Predictive factors associated with the persistence of chest pain in post-laparoscopic myotomy and fundoplication in patients with achalasia

Background: Episodic angina-like retrosternal pain is a prevalent symptom for achalasia patients pre- and post-treatment. The cause of postoperative chest pain remains poorly understood. Moreover, there are no reports on their predictive value for chest pain in the long-term post-treatment. The effect of laparoscopic Heller myotomy (LHM) and fundoplication techniques (Dor vs. Toupet) is unclear.

Methods: We analyzed a cohort of 129 achalasia cases treated with LHM and randomly assigned fundoplication technique. All the patients were diagnosed with achalasia by high-resolution manometry (HRM). Patients were followed up at 1-, 6-, 12-, and 24-month post-treatment. We implemented unadjusted and adjusted logistic regression analyses to evaluate the predictive significance of pre- and post-operative clinical factors.

Results: Preoperative chest pain with every meal was associated with an increased risk of occasional postoperative chest pain [unadjusted model: odds ratio (OR) = 12, 95% CI: 2.2–63.9, P = 0.006; adjusted model: OR = 26, 95% CI: 2.6–259.1, P = 0.005]. In type II achalasia, hypercontraction was also associated with an increased risk of chest pain (unadjusted model: OR = 2.6 e⁹ in all the patients). No significant differences were associated with age, type of achalasia, dysphagia, esophageal shape, and integrated relaxation pressure (IRP) with an increased risk of occasional postoperative chest pain. Also, there was no significant difference between fundoplication techniques or surgical approaches (e.g., length of myotomy).

Conclusion: Preoperative chest pain with every meal was associated with a higher risk of occasionally postoperative chest pain.

Introduction

Achalasia is a rare primary esophageal motor disorder characterized by the absence of swallow-induced relaxation of the lower esophageal sphincter and aperistalsis along the esophageal body (1–5). Although the etiology remains unclear, an interaction between autoimmune and inflammatory responses in genetically susceptible individuals leads to the loss of inhibitory neurons (and their mediators) in the myenteric esophageal plexus (4–10). This neuronal injury produces food transit impairment, which clinically manifests as dysphagia, regurgitation of saliva or undigested food, weight loss (1–4, 11), and episodic angina-like retrosternal pain (12–20). Of these symptoms, chest pain markedly lowers the quality of life and might overshadow typical symptoms leading to delayed diagnosis (16, 18). In addition, it is the most often underrecognized symptom by surgeons in the postoperative period (20).

Chest pain occurs in approximately 36–66% of pre- and 11–77.3% of post-achalasia treatment in different cohorts (12–20). Most pharmacological treatments are ineffective against this symptom, partly because the onset mechanism is poorly understood (16). Several pathways conducive to chest pain have been proposed. However, no single cause has been directly linked to this symptom. Currently, high-amplitude repetitive contractions stimulating esophageal mechanoreceptors (12, 13, 15, 16), the direct chemical stimulation of receptors on the esophageal mucosa (16, 21), the improved esophageal emptying post-myotomy (17, 22, 23), and its association with time since diagnosis (12) or gastroesophageal reflux disease are plausible factors under research (18, 24). Moreover, its remission in the post-treatment period by laparoscopic Heller myotomy (LHM), pneumatic dilation (PD), or Botox administration is still under evaluation (12–20).

Prior reports have indirectly assessed some of these mechanisms in prospective studies (12–20). However, the significance of clinical factors (e.g., age, time since diagnosis, HRM, and pHmetry findings) as surrogates of these pathophysiology pathways are contradictory and merit replication. Furthermore, no study has systematically assessed the probability of multiple occurrences of this symptom during the follow-up. Instead, all the studies have focused on describing clinical characteristics associated with patients affected by chest pain or evaluated a short-period post-treatment (12–20). To date, the relationship between patient characteristics [age, sex, body mass index (BMI), and time with achalasia]; barium swallow (grade of esophageal dilation, and shape), and high-resolution manometry (HRM) findings (achalasia type, pressures, and contraction vigor), the effect of treatment (type of fundoplication, and longitude of myotomy) and the change in HRM, pHmetry, and clinical scoring [Eckardt, DeMeester, Eating Assessment Tool-10 (EAT-10), Gastroesophageal Reflux Disease-Health Related Quality of Life (GERD-HQRL)] during follow-up on chest pain incidence are conflicting (12–20).

