Figure 1From: The oesophagus and cough: laryngo-pharyngeal reflux, microaspiration and vagal reflexesNumbers of reflux events in a 24 hr period in an unselected group of patients with chronic cough (CC n = 78) and healthy volunteers (HV n = 20). Total numbers of events are show and the number of acid events (pH < 4), number of non-acid events (pH > 4), and the number of events extending into the proximal oesophagus i.e. 16-18 cm above the lower oesophageal sphincter. Data from [19].Back to article page