Figure 4From: Assessment of esophageal involvement in systemic sclerosis and morphea (localized scleroderma) by clinical, endoscopic, manometric and pH metric features: a prospective comparative hospital based study24-hour pH monitoring. This is the pH tracing of a systemic sclerosis patient who underwent ambulatory 24-hour pH monitoring. It shows the drop in the pH below 4 and persisting for a longer time (abnormal reflux).Back to article page