A London Marathon runner was left in a coma after drinking too much water during the race.
Johanna Pakenham, 53, drank more than a dozen bottles of water to try and cope with the heat, and has no recollection of crossing the finish line.
The mother-of-four later suffered a seizure at home, with her partner being forced to perform CPR to keep her alive until the ambulance arrived.
Ms Pakenham, from Wadwick, Hampshire, drank so water her sodium levels became abnormally low in a life-threatening condition know as hyponatremia.
According to The Met Office, the latest London Marathon was the hottest on record, hitting highs of of 23.2 C.
Now fully recovered, Ms Pakenham is speaking out to raise awareness of the dangers of drinking too much water while running.
‘There is such a thing as too much water’
Ms Pakenham said: ‘I love running and I’ve been doing it for years. I’ve taken part in four marathons, although this was my first one in 15 years.
‘I saw my family at the beginning and apparently, I saw them three times throughout, but I have no recollection of that.
‘I remember my dad’s voice in my head saying “make sure you stay hydrated” but without the electrolytes, the water was doing more harm and making me worse, there is such a thing as too much water, which I learnt.’
‘I have no recollection of it’
Ms Pakenham believes she drank a small bottle of water at around 20 stations along the route but was not replenishing the electrolytes she lost with ‘energy’ drinks.
She said: ‘I had about 400 metres to go and I remember saying “I’m wobbly” and my family couldn’t believe I wasn’t going to cross that finish line.
‘There’s a picture of me taken at the starting line and I look fine, then I had a photo taken at the finish line, I have no recollection of it being taken.
‘I don’t recognise that woman in that photo.’
Ms Pakenham (right) started to feel ‘wobbly’ after stopping at 20 water stations on the route
She saw her family three times throughout the race but has no recollection of any of them
WHAT IS HYPONATREMIA?
Hyponatremia occurs when somebody’s blood sodium levels are abnormally low.
Sodium regulates the amount of water in and around people’s cells.
Hyponatremia causes the sodium in people’s bodies to dilute, which leads to a rise in water levels and swollen cells.
Symptoms may include:
- Nausea and vomiting
- Lose of energy and dizziness
- Muscle weakness, cramps or spasms
Causes can include drinking too much water, particularly during endurance events when sodium is lost through sweat.
Other causes may include taking certain medications, like antidepressants, as well as heart failure, extreme vomiting or taking the recreational drug Ecstasy.
Treatment focuses on addressing the underlying cause, if possible.
In non-serious cases this may include people altering their diets to include less water.
Severe cases may require IV fluids to slowly raise sodium levels in people’s blood.
Source: Mayo Clinic