The genome of the organism that produces the world's most lethal toxin has been revealed. This toxin is the major weapon in the genome of Clostridium botulinum: less than two kg is enough to kill every person on the planet.
Tension pneumothorax: The most serious type of pneumothorax, this occurs when the pressure in the pleural space is greater than the atmospheric pressure, either because air becomes trapped in the pleural space or because the entering air is from a positive-pressure mechanical ventilator.
A collapsed lung, also known as a pneumothorax, is a condition that occurs when air enters the space between the chest wall and the lung (pleural space). As air builds up, pressure inside the pleural space increases and causes the lung to collapse. A one-way valve mechanism prevents air from escaping the pleural cavity. 2  When the person inhales, more air enters the pleural space, increasing pressure on the lung and heart. 3  This can lead to respiratory compromise and to a drop in blood pressure. 4  If the patient is not treated immediately, death can result.