Infection (e.g., gas gangrene) can cause gas to be trapped in the subcutaneous tissues. Subcutaneous emphysema can be caused by medical procedures and medical conditions that cause the pressure in the alveoli of the lung to be higher than that in the tissues outside of them.
So here's a quick look at PFE's most important numbers right now (for April 14, 2017). PFE shares slipped 0.12% or $0.04 from the previous trading session. That took the Pfizer stock price to $33.88.
PKY (PKY) has the following price history information. Looking back at PKY historical stock prices for the last five trading days, on October 27, 2017, PKY opened at $19.04, traded as high as $19.04 and as low as $19.04, and closed at $19.04. Trading volume was a total of 0 shares. On October 30, 2017, PKY opened at $19.04, traded as high as $19.04 and as low as $19.04, and closed at $19.04.