Cedrick
Forum Fanatic
Topics: 320
Posts: 1,928
|
A 10 year old boy is sent to the principal's office by his teacher
while waiting outside the office,he becomes very anxious,starts to hyperventilate and faints
A decrease in which of the following is the most likely cause of decrease in cerebral blood flow ?
a.-arterial Pco2
b.-aretrial pH
c.-aretrial Po2
d.-cardiac output
e.-pulse
|
| drpkaur
Forum Guru
Topics: 195
Posts: 808
|
Is it A???
|
| Cedrick
Forum Fanatic
Topics: 320
Posts: 1,928
|
|
| muzammil
Forum Guru
Topics: 16
Posts: 654
|
an easy one
a
|
| sridevibandaru24
Forum Guru
Topics: 33
Posts: 434
|
A
|
| twesting2173
Forum Senior
Topics: 7
Posts: 65
|
i understand why the pco2 went donw, but i dont understand why that is the cause of the decreased blood flow. can someone help? thansk
|
| blueocean
Forum Senior
Topics: 15
Posts: 195
|
Because CBF decreases during hyperventilation.
|
| goodyear
Forum Guru
Topics: 16
Posts: 409
|
yes A.. decrease in CO2.
Is this the same as "tachypnea'?
|
| young_doc
Forum Guru
Topics: 55
Posts: 732
|
Simple conception question, straight out of First Aid.
Autoregulation in the brain (hence the decrease in CBF here) is controlled mainly via CO2.
Continuning this thread, what are main regulators of autoreg in the Heart & Skeletal muscle?
___________________
First Aid is my Bible...
|
| Musuq
Forum Guru
Topics: 103
Posts: 425
|
Isn't "Autoregulation" or "Intrinsic regulation" based on the tissue metabolism itself of the organ, x.e. Adenosine production in the heart?
And isn't it different, the flow regulation between resting vs exercising skeletal muscle? 
|
| young_doc
Forum Guru
Topics: 55
Posts: 732
|
As far as i know, autoregulation simply refers to an organ being able to alter the blood flow to meet its demands.
In this case, the brain mainly alters its blood supply based on blood CO2 levels.
Corrections appreciated.
___________________
First Aid is my Bible...
|
|
| |
| | | | | | | | | | | |
