[Body surface isopotential T map and ventricular volume characteristics in secundum atrial septal defect].
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: the T map resembling normal (type A, n = 9); that with isolated negative area in positive area (type B, n = 11); and that with rightward movement of maximum (type C, n = 5). Right ventricular end-diastolic volumes in type B (161 +/- 19% of normal; %N) and C (175 +/- 40% N) were significantly (p < 0.01) greater than those in control (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 control (30 +/- 5 mmHg), type A (31 +/- 4 mmHg) and type B (34 +/- 5 mmHg). These results suggest that the cases with type B have right ventricular volume overload, and those with type C have both volume and pressure overloads.
Nakasato
M
M
Department of Pediatrics, Yamagata University School of Medicine.
Sato
S
S
Akiba
T
T
D018780:Body Surface Potential Mapping / Q000379:methods*; D002648:Child; D002675:Child, Preschool; D005260:Female; D006344:Heart Septal Defects, Atrial / Q000175:diagnosis* / Q000503:physiopathology; D006801:Humans; D008297:Male; D013318:Stroke Volume; D016278:Ventricular Function, Right; D017725:Ventricular Pressure