title: Chronotropic changes due to pericardial distension in isolated frog hearts perfused in situ.
mesh_terms: D000818:Animals; D001001:Anura; D002305:Cardiac Tamponade / Q000503:physiopathology*; D004562:Electrocardiography; D006329:Heart Conduction System / Q000503:physiopathology*; D006339:Heart Rate; D010490:Pericardial Effusion / Q000503:physiopathology*; D012849:Sinoatrial Node / Q000503:physiopathology