title: The influence of exercise on atrial flutter.
abstract: To study the effect of exercise on atrial flutter the electrocardiogram was recorded continuously before, during and after low level treadmill walking in twenty-two ambulatory patients. Atrial flutter rates increased during exercise testing in four patients. Improved A-V conduction with consequent higher ventricular rates occurred during exercise in thirteen subjects. One patient, with 4:1 conduction at rest, continued with 4:1 block throughout exercise testing, was believed to be over-digitalized. During the recovery period after exercise, ten patients transiently developed periods of Wenckebach A-V block. Walking exercise induced 1:1 conduction in six patients and was promoted by the following circumstances: 1) atrial rates of 250/min or less; 2) inadequate dosage of digitalis; and 3) the administration of quinidine. For the patient with chronic atrial flutter, treadmill testing provides a simple method for demonstrating the range of changes of A-V conduction and for deriving implications for appropriate drug therapy.
mesh_terms: D000328:Adult; D000368:Aged; D001282:Atrial Flutter / Q000188:drug therapy / Q000503:physiopathology*; D004070:Digitalis / Q000627:therapeutic use; D005080:Exercise Test; D005260:Female; D006329:Heart Conduction System / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D008517:Phytotherapy; D010946:Plants, Medicinal; D010947:Plants, Toxic; D011433:Propranolol / Q000627:therapeutic use; D011802:Quinidine / Q000627:therapeutic use
chemical_list: D011433:Propranolol; D011802:Quinidine