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Int J Med Sci 2021; 18(6):1432-1441. doi:10.7150/ijms.55567 This issue Cite

Research Paper

Predictors of Red Blood Cell Transfusion in Bimaxillary Orthognathic Surgery: A Retrospective Study

Seung-Hyun Rhee^1*, Jung-Sub An^2*, Kwang-Suk Seo³ , Myong-Hwan Karm¹

1. Department of Dental Anesthesiology, Seoul National University Dental Hospital, Seoul, Republic of Korea.
2. Department of Orthodontics, Seoul National University Dental Hospital, Seoul, Republic of Korea.
3. Department of Dental Anesthesiology and Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Republic of Korea.
*Co-first authors with equal contributions to this work.

✉ Corresponding authors: Myong-Hwan Karm & Kwang-Suk Seo contributed equally to this work. Myong-Hwan Karm, Department of Dental Anesthesiology, Seoul National University Dental Hospital, 101, Daehak-ro, Jongno-gu, Seoul, Republic of Korea. Tel.: +82-2-2072-3847; Fax: +82-51-242-8428; E-mail: karmmhac.kr. Kwang-Suk Seo, Department of Dental Anesthesiology and Dental Research Institute, School of Dentistry, Seoul National University, 101, Daehak-ro, Jongno-gu, Seoul, Republic of Korea. Tel.: +82-2-2072-0622; Fax: +82-51-242-8428; E-mail: stone90ac.kr. More

Abstract

Background: Orthognathic surgery requires red blood cell (RBC) transfusions more frequently than other oral and maxillofacial surgeries. The purpose of this study was to identify reliable predictors for RBC transfusion during bimaxillary orthognathic surgery (BOS).

Methods: This retrospective study reviewed 1,616 electronic medical records of patients who underwent BOS during a 5-year period at Seoul National University Dental Hospital. The perioperative variable data were collected from electronic medical records and analyzed by dividing patients into the two groups (non-transfusion and transfusion group).

Results: Of the 1,616 patients, 1,311 patients were excluded. The remaining 305 patients were divided into non-transfusion (NTF, n = 256) and transfusion (TF, n = 49) groups. Univariate logistic regression analysis revealed that age, body mass index, the presence of several adjunctive surgeries (including genioplasty, extraction, and mandibular angle reduction), preoperative hemoglobin (Hb) and prothrombin time, surgical time, amount of fluid infusion and blood loss, and mean pulse rate during surgery were significant factors predicting RBC transfusion. Multivariate logistic regression analysis revealed that preoperative Hb and blood loss amount during surgery were significantly related to RBC transfusion in BOS patients.

Conclusion: Since blood loss amounts could not be measured preoperatively, we found that the independent predictor associated with RBC transfusion during BOS was a low preoperative Hb level.

Keywords: blood transfusion, hemoglobins, orthognathic surgery, red blood cell

Introduction

Red blood cell (RBC) transfusions are rare in oral and maxillofacial surgery, but in some cases of orthognathic surgery, it is required [1]. The number of orthognathic surgeries that are performed each year is increasing due to their effectiveness in improving dentofacial anomalies. The possibility of blood loss during orthognathic surgery is high due to the poor visualization and high vascularity [2]. Thus, orthognathic surgery has a higher frequency of RBC transfusion than other oral and maxillofacial surgeries [1, 3, 4]. Several studies have shown that blood loss is greater during bimaxillary orthognathic surgery (BOS) compared to that of single-jaw orthognathic surgery [1, 5].

If there is a lot of bleeding during surgery, intraoperative RBC transfusion is inevitable, but it can cause several complications [6]. RBC transfusions are associated with mortality and a significant increase in the length of postoperative hospital stay [4, 5]. Several studies have introduced methods to reduce blood loss, including induced hypotensive anesthesia [7, 8], injections of tranexamic acid and desmopressin [9-11], and preoperative autologous blood donation (PABD) [12, 13] during orthognathic surgery. If the amount of blood loss can be predicted before BOS is performed, the surgical team can prepare for it and possibly prevent it. However, it is difficult to predict the amount of blood loss before BOS, as well as the potential for RBC transfusion. The operating time, segmentation of the maxilla, and preoperative values of the RBC count, hemoglobin (Hb), and hematocrit (Hct) can influence the amount of blood loss during orthognathic surgery [2, 14, 15]. However, previous studies were conducted by various operators, and the reliability of the factors affecting blood loss conflicted between studies. In addition, few articles have been published on RBC transfusion-related factors in BOS.

