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Pattern, frequency and factors associated with inappropriate high dosing in chronic kidney disease patients at a tertiary care hospital in Pakistan

BMC Nephrology volume 24, Article number: 118 (2023) Cite this article

Abstract

Background

Patients with chronic kidney diseases (CKD) are susceptible to the toxic drug effects if given unadjusted doses. Although Pakistan harbors a high burden of CKD patients, there is limited information available on the frequency, pattern and factors associated with unadjusted drug doses among CKD patients.

Methods

This cross-sectional study conducted at Sandeman Provincial Hospital, Quetta included 303 non-dialysis ambulatory CKD patients (glomerular filtration rate < 60 ml/min/1.73m2). The patients’ data were collected through a purpose designed data collection form. The appropriateness of doses was checked against the renal drug handbook-2018, Kidney Disease Improving Global Outcomes guidelines, British National Formulary-2022, and manufacturer leaflets. Data were analysed by SPSS 23 and multiple binary logistic regression analysis was used to assess the factors associated with receiving inappropriate high doses. A p-value < 0.05 was considered statistically significant.

Results

The patients received a total of 2265 prescription lines, with a median of eight different drugs per patient (interquartile range: 6–9 drugs). A total of 34.5% (783/2265) drugs required dose adjustment. Of these, doses were not adjusted for 56.1% (440) drugs in 162 (53.4%) patients. The most common pharmacological class of drugs requiring dose adjustment were antibiotics (79.1%), followed by antidiabetics (59.2%), diuretics (57.0%), angiotensin converting enzyme inhibitors (56.9%), beta blockers (56.9%), analgesics (56.0%), angiotensin receptor blockers (55.2%), domperidone (53.9%) and antihyperlipidmics (46.1%). Patient’s age of 41–60 (OR = 5.76) and > 60 years (OR = 9.49), hypertension (OR = 2.68), diabetes mellitus (OR = 3.47) and cardiovascular diseases (OR = 2.82) had statistically significant association (p-value < 0.05) with inappropriate high doses.

Conclusion

The high frequency of inappropriate high doses suggests an important quality gap in medication dosing for patients with ND-CKD at the study site. Special attention should be paid to the drugs and patients with identified risk factors for receiving inappropriate high doses.

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Background

Chronic kidney disease (CKD) is characterized by a persistently low estimated glomerular filtration rate (eGFR) of less than 60 ml/min/1.73m2, typically present for more than three months [1, 2]. Due to reduced elimination of drugs and their metabolites in patients with CKD, there is an increased risk of potential toxicity and increased healthcare costs [3,4,5]. Patients with CKD often have multiple comorbidities and are prescribed various medications requiring dose adjustment, therefore, it is recommended to adjust the drug dosage based on the patient’s renal function [6]. Despite this recommendation, the research indicates that clinicians find it challenging to perform this dose adjustment. According to various published studies, the frequency of CKD patients receiving the inappropriate high doses reportedly ranges from 13 to 84.3% [7,8,9,10,11]. Independent variables commonly found to be associated with the reception of inappropriate high doses by CKD patients include CKD stage 4 & 5, polypharmacy, comorbidities and patients over 65 years of age [10,11,12]. By evaluating the dosage regimen and factors associated with inappropriate high doses among CKD patients, insights can be gained into the extent of the problem and the patients groups who are at high risk. The data from such studies can be used to design targeted interventions aimed at improving clinical practices, patient outcomes, and reduce healthcare costs associated with inappropriate dosing [13, 14].

Pakistan is the world’s sixth most populated country and harbors a high burden of CKD patients. A press talk by a nephrologist at Sheikh Zayed Hospital Lahore [15] and findings of a systematic review [16], suggest that over 20% of the country’s population suffers from CKD [17]. Despite this high prevalence of CKD patients, very little information is currently available from Pakistan about the frequency, the related factors, and drugs involved in inappropriate high dosing among CKD patients [10, 18]. Consequently, the purpose of this study was to address these gaps.

Methods

Study settings and design

The present study is a cross-sectional analytical study conducted at the nephrology outpatient department (OPD) of Sandeman Provincial Hospital (SPH) in Quetta, Balochistan. SPH is a large tertiary care hospital in the province, consisting of 800 beds and serving approximately 8000–10,000 patients daily [19, 20].

