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The investigators used transesophageal echocardiography (TEE) to assess the change of pulmonary blood flow and bi-ventricular function during lung isolation. The investigators hypothesized that changes in pulmonary venous flow with lung isolation may be related the shunt fraction and oxygenation during one lung ventilation (OLV). The investigators also observed the cardiac function during two lung ventilation (TLV) and OLV in supine and lateral position by TEE.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| one lung group | Experimental |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| transesophageal echocardiography(TEE) | Procedure | Transesophageal echocardiography examination will be performed TLV in supine and lateral position, 10, 20 and 30 min during OLV in left lateral decubitus position. By using the transesophageal echocardiography, we will evaluate the changes of pulmonary blood flow and cardiac function. |
| Measure | Description | Time Frame |
|---|---|---|
| The change of pulmonary blood flow | Pulmonary blood flow = PVA(cross sectional area of LUPV) x VTI(velocity time integral) x HR , Fractional area change = [(LVAd-LVAs)/LVAd] × 100 Ejection fraction = [(LVEDV(LV end-diastolic volume) -LVESV(LV end-systolic volume)/LVEDV] × 100 | two-lung ventilation in the supine (T1) and lateral position (T2) and 10 (T3), 20 (T4), and 30 min (T5) during OLV in the left lateral decubitus position. |
| Measure | Description | Time Frame |
|---|---|---|
| The changes of respiratory parameters | shunt fraction Qs/Qt = (CcO2- CaO2)/(CcO2- CvO2) CcO2 = Hgb x 1.34 x ScO2 + PcO2 x 0.003, lung compliance : Compliance= Vt / Pplat, physiologic dead space : Vd/Vt = 1.14 x (PaCO2 - PETCO2)/PaCO2- 0.005 | two-lung ventilation in the supine (T1) and lateral position (T2) and 10 (T3), 20 (T4), and 30 min (T5) during OLV in the left lateral decubitus position. |
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Inclusion Criteria:
Exclusion Criteria:
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| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Department of Anaesthesiology and Pain Medicine, Anaesthesia and Pain Research Institute, Yonsei University College of Medicine | Seoul | 120-752 | South Korea |
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| The change of cardiac function | two-lung ventilation in the supine (T1) and lateral position (T2) and 10 (T3), 20 (T4), and 30 min (T5) during OLV in the left lateral decubitus position. |