To our knowledge, no article has demonstrated the reliable predictors of RBC transfusion during BOS. The purpose of the present study was to determine reliable predictors of RBC transfusion during BOS.

Methods

This retrospective study was conducted at the Department of Dental Anesthesia at the Seoul National University Dental Hospital, Seoul, Republic of Korea. The need to obtain informed consent was waived since the data for the study were obtained solely from electronic medical records (EMRs) were reviewed. This single-center retrospective study was approved by the Institutional Review Board of the Seoul National University School of Dentistry (Approval number, S-D20190029). Under the approval of the Institutional Review Board, we collected EMR data from July 2014 to December 2019.

Patients

The EMRs of 1,616 patients who underwent elective orthognathic surgery at our institute from July 2014 to December 2019 were reviewed for this study. The patients were diagnosed with mandibular prognathism, mandibular retrognathism, facial asymmetry, malocclusion, and obstructive sleep apnea. The inclusion criteria for this study included patients who underwent elective orthognathic surgery at our institute. Exclusion criteria were as follows: (1) patients who were not treated by a single surgical surgeon and single anesthesiologist; (2) patients who underwent re-fixation; (3) patients with the American Society of Anesthesiologists (ASA) patient status III or higher; (4) patients who underwent single jaw surgery; (5) patients who did not follow the pathway of normal orthognathic surgery, (e.g., total temporomandibular joint reconstruction, distraction osteogenesis, hemifacial microsomia); (6) patients who underwent PABD; (7) patients with coagulation disorders; and (8) patients with insufficient data in their EMRs.

Anesthetic technique

All surgeries at our institute were performed by the oral and maxillofacial surgeon with more than 10 years of BOS experience and the anesthesiologist using the same protocol for each case. Standard preoperative evaluations, such as medical history, vital signs, routine laboratory tests, electrocardiography (ECG), and chest X-rays were performed for all patients within three months of surgery. No patients were given any preanesthetic medications before arriving in the operating room. Anesthesia was induced after establishing routine patient monitoring (pulse oximetry, ECG, and non-invasive blood pressure), bispectral (BIS) index monitoring, and sufficient preoxygenation. Two methods of anesthesia were performed: volatile and total intravenous anesthesia. For volatile anesthesia, anesthesia was induced with 1% propofol (1.5-2.5 mg/kg) or thiopental (4-5 mg/kg). When 1% propofol was used, 30 mg lidocaine was used prior to the propofol injection. For total intravenous anesthesia, the first target effect site concentration of propofol was set to 5 μg/mL with 5 ng/mL of remifentanil, which were administered with an Orchestra Base Primea target-controlled infusion system (Fresenius Kabi, Bad Homburg, Germany). For the neuromuscular blockades, a 0.5-0.8 mg/kg bolus of rocuronium was administered following anesthesia induction, and additional doses were administered as needed. After sufficient time for muscle relaxation, nasotracheal intubation was performed and mechanical ventilation was maintained in a volume control mode with 50% oxygen and 6-8 mL/kg of tidal volume with positive end expiratory pressure utilized as needed. The respiratory rate was adjusted to maintain end-tidal carbon dioxide partial pressure between 30 and 35 mmHg. Invasive blood pressure monitoring and arterial blood gas analysis (ABGA) were performed by placing a 20-gauge catheter in the dorsalis pedis artery. For volatile anesthesia, desflurane or sevoflurane was administered, and the minimum alveolar concentration was maintained between 0.9 and 1.2 depending on the BIS index level (40-60) and vital signs. For total intravenous anesthesia, propofol (2-4 μg/mL) and remifentanil (3-10 ng/mL) were used depending on the BIS index level (40-60) and vital signs. Several methods were used to reduce blood loss and the possibility of an RBC transfusion. Induced hypotensive anesthesia (mean arterial pressure 50-65 mmHg) was administered for procedures in which considerable blood loss was expected like down fractures of the maxilla, mandibular osteotomies, genioplasties, or mucosal incisions [16, 17]. To check the patient's status, ABGA was performed every two hours during surgery. Urine output was measured every hour after bladder catheterization. Upon completion of the operation, residual neuromuscular paralysis was reversed using sugammadex. After recovery of self-respiration, the patients were transferred to a postanesthetic care unit. After confirmation of the complete recovery of consciousness, self-respiration (with sustained spontaneous respiration rate > 12/min), and an open airway, the tracheal tube was removed.

