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Measurement of Tissue Oxygenation Using Near-Infrared Spectroscopy in Patients Undergoing Hemodialysis
Published on: October 2, 2020
Haemodialysis is associated with a pronounced fall in myocardial perfusion
Judith J Dasselaar1, Riemer H J A Slart, Martine Knip
1Dialysis Center Groningen, University Medical Center Groningen, Groningen, The Netherlands.
Insights
Haemodialysis significantly reduces myocardial blood flow (MBF) and left ventricular (LV) function, even early in the procedure. These reductions in MBF during haemodialysis may contribute to the elevated cardiac risk observed in dialysis patients.
Area of Science:
- Cardiology
- Nephrology
- Nuclear Medicine
Background:
- Haemodialysis (HD) is essential for renal replacement therapy but is linked to increased cardiac risk and sudden death in patients.
- Accumulating evidence suggests the HD procedure itself can induce myocardial ischemia.
Purpose of the Study:
- To evaluate the impact of HD on global and regional myocardial blood flow (MBF) and left ventricular (LV) function.
- To assess these effects in non-diabetic patients without pre-existing cardiac compromise.
Main Methods:
- Utilized (13)N-ammonia positron emission tomography (PET) to quantify MBF, LV wall motion, cardiac output (CO), LV end-diastolic volume (LVEDV), and LV end-systolic volume (LVESV).
- PET scans were conducted before and at 30 and 220 minutes during HD in seven patients.
Main Results:
- Global MBF decreased significantly during HD, falling by 13.5% at 30 minutes and 26.6% at 220 minutes (after ultrafiltration).
- LV volumes (LVEDV, LVESV) and CO also showed significant reductions during HD.
- New LV regional wall motion abnormalities (RWMA) developed in two patients, correlating with greater MBF reduction in affected regions.
Conclusions:
- Haemodialysis induces a substantial and early reduction in MBF.
- Factors beyond hypovolemia, such as acute dialysis-associated elements, contribute to decreased MBF.
- Reduced MBF during HD may be a significant factor in the high cardiac event rate among dialysis patients.
Background:
Whereas haemodialysis (HD) is lifesaving by replacement of renal function, there are data to suggest that the HD procedure itself may contribute to the high cardiac risk in dialysis patients. The HD procedure is associated with an increased risk of sudden death, and there is accumulating evidence that HD can elicit myocardial ischaemia. In this study, we evaluated the effect of HD on global and regional myocardial blood flow (MBF) and left ventricular (LV) function in non-diabetic, non-cardiac compromised patients.
Methods:
(13)N-NH(3) positron emission tomography (PET) was used to quantify changes in MBF, LV wall motion, cardiac output (CO), LV end-diastolic volume (LVEDV) and end-systolic volume (LVESV) in seven non-diabetic patients with uneventful cardiac histories. PET scans were performed before and at 30 and 220 min of HD.
Results:
In all patients global MBF fell during HD. At 30 min of HD without ultrafiltration (UF), global MBF had fallen 13.5 +/- 11.5% (P < 0.05) while CO, LVEDV and LVESV were 4.6 +/- 5.3% (NS), 5.6 +/- 4.2% (P < 0.05) and 6.9 +/- 7.2% (P < 0.05) lower, respectively. At 220 min of HD, after UF of 2.5 +/- 0.9 l, global MBF had fallen 26.6 +/- 13.9% (P < 0.05) from baseline while CO, LVEDV and LVESV were 21.0 +/- 19.7%, 31.1 +/- 12.7% and 36.4 +/- 17.5% (all P < 0.05) lower, respectively. In two patients, new LV regional wall motion abnormalities (RWMA) developed at 220 min of HD. MBF was reduced to a greater extent in regions that developed LV RWMA compared to those that did not.
Conclusions:
Haemodialysis induced a pronounced fall in MBF. Since MBF fell already early during HD not only hypovolaemia but also acute dialysis-associated factors seem to play a role. Haemodialysis-associated reductions in MBF may contribute to the high cardiac event rate of dialysis patients.
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