J Neurogastroenterol Motil 2013; 19(3): 390-394  https://doi.org/10.5056/jnm.2013.19.3.390
Lung Transplantation Triggered "Jackhammer Esophagus": A Case Report and Review of Literature
Mohammed Q Khan1*, Imran Y Nizami2, Basha J Khan2 and Hamad I Al-Ashgar1

1Section of Gastroenterology, Department of Medicine, King Faisal Specialist Hospital & Research Center, Riyadh, Saudi Arabia.

2Section of Lung Transplant, Organ Transplant Center, King Faisal Specialist Hospital & Research Center, Riyadh, Saudi Arabia.

Correspondence to: Correspondence: Mohammed Q Khan, MRCP (UK). Section of Gastroenterology, Department of Medicine, King Faisal Specialist Hospital & Research Center, P.O.Box 3354, Riyadh 11211, Saudi Arabia. Tel: +966-1-442-4729, Fax: +966-1-442-7499, mohamedkhan@kfshrc.edu.sa
Received: March 5, 2013; Revised: March 29, 2013; Accepted: April 7, 2013; Published online: July 8, 2013.
© The Korean Society of Neurogastroenterology and Motility. All rights reserved.

cc This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Keywords: High-resolution manometry, Jackhammer esophagus, Lung transplantation
Introduction

Jackhammer esophagus (spastic nutcracker) is a newly described entity identified on high-resolution manometry (HRM) and defined as a distal contractile integral (DCI) of greater than 8,000 mmHg · cm · sec on single or multiple swallows in the presence of normal lower esophageal sphincter (LES) relaxation; this DCI value was not encountered in control subjects.1 As hypertensive peristalsis presents a substantial heterogeneity, it is subsequently divided into "nutcracker esophagus" with the mean DCI is within the 5,000-8,000 mmHg · cm · sec range and into "spastic nutcracker" with the mean DCI of > 8,000 mmHg · cm · sec.2 Because the repetitive, high-amplitude contractions evoke the action of a Jackhammer, Roman and Tutuian et al2 coined the descriptive term "Jackhammer esophagus" (rather than spastic nutcracker) to fit better with the contractile morphology and to avoid confusion with spasm that occurs in a context of reduced distal latency. This phenomenon, branded "Jackhammer esophagus" was never encountered in control subjects and usually accompanied by dysphagia or chest pain, occuring either in association with esophageal pathology or as an isolated motility disturbance.3 A primary or secondary neuromuscular disorder was suspected in the past. In fact, its physiopathology remains unclear and different hypotheses have been suggested. The clinical presentation is diverse; some Jackhammer esophagus cases are clearly associated with mechanical esophagogastric junction outflow obstruction, others secondary to reflux disease, and some are attributable to primary esophageal muscle hypercontractility. Some reports have focused on the high prevalence of esophageal dysmotility and delayed gastric emptying after lung transplantation (LTx) with inadvertent partial or total surgical vagotomy as the suspected mechanism of postoperative gastroesophageal reflux disease (GERD).4 However, these disorders might be secondary to a reactive process like GERD. We report a case of severe esophageal spastic hypercontractility (Jackhammer esophagus), the symptoms of which developed 4 weeks after the transplant, a repeat manometry 8 weeks after bilateral sequential LTx confirmed the diagnosis. This hypercontractility resolved 4 week later. The etiopathogenesis of this transient esophageal dysmotility in relation to postsurgical trauma and other pathophysiological changes developing after the surgical trauma of LTx will be discussed and reviewed.

Case Report

Nineteen-year-old female was diagnosed as idiopathic bilateral bronchiectasis and developed end stage lung disease and respiratory failure. She was referred to King Faisal Specialist Hospital & Research Center in June 2012 for further assessment and possible LTx. During her routine pre-transplant work up, esophageal HRM 24-hour pH impedance monitoring and modified barium swallow were performed to rule out any major esophageal dysmotility or significant GERD, which could predispose her to recurrent aspiration pneumonia and pseudomonas colonization. There was no significant past history of heartburn, regurgitation, chest pain or dysphagia before the LTx. HRM study was performed with a 4.2 mm outer diameter solid state assembly with 36 circumferential sensors spaced at 1-cm intervals (Given Imaging, Los Angeles, CA, USA). Esophageal pressure topography data was analyzed using ManoView™ analysis software. Her pre-transplant, HRM parameters were within normal limits (Table 1). Ambulatory impedance pH monitoring study was performed before the LTx, after an overnight fast (off proton pump inhibitors [PPI] for 1 week) on an out-patient basis, using a ZepHr system (Sandhill Scientific, Inc., Highland Ranch, CO, USA), which was equipped with a catheter with 6 impedance electrodes and 2 pH electrodes (first at distal esophagus and second at just below the upper esophageal sphincter). Both the impedance and pH signals were recorded at 50 Hz on a 128 MB compact flash (SanDisk, Milpitas, CA, USA). No significant gastro-esophageal reflux was reported in pre-transplant 24-hour impedance pH evaluation (Table 2).

