title: Variability of thoracic impedance cardiograms in man.
mesh_terms: D000293:Adolescent; D000328:Adult; D001049:Apnea / Q000503:physiopathology; D002302:Cardiac Output; D002307:Cardiography, Impedance; D006801:Humans; D008297:Male; D008875:Middle Aged; D010992:Plethysmography, Impedance; D012119:Respiration