Figure 1From: Erythromycin lacks colon prokinetic effect in children with functional gastrointestinal disorders: a retrospective study HAPCs in a patient with chronic constipation. High amplitude propagating contractions (HAPCs) following bisacodyl stimulation in a 10 year old boy with chronic constipation. The colon contractions are propagating from the cecum to the sigmoid colon.Back to article page