She underwent bilateral sequential LTx in October-2012 with no major post-operative complication and discharged after 2 weeks in stable condition on immunosuppressant drugs (mycophenolate mofetil, tacrolimus and prednisolone). She was re-admitted 4 weeks later, when she developed aspiration pneumonia with additional complaints of dysphagia, regurgitation and heartburn. Her second hospital course was again uneventful; she received parenteral antibiotics, PPI and discharged in satisfactory condition. It was suspected that her aspiration pneumonia might have been triggered by GERD secondary to esophageal dysmotility. She was advised to continue her immunosuppressant and standard chemoprophylaxis with valganciclovir, bactrim and itraconazole, in addition to esomeprazole 20 mg twice daily to suppress the symptoms of GERD. Azithromycin 3 times weekly was added as anti-inflammatory agent. The patient's HRM study was repeated 8 weeks after LTx, and her detail HRM datasets were reviewed according to the current Chicago classification. It showed typical spastic hypercontractile contractions (the greatest DCI = 12,437 mmHg · cm · sec) consistent with the diagnosis of Jackhammer esophagus. Surprisingly, her last esophageal HRM returned to normal at 12 weeks after LTx, as shown in the study of esophageal pressure topography with conventional line tracings (Figure) without use of any muscle relaxant or sedatives. The data included in the HRM study was LES resting pressure, distal latency, integrated residual pressure, DCI and distal esophageal amplitude at 3, 7 and 11 cm above LES and contractile front velocity before LTx, 4 and 12 weeks after LTx as shown in Table 1.

The 24-hour pH impedance monitoring study was repeated again on PPI after 8 weeks of LTx (because she was symptomatic on PPI) which was consistent with significant GERD. Gastric emptying study also after the LTx showed severely delayed gastric emptying for solid meal (97% retention at 120 minutes with stagnation of food at 4 hours delayed images) consistent with gastroparesis. Post LTx barium swallow and upper gastrointestinal endoscopy was normal. The impedance pH study (on PPI) was repeated 12 weeks after LTx and surprisingly, no significant abnormality was seen (Table 2).

Discussion

To date, there is no available data regarding the impact of bilateral sequential LTx on esophageal hypercontractility. Jackhammer esophagus is recently described term used for hypercontractile esophagus with at least a single contraction with DCI of > 8,000 mmHg · cm · sec. In fact, the pathophysiology of Jackhammer esophagus remains unclear but different hypotheses have been suggested. Hypertensive contractions have been noticed in the presence of mechanical obstruction induced by fundoplication or laparoscopic gastric band.5 Vigorous esophageal contractions may be related to excessive excitation or myocyte hypertrophy, their hypothesis is that an increase in esophageal muscle thickness/muscle cross-sectional area is a marker of outflow obstruction of the esophagus.6 These two suggested mechanisms are not pertinent in our case, as there was no previous history of distal esophageal ulceration or stricture secondary to GERD or esophageal injury during LTx leading to postsurgical scarring, adhesion and mechanical obstruction. Anderson et al7 documented a statistically significant increase in esophageal contraction amplitudes in both healthy volunteers and in patients with non-cardiac chest pain while being exposed to acute stress.7 In our case, it may be possible that after LTx, she developed pneumonia that required hospitalization; where stress might play a role in the pathogenesis of transient hypercontractility that recovered after discharge.

Our patient developed post LTx aspiration pneumonia probably secondary to GERD, as documented and supported by positive 24-pH impedance monitoring. GERD is associated with chest pain and hypertensive esophageal contractions.8 The prevalence of GERD is observed to be higher after LTx. Young et al9 reported the incidence of GERD in 65% patients after LTx, however, others10 stated around 70%. There are multiple reasons to have higher prevalence of GERD after LTx. Davis et al11 concluded that GERD is highly prevalent after LTx and reported that 36% of GERD patients had ineffective esophageal motility as compared with 6% of patients without GERD. It is not clear whether GERD triggered the hypercontractility or vice versa but in our case GERD and esophageal hypercontractility, both responded to PPI.

High prevalence of esophageal dysmotility observed prior to LTx might continue after the LTx. Basseri et al12 reported both hypotensive and aperistaltic swallows were 6-fold more prevalent in LTx candidates than in control subjects, while their control subjects had normal HRM, LTx candidates had 76.7% of esophageal peristaltic dysfunction. Pre-transplant evaluation in the present case included normal HRM and 24-hour impedance pH monitoring, so preexisting dysmotility is unlikely the cause of post LTx hypercontractility. The previous literature mainly described esophageal hypomotility disorders developed after LTx, but not hypercontractility (Jackhammer esophagus).

