April 15, 2015

Heavy Snoring, Sleep Apnoea May Signal Earlier Memory and Thinking Decline

MINNEAPOLIS -- April 15, 2015 -- Heavy snoring and sleep apnoea may be linked to memory and thinking decline at an earlier age, according to a study published in the April 15, 2015, online issue of the journal Neurology.

The research also suggests that treating the disorders with a breathing machine may delay the decline.

“Abnormal breathing patterns during sleep such as heavy snoring and sleep apnoea are common in the elderly, affecting about 52% of men and 26% of women,” said Ricardo Osorio, MD, NYU Langone Medical Center, New York, New York.

For the study, the medical histories for 2,470 people aged 55 to 90 years were reviewed. Participants were categorised as either free of memory and thinking problems, in early stages of mild cognitive impairment (MCI), or with Alzheimer’s disease.

The researchers also looked at people with untreated sleep breathing problems versus those without the sleep breathing problems and also untreated versus treated people with sleep breathing problems.

The study found that people with sleep breathing problems were diagnosed with MCI an average of nearly 10 years earlier than people who did not have sleep breathing problems. For example, when researchers examined only people who developed MCI or Alzheimer’s disease during the study, those with sleep breathing problems developed MCI at an average age of 77, compared with an average age of 90 for those who did not have sleep breathing problems. Among that group, those who had sleep breathing problems also developed Alzheimer’s disease 5 years earlier than those who did not have sleep breathing problems, at an average age of 83 versus 88 years.

The researchers found that people who treated their sleep breathing problems with a continuous positive airway pressure (CPAP) machine were diagnosed with MCI about 10 years later than people whose problems were not treated, or at age 82 instead of age 72.

“The age of onset of MCI for people whose breathing problems were treated was almost identical to that of people who did not have any breathing problems at all,” said Dr. Osorio. “Given that so many older adults have sleep breathing problems, these results are exciting -- we need to examine whether using CPAP could possibly help prevent or delay memory and thinking problems.”

Dr. Osorio noted that more research is needed. “These findings were made in an observational study and as such, do not indicate a cause-and-effect relationship,” he said. “However, we are now focusing our research on CPAP treatment and memory and thinking decline over decades, as well as looking specifically at markers of brain cell death and deterioration.”

SOURCE: American Academy of Neurology
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