Surgical technique: bimaxillary orthognathic surgery; Le Fort I osteotomy and bilateral sagittal split osteotomy

Before surgical incision, all patients were infiltrated with four to five dental lidocaine cartridges (2% lidocaine with 1:100,000 epinephrine) in the mucosa of the incision site. The procedure was initiated with a Le Fort I (LFI) osteotomy. After mobilization of the maxilla, the greater palatine canal and the descending palatine neurovascular bundle were identified. A large amount of bleeding was expected during the posterior procedure of the maxilla because of its rich pterygomaxillary vascular network [18]. A judicious fracture of the pterygoid plates was performed to complete the osteotomy. The maxilla was subsequently moved to the planned position and any bony interferences were removed during this process. Mandibular surgery was performed using the bilateral sagittal split osteotomy (BSSO) technique [19]. The technique used in our study involved splitting the mandible at the inferior border, which provides controlled positioning of the proximal segment.

Transfusion criteria and grouping

The perioperative RBC transfusion approach was in accordance with recent standard transfusion guidelines [20-22]. Indications for RBC transfusion included an Hb value below 7-8 g/dL and/or when an anesthesiologist determined that RBC transfusion was necessary. A delay in RBC transfusion until the end of the main procedure was attempted while maintaining the blood pressure with an infusion of crystalloids or colloids. All the data from the two patient groups were divided to assess the predictors of RBC transfusion: TF group (patients who were transfused with RBC) and NTF group (patients who were not transfused with RBC). In addition, the TF group was divided into two subgroups: a smaller volume transfusion group (same or less than two RBC packs) and a larger volume transfusion group (more than two RBC packs).

Data collection

Data on potential factors correlated to intraoperative blood loss were retrospectively collected from the EMRs of patients who received elective BOS. Demographic data (age, gender, body weight, height, body mass index [BMI], preoperative vital signs, past medical and surgical history, and ASA classification) were collected. Laboratory data (including Hb, Hct, platelet count, activated partial thromboplastin time, international normalized ratio [INR], prothrombin time [PT], calcium, phosphorus, glucose, blood urea nitrogen, uric acid, cholesterol, total protein, albumin, total bilirubin, alkaline phosphatase, aspartate aminotransferase, alanine aminotransferase, creatinine, sodium, potassium, and chloride), chest X-rays, and 12-lead ECGs were collected. Intraoperative data (durations of surgery and anesthesia, amounts of drugs and fluid, estimated intraoperative blood loss [EBL], urine output, number of packed RBC transfusions, and ABGA data every two hours) were collected. Throughout the surgery, the mean value of oxygen saturation, pulse rate, end-tidal carbon dioxide, body temperature, systolic, diastolic, and mean arterial blood pressure were collected every 5 minutes. In addition, the mean value of pulmonary compliance, peak inspiratory pressure, and BIS were collected every 15 minutes. The EBL was calculated by subtracting the volume of saline solution used for irrigation from the total volume accumulated in the suction unit [23, 24]. The blood in the gauze was not included in the EBL measurement.

Statistical analysis

Baseline characteristics and pre- and intraoperative variables of patients who underwent BOS were compared to assess the differences between the TF and NTF groups. Continuous data were analyzed using the independent t-test and categorical data were compared with a chi-square test or Fisher's exact test.

The variables associated with RBC transfusions were included in the univariate logistic regression analysis. The multivariate logistic regression analysis was performed on selected variables (age, BMI, preoperative Hb, preoperative PT, and EBL) to evaluate the independent factors associated with RBC transfusions. The variables were selected based on biological plausibility, clinical significance, and statistical considerations. The goodness of the fit of the model was evaluated using the Hosmer-Lemeshow test.

Differences in the baseline and the pre- and intraoperative variables between the smaller (less than two RBC packs) and larger (more than two RBC packs) volume transfusion groups were analyzed using the Mann-Whitney U test. For all statistical analysis, IBS SPSS Statistics 25 was used and P < 0.05 was considered to be statistically significant.

Results

For eligibility, 1,616 patients who were scheduled to undergo orthognathic surgery between July 2014 and December 2019 at our institute were screened. Of these, 1,311 were excluded for the following reasons: 1,259 patients did not underwent a procedure completed by a single surgeon; 2 patients required re-fixation; 11 patients underwent single jaw surgery; 6 patients followed a unusual orthognathic surgery pathway like distraction osteogenesis (2 patients), total temporomandibular joint reconstruction (2 patients), iliac bone graft to hemifacial microsomia patients (2 patients); and 33 patients had insufficient data in their EMRs. Thus, 305 patients were selected for the study and were subsequently divided into the NTF (256 patients) and TF (49 patients) groups (Figure 1).

