Question
Characteristics of venous blood flow?
| A. | Monophasic |
| B. |
Biphasic |
| C. |
Triphasic |
| D. |
Non phasic |
Show Answer
|
Correct Answer � A Explanation |
 |
Ans: A. Monophasic
1. 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)
2. Biphasic: having two phases or variations having forward and reverse flow
- systolic forward flow
- either of the following (controversial):
a. diastolic flow reversal without late diastolic forward flow (more common)
b. zero diastolic flow reversal and pandiastolic forward flow (slower than in systole)
3. Monophasic: having one phase
- systolic forward flow continuing into diastole, lacking reverse diastolic flow, which can be divided by acceleration/deceleration time:
a. sharp: fast systolic rise and fast diastolic fall
b. blunted: the slow systolic rise and slow diastolic fall
