The Manitoba Government and General Employees' Union says some ambulance workers can work up to 24 hours straight, due in part to a shortage of ambulances and long waits to drop off patients at hospitals.
Union president Lois Wales says she hopes an external review announced by the NDP government will put more resources into the system.
Health Minister Theresa Oswald says a review is now underway to look for improvements to the province's emergency medical services.
Oswald says the government has added resources in recent years, including more paramedics, more training programs and a new ambulance helicopter.
Also on HuffPost