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The potential effect of cardiac function on pulmonary hypertension, other risk factors, and its impact on survival in dialysis patients

  • Nephrology - Original Paper
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Abstract

Introduction

Pulmonary hypertension (PH) is a recently recognized as a complication of chronic kidney disease and end-stage renal disease. The pathogenesis of pulmonary hypertension in this group of patients is not fully understood, probably due to the interaction of multiple aspects of the altered cardiovascular physiology and also hormonal and metabolic disorders. The present study aimed to determine the prevalence of PH, correlation with cardiac function and other risk factors and its impact of survival in chronic hemodialysis and peritoneal dialysis patients.

Methods

We studied 125 stable hemodialysis and peritoneal patients (females 40%, mean age 52.42 ± 11.88 years) on renal replacement therapy (RRT) for more than 3 months with a follow up 2 years. Demographic information, clinical characteristics, blood test, and thoroughly echocardiographic evaluation at the optimal dry weight were collected. After conventional echocardiographic examination, tissue Doppler echocardiographic (TDE) examination was performed to evaluate global and regional myocardial systolic as well as diastolic function, and pulmonary hypertension. PH was defined as systolic pulmonary artery pressure (sPAP) ≥ 35 mmHg. To rule out secondary PH, patients with pulmonary disease, collagen vascular disease, and volume overload at the time of echocardiography were excluded. Variables were compared between two groups—subjects with PH and non-PH. Logistic regression analysis was used to evaluate the risk factor for PH and its impact on survival.

Results

According to the echocardiographic findings, PH was found in 28% (35 patients) of all patients. Mean PH was 33.46 ± 5.38 mmHg. The higher level of higher parathormone (PTH), C-reactive protein (CRP) and E/E’ average, lower left ventricular ejection fraction (EF), peak systolic velocity at the lateral mitral annulus (MASa) and the peak systolic velocity at the lateral tricuspid annulus (TASa) were found predictor of PH. The cardiovascular mortality rate was 15.5%. Patients evaluated with PH have a significantly lower cardiovascular survival rate [Long Rank (Mantel–Cox) p = 0.0001]. In ROC analysis for CV mortality, the area under the curve (AUC) for PH and CRP was found 0.8; for LVM-I, E/E’ and PP, AUC = 0.76; 0.75; 0.72 respectively while the inverse relationship was found with MASa and TASa with AUC = 0.66 and 0.95 respectively.

Conclusion

Our study shows that PH is frequent in dialysis patients. It is influenced by inflammation, CKD-MBD biomarkers associated with diastolic and also systolic left and right ventricle dysfunction. Pulmonary hypertension, inflammation, vascular stiffness, and left ventricular hypertrophy are interrelated and all contribute to cardiovascular morbidity and mortality among dialysis patients. Easy to implement, cardiac imaging at the bedside and in outpatient clinics offers a positive perspective in early diagnosis of cardiac abnormalities and immediate approach to this condition, so is highly recommended in the dialysis population.

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Acknowledgement

We would like to thank you Dr. Ilir Akshija for the help done with statistic analysis.

Funding

This study was not funded by any grant.

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Author notes

  1. Merita Rroji and Majlinda Cafka contributed equally in the manuscript.

Authors and Affiliations

  1. Department of Nephrology, University Hospital Center “Mother Tereza”, Tirana, Albania

    Merita Rroji, Saimir Seferi & Myftar Barbullushi

  2. Department of Cardiology, University Hospital Center “Mother Tereza”, Tirana, Albania

    Majlinda Cafka, Joana Seiti & Artan Goda

Authors
  1. Merita Rroji
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  2. Majlinda Cafka
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  3. Saimir Seferi
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Correspondence to Merita Rroji.

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This was an observational study and all the investigation was under the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.

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Rroji, M., Cafka, M., Seferi, S. et al. The potential effect of cardiac function on pulmonary hypertension, other risk factors, and its impact on survival in dialysis patients. Int Urol Nephrol 53, 343–351 (2021). https://doi.org/10.1007/s11255-020-02655-z

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