Key Terms: Exam 2 Flashcards
What are basic functions of piezoelectric crystals TEE
To send and receive Sound waves
What properties of TEE corrects the signal lost from distant tissue beds
?
Time gain compensation
Describe the Doppler effect
When sound moves toward you, wavelengths shorten, thus frequency increases and pitch increases
vice versa as it moves away from you (Wavelength lengthens, thus frequency decreases and pitch decreases)
Pulsed wave (gated) Doppler is used to detect what
Blood flow velocities through the pulmonary veins and mitral valve and in the low flow areas within the heart
Know which letters indicate what on pacemaker nomenclature
.
What is the technique of injecting tiny gas bubbles into the bloodstream in order to acquire better ultrasound imaging
Contrast echocardiography
What are the effects of increasing the frequency of an ultrasound signal
Increased frequency = increase resolution , but less penetration
Decrease frequency= decreased resolution, but deeper penetration
Know the waveform appearances when the Swan-Ganz catheter inserted At a given depth, in cm, into the chambers and vessels
.
What ultrasound property diminishes with distance from the sound source
Amplitude
What property of a TEE does a phased array provide
Focal point
What is the M in M-mode TEE stand for
Motion – it assesses function of rapidly moving parts the heart
What are the uses of transgastric angle of TEE
LV function
What is true of continuous wave Doppler
Measures high velocity but does not precisely identify their location
What is the speed of sound in the ear
1540 m/s
Be able to recognize as well as list uses of Swan-Ganz port
.
