Related Experiment Videos
Left ventricular function in terminal uremia. A hemodynamic and echocardiographic study
Insights
Advanced uremia patients maintain normal cardiac index (CI) and stroke work index (SWI) despite retention of guanidines, acidosis, and hypocalcemia. Left ventricular filling pressure (LVFP) is mainly affected by volume and ventricular distensibility.
Area of Science:
- Nephrology
- Cardiology
- Internal Medicine
Background:
- Advanced uremia is associated with cardiovascular complications.
- Uremic toxins and metabolic derangements may impact cardiac function.
- Left ventricular performance in uremia requires further investigation.
Purpose of the Study:
- To assess left ventricular performance in patients with advanced uremia.
- To determine factors influencing left ventricular filling pressure (LVFP) in uremic subjects.
- To correlate cardiac index (CI) and stroke work index (SWI) with LVFP variations.
Main Methods:
- Studied 14 patients with advanced uremia.
- Measured cardiac index (CI), stroke work index (SWI), and left ventricular filling pressure (LVFP).
- Correlated CI and SWI with LVFP during peritoneal dialysis and afterload reduction.
Main Results:
- Patients exhibited high CI and SWI despite uremic toxins, acidosis, and hypocalcemia.
- CI was high at normal LVFP, decreasing at low or high LVFP.
- Left ventricular hypertrophy and pericardial effusion were common, potentially affecting ventricular distensibility.
Conclusions:
- Uremic patients can maintain normal cardiac index and stroke work index.
- Left ventricular filling pressure in uremia is primarily influenced by volume loads and ventricular distensibility.
- Cardiovascular function in advanced uremia is complex and multifactorial.
Abstract:
14 patients with advanced uremia had a mean cardiac index (CI) of 4.37 +/- 0.25 liters/min/m2, a mean stroke work index (SWI) of 65.6 +/- 3.7 g/m/m2 and a mean left ventricular filling pressure (LVFP) of 16.3 +/- 2.1 mm Hg. The left ventricular performance was estimated to be normal when CI or SWI changes were correlated with simultaneous variation of the LVFP attained during peritoneal dialysis or afterload reduction. CI was high at a normal LVFP, it decreased at low or high LVFP. Guanidines retention, metabolic acidosis and hypocalcemia did not prevent the maintenance of a high CI or SWI. Out of 32 patients, left ventricular hypertrophy and pericardial effusion, conditions which may affect ventricular distensibility, were present in 25 and in 22 echocardiograms, respectively. We suggest that in uremic subjects, LVFP is primarily influenced by volume loads and by ventricular distensibility modifications.