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Laryngopharyngeal Reflux Disease (LPRD) – Review Article Laryngopharyngeal reflux disease (LPRD) – Review article Author: Abstract Toshimi Chiba, M.D., Ph.D. Laryngopharyngeal reflux disease (LPRD) is Division of Internal Medicine, caused by the back-flow of stomach contents Department of Oral Medicine, Iwate and/or gastric acid into the laryngopharynx. Symptoms of laryngopharyngeal reflux (LPR) Medical University, Morioka, Iwate, include hoarseness, sore throat, throat-clearing, 020-8505, Japan chronic cough, globus sensation, dysphagia, and Correspondence to: postnasal drip. LPRD is diagnosed in Toshimi Chiba, M.D., Ph.D. approximately 10% of patients presenting to outpatient otolaryngology clinics and in more than Division of Internal Medicine, 50% of patients presenting with voice complaints. Department of Oral Medicine Gastroesophageal reflux disease (GERD) and Iwate Medical University LPRD may be associated with periodontitis, sleep 19-1 Uchimaru disorders, and otolaryngology disease. Gastric acid Morioka, Iwate, 020-8505 reflux with LPRD is thought to cause laryngeal Japan granulomas. The most useful endolaryngeal signs Phone: +81-19-651-5111 for diagnosing LPRD are erythema, edema, and Fax: +81-19-654-3281 interarytenoid hypertrophy. Ambulatory 24-h dual- Email: [email protected] probe pH monitoring can be misleading; false- Key words: LPRD, GERD, acid- positive outcomes may occur due to artifacts in the related disease, 24-h esophageal pH upper probe, and false-negative outcomes can monitoring, periodontitis, sleep occur as a result of the intermittent character of disorder, otolaryngology disease, reflux episodes. In patients with LPRD, proton treatment, PPI, PCAB pump inhibitors (PPIs) have been shown to significantly improve reflux laryngitis. However, some patients are resistant to antacid therapy. Nocturnal acid breakthrough (NAB) on PPI has been suggested as one reason for resistance to PPI therapy. Administration of a PPI with the additional bedtime administration of a histamine-2 receptor antagonist has been shown to be an effective treatment of LPRD with NAB. Recently, potassium-competitive acid blockers have been proposed as an effective treatment of antacid- resistant disease. Medical Research Archives, Vol. 5, Issue 2, February 2017 Laryngopharyngeal reflux disease (LPRD) – Review article 1. Introduction warning sign of cancer (7). Hence, the effect of PPI therapy on HRQOL is an Gastroesophageal reflux (GER), important component of treatment (5). defined as the entry of gastric contents into the esophagus, is a common disorder In this article, we review the encountered in clinical practice and is definition, epidemiology, usually treated with proton pump pathophysiology, symptoms, examination, inhibitors (PPIs). Laryngopharyngeal diagnosis, and treatment of LPRD. reflux disease (LPRD) is similarly 2. Definition common, particularly in patients with vocal disorders (1). Several studies have Gastroesophageal reflux disease reported that PPI treatment of LPRD can (GERD) is a common disorder improve ear, nose, and throat (ENT) characterized by acid regurgitation and symptoms, although symptom heartburn. Gastric reflux can affect organs improvement usually requires higher other than the esophagus; subsets of doses of PPIs and a longer treatment time gastric reflux include atypical reflux, than for typical reflux symptoms (2,3,4,5). extraesophageal reflux, reflux laryngitis, and LPR. LPRD is caused by the back- The current management of LPRD flow of stomach contents and/or gastric includes life style changes, Histamine-2 acid into the laryngopharynx (8). receptor antagonist (H2RA) therapy, PPI Common presenting symptoms of LPR therapy, or a combination of H2RA and include hoarseness, sore throat, throat- PPI therapies, with treatment duration of clearing, chronic cough, globus sensation, 1-6 months (6). dysphagia, and postnasal drip (3,9). The LPRD has a significant impact on effects of gastric reflux on the larynx health-related quality of life (HRQOL). In include direct exposure to gastric addition to suffering from heartburn and contents, a vagal-mediated reflex, a abdominal pain, patients may worry that these symptoms represent an early Copyright 2017 KEI Journals. All Rights Reserved Page │2 Medical Research Archives, Vol. 5, Issue 2, February 2017 Laryngopharyngeal reflux disease (LPRD) – Review article secondary increase in throat-clearing, and LPRD should be suspected when increased laryngeal muscle tone (10). laryngeal edema or erythema is observed in a patient with classic LPRD symptoms. 