1. Large v-waves seen on the monitor during PAC placement suggest increased left atrial pressure. 2. A patient experiencing symptoms during catheterization like tachypnea and hypotension likely has a punctured vessel, and left lateral positioning could help diagnose and treat a potential pneumothorax. 3. Inadvertently injecting a small amount of air into a PAC is unlikely to cause serious harm and may only result in transient dyspnea.