Since 2012, we have followed 129 achalasia patients who underwent LHM and randomly allocated fundoplication (Dor vs. Toupet). In this cohort, we monitored changes in clinical characteristics (incidence of symptoms) and diagnostic study findings (HRM) for over 8 years. Here, with these long-term assessments, we aimed to estimate the cumulative incidence of chest pain, accounting for multiple episodes during follow-up, at 48 months post-LHM. Moreover, assess the effect of preclinical and postoperative characteristics (type of fundoplication, longitude of myotomy, symptom questionnaires, barium swallow, and HRM findings) on long-term chest pain.

Materials and methods

Study design

A cohort study was followed by a randomized controlled trial to compare Dor vs. Toupet fundoplication after LHM. We analyzed 129 achalasia cases. A full description of this cohort is available elsewhere (25). All the cases were evaluated and followed-up at Instituto Nacional de Ciencias Médicas y Nutrición, Salvador Zubirán in Mexico City from 2012 to 2018 under an Institutional Review Board (IRB) approved protocol (IRB#: 1522). This study attained the Declaration of Helsinki principles, and written informed consent was obtained from all the subjects.

Population

All the recruited cases had a confirmed diagnosis of achalasia by barium esophagogram, upper endoscopy, and HRM. We analyzed adult patients (≥ 18 years or older) without prior history of Chagas disease, esophageal stricture, gastric or esophageal cancer, peptic stricture, other esophageal motility disorders, or previous surgical treatment. At baseline, we performed detailed interviews and clinical assessments to collect demographic data and clinical history of achalasia. Achalasia symptoms were tracked at baseline and follow-up with the following international standardized, validated questionnaires: (1) Eckardt for dysphagia, regurgitation, chest pain, and weight loss (26); (2) GERD-HRQL to evaluate GERD symptoms (27); and finally (3) EAT-10 for dysphagia (28). For chest pain and dysphagia frequency pre- and postoperatively, we implemented the following scale: (1) any symptom, (2) occasional or intermittent, (3) daily, or (4) experiencing symptom with every meal.

Interventions and follow-up

Before surgery, all the patients underwent an upper endoscopy, barium swallow, and HRM before and after surgery, and an upper gastrointestinal series and upper endoscopy were performed on all the patients. Postoperative assessments included upper endoscopy, pHmetry, HRM, and clinical evaluation of symptoms (chest pain and dysphagia frequency, Eckardt, GERD-HRQL, and EAT-10) conducted at 1-, 6-, 12-, 24-, and 48-month postoperatively.

High-resolution manometry and 24-h pH monitoring

High-resolution manometry assessments were performed with a 360 high-resolution catheter with 36 channels (Medtronic ManoScan™, Minneapolis, MN, USA). We considered vigorous achalasia with any distal amplitude contractions greater than 37 (29–31). A 24-h pH monitoring was performed by a Digitrapper™ (Medtronic Minneapolis, MN, USA) pH-Z with a Versaflex catheter. We considered pathological finding any DeMeester score higher than 14.7 and any abnormal pH higher than 1.6% of reflux (32).

Statistical approach

Descriptive statistic was performed, and categorical variables were compared using the chi-squared test or Fisher’s exact test. Continuous variables including age, BMI, disease evolution, questionnaires, neutrophil to lymphocyte ratio (NLR), pneumatic dilation sessions, esophageal dilation, basal lower esophageal sphincter (LES) pressure, IRP, and distal contractile integral analysis were performed using the Kruskal–Wallis one-way ANOVA on ranks. All the pairwise multiple comparison procedures were done by Dunn or Holm–Sidak method. Correlations among age, BMI, disease evolution, questionnaires, NLR, basal LES pressure, IRP, and distal contractile integral analysis were done using the Pearson correlation coefficient. Statistical analyses were performed using the Sigma Stat 14.5 program (Aspire Software International, Leesburg, VA, USA). Data are expressed as the median, range, and mean ± SD/SEM. P-values less than or equal to 0.05 were considered significant.

