Abstract
Esophageal spasm is a rare esophageal motility disorder associated with dysphagia and chest pain that is characterized on esophageal manometry by uncoordinated and/or vigorous esophageal contractions. Diagnostic criteria and clinical significance of spastic esophageal disorders (which have included distal esophageal spasm and “nutcracker” or “jackhammer” esophagus) have fluctuated over time, which has contributed to the challenges associated with clinical management. This chapter describes the epidemiology, diagnosis, and management strategies associated with spastic esophageal motility disorders.
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Introduction
Chest pain often delivers a frightening patient experience due to its connection with life-threatening cardiovascular disease. Once cardiovascular disease and other life-threatening entities are excluded as an etiology, an esophageal origin of the noncardiac chest pain is often considered. Although gastroesophageal reflux and functional chest pain are the most common causes of esophageal chest pain, spastic esophageal motility disorders, such as distal esophageal spasm (DES), nutcracker esophagus , or hypercontractile ( jackhammer), are also sometimes considered as a possible etiology [1, 2]. However, these spastic esophageal motility disorders can be associated with diagnostic and therapeutic challenges related to their overall rarity and clinical heterogeneity.
Patient question: I was worried I was having a heart attack, but I wasn’t. I was told esophageal spasms could be causing my chest pain—what is esophageal spasm?
Suggested response to the patient:
Esophageal spasm means that abnormal contractions of your esophageal muscles may be causing your pain. Normally, your esophageal muscles squeeze in a coordinated fashion to push food down into your stomach: peristalsis. If those contractions become uncoordinated (i.e., spastic) or too strong (i.e., hypercontractile), which may be related to dysfunction of the nerves or muscles of the esophagus, they can cause chest pain often associated with trouble swallowing.
Because esophageal spasm is a disorder of esophageal motility, an esophageal motility test, an esophageal manometry, will be necessary to diagnosis esophageal spasm. However, your symptoms may be related to a different and more common esophageal disorder, such as reflux or esophageal obstruction. Therefore, other tests such as an upper endoscopy and a trial of reflux therapy (i.e., stomach acid suppression) may be tried prior to completing an esophageal manometry.
Esophageal spasm: definition(s) and diagnosis.
The concept of esophageal spasm has fluctuated over time from being nearly synonymous with noncardiac chest pain (and thus overused) in the 1980s to present day being recognized as a specific esophageal motility disorder associated with dysphagia and chest pain [3,4,5,6,7]. While radiographic or endoscopic findings of frequent tertiary contractions or a “corkscrew” esophagus can be suggestive of a spastic motility disorder, definitions and diagnostic criteria of the spectrum of spastic esophageal motility disorders (DES, nutcracker, and jackhammer esophagus) are based on esophageal manometry (Table 2.1) [5, 7]. However, diagnostic criteria have varied among reports which limits a consistent description of specific disease characteristics or response to treatments among historic reports.
Esophageal symptoms, including chest pain, can be nonspecific when it comes to identifying the underlying pathology. Therefore, an initial evaluation should include a careful upper endoscopy to evaluate for a potential mechanical obstruction (e.g., stricture, hiatal hernia), as well as esophageal biopsies to evaluate for eosinophilic esophagitis (especially with coexisting dysphagia). Supplementary imaging, such as barium esophagram, may also be helpful to exclude an esophageal mechanical obstruction and may provide suggestive evidence for a spastic motility disorder, i.e., tertiary contractions, or rarely a corkscrew appearance [8, 9]. Additionally, gastroesophageal reflux disease is a common cause of esophageal chest pain and thus empiric trial of reflux therapy (i.e., proton pump inhibitor, PPI) or objective testing for reflux (esophageal pH testing) should be considered [10].
Esophageal manometry is the primary test to establish a diagnosis of a spastic esophageal motility disorder [5, 7]. Achalasia (particularly spastic, vigorous, or type III achalasia) could be considered within a spectrum of spastic motility disorders and may share some clinical features, such as an association with esophageal chest pain. Nonetheless, the spastic motility disorders described in the remainder of this chapter (DES, nutcracker esophagus, and jackhammer) should be considered differentiated from achalasia primarily based on normal deglutitive lower esophageal sphincter (LES) pressures on manometry.