The present case developed gastroparesis after the LTx. Studies have shown that gastroparesis is common in LTx recipients; complicated by GERD with recurrent aspiration and associated with the development of bronchiolitis obliterans syndrome. Raviv et al13 documented delayed gastric emptying in 50% of patients before LTx, 74% after 3 months of LTx and 63% at 12 months. In addition, they also demonstrated that 50% of patients with delayed gastric emptying demonstrated an abnormally low esophageal tone and about 27% with delayed gastric emptying had an abnormal DeMeester score. In another report,14 delayed gastric emptying occurred in 67% of their LTx candidates with cystic fibrosis, with the prevalence increasing to 97% about 6 weeks after LTx. Dougenis et al15 conducted a prospective study, where they performed esophageal manometry before and after pneumonectomy and concluded that motility disorders were most evident following major lung resection like pneumonectomy. After LTx, disturbance of the autonomic nervous systems is one of the major reasons to lead to esophageal dysmotility and delayed gastric emptying. Our patient reported to have significant gastroparesis, which diverted our attention towards vagal nerve injury. Anatomic considerations suggest that the vagi are most likely to be injured at or near the lung hila. At the lung root, each nerve gives branches to the pulmonary plexuses and then divides into 2 or more branches that pass infero-medially to unite with the corresponding branches of the opposite vagus to form a plexus surrounding and supplying the esophagus.16 Sifrim et al17 have suggested that the mechanism of the increase in contraction amplitude might be due to an imbalance between excitatory and inhibitory innervation, and that patients with spastic disorders of the esophagus have an impaired inhibitory innervation whether this abnormality is secondary to the vagal nerves denervation, local ischemia, scarring of the esophagus and mediastinum after surgery. Lung transplantation involves vagal nerve transection resulting in sensory and autonomic denervation of the airways and gastroesophageal dysfunction; whether this transient esophageal dysmotility in our case was the effect of limited intra-operative damage to vagus nerve branches or its plexus, patient regained her function after recovery. We overlooked to perform the gastric emptying study before the LTx, therefore whether gastroparesis developed due to intraoperative vagus nerve injury or it was present before the LTx is debatable.

Regarding medications as a cause of Jackhammer esophagus, Mertens et al18 reported that LTx patients "on" azithromycin had less gastroesophageal reflux and bile acids aspiration. They found a reduction in the total number of reflux events (acid and non-acid) induced by azithromycin and hypothesized that the anti-reflux effect was due to its prokinetic properties that enhanced esophageal motility and accelerated gastric emptying. Our patient received azithromycin as a prophylactic dose (250 mg 3 times a week) after LTx, which is unlikely to augment esophageal hypercontractility. There are no reports in literature where mycophenolate mofetil, tacrolimus or valganciclovir claimed to have any major side effect on esophageal motility. Immune-suppressant drugs induced dysmotility is unlikely as the patient continued the treatment but in contrast, hypercontractility returned to normal. In immunocompromised patients, reactivations of esophageal viral and fungal infections have been reported in the past. Recently, varicella zoster vagal neuropathy induced by this neurotropic virus was reported by Paliwal et al19 which caused esophageal hypomotility and gastroperesis. All our post LTx patients' including this patient were maintained on prophylaxis with valganciclovir and was monitored for reactivation of cytomegalovirus by serial cytomegalovirus antigenemia tests. In addition, no esophageal mucosal abnormality was seen during endoscopy and her varicella zoster, herpes simplex, Epstein-Barr virus IgM antibody and early Epstein-Barr virus antigenemia tests remained negative.

In summary, the pre-transplant evaluation of this case did not show any esophageal motility abnormality, the transient "Jackhammer esophagus" developed after the bilateral sequential LTx and recovered without any specific treatment except PPI for symptomatic GERD. The pathophysiology of this rare esophageal spastic nutcracker remained obscure, but the possible etiopathogenesis include hypercontractility precipitated by GERD, started by neurotropic viral infection, initiated by stress induced surgical trauma, induced by outflow obstruction in and around LES, exaggerated by prokinetic and immunosuppressive drugs or complicated by partial vagotomy during LTx that lead to esophageal dysmotility and gastroparesis. In our case, the most likely triggering factor to develop Jackhammer esophagus was GERD, which was precipitated by LTx related vagal nerve injury and relieved by PPI.

Figures
Fig. 1. Esophageal high-resolution manometry showed conventional line tracing and esophageal pressure topography before lung transplantation (LTx), then 4 and 12 weeks after LTx. HRM, high-resolution manometry.

Tables
Table. 1. High-resolution Esophageal Manometry Data Before and After Lung Transplantation

HRM, high-resolution manometry; LTx, lung transplantation; LES, lower esophageal sphincter; DEA, distal esophageal amplitude.

Table. 2. Twenty-four Hour pH Impedance Monitoring Data Before and After Lung Transplantation

HRM, high-resolution manometry; LTx, lung transplantation; LES, lower esophageal sphincter; DEA, distal esophageal amplitude.

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