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Electronics of Hemod

Electronics of Hemodynamics Quiz prep for 1-16-16

Cap. = Capacitor Stores energy in farads ex: defibrillator
Bat. = Battery (DC storage device)
Gnd. = Ground (zero voltage, ABSORBS charge)
Diode = Directs current flow in one direction only (changes AC to DC), looks like arrow
Res. = Resistor (inhibits flow of electrons) medical devices and appliances are resistors, force electricity to do work ; represents workload
Induct. = Inductance coil; Transformer; Inductor- stores or converts magnetic flux, think of a coil; boosts current to power x-ray equipment, MRI
DC Power does what: defibrillates- direct current
AC power does what: fibrillates - 120 V; 60sec/cyc
What kind of power is found in pacemakers DC power and parallel circuit
The strain gauge converts fluid pressure to an electrical signal using: variable resistors
Two pressure channels are required to record Simultaneous pressures
Calibration assures: Proper baseline and top pf scale for all channels
Adjusting the band pass filter to reduce "noise", you change Hz (frequency filter)
A 40mm scale is commonly used for: Right heart pressures
When using standard disposable transducers with fluid filled catheters, where is the "Wheatstone Bridge" located? In the: Transducer
The electrical signal is converted into a waveform on the screen by a process called: Modulation-demodulization
What is the modem responsible for Modulation-demodulization
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)
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
The phlebostatic axis refers to the: Mid-axillary line
Phlebostatic axis? central venous collection of blood - midaxillary, right armpit
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
Temperature drift of a pressure transducer should be corrected periodically by: opening to air, and pressing the zero button
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
How do you calculate a patients fundamental frequency? bpm divided by 60= beats per second
How do you find the tenth harmonic of a patients fundamental frequency? multiply fundamental frequency by 10
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
Performing the fast flush "Square Wave Test" is for the purpose of: Testing for optimal damping
What is a synonym for zeroing? balancing
How do you confirm the zero baseline? by opening to air
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
Air in the system will cause damping of the waveform
if you select a scale that's too small: the waveform will get chopped off/ go off the chart
If you tell the computer you are recording PC wedge : it will look for an A wave, V wave and mean
What is the most accurate form of hemodynamic waveform measurement? paper recording with simultaneous ECG and waveform
Tue or False: Dead ender caps should be left on during Zeroing False, it would result in overshoot, no air equals increased pressure
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)
Respiratory variation is a significant factor monitoring which waveform? PCW
The formula for determining the calibration factor for hand calculating pressure waveforms is: mm of pressure scale / mm of paper
The zeroing port of the stopcock should be at the level of the tip of the monitoring catheter
A scale commonly used in monitoring femoral arterial pressure is: 200 mmHg
A scale commonly used in monitoring right heart pressures is: 40 mmHg
Phasic pressure is instantaneous changes
It is possible to eliminate catheter whip artifact in a hemodynamic waveform by using a: band pass filter (measured in Hz)
What kind of tube connecting a fluid filled catheter to the pressure transducer would have the poorest frequency response? long, soft, small in diameter
What kind of tube connecting a fluid filled catheter to the pressure transducer would have the highest frequency response? long, stiff, large in diameter
Created by: ICVT2b