With conventional, line-tracing manometry, simultaneous contraction (often defined by a rapid propagation velocity) was the typical diagnostic criterion for DES (Fig. 2.1) though (a) repetitive, (b) multi-peaked, (c) high-amplitude, (d) prolonged-duration, or (e) spontaneous contractions, in addition to required intermittent normal peristalsis, were also occasionally incorporated [3, 5]. Some overlap can be appreciated with the criteria for nutcracker esophagus, which is characterized by high-amplitude contractions, but also sometimes repetitive or long-duration contractions [5].
More recently, high-resolution manometry (HRM) and associated esophageal pressure topography (EPT) have provided enhanced depiction of esophageal motility characteristics and subsequently revised concepts (and subsequently diagnostic criteria) for esophageal motility disorders. Thus, utilizing the improved spatial resolution of HRM, rapidly propagating (simultaneous) esophageal contractions were identified as a nonspecific finding often found in patients with otherwise weak or normal peristalsis [11]. Alternatively, premature swallows, which were defined by a reduced distal latency (the time interval from the onset of swallow to the contractile deceleration point, i.e., end of the fast component of esophageal peristalsis, Fig. 2.1) appeared to represent a distinct pathophysiologic manifestation of abnormal inhibitory innervation [11, 12] and now entail a chief criterion for DES.
Additionally, contractile vigor can be assessed with HRM as a composite measure of pressure amplitude (mm Hg) × contraction duration (s) × contractile length (cm): the distal contractile integral (DCI). Thus, the extreme clinical phenotype of esophageal hypercontractility is defined by swallows of a greater vigor (as defined by elevated DCI) than those observed in asymptomatic controls [7, 13]. Sometimes associated with repetitive or multi-peaked contractions this motility pattern was termed jackhammer esophagus ; thus, it appears possible that this entity may have been represented in former studies describing DES by repetitive, high-amplitude, repetitive and/or long-duration contractions on conventional manometry .
It is worth noting that studies that described DES or nutcracker esophagus using conventional manometry with a single LES pressure sensor (i.e., without the use of an LES pressure sleeve, which was most of them) were susceptible to misidentifying achalasia patients due to the manometric measurement phenomenon known as LES “pseudorelaxation ” (Fig. 2.2): the erroneous but apparent decrease in “LES” pressure related to proximal migration of the LES during swallow-associated esophageal shortening, which can be profound in patients with achalasia.
Finally, while the diagnosis of spastic motility disorders is typically defined by stationary esophageal manometry, symptom-associated or abnormal spastic esophageal contractions may occur infrequently and thus outside a 10–15 swallow manometry study. Consequently, an increased diagnostic yield has been reported for DES by increasing the manometric testing period, and even prolonged, ambulatory manometry (Fig. 2.3) [14,15,16]. A recent study evaluating stationary HRM and 24-h ambulatory manometry with pH impedance identified esophageal spasm (symptom-associated, simultaneous, and often multi-peaked or repetitive contractions of at least >100 mm Hg and lasting at least 3 s) on ambulatory manometry in 7% (4/59) of patients [16]. None of the 59 patients met the diagnostic criteria for a spastic motility disorder on stationary HRM, though three of the four patients with DES on ambulatory manometry had subtle contractile abnormalities on stationary HRM. However, patient tolerance to prolonged manometry catheter placement and limited availability remain limitations of utilizing ambulatory manometry in typical clinical practice.
Epidemiology of Esophageal Spasm
Noncardiac chest pain, often attributed to chest pain of an esophageal origin, is a common entity with an approximately 13% worldwide prevalence [17]. The majority of esophageal chest pain is related to gastroesophageal reflux or functional chest pain [1, 2]. On the other hand, primary manometric diagnoses of spastic esophageal motility disorders make up only a small proportion of noncardiac chest pain patients, though information regarding the epidemiology of spastic esophageal motility disorders relates to the diagnostic criteria applied, and thus may fluctuate over the course of evolving diagnostics definitions.
Using conventional manometry criteria, a recent study of 350 consecutive patients undergoing manometry from 2012 to 2013 found DES (defined by simultaneous contractions) in 3% and nutcracker esophagus (defined by mean distal wave amplitude >220 mm Hg) in 3% [18]. As a reference, achalasia, which has an estimated incidence rate of about 1/100,000 person-years, was found in 8% of the 350 patients [18, 19].
