A four-year-old girl tragically passed away in September 2024, six months after suffering a critical medical incident in hospital, which was exacerbated by a delay in administering vital medication. The details surrounding the case have emerged following an inquest conducted by South Wales Central Coroner Rachel Knight, raising urgent concerns about the safety protocols in hospitals.
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Summer Mant, who had been diagnosed with MIRAGE syndrome, a rare condition that inhibited her immune response, died on September 21, 2024. According to the coroner’s report, her death followed a catastrophic series of events that began on March 17 when she was admitted to Prince Charles Hospital with a severe infection and virus.

On March 18, while doctors were trying to switch Summer from high-flow nasal oxygen to a CPAP machine, she experienced a sudden drop in oxygen levels. This resulted in a period of hypoxia, leading to cardiac arrest. Knight noted that, during the resuscitation attempt, another cardiac arrest occurred while she was being intubated, resulting in hypoxia that lasted for approximately eight minutes. The inquest concluded that these health crises likely led to an irreversible brain injury from which Summer never recovered.

Her cause of death was ultimately listed as “unexplained multi-organ failure” that developed during her prolonged hospital stay following the acquired brain injury. Although she was transferred to multiple facilities, Summer’s condition did not improve, and she succumbed to her illness in September.
Coroner Knight highlighted an alarming delay during the resuscitation process at Prince Charles Hospital, specifically regarding the administration of adrenaline—an essential medication in the treatment of cardiac arrests. This delay was attributed to staffing levels at that time, with the hospital operating under a “skeleton staff” that comprised mainly junior doctors who were relatively new to their roles.
The coroner remarked upon the absence of a standardised paediatric crash trolley in the hospital as a contributing factor to the delays. Knight emphasized the need for hospitals across Wales to adopt a uniform approach to crash carts in order to prevent similar tragedies in the future.
Katie Wile, a clinical negligence solicitor representing Summer’s family, expressed the profound impact of the loss on those close to her. Describing the heartbreaking findings of the inquest, Wile stated, “Summer’s death has absolutely devastated her family, and the failures identified by the coroner lay bare that she should never have gone through what she did.”
Family members fondly remembered Summer as a “happy, adventurous, loving, cheeky, playful and very active child,” who had bravely faced numerous obstacles throughout her life, supported by her devoted parents and community.
In a closing appeal, Coroner Knight called for immediate action to implement standardised crash carts, stating, “In my opinion, action should be taken to prevent future deaths.” The report has been disseminated to healthcare organisations across Wales, urging them to adopt measures that would enhance patient safety and improve response protocols in emergency situations.
This tragic incident has elicited a strong response from various stakeholders, highlighting the critical nature of timely medical care in paediatric settings. The coroner’s findings serve as a sobering reminder of the need for vigilance and proper resources in hospitals, particularly when treating vulnerable patients.
