Clinical Impact of Preoperative Transthoracic Echocardiography over 60 Year Old for Noncardiac Surgery

Ryu, Yon Ju; Shin, Gil Ja

Abstract

BACKGROUND: In the background of increasing silver, the measurement of risk factors of cardiovascular system and abilities of controlling that of the aged are becoming the interest. 'Old age' is one of the risk factors of postoperative cardiovascular complication. We summarized diseases, discovered when randomly examined by transthoracic echocardiography (TTE) and frequencies of the diseases in old aged, older than 60 years. So we could discuss the clinical impact of preoperative TTE at resting state over 60 year old for postoperative cardiovascular system of noncardiac surgery.
METHODS
For the period 15months, from September 1, 1999 to January 10, 2001, we examined patients who are older than 60 years, to be scheduled to undergo operation of noncardiac surgery, by using SONOS 1000, made by Hewlett-Packkard, USA. 933 patients (595 men and 337 women) were examined.
RESULTS
We examined 993 patients, 595 men (63.8%) and 337 women (36.2%), who were aged from 60 years to 93 years (average 68.5+/-7.1 years old). 87.2% of patients had left ventricular relaxation abnormatilties, average ejection fraction at resting state was 62.0+/-6.8%, which is in normal range and left ventricular end diastolic diameter was 49.2+/-5.4 mm. Becoming older, average left ventricular ejection fraction is decreasing, average of desceleration time and IVRT, parameters of LV relaxation abnormality, are increasing but they are not stastically meaningful.There were four cases of dilated cardiomyopathy (0.4%) in which two cases were incidentally discovered by TTE and they had no specific past histories. 38 persons (4.1%) had pulmonary hypertension (RVSP, higher than 35 mmHg) and they had no specific complication at the operations and postoperative state. In 3 of the patients who had pulmonary hypertension, one was incidentally discovered, had Atrial septal defect and all of three had normal LV function. In our study there were 333 patients (35.7%) of Mitral regurgitation and 343 patients (36.8%) of aortic insufficiency which are pathologic change of aging, and patients severe than grade III were 3 patients (0.3%). One was treated by postoperative congestive heart failure at intensive care unit and other 2 patients could not be followed because of transfer and against discharge. 3 patients was diagnosed by Mitral valve prolapse of patients of Mitral regurgitation (0.3%). In case of Aortic valve stenosis, most popular vavular heart disease in old aged patients, have no symptom unless that is severe, often incidentally discover at TTE in our study at pre-operative state. There were 10 patients of aortic valve stenosis (1.1% frequency), 9 cases were mild ones and remaining one case was severe and received aortic valve replacement at Chest surgery department.
CONCLUSION
The prevalence of cardiovascular disease that incidentally discovered at TTE in resting state is similar with the result of the reference in for the old aged population and the group of patients who had no symptom at resting state, could have risks of cardiovascular disease. We cannot predict all of the postoperative cardiovascular complication and risks with TTE at resting state in old age patients, but it was useful for screening of valvular diseases, congenital cardiac disease, pulmonary hypertension. It is also good for carrying out before stress TTE with exercise or dopamine. It has an important role for making decision of performing other stress tests in patients who have cardiovascular risk factors and grouping that need to have intervention therapy like the coronary angiography or not. Besides monitoring the cardiovascular system at operation and postoperation periods, medication during the preoperation period and surgical treatments when cardiovascular abnormalities found at TTE, cardiologic medical treatments are needed to lower the postoperative complication rates and improve the prognosis.