With HRM evaluation and criteria, DES with premature contractions (reduced distal latency) in ≥20% of swallows was found in 0.5% (n = 6) of 1070 patients without previous foregut surgery [11]. Among the same HRM cohort, 44/1070 (4.1%) had at least one hypercontractile (DCI > 8000 mm Hg s cm) swallow; [13] thus under the current HRM diagnostic criteria requiring ≥20% of hypercontractile swallows, hypercontractile esophagus would be expected to be diagnosed even more infrequently [7]. Again for reference, incident achalasia was diagnosed in 99/1000 (10%) of consecutive HRMs from the same center [20].
Therefore, spastic esophageal motility disorders ultimately reflect rare disorders encompassing even a small portion (<5%) of all patients undergoing esophageal manometry. Reports of higher rates should raise questions about diagnostic interpretation (particularly with DES and correct identification of the contractile deceleration point and subsequent measurement of the distal latency).
Pathophysiology
The pathophysiologic mechanism(s) behind spastic or hypercontractile esophageal motility disorders remain incompletely understood though multiple hypotheses have been suggested. In addition to esophageal neuromuscular dysfunction or imbalance, associations of spastic motility disorders to esophageal obstruction or gastroesophageal reflux are reported. Thus a fundamental question is posed when spastic manometric features are identified: primary esophageal motility disorder or secondary response to another (potentially subtle) esophageal stimuli?
Neuromuscular dysregulation is thought to be the pathologic foundation of primary esophageal motility disorders (e.g., achalasia) and is also hypothesized to be a pathologic mechanism of DES and hypercontractile esophageal disorders. Impaired inhibitory innervation among patients with simultaneous contractions (DES) was supported by an elegant study demonstrating abnormalities of distal contractile latency and in the expected deglutitive inhibition with paired swallows [12]. Further, spontaneous contractions were induced by cholinergic (excitatory) stimulation in both DES and patients with normal motility and spontaneous contractions were inhibited by cholinergic blockade in DES patients [12]. Another study evaluating esophageal muscle specimens of patients with nutcracker esophagus found an increased ratio of cholinergic (excitatory) to nitronergic (inhibitory) protein immunostaining compared with patients with normal manometries, thus supporting a role of neural signaling imbalance within nutcracker esophagus as well [21]. However, another study evaluating esophagectomy specimens for refractory esophageal chest pain found normal esophageal ganglion among patients with DES (n = 2) and nutcracker esophagus (n = 4) [22].
Abnormal muscular function has also been proposed as a pathologic mechanism in spastic motility disorders. Thickened circular esophageal muscle has been observed in patients with DES, nutcracker, and jackhammer esophagus [23, 24]. Additionally, asynchrony between circular and longitudinal muscle contraction was reported in patients with nutcracker esophagus using a sophisticated simultaneous manometry with high-frequency intraluminal ultrasound technique [25]; further, this muscular asynchrony was able to be induced with cholinergic stimulation (edrophonium) and reversed with cholinergic inhibition (atropine). Therefore, a contribution of reduced esophageal inhibitory and/or excess excitatory innervation appears to be related to the underlying mechanism of spastic motility disorders.
Additionally, simultaneous, repetitive, and hypertensive esophageal contractions have been reported in both animal models and humans with esophageal obstruction. In cats and opossum, simultaneous, repetitive, multi-peaked, and increased wave amplitude contractions were induced following creation of a distal esophageal obstruction [26,27,28]. In humans, an intriguing study utilizing HRM on patients with laparoscopic adjustable gastric bands (LABG) reported inducing repetitive and hypertensive contractions when inducing an esophageal obstruction by overfilling the gastric band [29].
The association of spastic motility features with reflux has also been reported. Objective evidence of reflux (esophagitis or abnormal esophageal pH testing) or a symptomatic response to reflux-targeted therapy (PPI or fundoplication) was reported among patients with DES, nutcracker, and jackhammer esophagus [13, 30, 31]. Further, a previous study utilizing combined manometry and acid perfusion reported provocation of chest pain and spastic motility patterns (simultaneous and repetitive contractions) among patients with a normal manometry at baseline [32]. Thus, the demonstration that the typical manometric features of spastic motility disorders can be induced by esophageal obstruction and esophageal acid exposure supports the notion that these spastic manometric features can also represent a secondary esophageal response.
