What does biphasic flow mean?

biphasic: having two phases or variations having forward and reverse flow 5. systolic forward flow. either of the following (controversial): diastolic flow reversal without late diastolic forward flow (more common)

What is spontaneous flow?

adj. 1 occurring, produced, or performed through natural processes without external influence.

What is Respirophasic flow?

Throughout the periphery, flow velocities vary with respiration due to the changes in intrathoracic and intra-abdominal pressures and are aptly called respirophasic. These patterns of respiratory varia- tions in flow velocity can become suspended, severely dampened, or absent with shallow breathing or breath holding.

What is monophasic biphasic and triphasic pulse?

PHASICITY. Multiphasic. Previous alternate terms: triphasic; biphasic Waveform crosses the zero-flow baseline and contains both forward and reverse velocity components. Monophasic. Waveform does not cross the zero-flow baseline throughout any part of the cardiac cycle; blood flows in a single direction.

What is biphasic and triphasic flow?

Triphasic: three phases—forward flow, flow reversal, and a second forward component. • Biphasic: two phases—one forward flow and one reverse. component.

Is flow of heat a spontaneous process?

Spontaneous Reactions Let’s consider a familiar example of spontaneous change. If a hot frying pan that has just been removed from the stove is allowed to come into contact with a cooler object, such as cold water in a sink, heat will flow from the hotter object to the cooler one, in this case usually releasing steam.

What is normal hepatic artery flow?

The hepatic artery is a low-resistance vessel; however, wider normal ranges of 0.55–0.81 have been reported for this vessel (12–14). Any measured RI above or below the normal range may represent disease. High-resistance arteries physiologically have an RI greater than 0.7; any RI lower than this may represent disease.

What is triphasic flow in Doppler?

The normal (“triphasic”) Doppler velocity waveform is made up of three components which correspond to different phases of arterial flow: rapid antegrade flow reaching a peak during systole, transient reversal of flow during early diastole, and slow antegrade flow during late diastole.

What is spontaneous and non-spontaneous?

A spontaneous process is one that occurs naturally under certain conditions. A nonspontaneous process, on the other hand, will not take place unless it is “driven” by the continual input of energy from an external source.

What is the difference between entropy and spontaneity?

The best indicator of spontaneity in a reaction is the change in Entropy (S or DS). The Second Law of Thermodynamics states that for a reaction to be spontaneous, there must be an increase in entropy. Entropy is often defined as a measure of the disorder of a system, this is not a very accurate definition.

What is descending venography?

Descending venography is the definitive test for the differential diagnosis between primary valve incompetence (PVI), postthrombotic (secondary) valve incompetence (SVI), and valve aplasia in patients with an incompetent deep venous system.

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