title: Sinus rhythm complicated by second-degree sino-atrial block.
mesh_terms: D000328:Adult; D001146:Arrhythmia, Sinus / Q000150:complications*; D004562:Electrocardiography; D005260:Female; D006327:Heart Block / Q000150:complications*; D006333:Heart Failure / Q000150:complications*; D006801:Humans; D011247:Pregnancy; D011249:Pregnancy Complications, Cardiovascular; D012848:Sinoatrial Block / Q000150:complications*