We then plotted the incidence of chest pain frequency (none, occasional, daily, and every meal) at the different evaluations as shown in Figures 2A,B and compared these symptoms to dysphagia frequency (using the same time frame) as shown in Figure 2B. To determine the differences between the presurgical score and 1-month post-surgery, McNemar–Bowker’s test was performed. Due to the losses of the patients, the results at 6-, 12-, and 24-months post-surgery only are shown as a descriptive analysis. For dysphagia, only pre-surgery vs. 1-month post-surgery collapsing to 4 boxes for expected values less than 1. To estimate the predictive value of pre- and postoperative patient characteristics and account for multiple chest pain reports during follow-up, we implemented a binary logistic regression model including non-adjusted and adjusted (age, type of achalasia, dysphagia, esophageal shape, and IRP were adjusted) models using IBM SPSS version 24.0 program (33).

FIGURE 1

Figure 1. Presurgical chest pain according to the type of achalasia.

FIGURE 2

Figure 2. (A) Chest pain and (B) dysphagia at presurgery, 1-, 6-, 12-, and 24-month post-surgery.

Results

Patient characteristics and long-term chest pain incidence

As we previously reported, in a 2-year follow-up, the outcome of LHM with partial Dor or Toupet fundoplications had comparable improvement in symptom scores and HRM parameters. It was very effective and safe (34). A detailed description of our cohort at presurgery is available in Table 1. Of 129 evaluated cases, type II achalasia (61%) was the most prevalent, followed by type I achalasia (37%; Figure 1). Chest pain (84%) was the second most common symptom presurgically behind dysphagia (100%; Figures 2A,B). When the group was divided into patients without (n = 21) and with chest pain (occasional pain, daily pain, and pain with every meal; n = 108), it was found that patients with pain had an Eckardt score (9.2 ± 2.2 vs. 8.0 ± 4.5; P < 0.050), GERD-HRQL score (26.1 ± 12.3 vs. 13.8 ± 6.6; P < 0.050), and EAT score (31.1 ± 8.3 vs. 21.2 ± 8.3; P < 0.050) higher than patients without chest pain (Table 1).

TABLE 1

Table 1. Presurgical characteristics of the study population according to chest pain.

There was no difference between the length of the esophageal myotomy, gastric myotomy, and full myotomy (Supplementary Table 1). There was no difference in the number of patients with a Dor fundoplication (63%) vs. Toupet (47%).

A 1 month after surgery, the number of patients without chest pain increased 3-fold (n = 69) compared to presurgery patients (n = 21; Figures 2A,B). Dysphagia decreased in patients without and with chest pain (25 and 64 vs. 100%; P < 0.00001; Figure 3 and Supplementary Table 1) compared to presurgery. Patients without chest pain had lower Eckardt score (1.2 ± 1.3 vs. 3.0 ± 2.3; P < 0.001; Supplementary Table 1), GERD-HRQL score (3.1 ± 4.5 vs. 5.9 ± 5.4 P = 0.001; Table 2), and EAT score (2.1 ± 1.3 vs. 5.6 ± 7.1; P = 0.004; Supplementary Table 1) than patients with chest pain.

FIGURE 3

Figure 3. Pain evolution.

TABLE 2

Table 2. Non-adjusted logistic regression analysis of occasional chest pain vs. no pain at 12 months after surgery (n = 66).

A 6 months after surgery, the patients without chest pain (n = 50) had lower Eckardt score (1.1 ± 1.5 vs. 2.8 ± 1.8; P < 0.001; Table 3), EAT score (1.3 ± 2.2 vs. 5.6 ± 7.2; P = 0.002; Supplementary Table 2), and DeMeester score > 14.72 [21.8 ± 4.3 (n = 7) vs. 45.5 ± 29.6 (n = 6); P = 0.044; Supplementary Table 2] than patients with chest pain (n = 41).

TABLE 3

Table 3. Adjusted logistic regression analysis of occasional chest pain vs. no pain at 12 months after surgery associated with presurgical chest pain (n = 66).

A 12 months after surgery, the patients without chest pain (n = 37) had lower Eckardt score (0.8 ± 1.3 vs. 2.3 ± 1.7; P < 0.001; Supplementary Table 3) and disease evolution (24.6 ± 22.6 vs. 25.9 ± 16.0 months; P = 0.004; Supplementary Table 3) than patients with chest pain (n = 29). The number of patients with dysphagia and without chest pain was also lower (38 vs. 66%; P = 0.0464; Figure 3 and Supplementary Table 3) compared with patients with dysphagia and chest pain.