Study patients

This study included established non-dialysis CKD (ND-CKD) patients who were at least 18 years old, suffered from CKD stage 3 and above, visited the nephrology OPD of SPH between November 1, 2020 and January 31, 2021 and were willing to participate in the study by giving written or oral consent (in case of uneducated patients). Patients with eGFR ≥ 60 ml/min/1.73m2, those undergoing haemodialysis, pregnant women and who had a history of renal transplant were excluded from the study. In order to avoid missing any patient with renal impairment, we used eGFR rather than serum creatinine cut off points for defining renal impairment. The eGFR of patients was calculated by using CKD-epi Eqs. [21, 22] and the eligible patients were categorized into CKD stage 3a (eGFR = 45–59 ml/min/1.73 m2), stage 3b (eGFR = 30–44 ml/min/1.73 m2), stage 4 (15–29 ml/min/1.73 m2) and stage 5 (< 15 ml/min/1.73 m2) [23].

To determine the minimum sample size for this study, we employed the Daniel’s sample size calculation formula (n = Z2P (1 − P)/d2) [25], where n = required sample size, Z = Z-statistics for a level of confidence (for 95% level of confidence, Z = 1.96), P = expected prevalence in population based on previous published studies [in proportion of 1, so, the estimated frequency of inappropriate high dosing in CKD patients was 74.0% or 0.74 [11], d = absolute error or precision (in proportion of 1, if 5%, d = 0.05). By putting these values in the abovementioned formula, the minimum number of patients required for this study was 295.

Data collection and identification of medication dosing errors

To collect patients’ data, a standardized data collection form devised on the basis of extensive literature review and inputs from the clinical team at the study site and supervisory committee was used. The patients’ files, medication prescriptions and laboratory findings were used to gather the data. The data collected consisted of patient’s age, gender, weight, serum creatinine, stages of CKD, comorbidities, serum electrolytes and prescribed medications along with dose and frequency. Additionally, the number of prescribed medications lines and their generic names were recorded, and they were categorized according to their respective pharmacological classes [17, 24]. Since no national drug dosing guidelines for CKD exists in Pakistan, the appropriateness of medication doses was checked against various resources including renal drug handbook- 2018 [25], Kidney Disease Improving Global Outcomes (KDIGO) guidelines [1, 26, 27], British National Formulary-2022 [28], and manufacturer leaflets. The daily dosage of each medication was established by multiplying the unit dose (mg) and the frequency of administration. The reference documents listed above were used to determine the recommended daily dose (mg) based on the patient’s eGFR. Inappropriate high dosages were identified by comparing the prescribed drug’s daily dose to its recommended daily dose. Similar methodologies were used in other studies that investigated inappropriate high dosages among CKD patients [10, 11, 29, 30].

Statistical analysis

The data were analysed using Statistical Package for Social Sciences (version 23). Multiple binary logistic regression analysis was used for evaluating the factors associated with receiving inappropriate high doses. After checking for collinearity, those independent variables which had a p-value < 0.20 in univariate analysis were entered in multivariate analysis. If two variables had a high collinearity (tolerance value < 0.10 and/or variance inflation factor > 10) one of them was excluded from the final model. A p-value < 0.05 was considered statistically significant.

Results

Socio-demographic and clinical characteristics of patients

A total of 365 ND-CKD patients were assessed for inclusion in the study. Of those patients, 325 met the established eligibility criteria, and 303 were included in the final analysis after giving consent. The mean age of study participants was 52.9 ± 14.0 years. Majority of them were males (56.4%), 41–60 years old (55.4%), had body weight of > 80 kg (55.4%) and suffered from CKD stage 5 (40.6%). Moreover, nearly all of the patients had at least one comorbidity (98.7%) with hypertension being the most common one (84.2%), followed by anaemia (78.2%) and diabetes mellitus (43.6%) (Table 1).

Table 1 Socio-demographic and clinical characteristics of patients
Full size table

Drugs prescription pattern

Table 2 displays the drug prescription pattern of study participants, wherein, a total of 2,265 medications were prescribed, with each patient receiving a median of eight different drugs (interquartile range 6–9 drugs).

