1. Lower impedance indicates greater intrathoracic fluid volume and blood flow. 2. I assume it is related the raised intrathoracic pressure caused by coughing. 3. In this situation the abnormality is usually referred to as an intrathoracic stomach. 4. During expiration, the positive intrathoracic pressure causes decreased blood return to the right side of the heart. 5. During respiratory inspiration, the negative intrathoracic pressure causes increased blood return into the right side of the heart. 6. The negative intrathoracic pressure may cause the left atrium to expand and stretch its walls during each OSA event. 7. They also significantly increase negative intrathoracic pressures that can harm internal structures and potentially impair post-operative recovery. 8. "' Tracheal deviation "'is a clinical sign that results from unequal intrathoracic pressure within the chest cavity. 9. So if the vein gets cut, it cannot close and air is sucked in due to negative intrathoracic pressure causes air embolism. 10. This retardation of the blood also occurs in lung lesions, such as chronic interstitial pneumonia, pleural effusions, and intrathoracic tumors.
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