A 24 months after surgery, the patients without chest pain (n = 32) remained with a sustained reduction in the score of the questionnaires Eckardt score (0.9 ± 1.2 vs. 3.0 ± 1.8; P < 0.001; Supplementary Table 4), GERD-HRQL score (4.5 ± 6.9 vs. 7.2 ± 4.3; P = 0.003; Supplementary Table 4), and EAT score (2.6 ± 4.9 vs. 5.1 ± 4.7; P = 0.011; Supplementary Table 4) compared with patients with chest pain (n = 28).

The chest pain with every meal decreased at 1-, 6-, 12-, and 24-month post-surgery compared with presurgery (4.3, 3.3, 1.5, 1.7 vs. 31.8%; P < 0.0001; Figure 2A). The daily chest pain also decreased at 1-, 6-, 12-, and 24-month post-surgery vs. presurgery (4.3, 0, 3.0, 3.3 vs. 10.1%; Figure 2A). Conversely, the percentage of patients who did not have chest pain increased at 1-, 6-, 12-, and 24-month post-surgery vs. presurgery (57.3, 54.9, 56.1, 53.3 vs. 16.3%; P < 0.0001; Figure 2A; McNemar–Bowker: presurgery vs. 1 month X² = 61.8^6fd P < 0.0001).

The evolution of chest pain in patients with achalasia during the first year is shown in Figure 3.

Regarding dysphagia with every meal and daily dysphagia diminished at 1-, 6-, 12-, and 24-month post-surgery compared with presurgery (Figure 1B, McNemar: presurgery vs. 1 month with every meal or daily vs. occasional or no pain X² 99.1_1fd P = 001). Dysphagia disappeared at 1-, 6-, 12-, and 24-month post-surgery in 57.3, 45.1, 46.2, and 45.0% of patients, while all the patients had dysphagia before surgery (Figure 2B).

Correlation between chest pain and Eckardt score

We found positive correlation between the chest pain and Eckardt score (Pearson’s r = 0.641, P = 1.741e^–13 at presurgery; r = 0.656, P = 3.264e^–6 at 6 months post-surgery; r = 0.521, P = 3.740e^–3 at 12 months post-surgery; and r = 0.565, P = 1.720e^–3 at 24 months post-surgery). We did not find significant correlations between GERD-HRQL and EAT-10 scores, age, BMI, disease evolution, NLR, basal LES pressure, IRP, and distal contractile integral.

Predictive value of clinical characteristics

The pre- and postoperative patient characteristics with significant predictive value were analyzed in a binary logistic regression model, including non-adjusted and adjusted (age, type of achalasia, dysphagia, esophageal shape, and IRP) models at 12 months post-surgery. Results are shown in Tables 2, 3, respectively.

Preoperative chest pain with every meal was associated with an increased risk of occasional postoperative chest pain [unadjusted model: odds ratio (OR) = 12, 95% CI: 2.2–63.9, P = 0.006; adjusted model: OR = 26, 95% CI: 2.6–259.1; P = 0.005].

Preoperative episodic angina-like retrosternal pain daily was associated with an increased risk of occasional postoperative chest pain (unadjusted model: OR = 6.4, 95% CI: 0.8–45.9, P = 0.06; adjusted model: OR = 5.2, 95% CI: 0.4–72.9, P = 0.22).

Preoperative occasional chest pain was associated with an increased risk of occasional postoperative chest pain (unadjusted model: OR = 6.7, 95% CI: 1.3–33.2, P = 0.02; adjusted model: OR = 12.4, 95% CI: 1.3–116.4, P = 0.028).

In type II achalasia, hypercontraction was also associated with an increased risk of chest pain (unadjusted model: OR = 2.6 e⁹ in all the patients). No significant differences were associated with age, type of achalasia, dysphagia, esophageal shape, and IRP with an increased risk of occasional postoperative chest pain. Also, there was no significant difference between fundoplication techniques or surgical approaches (e.g., length of myotomy).

A multiple linear regression analysis at 24 months was performed to examine the influence of age, disease evolution (months), BMI, GERD-HRQL, GERD pyrosis, EAT-10, Eckardt score, dysphagia, basal LES pressure, IRP, amplitude distal contractions, and distal contractile integral (DCI) on the variable chest pain. The regression model showed that the variables explained 89.32% of the variance from the chest pain variable. An ANOVA was used to test whether this value differed significantly from zero. The present sample showed that the effect was significantly different from zero, F = 8.36, P ≤ 0.001, R² = 0.89 (Supplementary Tables 5–7).

