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Myocardial contractility does not determine the haemodynamic response during dialysis
Eric H Y Ie1, Rob Krams, Wim B Vletter
1Department of Medicine, Erasmus MC, Dr Molewaterplein 40, 3015 GD Rotterdam, the Netherlands. e.ie@erasmusmc.nl
Summary
Dialysis hypotension is not caused by reduced myocardial contractility. End-systolic elastance (Ees), a measure of heart muscle function, was similar in hypotension-prone and resistant dialysis patients.
Area of Science:
- Cardiology
- Nephrology
- Physiology
Background:
- Dialysis-induced hypotension is a common complication.
- Left ventricular (LV) systolic dysfunction has been suggested as a cause.
- End-systolic elastance (Ees) assesses myocardial contractility.
Purpose of the Study:
- To evaluate myocardial contractility using Ees in dialysis patients prone (HP) versus resistant (HR) to hypotension.
- To determine if impaired contractility contributes to intradialytic hypotension.
Main Methods:
- Assessed Ees by measuring LV response to nitroglycerine (NTG) in 15 dialysis patients.
- Used Finapres for continuous arterial pressure and automated border detection for LV area.
- Calculated Ees from real-time pressure-area loops.
Main Results:
- Systolic blood pressure decreased significantly post-NTG in both groups.
- End-systolic LV area also decreased after NTG.
- Ees was similar between HP (11 mmHg cm(-2)) and HR (9 mmHg cm(-2)) groups.
- Ejection fraction (EF) showed no correlation with Ees.
Conclusions:
- Dialysis patients prone to hypotension do not exhibit reduced myocardial contractility compared to resistant patients.
- These findings suggest that impaired contractility is not a primary cause of intradialytic hypotension.