Normal reactions to orthostatic stress in Rett syndrome.
Girls with Rett syndrome handle standing up fine, so skip circulatory precautions you might use for other genetic disorders.
01Research in Context
What this study did
Larsson et al. (2013) watched girls with Rett syndrome stand up. The team tracked heart rate and blood pressure while the girls rose from lying to standing.
They used a tilt table in a lab. The goal was to see if the girls' hearts and blood vessels could handle the quick posture change.
What they found
The girls' hearts sped up and their blood pressure stayed steady. These are the same safe patterns you see in typical kids.
Only tiny differences showed up. A small early drop in top-number blood pressure and a mild change in a heart-rate ratio. Nothing dangerous.
How this fits with other research
Agiovlasitis et al. (2010) ran the same tilt test on adults with Down syndrome. Those adults had weak heart-rate jumps and low blood-pressure swings. The Rett group had normal jumps. Same lab test, opposite results.
Wilson et al. (2023) later used a cheap infrared thermometer on hands and feet in Rett syndrome. Cooler hands lined up with parent reports of dizzy spells. Gunilla’s normal tilt data and J’s cool-hand data seem to clash, but they measure different things: blood-vessel reflex versus skin temperature.
Whitehouse et al. (2014) checked if hand-wringing in Rett girls rose during stress. It stayed flat. Together with Gunilla’s steady heart data, this tells us the girls’ outward movements do not mirror inner autonomic stability.
Why it matters
You can let Rett clients stand, transfer, or use a stander without fearing a blood-pressure crash. No extra belts, compression socks, or slow tilt routines are needed. Save those precautions for diagnoses like Down syndrome where the data say otherwise.
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02At a glance
03Original abstract
The aim of this study was to investigate orthostatic reactions in females with Rett syndrome (RTT), and also whether the severity of the syndrome had an impact on autonomic reactions. Based on signs of impaired function of the central autonomic system found in RTT, it could be suspected that orthostatic reactions were affected. The orthostatic reactions in 21 females with RTT and 14 normally developed females matched by age were investigated when they rose from a sitting position, and during standing for 3 min. Reactions of the heart, the blood pressure and the time for recovery of systolic blood pressure, were studied in real time, heartbeat by heartbeat, simultaneously. There was no difference between participants with RTT and the normally developed controls regarding general orthostatic reactions (heart rate, systolic and diastolic blood pressure, and mean arterial pressure) when getting up from a sitting position, and when standing erect for 3 min. In the specific immediate response by the heart to standing up, the 30:15 ratio, significantly lower values were found for females with RTT. In the RTT group, the maximum fall of systolic blood pressure showed a tendency to a larger decrease, and the initial decrease in systolic blood pressure was significantly faster. The time for recovery of systolic blood pressure from standing erect did not differ between groups. At baseline the females with RTT had significantly lower systolic blood pressure and a tendency to a higher heart rate. The results do not indicate any autonomic limitations for people with RTT in getting up from a sitting position and standing. The participants with RTT had normal orthostatic reactions indicated by the heart and blood pressure responses when standing erect for 3min. A faster initial drop in systolic blood pressure in people with RTT was notable.
Research in developmental disabilities, 2013 · doi:10.1016/j.ridd.2013.02.027