Table 2 Drugs prescription pattern
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Frequency and factors associated with drugs prescribed at inappropriate high doses

Based on the dosing guidelines, 34.5% (783/2265) of these drugs should have dosed according to the patients’ eGFR. However, among these 783 drugs, doses were not adjusted for 56.1% (440) of them in 53.4% (162) patients. The most common drugs not adjusted for dose based on patient’s eGFR were cefixime (100%) followed ciprofloxacin (83.3%), lisinopril (76.9%), bisoprolol (76.6%), glibenclamide (75.0%), losartan (70.3%), tramadol (68.0%), spironolactone (66.6%), aspirin (63.1%), metformin (60.6%) sitagliptin (60.6%), clarithromycin (57.1%), simvastatin (56.5%), domperidone (53.9%), captopril (52.0%) enalapril (51.8%), hydrochlorothizide (51.1%) and gliclazide (50.0%) (Table 3).

Table 3 Pattern and frequency of drugs with unadjusted doses
Full size table

Factors associated with inappropriate high dosing

The results of multivariate binary regression analysis revealed that patient’s age of 41–60 years (OR = 5.76, p-value < 0.001) and > 60 years (OR = 9.49, p-value < 0.001), suffering from hypertension (OR = 2.68, p-value = 0.012), diabetes mellitus (OR = 3.47, p-value < 0.001) and cardiovascular disease (OR = 2.82, p-value = 0.004) had statistically significant association with receiving inappropriate high doses. The fitness of this model was based on non-significant Hosmer Lemeshow (p-value = 0.386) overall percentage of 78.2% from classification table (Table 4).

Table 4 Factors associated with receiving inappropriate high doses
Full size table

Discussion

This study evaluated the frequency, pattern and factors associated with inappropriate high doses in ND-CKD patients who received treatment at nephrology OPD of a tertiary care hospital in Pakistan. In order to make a distinction between the patients suffering from CKD and acute kidney injury (who need frequent dose adjustment), we included only established ND-CKD patients who were previously been treated for CKD at the study site or other hospitals or clinics. We observed that among the total prescribed drugs (n = 2265), 34.5% (n = 783) required dose adjustment, and only 45.9% (n = 440/783) drugs had their doses adjusted appropriately. The proportion of drugs with unadjusted doses (56.1%) in our study was within the range (13-84.3%) reported by studies conducted in Pakistan and elsewhere [7,8,9,10, 18]. The variable proportion of drugs with unadjusted doses in different studies could be due to differences in the study population (inpatients vs. outpatients), CKD stages, presence of comorbidities, the approaches and references used for evaluating dose appropriateness, prescribing pattern and availability of clinical pharmacists at the study sites [7,8,9,10, 18, 31]. The physicians’ lack of knowledge about the drugs requiring dose adjustment in CKD patients, underestimation of the potential adverse consequences [7,8,9,10, 18, 31, 32], and a lack of consensus on appropriate renal dosing guidelines for many drugs [7] could be some of the possible explanations for high proportion of drugs with unadjusted doses at the study site. Although the use of multiple reference documents for defining dose appropriateness was the strength of this study, but we did not evaluate the control of comorbidities, this could have been a potential cause of physicians’ hesitation to down-titrate the doses of drugs during the clinical encounters, contributing to the high prevalence of inappropriate dosing at the study site. However, it is also important to acknowledge that the use of a daily dose cut-off value criterion to define inappropriate high doses in our study may have resulted in an underestimation of the overdose rate.

