Mary Anne Cooper, MSc, MD, FRCPC, Assistant Professor, Department of Medicine, University of Toronto; Lecturer, Sunnybrook and Women's Health Sciences Centre, Toronto, ON.

Gastroesophageal reflux disease is a common condition responsible for significant morbidity in older adults. It causes disease in the esophagus, and it is increasingly recognized as a cause of extra-esophageal symptoms such as chronic cough, adult-onset asthma, and hoarseness. Despite significant symptoms, endoscopy may be negative. Endoscopy-negative reflux disease may be a unique disease entity within the acid reflux group of disorders that includes erosive esophagitis and Barrett’s esophagus. Regardless of the symptoms or endoscopic findings, treatment remains geared to reducing the contact time between acid and sensitive tissue through lifestyle modification measures, acid suppression, and improved upper gastrointestinal motility.

Key words: GERD, extra-esophageal reflux, endoscopy-negative reflux disease, acid suppression, older adults.

Mary Anne Cooper MSc, MD, FRCPC, Department of Medicine, University of Toronto; Lecturer, Sunnybrook and Women’s Health Sciences Centre, Toronto, ON.

Introduction
Gastroesophageal reflux disease (GERD), the abnormal reflux of gastric and duodenal contents into the esophagus, is common. Almost 50% of the North American population experience symptoms once a month and 10% have symptoms daily.¹ Patients most commonly complain of pyrosis and regurgitation, but other symptoms such as dysphagia, chest pain and nausea are not rare.¹ As well, respiratory tract symptoms such as cough, hoarseness and asthma may be attributable to GERD (Table 1).^1,2

Acid reflux into the esophagus is a normal physiologic event. It occurs after meals when the lower esophageal sphincter (LES) tone is reduced. The LES opens, creating a common cavity with the stomach. Because stomach pressures are higher than esophageal pressures, gastric contents reflux into the esophagus. Formal measurement with 24-hour pH monitoring indicates that the pH of the esophagus should be < 4 for < 4% of the time. Factors that increase acid contact time with the esophagus promote GERD.

Alexandra Nevin, BSc

Gastroesophageal Reflux Disease (GERD) is the pathological manifestation of a normal physiological process, and is associated with a range of clinical symptoms and complications of varying severity. In normal individuals, gastric acid reflux into the esophagus occurs without any accompanying signs or symptoms of mucosal damage. The majority of these events are the result of transient lower esophageal sphincter relaxation (TLESR).^1,2 Normally, TLESR is not accompanied by inadequate innate esophageal protective mechanisms which characterize the development of GERD. The wide spectrum of presenting symptoms makes definitive and accurate diagnosis and management of GERD a clinical challenge. This is especially true for physicians who treat the elderly and have to contend with the increased absolute incidence of GERD, the number of concurrent medical conditions, changing physiology of the aging esophagus, and the prevalence of atypical symptoms and complications.

The incidence and natural history of GERD
In the United States, 44% of the adult population surveyed reported experiencing heart burn, the most frequently noted symptom of GERD sufferers, at least once every month.^3,4 The absolute incidence of GERD has been shown to increase with age, with an initial dramatic rise in incidence after 40 years of age, and significant increases at age 60 and then again at age 70.