Kokyu to junkan. Respiration & circulation
-
We measured the mixed venous oxygen saturation (SvO2) continuously using a fiberoptic thermodilution pulmonary artery catheter to analyze the time course of SvO2 during exercise, and evaluated the relationship between SvO2 and exercise load, SvO2 and cardiac output. Five patients with old myocardial infarction and one healthy man underwent pulmonary arterial catheterization and then performed an incremental steady state exercise test using a supine cycle ergometer. ⋯ SvO2 correlates well with cardiac output by the thermodilution method in individual patients. We conclude that a fiberoptic thermodilution pulmonary artery catheter was useful to evaluate the dynamic changes of SvO2 during exercise.
-
A 32-year-old man who suffered from acute myocardial infarction due to blunt chest trauma was admitted to our hospital. The first coronary angiography was performed on the 38th day after admission. We found aneurysmal dilatation, intimal flap and subintimal hematoma, so coronary dissection of the left anterior descending branch was suspected. When the second coronary angiography was performed 11 months later, those findings had disappeared.
-
Case Reports
[Chronic intractable pericardial effusion associated with pulmonary hypertension: report of two cases].
We report two cases of chronic intractable pericardial effusion associated with pulmonary hypertension. Case 1. A 35-year-old women was admitted to our hospital because of dyspnea and edema. ⋯ In summary, chronic pulmonary hypertension should be added to the list of conditions known to cause pericardial effusion. In these cases, echocardiography revealed important signs, and cardiac catheterization was essential for definite diagnosis. Pericardial effusion associated with pulmonary hypertension was refractory to diuretics and vasodilators.
-
We assessed breathing patterns during pressure support ventilation (PSV) and its relationship with the work of breathing in 10 postoperative patients. With increasing levels of pressure support, minute ventilation and tidal volume increased with a decrease in respiratory frequency. Increased minute ventilation was achieved by increased mean inspiratory flow. ⋯ Furthermore, PSV reduced the inspiratory work added by a ventilator to near zero. Oxygen consumption was also decreased with PSV. We conclude that PSV improved the breathing patterns and minimized the work of breathing spontaneously via a ventilator.