Canberra Hospital has been operating under "extreme stress" with the latest quarterly report showing its emergency department performance has yet again hit a new low.
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New figures also revealed the hospital was operating above capacity for half of June, while corridor beds were used in the emergency department for most of the month.
The latest performance report for ACT's public health services shows just 21 per cent of urgent patients at the hospital were seen on time between July and September.
Half of all urgent patients waited longer than 82 minutes to be seen - clinical guidelines state those patients should be seen within 30 minutes. It amounted to a six per cent increase compared to the last quarter.
There was some good news with the median wait for emergency patients dropping from eight minutes to seven.
Calvary Public Hospital's performance also slipped during the quarter but its overall performance is still stronger than Canberra Hospital's.
At Calvary, 33 per cent of urgent patients were seen on time while half of patients waited longer than 56 minutes to be seen.
Concerningly, the figures showed not all patients who came to the hospital and needed to be resuscitated were immediately treated, with 98.6 per cent of category one patients seen on time
Across ACT, all categories, except emergency patients, suffered a drop in performance compared to the last quarter of 2018-19.
The wait time of urgent patients increased the most, from 64 to 71 minutes between.
Across all ACT acute hospitals, the figures showed an 11 per cent increase in the number of patient bed days.
The figures, released quarterly, came about a week after the latest national figures from the Australian Institute of Health and Welfare painted a bleak picture of ACT's emergency departments compared to the rest of the country.
Canberra Hospital performed poorly among its peer group of major hospitals.
Data released through answer to questions on notice showed Canberra Hospital's use of "corridor beds" this flu season rose sharply.
There were 43 days this year where trolleys were used in emergency department corridors during the flu season. In 2018, there were 28 days the hospital used the corridor beds.
June was the peak time for the use of corridor beds, used for 19 days.
It was also the month the whole hospital was under the most strain, operating above its capacity for 15 days.
Health Minister Rachel Stephen-Smith said the figures showed fewer Canberrans were presenting to the ED for non-urgent conditions.
"The numbers we're seeing indicate that providing Canberrans with access to other healthcare services over this period helped to alleviate some of the pressure on our EDs during a very busy period," she said.
"Nevertheless, a combined increase in Category 1 and 2 presentations (resuscitation and emergency) of more than 6 per cent compared with the previous quarter had an impact on performance in terms of waiting times for less critically unwell patients."
Ms Stephen-Smith said the two hospitals had largely been able to maintain their performance over the busy winter period.
Opposition Health Spokeswoman Vicki Dunne said the hospital was under extreme stress.
"We just don't have enough beds," she said.
"It shows that we need something other than surge beds in winter time, we need more hospital beds. We haven't kept pace with the number of hospital beds and that means you have blockages in various places."
"You can't fix it overnight, this is 18 years of neglect. But we would be trying to as much as possible fast track the building of new facilities. We can't faff around waiting for years for this to happen."