 Figure 1 

A flow diagram of the study population. BOS: bimaxillary orthognathic surgery; EMR: electronic medical records.

Statistically significant differences were found between the NTF group and TF group with regard to the baseline demographic data. Patients in the TF group were younger (P = 0.042) with smaller weight and height values (P < 0.001) and, thus lower BMI (P = 0.007) than the noes in the NTF group. There was no difference between the two groups in gender ratio, past medical and surgical history, and ASA classification (Table 1).

Some preoperative conditions differed between the two groups. In the TF group, body temperature was significantly higher (P = 0.011) while Hb and Hct were significantly lower (P < 0.001). Patients who received RBC transfusions (TF group) also exhibited higher INR and PT (P = 0.004). Other preoperative conditions were not significantly different between the two groups (Table 2).

In this study, three types of osteotomies were performed for the maxilla (LFI osteotomy, LFI osteotomy with anterior segmentation, and LFI osteotomy with Y segmentation) and two types of osteotomies performed for the mandible (BSSO, and BSSO with anterior segmentation). Additional procedures including genioplasties, segmental osteotomies of the maxilla, turbinectomies, tooth extractions, mandibular angle reduction, glossectomies, iliac bone grafts, and face lifts with threads were performed if necessary. The effects of the procedures on EBL and RBC transfusions were also investigated. Patients in the TF group received significantly more adjunctive surgical procedures than the NTF group including genioplasties (P = 0.007), tooth extractions (P = 0.006), and mandibular angle reduction (P = 0.001). The type of anesthesia used was not correlated with a statistically significant difference between the two groups (Table 3).

The TF group underwent longer surgery and anesthesia times than the NTF group and had more EBL, which resulted in higher amounts of crystalloid and colloid infusions (P < 0.001). In addition, the TF group exhibited a lower BIS index (BIS) (P = 0.023), higher mean oxygen saturation (P = 0.005), and faster mean pulse rate (P = 0.001) during surgery (Table 4).

ABGA was performed up to 5 times administered in 2-hour intervals. All patients (n = 305) underwent at least one ABGA. The 2^nd, 3^rd, 4^th, and 5^th examinations were performed on 302, 269, 122, and 38 patients, respectively. Hb and Hct were significantly different between the two groups for all five ABGA results (P < 0.05). Partial pressure of oxygen was significantly different four times (1^st, 2^nd, 3^rd, and 4^th) (P < 0.05); peripheral oxygen saturation was different four times (1^st, 2^nd, 3^rd and 5^th) (P < 0.05); and the calcium level was different three times (2^nd, 4^th, 5^th) during each examination (P < 0.05) (Table 5).

Univariate logistic regression analysis revealed that age, BMI, presence of several adjunctive surgeries (including genioplasty, extraction, and mandibular angle reduction), preoperative Hb and PT, surgical time, amount of fluid infusion, EBL, and mean pulse rate during surgery were significant factors predicting RBC transfusions (P < 0.05; Table 6). In the multivariate logistic regression analysis, the independent variables that were significantly related to RBC transfusions in BOS were preoperative Hb (odd ratio [OR] = 0.413; P < 0.001) and EBL (OR = 1.005; P < 0.001) (Table 6). The difference in the preoperative Hb levels between the TF and NTF groups is shown in Figure 2.

Of the 49 patients who received RBC transfusions, five patients received one pack of RBCs; 34 patients received two packs; five patients received three packs; three patients received four packs; one patient received five packs; and one patient received seven packs. There was no significant difference in the variables between the smaller volume transfusion group (same or less than two RBC packs, n = 39) and the larger volume transfusion group (more than two RBC packs, n = 10) except for mean body temperature during surgery. The intraoperative mean body temperature of the larger volume transfusion group (35.3 °C) was significantly lower than that of the smaller volume transfusion group (36.0 °C) (P = 0.003) (Supplementary Table 1).

 Figure 2 

Comparison of preoperative hemoglobin levels between the RBC transfusion group and no RBC transfusion group. RBC: red blood cells.

