使用新型超声换能器进行连续经胸心脏成像的可行性。

Chandraratna P A, Vijayasekaran S, Brar R, Azer M, Brar B, Gandhi S, Niguse G T, Chen Q

(11-111 Cardiology), Cardiology Section, Medical Health Care Group, Long Beach VA Health Care, 5901 East 7th Street, Long Beach, CA 90822, USA.

Echocardiography. 2001 Nov;18(8):651-5. doi: 10.1046/j.1540-8175.2001.00651.x.

BACKGROUND

The feasibility of hands-free transthoracic continuous ultrasonic cardiac imaging has not been demonstrated previously. We developed a 2.5-MHZ spherical transducer mounted in an external housing to permit steering in 360 degrees (CONTISON). The external housing was attached to the chest wall using an adhesive patch.

METHODS AND RESULTS

The transducer was placed in the third or fourth interspace at the left sternal border to permit imaging of the left ventricle (LV) in its short axis and attached to the chest wall. The transducer then was attached to an ultrasound machine. Ten normal subjects and 20 patients with previous myocardial infarction were studied. The following maneuvers were performed at the beginning of the study: (1) The patient was rotated from the supine position (0 degrees ) in 20 degrees increments to the left lateral decubitus position (90 degrees ). The echocardiogram was displayed continuously and was recorded on videotape (parasternal short-axis view) at 0 degrees, 20 degrees, 40 degrees, 60 degrees, 80 degrees, and 90 degrees. (2) The patient was returned to the supine position and an echocardiogram was obtained. The patient was then seated up 20 degrees, 40 degrees, 60 degrees, 80 degrees, and 90 degrees by using the controls on the bed. (3) The patient then was returned to the supine position and the echocardiogram was displayed continuously on the monitor. The echocardiogram was recorded every 15 minutes for a period of 4 hours. All segments of the LV were visualized in the supine position and during lateral rotation (0 degrees -90 degrees ). Thus, body position did not affect the image. All segments of the LV were visualized during sitting up (0 degrees -90 degrees ), and all segments were visualized during the 4 hours of imaging. The patients were able to move around without distortion of the image.

CONCLUSION

The CONTISON transducer permitted continuous imaging of LV wall motion. Body position did not affect interpretation of wall motion. This device has potential applicability in monitoring LV function in the intensive care setting.

背景

免手持经胸连续超声心动成像的可行性此前尚未得到证实。我们开发了一种安装在外部外壳中的2.5兆赫球形换能器，以实现360度的转向（CONTISON）。该外部外壳通过粘性贴片附着在胸壁上。

方法与结果

将换能器置于左胸骨旁第三或第四肋间，以便对左心室（LV）短轴进行成像，并附着在胸壁上。然后将换能器连接到超声仪上。对10名正常受试者和20名既往有心肌梗死的患者进行了研究。在研究开始时进行了以下操作：（1）患者从仰卧位（0度）开始，以20度的增量向左卧位（90度）旋转。连续显示超声心动图，并在0度、20度、40度、60度、80度和90度时将其记录在录像带上（胸骨旁短轴视图）。（2）患者恢复到仰卧位并获取超声心动图。然后通过使用床上的控制装置将患者坐起20度、40度、60度、80度和90度。（3）然后患者恢复到仰卧位，超声心动图在监视器上连续显示。每15分钟记录一次超声心动图，持续4小时。在仰卧位和侧转（0度-90度）期间，左心室的所有节段均可见。因此，体位不影响图像。在坐起（0度-90度）期间，左心室的所有节段均可见，并且在4小时的成像过程中所有节段均可见。患者能够四处移动而不会使图像失真。