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Doctor’s conduct ‘beyond human error’

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Coroner criticises surgeon's treatment of patient, who died after knee replacement surgery, and calls for proper handover procedure

The way a doctor treated a patient who died following total knee replacement "goes beyond mere human error", said the coroner at the conclusion of a seven-day hearing.

The coroner criticised Dr Sean Ng Yung Chuan for failing to make detailed notes or hand the patient over to another specialist when he had planned to travel after operating on her.

If he had done so, tell-tale signs that something was wrong might have been noticed and action could have been taken.

State Coroner Kamala Ponnampalam flagged Dr Ng's behaviour which "demonstrated a clear departure from the standards expected of a physician who had primary care of a post-surgery patient".

To reduce preventable deaths in future, the coroner suggested it should be made mandatory that "if a doctor delivering primary care to a post-surgery patient is going to be unavailable, he must arrange for another doctor to cover him".

"There should also be guidelines for a proper handover," she added.


Dr Ng had done a total knee replacement for Mrs Yuen Ingeborg, then 78, in November 2016. Unfortunately, Mrs Yuen died within a week of the operation. Dr Ng travelled to Tokyo the day after the operation.

During the surgery, Dr Ng accidentally cut her medial collateral ligament. He called another orthopaedic surgeon for help to repair the cut ligament. The patient appeared fine after the operation.

The next morning, her haemoglobin count was low, so Dr Ng prescribed the transfusion of a pint of blood.

What Dr Ng did not realise was that both Mrs Yuen's popliteal artery and vein had also been cut, leading to internal bleeding and restricted blood flow that cost the patient, first her leg which had to be amputated, and later her life as the delay in treatment allowed poisons into her body. She died of multi-organ failure.

The coroner noted that Mrs Yuen's son and daughter had asked how Dr Ng "had managed to sever both the popliteal artery and vein and then fail to recognise that he had done so".

Dr Tang Jun Yip, a vascular surgeon at Singapore General Hospital (SGH), which does more than 2,000 knee transplants a year, said there have been no reported cases of both artery and vein being cut.

Professor Yeo Seng Jin, a senior orthopaedic surgeon at SGH, said he had never seen something like this happen. He added that Mrs Yuen would have complained of numbness and pain when the anaesthesia wore off.

According to the coroner's report, Prof Yeo questioned if Dr Ng "did actually physically examine Mrs Yuen's lower limb post-operatively. If he did not, then he is negligent for failing to do so".

Another expert, Mr Nicholas Goddard of the Royal Free Hospital in London, who was brought in by the patient's family, said the cutting of both the artery and vein was "the result of poor surgical technique".

That Dr Ng travelled to Tokyo without handing over the patient to another specialist was "injudicious".

Dr Ng later added to the notes, without indicating that this was done after he returned from Tokyo. Prof Yeo said this clearly contravened the Singapore Medical Council (SMC) guidelines.

Mount Elizabeth Hospital has filed a complaint with the SMC against Dr Ng on this matter.

Another complaint - on a separate matter - was made against Dr Ng in 2017. It was dismissed but the appeal against it is pending.

The two complaints were revealed by Dr Ng's Ardmore Medical Group in its prospectus when it planned an initial public offering on the Catalyst Board in June.