery. It is consistent with the National database outcomes which reported that only 17.7% of all patients who underwent CABG were female[14]. Because the recognition of cardiovascular disease is later in women, it caused the delay of treatment for female patients[14]. Meanwhile, this study also claimed that females following cardiac surgery were older and had more comorbidities than males, which may account for their poorer outcomes.
The use of TEE is very common in cardiac surgery[15]. It is also identified as a predictor of LCs. The optimal CP suggested is between 20 and 30 cmH2O, but the current study demonstrated that the CP were elevated after TEE probe insertion[16]. Therefore, in patients with hemodynamic instability undergoing on-pump cardiac surgery, tracheal hypoperfusion is more likely to occur[16]. Moreover, laryngoscope-assisted probe placement can reduce trauma to the laryngeal soft tissue[15]. In addition, ICU intubation time was examined as a predictive factor for LCs, which was constant with the previous study in patients receiving prolonged endotracheal intubation after cardiac surgery. The occurrence of cerebrovascular stroke, sepsis, and prolonged endotracheal intubation were identified to be the independent predictors of dysphagia[17]. Furthermore, it has been reported that both dysphagia and longer endotracheal intubation were independent risk factors for delaying recovery to a normal oral diet, thus, delaying discharge and leading to poor nutrition consequences.
This predictive model indicates that strengthening preoperative and perioperative management and modifying controllable factors of CABG patients may prevent CABG patients from laryngeal injury. Patients with low BMI may have poor nutrition conditions[8]. The current study suggests the intervention of combining nutritional management and high-energy intake to avoid post-extubation complications in patients after cardiovascular surgery[18].
Furthermore, nurses, dental hygienists, and speech-language pathologists could improve dysphagia outcomes by implementing multidisciplinary oral care interventions[18]. Feng et al.[7] also pointed that stroke patients after conducting the intensive exercise-based swallow rehabilitation program may have less malnutrition and aspiration pneumonia when compared to patients without intervention.
Limitations
The strength of this study is that it is the first to study risk factors and develop a prediction model in patients who underwent CABG. However, limitations of this study need to be acknowledged. First, because our study is a single-center retrospective study, the populations of LCs are slightly limited, and we cannot identify the severity of dysphagia. What’s more, according to the present studies, because there is lack of unified criteria to identified LCs, further research is required to develop a comprehensive best treatment, which would be an advancement in understanding for the multidisciplinary team, enabling effective collaboration to prevent the occurrence of LC and optimize quality of life for Chinese CABG patients. Therefore, the model needs further multi-center validation. Videofluoroscopy and fiberoptic endoscopy are suggested as the gold standard methods, but these are invasive and require specialized staff and facilities, and the reliability is poor in the absence of assessor training[13]. Given that patients after CABG are weak and need to stay in bed for a long time, it is difficult to complete the “gold standard” screening, and the required facilities may not be available in all units at the bedside[9, 19]. Therefore, dysphagia needs a standard screening and should be included in patient education and surgical consent[20]. Surgical strategies are also associated with the increasing risk of dysphagia[20]. The multifactorial nature in this high risk, complex population may explain the lack of optimal assessment and management approaches to direct clinicians. Additionally, future prospective studies could explore personalized strategies to reduce the rate of LCs. Although this study has such limitations, the prediction model can be used in Chinese patients undergoing CABG, in order to implement the assessment of diet strategy.
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Authors’Roles & Responsibilities
JP = Substantial contributions to the conception and design of the work; and the analysis of data for the work; drafting the work; final approval of the version to be published
YZ = Substantial contributions to the conception and design of the work; and the analysis of data for the work; drafting the work; final approval of the version to be published
XL = Substantial contributions to the acquisition and analysis of data for the work; final approval of the version to be published
XF = Substantial contributions to the acquisition and analysis of data for the work; final approval of the version to be published
ZY = Substantial contributions to the acquisition and analysis of data for the work; final approval of the version to be published
YH = Substantial contributions to the acquisition and analysis of data for the work; final approval of the version to be published
WZ = Substantial contributions to the design of the work; and the acquisition of data for the work; final approval of the version to be published
JZ = Substantial contributions to the analysis of data for the work; final approval of the version to be published
JL = Substantial contributions to the analysis of data for the work; final approval of the version to be published
Article receive on Saturday, November 4, 2023
Article accepted on Sunday, December 10, 2023