This period can allow for safe transport. In the meantime, wounds should be cleaned gently with alcohol or hydrogen peroxide and dressed. The extremity should be kept level with the heart if possible and observed for swelling. Although it is less lethal than drowning, hypothermia is dangerous and must be respected. Cold climates, cold water, and wet clothing all lead to lower body temperatures while paddling.
Prevention is the best tactic.
Always overdress in layers with the idea that you can cool off if necessary. Minimize exposure to wind and cold water. Many of the newer fleece-lined rubberized products are excellent at preventing heat loss. The trunk will feel cold to the touch and the body may be rigid. In severe cases, pulse and respiration may be absent, but the patient may not be dead and should not be considered so until rewarming has been accomplished.