What is a high resistance waveform?
A high-resistance waveform is characterized by rapid systolic upstroke (straight arrow), low flow velocities, or no flow, during diastole (curved arrow), and, commonly, reversal of flow direction (arrowhead) in early diastole. This Doppler spectrum was obtained from the common femoral artery.
What is Tardus Parvus waveform?
Tardus parvus refers to a pattern of Doppler ultrasound spectral waveform resulting from arterial stenosis. The phenomenon is observed downstream to the site of stenosis, and is due to reduced magnitude of blood flow through the narrowed vessel during ventricular systole 7.
What does multiphasic waveform mean?
Multiphasic waveforms cross the zero-flow baseline and contain both forward and reverse velocity components. Monophasic waveforms do not cross the zero-flow baseline and reflect blood which flows in a single direction for the duration of the cardiac cycle.
What does triphasic waveform mean?
triphasic: having three phases, due to crossing the zero flow baseline twice in each cardiac cycle. systolic forward flow. early diastolic flow reversal (below zero velocity baseline) late diastolic forward flow (slower than in systole)
What does a high resistance flow pattern in the internal carotid artery indicate?
In the proximal common carotid artery waveform, a higher resistive or hybrid type signal may be seen, but the distal common carotid artery waveform should have a low-resistance pattern. Important hemodynamic information from the common carotid artery may indicate proximal or distal disease.
What is high resistance blood flow?
Impaired uterine blood flow is generally considered a chronic phenomenon, predominantly due to failure of invasion of the placenta by the trophoblast in early pregnancy,22 and abnormal patterns, either high resistance indexes or notching, are predictive of pre-eclampsia and intrauterine growth retardation.
What does monophasic waveform mean?
Monophasic: single phase—forward flow with no. reverse flow component. • Other: waveform considered neither triphasic, biphasic, nor. monophasic or a waveform that could not be categorized.
What causes Pulsus Parvus et Tardus?
What causes pulsus parvus et tardus? Pulsus parvus et tardus usually indicates aortic valve stenosis, which is most commonly caused by aging. As people age, damage to the heart may occur and lead to scar tissue formation around the valve.
What does monophasic waveform indicate?
The waveform should be triphasic, corresponding to the three phases of a heart beat (systole, diastole, elastic recoil). Biphasic waveform indicates mild to moderate disease and monophasic flow indicates significant disease.
What is a monophasic waveform?
What is spectral waveform?
The spectral Doppler power waveform contains an immense amount of hemodynamic information from the sampled circulation. Spectral frequency reflects the speed of blood flow. The ampli- tude approximately represents the number of scat- terers traveling at a given speed and is also known as the power of the spectrum.
What is biphasic and triphasic?
Biphasic pills provide in succession 2 estrogen-progestagen combinations in increasing doses. Triphasic pills provide a continuous dose of estrogen combined with a progressively increased dose of progestagen from week to week.