Electronics of Hemodynamics Quiz prep for 1-16-16
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Cap. = | Capacitor Stores energy in farads ex: defibrillator
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| Bat. = | Battery (DC storage device)
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| Gnd. = | Ground (zero voltage, ABSORBS charge)
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| Diode = | Directs current flow in one direction only (changes AC to DC), looks like arrow
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| Res. = | Resistor (inhibits flow of electrons) medical devices and appliances are resistors, force electricity to do work ; represents workload
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| Induct. = | Inductance coil; Transformer; Inductor- stores or converts magnetic flux, think of a coil; boosts current to power x-ray equipment, MRI
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| DC Power does what: | defibrillates- direct current
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| AC power does what: | fibrillates - 120 V; 60sec/cyc
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| What kind of power is found in pacemakers | DC power and parallel circuit
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| The strain gauge converts fluid pressure to an electrical signal using: | variable resistors
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| Two pressure channels are required to record | Simultaneous pressures
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| Calibration assures: | Proper baseline and top pf scale for all channels
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| Adjusting the band pass filter to reduce "noise", you change | Hz (frequency filter)
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| A 40mm scale is commonly used for: | Right heart pressures
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| When using standard disposable transducers with fluid filled catheters, where is the "Wheatstone Bridge" located? In the: | Transducer
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| The electrical signal is converted into a waveform on the screen by a process called: | Modulation-demodulization
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| What is the modem responsible for | Modulation-demodulization
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| The calibration factor for hand calculating pressures sampled on a 100 scale using paper with a grid 50mm high is: | 2 ( 100 divided by 50 = 2)
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| If the transducer is zeroed while lying below the level of the catheter inside the patient's chest, the subsequent pressure reading will be: | mistakenly high
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| The phlebostatic axis refers to the: | Mid-axillary line
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| Phlebostatic axis? | central venous collection of blood - midaxillary, right armpit
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| When monitoring BP by radial arterial line on pt that is in a sitting position where should the zeroing port of the pressure monitoring system be positioned? | at the level of the radial artery catheter
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| Temperature drift of a pressure transducer should be corrected periodically by: | opening to air, and pressing the zero button
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| Your patient has a heart rate of 84. What frequency filter would you select to assure an optimal damping coefficient for a frequency response to the tenth harmonic of his fundamental frequency? | 84 divided by 60 = 1.4; 1.4x 10= 14Hz
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| How do you calculate a patients fundamental frequency? | bpm divided by 60= beats per second
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| How do you find the tenth harmonic of a patients fundamental frequency? | multiply fundamental frequency by 10
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| Hand calculate patients edp for a 200mmHg pressure scale, LV edp 6 small boxes on a 50 mm paper recording 9 each box is 4mm) | 6x4 = 24mmHg
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| Performing the fast flush "Square Wave Test" is for the purpose of: | Testing for optimal damping
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| What is a synonym for zeroing? | balancing
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| How do you confirm the zero baseline? | by opening to air
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| Which of the following would likely be reasons for sampling pressures on a 100 mmHg scale?: normal right heart pressures; normal left heart pressures; AO pressure in a hypotensive patient; PA pressure in a patient with pulmonary hypertension | AO pressure in a hypotensive patient and PA pressure ina patient with pulmonary hypertension
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| Air in the system will cause | damping of the waveform
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| if you select a scale that's too small: | the waveform will get chopped off/ go off the chart
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| If you tell the computer you are recording PC wedge : | it will look for an A wave, V wave and mean
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| What is the most accurate form of hemodynamic waveform measurement? | paper recording with simultaneous ECG and waveform
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| Tue or False: Dead ender caps should be left on during Zeroing | False, it would result in overshoot, no air equals increased pressure
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| It is possible to obtain both CVP and PA/PCW pressures using one transducer without breaking the system by using a: | male to male adapter (blue port and yellow port on Swan)
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| Respiratory variation is a significant factor monitoring which waveform? | PCW
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| The formula for determining the calibration factor for hand calculating pressure waveforms is: | mm of pressure scale / mm of paper
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| The zeroing port of the stopcock should be at the level of the | tip of the monitoring catheter
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| A scale commonly used in monitoring femoral arterial pressure is: | 200 mmHg
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| A scale commonly used in monitoring right heart pressures is: | 40 mmHg
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| Phasic pressure is | instantaneous changes
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| It is possible to eliminate catheter whip artifact in a hemodynamic waveform by using a: | band pass filter (measured in Hz)
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| What kind of tube connecting a fluid filled catheter to the pressure transducer would have the poorest frequency response? | long, soft, small in diameter
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| What kind of tube connecting a fluid filled catheter to the pressure transducer would have the highest frequency response? | long, stiff, large in diameter
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