Discussion

This study evaluated the long-term incidence of chest pain after a laparoscopic myotomy and fundoplication for achalasia. We built upon prior works identifying critical clinical factors associated with this symptom, pre- and post-surgical. However, we implemented a comprehensive approach by analyzing the risk for multiple symptom recurrence up to 24 months post-LHM. By this approach, preoperative pain frequency positively predicted postoperative episodic angina-like retrosternal pain persistence. We also found a positive correlation between chest pain and Eckardt score in each time evaluated. Notwithstanding our comprehensive approach, in our study, other clinical features with a significant association in prior works (12–20) were not predictive factors. There was no significant association between other patients (age, sex, achalasia features, HRM, and pHmetry findings), and postoperative (fundoplication techniques or surgical approach, serial upper endoscopies, and HRMs) characteristics with chest pain.

The cause and mechanism of episodic angina-like retrosternal pain in achalasia or other esophageal motility disorders remain poorly understood (16). Several clinical reports support that high amplitude, repetitive contractions stimulating esophageal mechanoreceptors might be a critical pathogenesis pathway (12, 13, 15, 16). However, there have been some challenges to this theory – first, a weak correlation between chest pain prevalence and the degree of esophageal motor abnormalities and function. For instance, identical LES pressures and esophageal body diameters have been documented between cases with chest pain and those without chest pain (12). Second, the lack of association between pain episodes and altered esophageal contraction amplitudes (12). Last, the persistence of this symptom despite the disappearance of abnormal contractions and/or dysphagia (12). Our study supports this mechanism since a hypercontractile esophagus significantly increased the chest pain risk by 2.6 e⁹. This predictive factor was independent of age and sex. Especially, age independence is crucial since several reports describe an age-dependent relation to chest pain incidence (12, 14). It has also been suggested that as the disease progresses and esophageal dilatation develops, esophageal contractions decrease amplitude, and chest pain eventually subsides in most patients (15). We did not observe that dysphagia increased the risk of chest pain.

Laparoscopic Heller myotomy significantly benefits dysphagia with a response rate of approximately 90% (19, 25, 34–37). Moreover, chest pain improvement has also been reported (15, 21, 38, 39).

Like other cohorts, chest pain prevalence preoperatively was 81%, and post-surgical fluctuated between 17 and 76%. However, the latter was experienced occasionally. Our results agree with prior research demonstrating that LHM immediately impacts the short postoperative period, especially for daily and every meal symptoms (16). However, we evidenced that this benefit is significant for the latter. By the 48th month, three out of four patients will intermittently complain about this symptom. Nevertheless, postoperatively, dysphagia in the long term was occasionally experienced, arguing for reasonable control. The significance of complete remission in patient pain reporting warrants future studies.

One limitation of our study is that we did not follow-up our cohort with a timed barium esophagogram. This could provide valuable insights into the effect of esophageal emptying that need future dissection. However, we preferred implementing pHmetry and HRM assessments over timed barium esophagograms for completeness in information in this matter. Moreover, at the 48th month of follow-up, we had only information on 28% (33/118) of individuals. Hence, our incidence estimations may be biased in this stratum. Nevertheless, our study contributes to long-term assessments evidencing trends described above, not previously reported.

Data availability statement

The raw data supporting the conclusions of this article will be made available by the authors, without undue reservation.

Ethics statement

The studies involving human participants were reviewed and approved by the Ethics and Research Committee of the Salvador Zubirán National Institute of Medical Sciences and Nutrition. The patients/participants provided their written informed consent to participate in this study.

Author contributions

HO-P, JP-F, SN-C, AP-O, and MR-M performed the analysis and interpretation of the data, responsible for the study conception and design, and wrote the manuscript. HO-P, JP-F, SN-C, JF-C, MN-P, AT-D, RA-S, FL-V, EC-A, and MV collected patient’s data from the clinical files, created the database, analyzed and interpreted the data, and wrote the manuscript. GT-V analyzed the data, wrote the manuscript, critically revised the manuscript for important intellectual content, and was responsible for the study conception and design. All authors contributed to the article and approved the submitted version.