3. Epidemiology It has been estimated that 15 to 20% 4. Pathophysiology of patients presenting to an In LPRD, gastric acid reflux is otolaryngologist complain of chronic thought to cause laryngeal granuloma cough, globus sensation, dysphonia, or formation (16) (Figure 1-a). Mechanical sore throat (11). LPRD is diagnosed in stimulation, such as vocal cord abuse, approximately 10% of patients presenting endotracheal intubation, and coughing, to outpatient otolaryngology clinics, and may also contribute to granuloma in more than 50% of patients presenting formation (17). LPRD patients have with voice complaints (12). Fewer than significantly longer acid reflux time in the 40% of LPRD patients report typical upper esophagus than do control patients. symptoms of GERD, such as heartburn An upper esophageal pH of 5 is an (3,13,14). In contrast, 44% of the adult appropriate cutoff for the diagnosis of US population report GERD symptoms at LPRD (18). Nocturnal acid breakthrough least once a month, 20% report at least (NAB) also appears to contribute to once a week, and 7% report daily LPRD pathophysiology, and may be one symptoms (15). Although there is of the causes of LPRD resistance to PPI significant overlap between LPRD therapy (19). symptoms and other disease processes, Copyright 2017 KEI Journals. All Rights Reserved Page │3 Medical Research Archives, Vol. 5, Issue 2, February 2017 Laryngopharyngeal reflux disease (LPRD) – Review article Figure 1-a. Endoscopic view of vocal fold granuloma. Granuloma visualized with White Light Endoscopy (WLE) 5. Examination term outcome of medical therapy in Ambulatory 24-h dual-probe pH LPRD (3). The endolaryngeal signs considered most useful in diagnosing monitoring is considered the gold standard for LPR diagnosis. However, this LPRD include erythema, edema, and method can be misleading; false-positive interarytenoid hypertrophy (6,22). An outcomes can occur due to artifacts in the accurate clinical assessment of upper probe, and false-negative outcomes endoscopic laryngeal findings can be can occur as a result of the intermittent difficult (23), but a combination of white light endoscopy (WLE) and Narrow Band character of reflux episodes (20, 21). Imaging (NBI) may enable easier Endoscopic findings and detection of benign vocal fold lesions (24) quantification of esophageal acid (Figure 1-b). exposure may help to predict the long- Copyright 2017 KEI Journals. All Rights Reserved Page │4 Medical Research Archives, Vol. 5, Issue 2, February 2017 Laryngopharyngeal reflux disease (LPRD) – Review article Figure 1-b: Endoscopic view of vocal fold granuloma. Granuloma visualized with Narrow Band Imaging (NBI) standard” for diagnosing reflux 6. Symptoms and Diagnosis (26,27,28), is less sensitive for diagnosing The diagnosis of LPRD is based on extraesophageal manifestations of reflux, a combination of the patient‟s history, such as GERD-related laryngitis. pH symptoms, and laryngeal signs observed monitoring of the distal esophagus, the during laryngoscopy. The more signs and proximal esophagus, and the hypopharynx symptoms a patient has, in the absence of was only 70%, 50%, and 40% sensitive, other potential causes, the more likely the respectively, for detecting reflux (29,30). diagnosis of LPRD. As such, LPRD can Emerging data suggest that pH monitoring be considered a “diagnosis of exclusion”. has a poor sensitivity for establishing A positive response to a 4-month trial of cause and effect associations between 40mg PPI twice-daily confirms the reflux and laryngeal signs. For example, diagnosis of LPRD. However, non- abnormal pH findings do not predict response does not exclude LPRD (6, 25). responses to therapy (31,32), and patients Ambulatory 24-h esophageal pH with or without proximal or monitoring, once considered the “gold hypopharyngeal acid reflux report Copyright 2017 KEI Journals. All Rights Reserved Page │5 Medical Research Archives, Vol. 5, Issue 2, February 2017 Laryngopharyngeal reflux disease (LPRD) – Review article improvement in laryngeal symptoms other established risk factors such as following medical treatment. Despite this, dental caries, tobacco use, or a history of many gastroenterologists report that pH calcium channel blocker, cyclosporine, or monitoring remains among the most phenytoin use (35). Significant useful tests for evaluating patients with associations between GERD, tooth loss, GERD-related laryngitis. and functional dyspepsia (FD) have been Many symptoms have been observed in women, but not in men. associaтед with LPRD, including Furthermore, a significant relationship abnormal voice characteristics such as exists between tooth loss and components musculoskeletal tension, hard glottal of FD, such as early satiety (36). attack, glottal fry, restricted tone However, the association between placement, and hoarseness (33). periodontitis and LPRD remains unclear. Digital laryngeal videostroboscopy 7.2. Sleep disorders (LVS) has revealed that PPI therapy Previous research has demonstrated improves
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