Background. In clinical practice, the glomerular filtration rate (GFR) is often estimated by the Modification of Diet in Renal Disease (MDRD) or Cockcroft-Gault (CG) formulae. No data are available, however, on the performance of these formulae in Arab individuals. Methods. Plasma creatinine samples were obtained from 90 consecutive normal Arab kidney donors for the estimation of GFR (eGFR) using the simplified MDRD and CG formulae. The GFR was measured in these donors with chromium labelled EDTA {[51Cr] EDTA). Bias was assessed by calculating the difference between the measured GFR and the calculated GFR using each of the two formulae; precision was calculated using the r value of the regression analysis. Results. The group studied consisted of 90 donors, of whom 64 were males (71%). The mean age was 30.8 years (± 9.8) and mean BMI was 25.7 (± 5.7). The measured GFR (mean 112.4 ± 17.5) correlated better with the calculated GFR by CG formula (mean 107.7 ± 29.7) and showed poor correlation with the GFR estimated by the MDRD (mean 89.2 ± 13.8); bias = 4.8 and 23.3, respectively (p = 0.1 and < 0.0001, respectively). The correlation with CG formula was better in males (bias = 2, p = 0.5) and those under 30 years of age (bias = 1.0, p = 0.9). Based on our data, we calculated a correction factor to the CG formula to improve the correlation with the measured GFR in Arab individuals. By multiplying the CG formula by 1.0446, the bias was reduced from 4.8 (p = 0.1) to 0.0 (p = 0.5) with an increase in precision from 0.2 (p = 0.05) to 0.43 (p = 0.0001). Using CG formula, the frequency for values within 30% of the mean of the measured value was 75%, which improved to 80% using the revised formula. Conclusions. CG formula was found to be the most appropriate for calculation of GFR in Arab individuals. It is possible to reduce the bias and improve precision in Arab individuals with normal renal function by multiplying the result obtained by CG formula by 1.0446.
Background
The prognosis of the novel coronavirus disease 2019 (COVID-19) may be poor in patients with end-stage kidney disease (ESKD). Limited information is available on the clinical characteristics and outcomes of such patients in Arab countries. The present study aimed to address this gap.
Methods
This retrospective cohort study included 101 patients with ESKD who were hospitalized for COVID-19 between May 1, 2020 and December 31, 2020 at King Fahad Central Hospital (single center), Jazan Province, Saudi Arabia. Chi-square test, independent samples
t
-test, Mann–Whitney
U
-test, and Cox regression were performed in the statistical analysis.
Results
Of the 101 hospitalized COVID-19 patients with ESKD, 20 patients died (19.8%). Patients aged ≥ 65 years had a significant mortality risk. Mortality was higher in male patients (70%) than in female patients (30%). The most common comorbidities were hypertension (88%), diabetes mellitus (47%), and heart disease (17%). The presence of diabetes and cardiovascular diseases along with ESKD increased the mortality risk [relative risk (RR) = 6.5 and RR = 3.8, respectively]. The most frequently reported clinical symptoms were fever (50%), shortness of breath (41%), and cough (35%). In total, 17% of the patients were admitted to the intensive care unit and required mechanical ventilation. Most patients had bilateral lung infiltrates (88%). Hemoglobin levels and platelet counts were significantly lower in the deceased patients than in the surviving ones. Moreover, compared with the surviving patients, higher degree of lymphocytopenia, neutrophilia, ferritin, D-dimer, blood urea nitrogen, and aspartate transaminase were detected in the deceased patients. Septic shock (20%) and respiratory failure (19%) were the most prevalent complications resulting in death.
Conclusion
COVID-19 patients with ESKD have an increased risk of poor outcomes and mortality. The mortality risk increases with an increase in age and the presence of other comorbidities, such as diabetes and cardiovascular disease. Elevated levels of inflammatory markers correlate with disease severity and are associated with in-hospital mortality in this population.
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