Questions Flashcards
To learn how the questions are asked
What is the time constant?
The amount of time it takes for a signal to fall 37% off the original calibration amplitude is called the time constant. It is also sometimes referred to as the fall time. The rise time is the time it takes a signal to rise to 63% of its peak amplitude
Which filter would be used to adjust the rise time of a signal?
The HFF is used to adjust the rise time of a signal. The higher this filter is st the faster the signal wave will rise. The LFF is used to adjust the time constant, or fall time. Gain and sensitivity mean the same thing and will not affect the shape of the wave, only the size of the signal display
What is the difference between a thermocouple and a pressure transducer?
The thermocouple, also called a thermometer, measures the chance in temperature of air going into and out of the nose and mouth and thereby gives an airflow signal. The pressures transducer creates an airflow signal by measuring the change in air pressure going into and out of the nose only. Neither senator can measure the air volume.
What is the difference between SpO2 and SaO2?
Both SpO2 and SaO2 are measures of the same thing, the amount of hemoglobin that is saturated with oxygen in the pt’s blood, but SaO2 is the more accurate measurement because it is measured by an arterial blood gas.
If the total circumference of a head is 58 cm, using the international 10-20 electrode placement system, what is the distance between C3 & O1
If the total circumference of the head is 58 cm then C3 & O1 are 50%of the total circumference of the head away from each other. When dealing with %’s and the total head circumference in electrode placement, multiply the total circumference by the %’s that a lead should be placed in relation to your reference lead. In this case 58 x 50% (0.5) yields the correct answer of 29 cm.
Using the international 10-20 electrode placement system, the C4 lead is located what present of the total circumference away from the C3 lead
The C4 lead is located on the right side of the head 40% of the total circumference of the head away from C3 lead that is on the left side of the head. Directly in between the two (20% off the total circumference of the head) is the Cz ground lead. An example of this would be if a head had a total circumference of 52 FM then the C3 would be 20.8 FM away from the C4 lead
Where is the O1 lead located in relation to the T3 lead
The O1 lead is on the left side of the head, 20% of the total circumference of the head behind the T3 lead. The O2 lead is on the right side of the head, 20% of the total circumference of the head behind T4 leaf. An easy way to remember which side of the head a lead is on its too remember that odd #’s on the left, even #’s on the right
________ is measured in Hz and ________ in microvolts.
Frequency, or the number of times a wave occurs, is measured in Herts, or cycles per second. This is the number of times a wave will repeat itself in one second. Voltage is measured in volts, and in polysomnography, in microvolts. Amplitude is a measure of the height of a wave; therefore the more microvolts, the bigger the wave.
In polysomnography, sensitivity is generally measured in?
Sensitivity is measured in microvolts per millimeter, or uV/mm. what this means is that for each microvolts ofa wave, the display will measure it in one mm. this also means that the larger the number of microvolts per millimeter, the smaller the wave will be displayed, because it will take more voltage to change the signal.
