Ultrasonocardiotomography and echocardiography were utilized to examine the interatrial septum in 42 subjects, including 21 with atrial septal defects, though specific results were not reported.
Observational (n=42)
Can ultrasonocardiotomography and echocardiography detect ostium secundum defects of the interatrial septum?
This early study describes the methodology for using ultrasonocardiotomography and echocardiography to visualize the interatrial septum and detect atrial septal defects.
Purpose: The features of the interatrial septum and its motion were studied by ultrasonocardiotomography and echocardiography. Based on the results of the above study, the detection of the ostium secundum defect of the interatrial septum was examined in the transverse and sagittal section of the ultrasonocardiotomogram. The possibility of detecting the defect by the conventional echocardiogram was also studied. Method and Materials: Ultrasonograph Model SSD-10 manufactured by Japan Radiation & Medical Electronics with a unit for synchronization with the electrocardiogram was used to record ultrasonocardiotomograms (Fig. 1). To obtain an echocardiogram in a certain direction on the tomogram, Model SSD-5 from the same manufacturer was used, connected to Model SSD-10. The frequency of ultrasound used was 2.25 MHz and the rate of the pulse repetition was 937.5 Hz. The transducers used made of barium titanate were round, 30 mm and 50 mm in diameter and concave with a radius of curvature of 20 cm. The azimuth =and distance resolving power of the both transducers was 3 mm at the distance of 20 cm. The patients were examined in the supine position. The transducer was operated in a vinyl bag on the chest wall filled with bubbleless water. The distance of the transducer from the chest wall was set at over 10 cm so that the ultrasound beam was focused nearly at the midportion of the heart and the tomogram of the heart was not disturbed by the second reflection from the chest wall. Sector scanning was mainly used and compound scanning only in cases of remarkably enlarged heart. The angle of the sector scanning was 50 in degrees and the time in one sector scanning was 0.4 sec. In order to obtain a satisfactory tomogram of the heart at a desired phase in a cardiac cycle, the synchronizing unit introduced by Kikuchi and Tanaka was adopted. The R wave of the electrocardiogram was used as a trigger and by a delaying circuit the cathode ray tube was brightened in a scheduled phase of each cardiac cycle. Setting the unblanking time of the cathode ray tube from 25 msec to 50 msec, a tomogram was completed during about twenty successive heart beats (Fig. 2). Features of the echo of the interatrial septum were examined in 7 cases of primary myocardial disease, 7 cases of ventricular septal defect, 1 case of A-V block, 6 healthy subjects and 21 cases of atrial septal defect.
Masayuki Matsumoto (Tue,) conducted a observational in Atrial septal defect and other cardiac conditions (n=42). Ultrasonocardiotomography and echocardiography was evaluated on Detection of ostium secundum defect of the interatrial septum. Ultrasonocardiotomography and echocardiography were utilized to examine the interatrial septum in 42 subjects, including 21 with atrial septal defects, though specific results were not reported.