After 45 minutes have passed, you are feeling good, and you decide to go home. Later that night or the next day, you begin to experience difficulty breathing. Breathing seems to be easier when you sit up and is more difficult when you lie down. A person will aspirate water into the lungs, which causes pulmonary edema. Pulmonary edema is swelling caused when fluid from the body fills the lungs.
Infection can also invade the lungs from the bacteria found in the water.
In either case, this person requires medical attention at the hospital. Anytime someone aspirates water, he must be transported to the hospital and closely monitored. Near drownings can be life-threatening. If you or someone you know has this experience, make sure to seek proper medical attention. Be safe and I'll see ya on the water.