Beyond the mechanisms behind spastic esophageal contractions, the generation of symptoms, particularly chest pain, among these spastic motility disorders also remains incompletely understood, particularly as esophageal symptoms are not consistently associated with objectively measured abnormal esophageal contractions [33]. Esophageal tissue ischemia was proposed as a mechanism of symptom generation based on a sophisticated study that demonstrated reduced esophageal wall blood perfusion in patients with nutcracker esophagus compared with asymptomatic controls [34]; further, controls had an increase in esophageal blood perfusion during meals which appeared to be blunted in the nutcracker patients.
Esophageal hypersensitivity also appears to be a contributing factor to symptom generation. Patients with nutcracker esophageal showed a lower pain threshold to intraesophageal balloon distension than in healthy controls [35]. Additionally, symptomatic improvement without changes in spastic manometric findings following therapy with trazodone, an antidepressant without effects on esophageal motor function (e.g., anticholinergic properties), supports a component of hypersensitivity [36].
Ultimately, the mechanisms behind spastic and hypertensive esophageal contractions are complex and likely multifactorial. Therefore multimodal management strategies may need to be applied.
Patient question: How is esophageal spasm treated?
Suggested response to the patient:
The treatment of esophageal spasm typically targets the abnormal esophageal contractions, and thus begins with medications to relax the esophageal muscles. However, esophageal targeted smooth muscle relaxants are limited; thus the medications are used off-label for esophageal symptoms. Therefore the symptomatic benefits need to be gauged against potential side effects, such as lightheadedness and drops in blood pressure. Sometimes injection of botulinum toxin or esophageal surgery is used to diminish the abnormal esophageal contractions. However, given the association of these spastic motility disorders with other causes, for example esophageal obstruction or even esophageal hypersensitivity, further diagnostic evaluation, a trial of esophageal dilation with endoscopy, or trials of medications to treat esophageal sensitivity (antidepressants) might be considered before pursuing more aggressive endoscopic or surgical therapy .
Treatment of Spastic Esophageal Motility Disorders
Following a thorough diagnostic evaluation and consideration for empiric treatment trials, e.g., acid suppression or even empiric dilation, given the potential for an alternate (or secondary) cause of esophageal symptoms and manometric findings, the treatment of primary spastic esophageal motility disorders aims to reduce the spastic or vigorous esophageal contractions. Multiple pharmacologic, endoscopic, or surgical therapies (Table 2.2) are available; thus the typical approach should be to start with less invasive options (i.e., medical therapy) and reserve more invasive endoscopic or surgical approaches for patients with medical-refractory and severely life-altering symptoms. It is worth noting that the majority of clinical studies reported have included only patients defined by conventional manometry criteria; thus generalization of these reports to HRM-defined spastic motility disorders carries potential limitations.
Pharmacologic Therapies
Smooth muscle relaxants are the mainstay of medical therapy for primary spastic motility disorders. These include medications that reduce both LES pressure and contractile amplitude through an attempt to mimic esophageal inhibitory (nitronergic) signaling (e.g., nitrates and phosphodiesterase-5, PDE-5, inhibitors), diminish esophageal excitatory (cholinergic) stimulation (e.g., anticholinergics), or directly relax smooth muscle (calcium channel blockers, CCBs). Unfortunately, there are no presently available medications that specifically target esophageal smooth muscle; thus these medications are used off-label for esophageal symptoms and their use can be limited due to the systemic side effects.
Nitrate use in patients with DES and nutcracker esophagus was associated with symptomatic and manometric improvement (including increased distal latency in DES) in several small, open-label studies [37,38,39]. A placebo-controlled crossover study using diltiazem in patients with DES reported no significant difference in chest pain or dysphagia scores with therapy (however, chest pain and dysphagia did improve in 6/8 and 4/6 patients, respectively) [40]. A reduction in contractile wave amplitude on manometry with CCBs was demonstrated in two placebo-controlled crossover studies with nutcracker; however symptomatic improvement was inconsistent [41, 42]. Sildenafil (a PDE-5 inhibitor) also demonstrated manometric improvement in patients with DES and nutcracker esophagus as well as some symptomatic improvement with open-label, on-demand use [43, 44]. Peppermint oil was also reported to reduce simultaneous contractions in one small study of patients with DES, including symptom resolution during manometry in 2/8 patients [45]. Clinical studies of anticholinergic agents in spastic motility disorders are lacking, though studies of healthy controls have demonstrated reduced contractile pressures with atropine and hyoscyamine [46, 47]. In addition, atropine was demonstrated to reduce wave amplitude and esophageal circular and longitudinal muscle asynchrony [25]. Thus, given the apparent contribution of cholinergic excess in spastic motility disorders, anticholinergic therapy carries some potential benefit.