Conflict of interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Publisher’s note

All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.

Supplementary material

The Supplementary Material for this article can be found online at: https://www.frontiersin.org/articles/10.3389/fmed.2022.941581/full#supplementary-material

References

1. Pandolfino JE, Gawron AJ. Achalasia: A systematic review. JAMA. (2015) 313:1841–52. doi: 10.1001/jama.2015.2996

PubMed Abstract | CrossRef Full Text | Google Scholar

2. Schlottmann F, Patti MG. Esophageal achalasia: Current diagnosis and treatment. Expert Rev Gastroenterol Hepatol. (2018) 12:711–21. doi: 10.1080/17474124.2018.1481748

PubMed Abstract | CrossRef Full Text | Google Scholar

3. Zaninotto G, Bennett C, Boeckxstaens G, Costantini M, Ferguson MK, Pandolfino JE, et al. The 2018 ISDE Achalasia guidelines. Dis Esophagus. (2018) 31:1–29. doi: 10.1093/dote/doy071

PubMed Abstract | CrossRef Full Text | Google Scholar

4. Boeckxstaens GE, Zaninotto G, Richter JE. Achalasia. Lancet. (2014) 383:83–93. doi: 10.1016/S0140-6736(13)60651-0

CrossRef Full Text | Google Scholar

5. Furuzawa-Carballeda J, Torres-Landa S, Valdovinos MÁ, Coss-Adame E, Del Campo LAM, Torres-Villalobos G. New insights into the pathophysiology of achalasia and implications for future treatment. World J Gastroenterol. (2016) 22:7892–907. doi: 10.3748/wjg.v22.i35.7892

PubMed Abstract | CrossRef Full Text | Google Scholar

6. Romero-Hernández F, Furuzawa-Carballeda J, Hernández-Molina G, Alejandro-Medrano E, Núñez-Álvarez CA, Hernández-Ramírez DF, et al. Autoimmune comorbidity in achalasia patients. J Gastroenterol Hepatol. (2018) 33:203–8. doi: 10.1111/jgh.13839

PubMed Abstract | CrossRef Full Text | Google Scholar

7. Furuzawa-Carballeda J, Boon L, Torres-Villalobos G, Romero-Hernández F, Ugarte-Berzal E, Martens E, et al. Gelatinase B/matrix metalloproteinase-9 as innate immune effector molecule in achalasia. Clin Transl Gastroenterol. (2018) 9:208. doi: 10.1038/s41424-018-0076-6

PubMed Abstract | CrossRef Full Text | Google Scholar

8. Furuzawa-Carballeda J, Aguilar-León D, Gamboa-Dominguez A, Valdovinos MA, Nuñez-Álvarez C, Martín-del-Campo LA, et al. Achalasia – an autoimmune inflammatory disease: A cross-sectional study. J Immunol Res. (2015) 2015:729217. doi: 10.1155/2015/729217

PubMed Abstract | CrossRef Full Text | Google Scholar

9. Furuzawa-Carballeda J, Zuñiga J, Hernández-Zaragoza DI, Barquera R, Marques-García E, Jiménez-Alvarez L, et al. An original Eurasian haplotype, HLA-DRB114:54-DQB105:03, influences the susceptibility to idiopathic achalasia. PLoS One. (2018) 13:e0201676. doi: 10.1371/journal.pone.0201676

PubMed Abstract | CrossRef Full Text | Google Scholar

10. Sadowski DC, Ackah F, Jiang B, Svenson LW. Achalasia: Incidence, prevalence and survival. A population-based study. Neurogastroenterol Motil. (2010) 22:256–61. doi: 10.1111/j.1365-2982.2010.01511.x

PubMed Abstract | CrossRef Full Text | Google Scholar

11. Patel DA, Naik R, Slaughter JC, Higginbotham T, Silver H, Vaezi MF. Weight loss in achalasia is determined by its phenotype. Dis Esophagus. (2018) 31:1–8. doi: 10.1093/dote/doy046

PubMed Abstract | CrossRef Full Text | Google Scholar

12. Eckardt VF, Stauf B, Bernhard G. Chest pain in achalasia: Patient characteristics and clinical course. Gastroenterology. (1999) 116:1300–4. doi: 10.1016/S0016-5085(99)70493-2

