Term
| Where is the exploring electrode placed on a two-lead EKG for a sleep study? |
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Definition
| Low on the left ribcage, vertically aligned with the hip. |
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Term
| The distance from the left prearicular point to the right prearicular point is 36 cm. What is the distance frim Cz to T3? |
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Definition
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Term
| Where is the reference electrode placed on a two lead EKC for a sleep study? |
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Definition
| High on the right chest, horizontally aligned with the right shoulder. |
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Term
| How is electrical current calculated? |
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Definition
Current (I) equals voltage (V) divided by resistance (R):
I=V/R |
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Term
| The distance from Fp1 to O1 (through C3) is 24 cm. What is the distance from Fp1 to F3? |
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Definition
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Term
| How far apart are the leg EMG leads placed? |
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Definition
| 2-3 cm apart, aligned vertically. |
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Term
| What additional channels are typically included when performing a REM behavior disorder study? |
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Definition
| Arm EMG channels, additional EEG channels to rule out seizures |
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Term
| What is the recommended sampling rate for EEGs, EOGs, EKGs, and EMGs |
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Definition
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Term
| What is the optimum range for impedances in EEG channels? |
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Definition
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Term
| How does an oximeter estimate the blood oxygen level? |
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Definition
| Compares the amount of light absorbed by hemoglobin (ratio of oxygenated vs deoxygenated) and displays a % saturation. |
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Term
| What is the recommended LFF for the SpO2 channel? |
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Definition
| It is a DC channel so no filters are needed. |
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Term
| What is the recommended LFF for EEG channels? |
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Definition
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Term
| What is the recommended HFF for EOG channels? |
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Definition
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Term
| What does a frequency response curve show? |
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Definition
| The amplifier's ability to eliminate unwanted signals through the use of filters. |
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Term
| What is the difference between a thermister and a thermocouple? |
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Definition
Thermocouples detect the rate of themperature change by using two dissimilar metals that are sensitive to temp change.
Thermistors use a Wheatstone bridge to amplify the difference in temperature between expired air and room air. |
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Term
| What is the time constant? |
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Definition
Amount of time for a calibration wave to fall from its highest point or peak to 37% of the peak.
Also called the fall time. |
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Term
| Increasing sensitivity does what to the appearance of a wave? |
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Definition
| Makes the height of the wave shorter/smaller. |
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Term
| What filter directly impacts fall time? |
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Definition
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Term
| When looking at a calibration wave, what is the rise time? |
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Definition
The amount of time it takes for the wave to travel from its baseline to 63% of its peak.
(Usually measured in 100ths of a second.) |
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Term
| What waveform characeristic is directly affected by the voltage of the input signal? |
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Definition
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