Smooth muscle relaxants are available in various formulations which can be tailored to the frequency and pattern of patient symptoms. For patients with only infrequent or spontaneous symptoms, on-demand use of sublingual or immediate-release agents can be employed, e.g nitroglycerin, isosorbide, or hyoscyamine. Due to safety concerns observed in the treatment of hypertensive crises, immediate-release nifedipine should be avoided. Therapeutic trials for more frequent symptoms typically start with a low-dose immediate-release formulation with a plan to escalate the dosage every 2–3 days while monitoring tolerance (Table 2.3). The medications are typically dosed prior to meals to facilitate eating. Finally, an effective smooth muscle relaxant should alleviate symptoms shortly after achieving a therapeutic dose; therefore the duration of a therapeutic trial for frequent symptoms should be completed within 1–2 weeks. If the medication is ineffective or poorly tolerated, it should be abandoned. If the medication is effective, converting the dosing to an extended-release formation can be considered for patient convenience.
Finally, treatment with low-dose antidepressants may be beneficial in spastic motility disorders as well. A randomized controlled trial that administered trazodone (a selective serotonin reuptake inhibitor) or placebo for 6 weeks in patients with manometric contractile abnormalities (typically spastic features) demonstrated improvements in esophageal and global symptoms without changes in motility [36]. In addition to supporting the notion that esophageal hypersensitivity may play a role in symptom generation in spastic motility disorders, this produces some appeal for treatment with an antidepressant with more anticholinergic activity (e.g., a tricyclic) to a potential multifactorial benefit. However, clinical study of other antidepressants in esophageal spastic motility disorders is lacking.
Endoscopic Therapy
Endoscopic therapies for spastic motility disorder include esophageal dilation and botulinum toxin injection. Given the potential association of esophageal obstruction with spastic esophageal motility, a trial of esophageal dilation may be considered. However, a crossover study of patients with nutcracker esophagus demonstrated neither symptomatic nor significant manometric improvement following 54-french therapeutic bougie dilation compared with a sham (24-french) dilation [48]. Benefit was reported following 30-mm (sometimes followed by 35 mm) pneumatic dilation in 14/20 patients with DES; however an esophageal perforation also occurred [49]. Therefore while a therapeutic trial of dilation may be reasonable, particularly if an esophageal outflow obstruction is suspected, a small, but real, risk of perforation needs to be considered prior to advancing to pneumatic dilation.
Botulinum toxin injection , which exhibits its inhibitory neuromuscular effect via cholinergic blockade, is also a therapeutic option. Injection of botulinum toxin into the LES or LES and distal esophageal wall demonstrated symptomatic improvement in open-label use among patients with DES [50, 51]. Further, a sham-controlled, crossover study of botulinum toxin injection (into the LES and distal esophageal wall) in patients with DES or nutcracker esophagus demonstrated a symptomatic improvement, but not significant manometric improvement, following botulinum toxin injection [52]. A recent retrospective study of HRM-defined DES and jackhammer patients also reported a symptomatic response in most (5/7 jackhammer and 4/6 DES) patients at ≥6 months; however, a patient death due to botulinum toxin injection-related mediastinitis was reported [53]. Further multicentered, retrospective study of the safety of esophageal botulinum toxin injection found mild complications in 16% of 141 botulinum toxin injections among patients with nonachalasia spastic motility disorders; chest pain was the most common [54]. The death following mediastinitis, which was also included in this study, was the only major complication among 657 total botulinum toxin injections for all esophageal motility disorders [54]. Therefore, botulinum injection appears to be another reasonable endoscopic treatment option for spastic motility disorders.
Surgical Therapy
Surgical esophageal myotomy remains a therapeutic option for symptoms that are refractory to medical or endoscopic (i.e., less invasive) therapies. Symptomatic benefit following an extended esophageal myotomy via thoracoscopic or laparoscopic approach in patients with DES and nutcracker esophagus has been described in numerous uncontrolled reports [55,56,57].
