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KMID : 0359920060250060941
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Korean Journal of Nephrology
2006 Volume.25 No. 6 p.941 ~ p.949
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Change of CAVI in Maintenance Hemodialysis Patients
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Lee Tae-Woo
Kang Eung-Taeck
Shin Jin-Hee
Yu Soo-Jung
Oh Dong-Jin
Yu Suk-Hee
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Abstract
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Background : CAVI, Cardio Ankle Vascular Index, has been proposed as an independent marker of arterial stiffness regardless of the blood pressure. We measured the CAVI of hemodynamically unstable patients on maintenance hemodialysis and at the same time measured other pulse pressure-related parameters in order to study their correlations with each other.
Methods : We studied 85 patients undergoing maintenance hemodialysis over 3 months. We categorized patients into 4 subgroups: Diabetes Hypotension ＋ (N= 12), Diabetes＋Normal blood pressure (N=16), Non- diabetes＋Hypotension (N=15), and Non-diabetes＋ Normal blood pressure (N=42). Using automatic waveform analyzer, we measured CAVI and pulse pressurerelated markers twice, before and after the hemodialysis session, and observed the change.
Results : After the dialysis, CAVI did not change despite the decreased mean blood pressure. Yet both brachial and ankle pulse pressure dropped significantly (4.34±15.22 mmHg, 11.50±20.65 mmHg, p<0.01). PEP (Pre-Ejection Period) on the other hand, remarkably increased (12. 13±22.18 msec) while ET (Ejection Time) showed considerable decrease (35.86 ±45.68 msec), and PEP/ ET ratio increased as well. Predialysis CAVI was significantly higher in Diabetes group than in Non-diabetes (11.02±2.33 vs. 8.20±1.87, p<0.001). However, no significant difference of CAVI was observed between Hypotension and Normal blood pressure groups. Diabetes＋Hypotension Group displayed reduction in CAVI after dialysis with marginal significance (0.68±1.07, p=0.05) whilst PEP, ET and PEP/ET ratio showed no significant change compared to other groups.
Conclusion : CAVI, a newly developed marker of arterial stiffness, is expected to be useful in prediction of the cardio-vascular risk and prognosis of patients undergoing hemodialysis. (Korean J Nephrol 2006; 25(6):941-949)
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KEYWORD
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Cardio Ankle Vascular Index, Arterial stiffness, Hemodialysis
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