Related Experiment Videos
Vascular response to vasoactive agents in dialysed patients with chronic renal failure with and without diabetes
Abstract:
Using a muscle bath technique the vascular response to KCl, noradrenaline, angiotensin II, acetylcholine, and sodium nitroprusside were evaluated in 13 patients with diabetes mellitus (DM group) and 15 nondiabetic (non-DM group) chronic renal failure patients treated with haemodialysis. There were no differences in age, duration of haemodialysis, blood pressure and the levels of plasma renin activity, noradrenaline, and parathyroid hormone between groups. After informed consent was obtained, a small piece of forearm vein was resected during the blood access surgery. The ring preparation of the blood vessel was sustained in the muscle bath filled with Krebs-Henseleit solution and the isometric tension development was recorded. All drugs produced concentration dependent responses in the ring preparations of both groups. Although there were no significant differences in Emax values for KCl- and angiotensin-II-induced contractions between groups, the value for noradrenaline in the DM group was significantly less than that in the non-DM group. Sodium nitroprusside completely relaxed the ring preparation precontracted by 10(-5) M noradrenaline. However, the response to acetylcholine in the DM group was significantly weaker than that in the non-DM group. These results suggest a reduced vascular response to noradrenaline and acetylcholine in dialysed diabetic renal failure patients, which may relate to the autonomic nervous system dysfunction.
Insights
Diabetic patients on dialysis show reduced vascular responses to noradrenaline and acetylcholine, potentially linked to autonomic dysfunction. This study investigated vascular reactivity in chronic renal failure patients with and without diabetes mellitus.
Area of Science:
- Vascular biology
- Nephrology
- Endocrinology
Background:
- Chronic renal failure (CRF) patients often have comorbidities like diabetes mellitus (DM).
- Vascular complications are common in CRF, particularly in diabetic patients undergoing hemodialysis.
- Autonomic nervous system dysfunction is a known complication of both DM and CRF.
Purpose of the Study:
- To compare vascular reactivity to various vasoactive agents in hemodialysis patients with and without diabetes mellitus.
- To investigate potential differences in the response to noradrenaline and acetylcholine between diabetic and non-diabetic CRF patients.
- To explore the relationship between vascular dysfunction and autonomic nervous system function in this patient population.
Main Methods:
- A muscle bath technique was employed to assess vascular responses in forearm vein preparations.
- Isometric tension development was recorded in response to cumulative concentrations of KCl, noradrenaline, angiotensin II, acetylcholine, and sodium nitroprusside.
- Patient groups included 13 diabetic (DM) and 15 non-diabetic (non-DM) chronic renal failure patients undergoing hemodialysis.
Main Results:
- Vascular responses to KCl and angiotensin II were similar between DM and non-DM groups.
- A significantly reduced contractile response to noradrenaline was observed in the DM group compared to the non-DM group.
- The vasodilatory response to sodium nitroprusside was complete in both groups, but acetylcholine-induced relaxation was significantly weaker in the DM group.
Conclusions:
- Dialyzed diabetic renal failure patients exhibit diminished vascular reactivity to noradrenaline and acetylcholine.
- These findings suggest impaired vascular function in diabetic CRF patients, possibly related to autonomic nervous system dysfunction.
- Further research is warranted to elucidate the mechanisms underlying these vascular alterations and their clinical implications.