Although, antibiotics (cefixime, ciprofloxacin and clarithromycin) comprised only 7.9% (24/2265) of the total prescribed drugs in our study, we found that 79.1% (19/24) of them were not adjusted for dose. The inappropriate dosing of these drugs in patients with CKD may lead to acute renal failure with tubulointerstitial nephritis [33, 34], neurotoxicity (hallucination and psychosis) [35] and cardiotoxicty (QT interval prolongation and sudden cardiac death) [35]. In our study, metformin and sitagliptin were the two most frequently prescribed antidiabetic agents, followed by glibenclamide, gliclazide and glimepiride. However, it was noted that doses of 59.2% of the prescribed antidiabetics [metformin (60.6%), sitagliptin (60.6%), gliclazide (50.0%), glimepiride (41.6%) and glibenclamide (75.0%)] were not adjusted appropriately. This is concerning as the use of metformin in CKD patients with concurrent hypoxemic conditions may lead to lactic acidosis [3], and it is recommended that the dose of metformin should be reduced by 50% in CKD stage-3, and should be avoided altogether in CKD stage 4 and 5 patients [36]. Additionally, the plasma concentration of sitagliptin can increase by two to four folds in patients with moderate to severe CKD, increasing the risk congestive heart failure [37, 38]. Therefore, it is recommended to start sitagliptin at a lower dose in patients with an eGFR < 45 ml/min/1.73 m2 [39]. Glibenclamide, gliclazide and glimepiride are long acting potent hypoglycemic drugs. Their use without dose adjustment in patients with renal impairment could result in episodes of severe hypoglycaemia [1]. The renin-angiotensin system inhibitors (ACEIs and ARBs) due to their antiproteinuric, nephroprotective and cardioprotective effects and halting the progression of renal impairment are preferred agents in CKD patients. However, it is concerning that in our study doses of captopril (52.0%), enalapril (51.8%), lisinopril (76.9%), losartan (70.3%) and valsartan (41.9%) were not adjusted in CKD patients. The use of these agents without dose adjustment in CKD stage 4 and 5 patients, particularly in the presence of congestive heart failure and non-steroidal anti-inflammatory drugs (NSAIDs), could cause acute renal failure and hyperkalemia [27, 40,41,42,43]. Additionally, our study found that doses of bisoprolol (76.6%) and atenolol (42.8%) were not adjusted. As these agents are hydrophilic and mainly excreted through the kidney, their use without dose adjustment could result in drug induced cellular injury, inflammation in the renal interstitium and acute renal failure in CKD patients [3, 44, 45]. The analysis further revealed that doses were also not adjusted for hydrochlorothiazide (56.1%) and spironolactone (66.6%). It is worth noting that hydrochlorothiazide has been reported to be ineffective in patients with eGFR < 30 ml/min/1.73m2, and its use in CKD stage 4 and 5 patients could lead to severe episodes of hyponatremia, hypokalaemia, volume depletion and acute kidney injury [46, 47]. On the other hand, the inappropriate high doses of spironolactone in patients with eGFR < 30 ml/min/1.73m2 could result in severe hyperkalaemia and increase the absolute risk of worsening kidney function [46, 47]. As the excretion of domperidone decreases with decline in kidney function, the repeated doses can increase its plasma half-life in CKD stage 4 and 5 patients. Its prescription with unadjusted dose (53.9% in the current study) could result in QT-interval prolongation and increased risk of sudden cardiac death in CKD patients suffering from cardiovascular diseases [48]. The study further showed that inappropriate high doses of aspirin and paracetamol were prescribed to 43.1% patients who were receiving them. As these agents inhibit prostaglandin-E2 which can result in vasoconstriction and a decrease in renal blood flow, they can potentially worsen the renal function. Therefore it is advised to avoid these agents until absolutely necessary. If their use is unavoidable, treatment should be started with the minimum effective doses, and they should only be used for the shortest possible period [49]. The prescription tramadol without dose adjustment could result in its extended plasma half-life and substantial adverse effects on central nervous system [50].

The multivariate analysis in our study revealed that patients over the age of 40 years and those with hypertension, diabetes mellitus and cardiovascular diseases were at significantly high risk of receiving inappropriate high doses of drugs. Our findings are consistent with previous studies that have reported older age as a risk factor for receiving inappropriate high doses of renally cleared drugs [10, 12]. While age related deterioration in renal function should warrant dose reduction or avoidance of nephrotoxic drugs even in the absence of CKD, unfortunately, these factors are often not taken in account when prescribing medications [7, 12]. Likewise, our study findings are consistent with previous research which suggests that comorbidities like hypertension, diabetes mellitus and cardiovascular diseases can increase the risk of CKD patients receiving inappropriate high doses of medications [7, 10,11,12]. Given that these comorbidities are often present in CKD patients and can contribute to renal impairment, therefore, these patients treated with multiple drugs are at greater risk of receiving inappropriate high doses [12].