Discussion

In the present study, we evaluated predictors of RBC transfusions in 305 patients who underwent BOS. According to the results of this study, patients of the TF group were younger and smaller (height, body weight, and BMI); exhibited lower preoperative Hb and Hct; and had higher preoperative INR, PT, and body temperature. The TF group had a longer surgery time than the NTF group, and accordingly was anesthetized for a longer period. As a result, the amount of fluid infusion was higher due to an increase in EBL. This was probably due to the fact that the TF group underwent adjunctive surgeries. In the TF group, the mean value of intraoperative oxygen saturation and pulse rate were higher and the BIS was lower than NTF group. The only significant difference among the intraoperative ABGA was Hb through 5 times of examinations. In the univariate logistic regression, preoperative Hb and PT, total fluid, EBL, and the mean value of the pulse rate exhibited significant differences among the groups. Among them, preoperative Hb and EBL were considered to be important factors affecting RBC transfusions in multivariate analysis. Since EBL is dependent on factors that are affected by surgery, preoperative Hb was the only factor that can predict RBC transfusion before BOS.

The TF group exhibited higher preoperative body temperature than the NTF group. However, in the TF group, the larger volume transfusion group (more than two RBC packs, n = 10) had lower perioperative body temperature compared to the smaller volume transfusion group (same or less than two RBC packs, n = 39). This result is probably due to the low temperature of the cold pack used for RBC transfusions. However, since both groups showed perioperative body temperatures within the normal range, this result is not considered to have significant clinical importance.

Surgical bleeding or PABD may affect RBC transfusion during BOS. Depending on the surgeon, the amount of bleeding may differ even during similar types of surgery. Therefore, to exclude differences between surgeons, 305 patients who underwent a procedure that was performed by the single surgeon were included in this study. PABD may affect the preoperative condition of the patient, so patients who performed PABD were also excluded.

In orthognathic surgery, RBC transfusions are relatively infrequent with a reported incidence rate of 2-19.5% [5, 23, 25]. In the present study, 49 (16.3%) patients received RBC transfusions. The reason why our study exhibited a relatively higher incidence of RBC transfusions compared to other studies is that the need for transfusion is more conservatively determined than the current guidelines. Our indications for RBC transfusions included intraoperative Hb values lower than 7-8 g/dL and/or when an anesthesiologist determines that RBC transfusion is necessary. Factors that the anesthesiologist in this study considered when deciding to initiate a RBC transfusion include sudden and rapid bleeding, such as arterial bleeding, large blood loss relative to body weight, and unfavorable vital signs.

It has been reported in previous studies that EBL, operative time [15, 23], adjunctive surgical procedures [26, 27], gender, and experience of the surgeon [28] are factors that influence RBC transfusion during orthognathic surgeries. In the present study, the operating time and EBL also exhibited significant differences between the TF and NTF groups. However, these factors are difficult to accurately predict before surgery, and therefore, it is inappropriate to select them as factors predicting whether a RBC transfusion will be performed before surgery. There are also several reports of adjunctive surgical procedure, and the experience of the surgeon is not predictor for RBC transfusion [2, 28]. In the present study, the frequency of additional surgical procedures (genioplasty, tooth extraction, and mandibular angle reduction) were also different between the two groups, with a significant difference in univariate analysis. Multivariate analysis revealed that EBL and preoperative Hb were the factors that predicting whether RBC transfusion was performed during BOS, but preoperative Hb was the only factor that could be accurately evaluated before surgery. This study found that the preoperative Hb level was significantly lower in the group who underwent RBC transfusion. There have been reports that preoperative Hb level is a predictor of transfusion in other kinds of surgery [29, 30], but as far as we know, there have been no reports showing that it can be an independent predictor even in BOS.

It has been reported that blood loss during BOS can be reduced by using induced hypotension anesthesia [17, 31, 32]. In the present study, we maintained the mean arterial pressure between 50 and 65 mmHg only during the main surgical procedure with an overall operation average of approximately 67.7 mmHg. There have been reports that blood pressure was associated with blood loss [1, 33], but in this study, mean arterial pressure did not show a significant difference between the two groups.

Other methods, besides induced hypotension anesthesia, also minimize EBL during orthognathic surgery. Several studies have shown that the intravenous administration or oral irrigation of tranexamic acid are effective in reducing EBL [24, 34, 35]. Desmopressin also affects perioperative bleeding by altering the activity of the von Willebrand factor, which is used in many surgical procedures with bleeding tendencies [36]. Lee et al. showed that acute normovolemic hemodilution can reduce EBL and homologous transfusion when used with PABD and induced hypotensive anesthesia [37]. The head-up tilt positioning is a traditional and effective way to reduce excessive EBL by stabilizing the amount of blood flowing to the head and neck regions [38]. Hydroxide carboxymaltose complexes are gaining popularity as a way to increase the Hb value [39]. In the present study, we demonstrated that low preoperative Hb levels increases the risk of RBC transfusions. Therefore, several methods to reduce EBL, such as induced hypotension anesthesia, the administration of tranexamic acid, desmopressin and hydroxide carboxymaltose complex, acute normovolemic hemodilution, and head-up tilt positioning can help reduce the chance of RBC transfusions.

