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Continuous color -mapping image of AVF pulse wave for one cycle (2.600 to 3.360 s, the band pass filter was applied). (a) Anastomotic tense phase (2.820 s). (b) Transition from anastomosis to puncture site (3.000 s). (c) Peak puncture site phase (3.125 s). (d) Anastomotic relaxation phase (3.150 s). (e) End of anastomotic relaxation phase (3.325 s).
