nonpolar covalent bond. (physical chemistry). A bond in which a pair of electrons is distributed or shared equally between two atoms. 1  Facebook.2  Twitter.onpolar covalent bond. (physical chemistry). A bond in which a pair of electrons is distributed or shared equally between two atoms. 1  Facebook.
When is a barrel chest a sign of a disease process? Chronic obstructive pulmonary disease (COPD) is the most common instance in which a barrel chest will occur. In these cases, itâs a sign of the lungs being over-expanded. This is caused by the loss of elasticity and results in the person having hyper-inflated lungs.
Doxapram for ventilatory failure due to exacerbations of chronic obstructive pulmonary disease. Some people with advanced COPD (chronic obstructive pulmonary disease) experience respiratory failure whereby blood oxygen levels fall and high levels of the waste gas carbon dioxide accumulate and cause worsening symptoms.In extreme cases this disturbance in the blood can cause coma and death.rogressive means the disease gets worse over time. COPD can cause coughing that produces large amounts of mucus (a slimy substance), wheezing, shortness of breath, chest tightness, and other symptoms.