The present study had the following limitations. First, this study was a retrospective study with a relatively small sample size. By comparison, the number of patients belonging to the TF group was relatively smaller than those of a NTF group. The retrospective study is difficult to be blinded, well-designed, or well-controlled. However, this study only included cases in which one anesthesiologist performed anesthesia and one surgeon performed surgery to reduce the bias, and excluded patients who underwent PABD. If a multicenter study is conducted with a large number of patients in a situation where the bias is controlled, the reliability can be increased further. Second, we cannot rule out the possibility that other factors that are not included in our dada have influenced RBC transfusion. We tried to collect as much data as possible through EMR. However, data collection was limited because of the retrospective nature of this study. Third, the criteria for RBC transfusion were not uniform in our study subjects. As described in the method section, RBC transfusion was performed when the Hb value was 7-8 g/dL or less, and/or when the anesthesiologist determined that RBC transfusion was necessary. Lastly, another specific limitation is EBL. EBL was calculated by subtracting the volume of saline solution used for irrigation from the total volume accumulated in the suction unit because the amount of small bone pieces, saliva, and soaked gauze could not be precisely calculated. However, since similar types of surgery were performed by a single surgeon, the blood loss excluded from the calculation is expected to be similar in all patients.

Conclusion

RBC transfusion is an essential procedure to save a patient's life and increase long-term success rate of the surgery, but it is expensive and can result in several complications. The chance of RBC transfusions during surgery should be reduced, if possible, by taking steps to reduce the bleeding. This study shows that preoperative Hb is an important predictor for RBC transfusion in BOS. Therefore, if a patient who will undergo BOS has a low preoperative Hb, surgical and anesthetic considerations are required to reduce EBL during surgery.

Abbreviations

ABGA: arterial blood gas analysis; ASA: American Society of Anesthesiologists; BIS: bispectral; BMI: body mass index; BOS: bimaxillary orthognathic surgery; BSSO: bilateral sagittal split osteotomy; EBL: estimated intraoperative blood loss; ECG: electrocardiography; EMR: electronic medical record; Hb: hemoglobin; Hct: hematocrit; INR: international normalized ratio; LFI: Le Fort I; NTF: patients who were not transfused with red blood cells; PABD: preoperative autologous blood donation; PT: prothrombin time; RBC: red blood cell; TF: patients who were transfused with red blood cells.

Supplementary Material

Supplementary table S1.

Acknowledgements

The authors would like to thank Dental Research Institute of Seoul National University for the English language review.

Ethics Committee Approval and Patient Consent

Dental Research Institute of Seoul National University Institutional Review Board approval number: S-D20190029.

Author contributions

Conceptualization: Myong-Hwan Karm; Methodology: Myong-Hwan Karm; Software: Seung-Hyun Rhee; Validation: Myong-Hwan Karm; Formal analysis: Jung-Sub An; Investigation: Seung-Hyun Rhee; Resources: Myong-Hwan Karm; Data curation: Seung-Hyun Rhee; Writing—original draft preparation: Seung-Hyun Rhee and Jung-Sub An; Writing—reviewing and editing: Myong-Hwan Karm; Visualization: Jung-Sub An; Supervision: Kwang-Suk Seo; Project administration: Myong-Hwan Karm.

Competing Interests

The authors have no funding and conflicts of interest to disclose.

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Author contact

Corresponding authors: Myong-Hwan Karm & Kwang-Suk Seo contributed equally to this work. Myong-Hwan Karm, Department of Dental Anesthesiology, Seoul National University Dental Hospital, 101, Daehak-ro, Jongno-gu, Seoul, Republic of Korea. Tel.: +82-2-2072-3847; Fax: +82-51-242-8428; E-mail: karmmhac.kr. Kwang-Suk Seo, Department of Dental Anesthesiology and Dental Research Institute, School of Dentistry, Seoul National University, 101, Daehak-ro, Jongno-gu, Seoul, Republic of Korea. Tel.: +82-2-2072-0622; Fax: +82-51-242-8428; E-mail: stone90ac.kr.

Received 2020-11-6
Accepted 2021-1-7
Published 2021-1-29

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