Pakistan Heatwave Deaths Near 700

Pakistan's PM Nawaz Sharif has called for emergency measures as the death toll from a heatwave in southern Sindh province reached nearly 700.

The army is now being deployed to help set up heat stroke centres, with temperatures reaching 45C (113F).

Officials have been criticised for not doing enough to tackle the crisis.

There is anger among local residents at the authorities because power cuts have restricted the use of air-conditioning units and fans, correspondents say.

Matters have been made worse by the widespread abstention from water during daylight hours during the fasting month of Ramadan.

Sporadic protests

On Tuesday, the National Disaster Management Authority (NDMA) said it had received orders from Mr Sharif to take immediate action to tackle the crisis.

This came as Sindh province Health Secretary Saeed Mangnejo said 612 people had died in the main government-run hospitals in the city of Karachi during the past four days. Another 80 are reported to have died in private hospitals.

Many of the victims are elderly people from low-income families.

Thousands more people are being treated, and some of them are in serious condition.

Hot weather is not unusual during summer months in Pakistan, but prolonged power cuts seem to have made matters worse, the BBC's Shahzeb Jillani reports.

Sporadic angry protests have taken place in parts of Karachi, with some people blaming the government and Karachi's main power utility, K-Electric, for failing to avoid deaths, our correspondent adds.

How the body copes with extreme heat

The body's normal core temperature is 37-38C.

If it heats up to 39-40C, the brain tells the muscles to slow down and fatigue sets in. At 40-41C heat exhaustion is likely - and above 41C the body starts to shut down.

Chemical processes start to be affected, the cells inside the body deteriorate and there is a risk of multiple organ failure.

The body cannot even sweat at this point because blood flow to the skin stops, making it feel cold and clammy.

Heatstroke - which can occur at any temperature over 40C - requires professional medical help and if not treated immediately, chances of survival can be slim.

There are a number of things people can do to help themselves. These include:

• wearing damp clothes which will help lower the body's temperature
• sticking one's hands in cold water
• placing fans next to windows as this will draw air from outside, which should be cooler
• wearing looser clothes
• having a lukewarm shower rather than a cold one
• fanning the face rather than other parts of the body