1999 Fiscal Year Final Research Report Summary
Development of Implantable cardiac echo probe -Asa Monitor for Cardiac Surgery
| Project/Area Number |
09557110
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
Thoracic surgery
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| Research Institution | Keio University |
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Principal Investigator |
YOZU Ryohei Keio University, Dept.of Surg., Assistant Prof., 医学部, 講師 (30129738)
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| Co-Investigator(Kenkyū-buntansha) |
HATSUNAKA Toshiyuki Aloka KK., Research Dept., 技術部・取締役研究職
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| Project Period (FY) |
1997 – 1999
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| Keywords | Cardiac echo / cardiac function / Cardiac Surgery / Implantble echo-probe / postoperative cardiac monitor / 開心術 / 心臓手術 / 人工心臓 |
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| Research Abstract |
In cardiac surgery, postoperative cardiac function is generally monitored by electocardiography (ECG), by invasive measurements of blood pressure, such as aortic pressure, and by the determination of hemodynamic variables, such as cardiac output, with a Swan-Ganz catheter. In recent years, transesophageal echocardiography has been introduced into clinical use, but, for various reasons, including distress and the difficulty of application in postoperative unconscious patients, it is not a popular method of monitoring, Since 1991, we have been developing a small implantable echocardiography probe. This probe was used in 31 patients with severely reduced left ventricular function who underwent open heart surgery and its clinical utility was well demonstrated. No deaths occurred in this series, This new implantable echocardiography probe allowed postoperative cardiac function to be monitored in real-time, The ejection fraction (EF), the cardiac output, the status of valves after valve replacement and/or valvuloplasty, the left and right ventricular wall motion, the presence of cardiac tamponade, and other variables could be assessed. The echocardiography probe can be positioned at any site at which specific information is desired during surgery. It can be inserted as easily as a pericardial drain tube and is removed in the same manner when no longer necessary. This probe has the potential to be very useful for monitoring patients on assisted circulation after open heart surgery.
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