Although our study had several strengths, including a sufficient sample size, the multiple reference documents to assess the appropriate drug dosage, and the use of eGFR for estimating renal function, there are some limitations that must be acknowledged. First our study was conducted at a single centre, which may limit the generalizability of our results to other settings. Our participants were selected using convenience sampling technique, which may not have been the representative of the entire CKD population. We also could not evaluate the potential consequences of inappropriate high dosing on patients’ clinical outcomes. The use of single serum creatinine value for calculating eGFR could have under or overestimated renal function. Furthermore, the physicians at our study site may have considered other parameters such as blood pressure, blood glucose, cholesterol, or serum electrolytes levels when making dose adjustments, which we were unable to account for in our analysis. It is also possible that different dosing guidelines were used for dose adjustment than those utilized in our study. Therefore, to confirm the findings of our study and overcome these limitations, a large multicentre study that considers a wider range of factors affecting medication dosing in CKD patients is recommended.

Conclusion

The study findings highlight a significant quality gap in medication dosing for patients with ND-CKD at the study site, as inappropriate doses were prevalent, and most drugs requiring dose adjustment were not appropriately adjusted. To address this issue, the continued medical education of clinical pharmacokinetics for doctors, the calculation of GFR by the support staff prior to prescription, drug dosing services provided by clinical pharmacists, and the display of charts of drugs requiring dose adjustment in CKD patients may help to reduce the frequency of inappropriate dosing. Special attention should be paid to the drugs and patients with identified risk factors for inappropriate high dosing.

Data availability

All data gathered or analyzed during this study are included in the article. The raw data on which conclusions of this manuscript is based is available upon request. Please contact Nafees Ahmad at nafeesuob@gmail.com.

Abbreviations

ACEIs:

Angiotensin converting enzymes inhibitors

ARBs:

Angiotensin receptor blockers

CI:

Confidence interval

CKD:

Chronic kidney diseases

eGFR:

Estimated glomerular filtration rate

ND:

Non-dialysis

NSAIDs:

Non-steroidal anti-inflammatory drugs

OPD:

Outpatients department

OR:

Odds ratio

SPH:

Sandeman Provincial Hospital

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Acknowledgements

Authors are thankful to all the patients who have participated in this study and the clinical and support staff of SPH for their facilitation in data collection.

Funding

The authors have no support or funding to report.

Author information

Authors and Affiliations

  1. Department of Pharmacy Practice, Faculty of Pharmacy and Health Sciences, University of Balochistan, Quetta, Pakistan

    Muhammad Hayat, Nafees Ahmad & Wajeeha Siddique

  2. Department of Nephrology, Bolan Medical College, Quetta, Pakistan

    Syed Liaquat Ali Khan & Syed Mohkumuddin

  3. Department of Pharmacy, Quaid-i-Azam University, Islamabad, Pakistan

    Amjad Khan

  4. Department of Pharmacy Practice, Faculty of Pharmacy, The Islamia University of Bahawalpur, Bahawalpur, Pakistan

    Muhammad Atif

Authors
  1. Muhammad Hayat
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  2. Nafees Ahmad
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  3. Syed Liaquat Ali Khan
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  4. Syed Mohkumuddin
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  5. Wajeeha Siddique
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  6. Amjad Khan
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  7. Muhammad Atif
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Contributions

MH, NA, SM, and AK conceptualized and designed the study. MH collected the data. MH, NA and WS analyzed the data. NA, MH and MA wrote the manuscript. All authors critically reviewed the manuscript. NA also supervised the study. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Nafees Ahmad.

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Competing interests

The authors declare no competing interests.

Ethics approval and consent to participate

Ethical approval and permission for the conduction of this study were granted by Research and Ethics Committee of Faculty of Pharmacy and Health Sciences, University of Balochistan Quetta and permission to conduct the study was granted by SPH. The principal investigator briefed the study subjects about the purpose of the study in clear and simple language. Written informed consent was taken from educated patients, while in case of uneducated patients, audio recorded oral informed consent was taken in the presence of a witness. Furthermore, we confirm that all methods were performed in accordance with the relevant guidelines and regulations.

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Hayat, M., Ahmad, N., Khan, S.L.A. et al. Pattern, frequency and factors associated with inappropriate high dosing in chronic kidney disease patients at a tertiary care hospital in Pakistan. BMC Nephrol 24, 118 (2023). https://doi.org/10.1186/s12882-023-03167-5

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  • DOI: https://doi.org/10.1186/s12882-023-03167-5

Keywords

BMC Nephrology

ISSN: 1471-2369

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