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 $33.88.
Records show that Pfizer officially filed for registration of a Class A stock with the U.S. Securities and Exchange Commission on 10 August 2012. Zoetis' IPO on 1 February 2013 sold 86.1 million shares for US$ 2.2 billion. Shares sharply rose 19% by the end of the trading day to $35.01 a share, up from $26.