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Tingling - issue with table in book?
incognico created the topic: Tingling - issue with table in book?
Chapter 2 and chapter 7 of the HPL book clearly describe tingling (in the arms & hands) as a symptom of hyperventilation.
The revision tests for both these chapters include very specific questions linking tingling with hyperventilation.
However - the table at the bottom of page 69 (Condition/Symptoms/Treatment) shows tingling as a "main symptom" of Hypoxia. The entry for hyperventilation does not mention tingling.
Am I correct in thinking this table must be wrong?
I have checked the errata page and there's nothing since my book's revision date except the comments on REM sleep.
John.Heddles replied the topic: Tingling - issue with table in book?
Be very wary of trying to push hypoxic symptoms into a neat box.
One of the reasons the military require chamber runs is to accustom folks to their own particular hypoxic symptoms. Some folk don't recognise anything much - I thought I was going great, didn't know I had passed out and knew nothing more until the flight surgeon got around to putting my mask back on.
Not everyone experiences the neat textbook story ... one of the reasons I am amazed that civil high flyers are not required to do at least one run to have a looksee at the problem as it might affect their particular physiology.
Engineering specialist in aircraft performance and weight control.
baddles replied the topic: Tingling - issue with table in book?
I agree with Nick that this appears to be an error in the table.
Tingling is listed as a common symptom of hyperventilation in several medical texts that I consulted. The reason given is that hyperventilation reduces the CO2 concentration in blood, which makes the blood more alkaline, which causes constriction of blood vessels supplying the brain, resulting in sensations of numbness and tingling in extremities. Tingling is not listed as a symptom of generalized hypoxia in the texts I consulted. This makes sense because the brain is largely unaware of hypoxia.
I once watched a doctor treating a patient who was hyperventilating, and the first question he asked was 'are your fingers tingling'. This suggests that tingling is useful in differential diagnosis (deciding whether the person has hyperventilation or hypoxia).
Yes, granted, every person responds differently, but there are still features which are typical and atypical of each illness.