CrossRef Full Text | Google Scholar

13. Papo M, Mearin F, Castro A, Armengol JR, Malagelada JR. Chest pain and reappearance of esophageal peristalsis in treated achalasia. Scand J Gastroenterol. (1997) 32:1190–4. doi: 10.3109/00365529709028145

PubMed Abstract | CrossRef Full Text | Google Scholar

14. Nylander DL. Chest pain in achalasia is an age-dependent phenomenon. Gastroenterology. (1999) 117:1259. doi: 10.1016/S0016-5085(99)70429-4

CrossRef Full Text | Google Scholar

15. Perretta S. Achalasia and chest pain: Effect of laparoscopic Heller myotomy. J Gastrointest Surg. (2003) 7:595–8. doi: 10.1016/S1091-255X(03)00073-8

CrossRef Full Text | Google Scholar

16. Omura N, Kashiwagi H, Tsuboi K, Ishibashi Y, Kawasaki N, Yano F, et al. Therapeutic effects of a laparoscopic heller myotomy and dor fundoplication on the chest pain associated with achalasia. Surg Today. (2006) 36:235–40. doi: 10.1007/s00595-005-3122-4

PubMed Abstract | CrossRef Full Text | Google Scholar

17. Sasaki A, Obuchi T, Nakajima J, Kimura Y, Koeda K, Wakabayashi G. Laparoscopic heller myotomy with dor fundoplication for achalasia: Long-term outcomes and effect on chest pain. Dis Esophagus. (2010) 23:284–9. doi: 10.1111/j.1442-2050.2009.01032.x

PubMed Abstract | CrossRef Full Text | Google Scholar

18. Arain MA, Peters JH, Tamhankar AP, Portale G, Almogy G, DeMeester SR, et al. Preoperative lower esophageal sphincter pressure affects outcome of laparoscopic esophageal myotomy for achalasia. J Gastrointest Surg. (2004) 8:328–34. doi: 10.1016/j.gassur.2003.09.011

PubMed Abstract | CrossRef Full Text | Google Scholar

19. Omura N, Kashiwagi H, Yano F, Tsuboi K, Ishibashi Y, Hoshino M, et al. Effect of laparoscopic esophagomyotomy on chest pain associated with achalasia and prediction of therapeutic outcomes. Surg Endosc. (2011) 25:1048–53. doi: 10.1007/s00464-010-1314-5

PubMed Abstract | CrossRef Full Text | Google Scholar

20. Wuller C, Bessell JR, Watson DI. Chest pain before and after laparoscopic cardiomyotomy for achalasia. ANZ J Surg. (2011) 81:590–4. doi: 10.1111/j.1445-2197.2010.05577.x

PubMed Abstract | CrossRef Full Text | Google Scholar

21. Lam HG, van Berge Henegouwen GP, Smout AJ. Chest pain of oesophageal origin. Neth J Med. (1993) 42:134–45.

Google Scholar

22. Parrilla Paricio P, Martinez de Haro LF, Ortiz Escandell A, Morales Cuenca G, Molina Martinez J. Short myotomy for vigorous achalasia. Br J Surg. (1993) 80:1540–2. doi: 10.1002/bjs.1800801215

PubMed Abstract | CrossRef Full Text | Google Scholar

23. Douard R, Gaudric M, Chaussade S, Couturier D, Houssin D, Dousset B. Functional results after laparoscopic Heller myotomy for achalasia: A comparative study to open surgery. Surgery. (2004) 136:16–24. doi: 10.1016/j.surg.2004.01.011

PubMed Abstract | CrossRef Full Text | Google Scholar

24. Eckardt VF. Clinical presentations and complications of achalasia. Gastrointest Endosc Clin N Am. (2001) 11:281–92.

Google Scholar

25. Torres-Villalobos G, Coss-Adame E, Furuzawa-Carballeda J, Romero-Hernández F, Blancas-Breña B, Torres-Landa S, et al. Dor Vs Toupet fundoplication after laparoscopic heller myotomy: Long-term randomized controlled trial evaluated by high-resolution manometry. J Gastrointest Surg. (2018) 22:13–22. doi: 10.1007/s11605-017-3578-8

PubMed Abstract | CrossRef Full Text | Google Scholar

26. Eckardt VF, Aignherr C, Bernhard G. Predictors of outcome in patients with achalasia treated by pneumatic dilation. Gastroenterology. (1992) 103:1732–8. doi: 10.1016/0016-5085(92)91428-7

CrossRef Full Text | Google Scholar

27. Velanovich V, Vallance SR, Gusz JR, Tapia FV, Harkabus MA. Quality of life scale for gastroesophageal reflux disease. J Am Coll Surg. (1996) 183:217–24.

