title: Body surface isopotential T map for assessment of right ventricular volume and pressure overloads in secundum atrial septal defect.
abstract: The body surface isopotential T map was analyzed to detect right ventricular volume and pressure overloads in 25 patients with secundum atrial septal defect. Three patterns were distinguished: a T map resembling normal (type A, n = 9); that with an isolated negative area in a positive area (type B, n = 11); and that with rightward movement of maximum (type C, n = 5). Right ventricular end-diastolic volumes in types B (161 +/- 19% of normal; %N) and C (175 +/- 40% N) were significantly (p < 0.01) greater than those in controls (100 +/- 9% N) and type A (113 +/- 18% N). Right ventricular systolic pressure in type C (48 +/- 11 mmHg) was significantly (p < 0.01) higher than those in the controls (30 +/- 5 mmHg), type A (31 +/- 4 mmHg), or type B (34 +/- 5 mmHg). These results suggest that the patients with type B have right ventricular volume overload and those with type C have both volume and pressure overloads.
authors.affiliation: Department of Pediatrics, Yamagata University School of Medicine, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Nakasato
authors.forename: T
authors.initials: T
authors.lastname: Akiba
authors.forename: S
authors.initials: S
authors.lastname: Sato
authors.forename: K
authors.initials: K
authors.lastname: Hayasaka
mesh_terms: D018780:Body Surface Potential Mapping; D002648:Child; D002675:Child, Preschool; D005260:Female; D006344:Heart Septal Defects, Atrial / Q000503:physiopathology*; D006439:Hemodynamics; D006801:Humans; D008297:Male; D013318:Stroke Volume; D018497:Ventricular Dysfunction, Right / Q000175:diagnosis*