Recently per-oral endoscopic myotomy (POEM) , an application of natural-orifice surgery initially utilized for therapy in achalasia, appears to provide a promising therapeutic option for spastic esophageal motility disorders [58, 59]. Endoscopic creation of a submucosal tunnel in the esophageal wall allows minimally invasive access to perform a myotomy at the LES that can also be extended proximally along the esophageal body. An international multicenter report of POEM in patients with HRM-defined DES and jackhammer esophagus that were refractory to medical therapy demonstrated symptomatic improvement in 9/9 DES patients and 7/10 jackhammer patients [60]. Thus while greater experience remains needed with POEM for nonachalasia spastic motility disorders, it represents a promising therapeutic option for patients that are refractory to other therapies.
Patient question: What will happen to me in the long run? What type of follow-up and monitoring do I need?
Suggested response to the patient:
Although the course of esophageal spasm is generally not well understood, it likely carries a stable but overall benign course. Hypothetically, there may be a small chance of progression to another esophageal motility disorder (achalasia). Therefore, the primary aim of long-term follow-up will be to ensure that symptoms are adequately managed, though repeating diagnostic testing (endoscopy, manometry, barium esophagram) every several years may be considered.
The Natural History of Spastic Esophageal Motility Disorders
The natural history of spastic motility disorders is generally not well understood. Based on the potentially shared pathologic mechanism with achalasia (impaired inhibitory innervation), a continuum of esophageal disease resulting in progression from spastic motility disorders to achalasia has been suggested. A study that repeated conventional manometry at a mean +/−SD 4.8+/−3.4 years after a diagnosis of DES reported achalasia in 8% (1/12 patients) [61]. Another study that repeat conventional manometry at 1–4 years (mean 2.1) following an initial diagnosis of DES reported “progression” to achalasia in 14% (5/35 patients) [62]. In these two studies, 58% (7/12) and 74% (26/35) of patients maintained a diagnosis of DES, while 25% (3/12) and 11% (4/35) had normal manometry, at follow-up manometry [61, 62]. There are only case reports of nutcracker esophagus “progressing” to both DES and achalasia [63,64,65]. However, the possibility that instead of rare progression these studies report initially missed diagnoses of achalasia that was detected on repeat manometric testing (e.g., Fig. 2.2) needs to be considered.
Evidence of progression of HRM-defined spastic motility disorders (DES and jackhammer) remains primarily limited to case reports. Additionally, while only presented to date in abstract form, one retrospective study of patients that previously completed multiple HRMs reported type III achalasia in 1/8 patients with j ackhammer esophagus on initial HRM 14 months earlier [66].
Ultimately, the risk of progression from DES, nutcracker, or jackhammer esophagus to achalasia appears to be low. However, so does normalization of manometric findings. Therefore, surveillance should primarily focus on symptom control and necessary therapeutic adjustments. However, due to the potential for spastic motility features representing a reactive motility finding (particularly to reflux or esophageal obstruction), repeat diagnostic testing with endoscopy, barium radiography, as well as manometry may be considered intermittently (i.e., every 3–5 years) or as directed by therapeutic ineffectiveness in symptomatic management.
Conclusions
Spastic esophageal motility disorders, DES, nutcracker, and jackhammer esophagus are rare esophageal motility disorders associated with esophageal chest pain and dysphagia. Manometric criteria (previously simultaneous, now premature contractions for DES; high-amplitude contractions for nutcracker; hypercontractile contractions for jackhammer) form the basis for diagnosis. However diagnostic challenges arise as the associated motility findings may reflect a secondary reaction to reflux or esophageal obstruction and further intermittent symptoms and motility patterns may not occur during the timeframe of the standard stationary manometry. Therefore, a comprehensive diagnostic approach is often required to accurately define the esophageal disease process(es) contributing to symptoms. While disease-targeted therapy is ideal, therapeutic management often requires a sequential series of therapeutic trials to optimally achieve symptom relief, typically beginning with least invasive (pharmacologic) to more invasive (endoscopic then surgical) options. Hopefully, advances in esophageal diagnostics, beginning with increased application of HRM, will continue to enhance our understanding of spastic esophageal motility disorders and help improve future management paradigms.
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Acknowledgements
Disclosures:
Dustin Carlson: Nothing to disclose.
John E. Pandolfino: Given Imaging (Consultant, Grant, Speaking), Sandhill Scientific (Consulting, Speaking), Takeda (Speaking), Astra Zeneca (Speaking).
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Carlson, D.A., Pandolfino, J.E. (2018). Esophageal Chest Pain: Esophageal Spasm. In: Bardan, E., Shaker, R. (eds) Gastrointestinal Motility Disorders . Springer, Cham. https://doi.org/10.1007/978-3-319-59352-4_2
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