Google Scholar

28. Belafsky PC, Mouadeb DA, Rees CJ, Pryor JC, Postma GN, Allen J, et al. Validity and reliability of the eating assessment tool (EAT-10). Ann Otol Rhinol Laryngol. (2008) 117:919–24. doi: 10.1177/000348940811701210

PubMed Abstract | CrossRef Full Text | Google Scholar

29. Sanderson DR, Ellis FH, Schlegel JF, Olsen AM. Syndrome of vigorous achalasia: Clinical and physiologic observations. Dis Chest. (1967) 52:508–17. doi: 10.1378/chest.52.4.508

PubMed Abstract | CrossRef Full Text | Google Scholar

30. Fisichella PM, Raz D, Palazzo F, Niponmick I, Patti MG. Clinical, radiological, and manometric profile in 145 patients with untreated achalasia. World J Surg. (2008) 32:1974–9. doi: 10.1007/s00268-008-9656-z

PubMed Abstract | CrossRef Full Text | Google Scholar

31. Goldenberg SP, Burrell M, Fette GG, Vos C, Traube M. Classic and vigorous achalasia: A comparison of manometric, radiographic, and clinical findings. Gastroenterology. (1991) 101:743–8. doi: 10.1016/0016-5085(91)90534-R

CrossRef Full Text | Google Scholar

32. Liakakos T, Karamanolis G, Patapis P, Misiakos EP. Gastroesophageal reflux disease: Medical or surgical treatment? Gastroenterol Res Pract. (2009) 2009:371580. doi: 10.1155/2009/371580

PubMed Abstract | CrossRef Full Text | Google Scholar

33. Ibm Corp. IBM SPSS Statistics for Windows, Version 24.0. Armonk, NY: IBM Corp (2016).

Google Scholar

34. Torres-Villalobos G, Martin-Del-Campo LA. Surgical treatment for achalasia of the esophagus: Laparoscopic heller myotomy. Gastroenterol Res Pract. (2013) 2013:708327. doi: 10.1155/2013/708327

PubMed Abstract | CrossRef Full Text | Google Scholar

35. Finley RJ, Clifton JC, Stewart KC, Graham AJ, Worsley DF. Laparoscopic Heller myotomy improves esophageal emptying and the symptoms of achalasia. Arch Surg. (2001) 136:892–6. doi: 10.1001/archsurg.136.8.892

PubMed Abstract | CrossRef Full Text | Google Scholar

36. Patti MG, Pellegrini CA, Horgan S, Arcerito M, Omelanczuk P, Tamburini A, et al. Minimally invasive surgery for achalasia: An 8-year experience with 168 patients. Ann Surg. (1999) 230:584–7. doi: 10.1097/00000658-199910000-00014

PubMed Abstract | CrossRef Full Text | Google Scholar

37. Richards WO, Torquati A, Holzman MD, Khaitan L, Byrne D, Lutfi R, et al. Heller myotomy versus heller myotomy with dor fundoplication for achalasia: A prospective randomized double-blind clinical trial. Ann Surg. (2004) 240:405–15. doi: 10.1097/01.sla.0000136940.32255.51

CrossRef Full Text | Google Scholar

38. Fernández AF, Martínez MA, Ruiz J, Torres R, Faife B, Torres JR, et al. Six years of experience in laparoscopic surgery of esophageal achalasia. Surg Endosc Other Interv Tech. (2003) 17:153–6. doi: 10.1007/s00464-002-8576-5

PubMed Abstract | CrossRef Full Text | Google Scholar

39. Hoshino M, Omura N, Yano F, Tsuboi K, Yamamoto SR, Akimoto S, et al. Needlescopic versus conventional laparoscopic Heller–Dor procedure for achalasia: A propensity score-matched analysis. Surg Today. (2020) 50:721–5. doi: 10.1007/s00595-019-01945-z

PubMed Abstract | CrossRef Full Text | Google Scholar