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Expectation of life and unexpected death in open spina bifida: a 40-year complete, non-selective, longitudinal cohort
Pippa Oakeshott1, Gillian M Hunt, Alison Poulton
1Community Health Sciences, St George's, University of London, London, UK. oakeshot@sgul.ac.uk
Insights
Adults with open spina bifida face a high and continuing mortality rate, with many unexpected deaths occurring throughout life. This highlights the need for ongoing medical awareness and care planning for this population.
Area of Science:
- Medical research
- Public health
- Pediatric neurology
Background:
- Open spina bifida is a complex congenital condition requiring long-term management.
- Previous studies have not fully characterized long-term survival and causes of death in open spina bifida patients into adulthood.
Purpose of the Study:
- To investigate the survival rates and causes of death in a complete cohort of individuals with open spina bifida up to a mean age of 40 years.
Main Methods:
- A prospective, community-based study followed 117 infants born with open spina bifida between 1963 and 1971.
- Survival data were collected through postal questionnaires, telephone interviews, and official death records.
- Kaplan-Meier survival curves were used to analyze mortality patterns.
Main Results:
- One-third of the cohort died before age 5, and an additional 26% died between ages 5 and 40.
- Mortality in adulthood was over 10 times the national average, with half of these deaths being sudden and unexpected.
- High neurological deficit, particularly a sensory level above T11, was associated with significantly poorer survival rates.
Conclusions:
- Contrary to prior assumptions, individuals with open spina bifida experience sustained high mortality throughout adulthood.
- Unexpected deaths, often linked to epilepsy, pulmonary embolism, hydrocephalus, or sepsis, are a significant concern.
- Healthcare providers and care planners must recognize the ongoing risks and need for continuous monitoring and support for adults with open spina bifida.
Aim:
The aim of our study was to investigate survival and causes of death in a complete cohort of open spina bifida at the mean age of 40 years.
Method:
We conducted a community-based, prospective study of 117 consecutive infants (50 males, 67 females) with open spina bifida whose backs were closed non-selectively within 48 hours of birth between 1963 and 1971 at Addenbrooke's Hospital, Cambridge, UK. Of those who survived to age 1 year, 89% (82 out of 92) had a cerebrospinal fluid shunt. In 2007, all survivors were surveyed by postal questionnaire backed up by telephone interview. Details of deaths were obtained from the Office for National Statistics, medical records, and autopsy reports, and Kaplan-Meier survival curves were constructed.
Results:
One in three of the cohort (40/117) died before the age of 5 years. A further 26% (31/117) died during the next 35 years, over 10 times the national average. Half the deaths (16/31) after the age of 5 were sudden and unexpected. All occurred in the community and were followed by a coroner's autopsy. The most frequent causes of these unexpected deaths were epilepsy, pulmonary embolus, acute hydrocephalus, and acute renal sepsis. The prognosis for survival was strikingly poor in those with the most extensive neurological deficit. Only 17% (7/42) of those born with a high sensory level (above T11) survived to the mean age of 40 years, compared with 61% (23/38) of those with a low sensory level (below L3; p=0.001).
Interpretation:
Doctors and care planners need to be aware that, contrary to previous suggestions, there is continuing high mortality throughout adult life in individuals with open spina bifida, and many deaths are unexpected.
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