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{"target":"https://pubannotation.org/docs/sourcedb/PMC/sourceid/6713589","sourcedb":"PMC","sourceid":"6713589","source_url":"https://www.ncbi.nlm.nih.gov/pmc/6713589","text":"Cefazolin Pharmacokinetics in Premature Infants\n\nAbstract\nObjective:\nPharmacokinetic (PK) data to guide cefazolin dosing in premature infants is virtually non-existent. Therefore, we aimed to characterize cefazolin PK in infants aged ≤32 weeks of gestation at birth.\n\nStudy Design:\nWe conducted a prospective, open-label PK and safety study of cefazolin in infants ≤32 weeks gestation from a University Medical Center. We administered intravenous cefazolin and collected both timed and scavenged blood samples. We analyzed data using non-linear mixed effect modeling and simulated several dosage regimens to achieve target concentrations against methicillin-susceptible Staphylococcus aureus.\n\nResults:\nWe analyzed 40 samples from 9 infants and observed that premature infants had lower clearance and greater volume of distribution for cefazolin compared to older children. The median (range) individual Bayesian estimates were 0.03 L/h/kg (0.01-0.08) for clearance and 0.39 L/kg (0.31-0.52) for volume.\n\nConclusion:\nSimulations suggested reduced cefazolin dosing based on postmenstrual age achieve target concentrations and potentially reduce unnecessary exposure.\n\nIntroduction\nSuboptimal dosing in premature infants can occur when dosage regimens do not account for physiologic changes affecting drug disposition [1]. Cefazolin is a cephalosporin approved in children \u003e1 month of age to treat indicated susceptible infections [2] at an initial total daily dose of 25-50 mg/kg [2]. Maximum cefazolin effect occurs when free concentrations are \u003e minimum inhibitory concentrations (MIC) for 60-70% of the dosing interval [3]. The surrogate pharmacodynamic marker of concentration at 75% of the dosing interval (C75) can predict target attainment [1].\nCefazolin is commonly used off-label in premature infants. While weight and postnatal age affect cefazolin pharmacokinetics (PK) [4], data in premature infants are virtually non-existent. In children 0.8-10 years of age, estimates of volume of distribution (Vz) for cefazolin are 0.08-0.263 L/kg and estimates of clearance are 0.048-0.1 L/hr/kg [5-7]. Cefazolin binds to albumin, with mean (range) protein binding estimates of 49% (17-78) in neonates [8]. Because up to 80% of cefazolin undergoes glomerular filtration and active tubular secretion as intact drug, the reduced renal function in premature infants may substantially increase cefazolin exposure.\n\nMethods\n\nStudy design\nWe conducted a prospective, open-label PK and safety study (NCT00850122) in accordance with the Declaration of Helsinki. Duke University and Universidade Federal de São Paulo/Hospital São Paulo IRBs approved the protocol. We obtained signed informed consent from all participants. We determined sample size based on the ability to observe a serious adverse event.\n\nPopulation\nBetween 2013-2015, we enrolled infants aged ≤32 weeks at birth, \u003e48 hours of age, and \u003c121 days of age who 1) had a suspected systemic infection, 2) were receiving cefazolin for prophylaxis, or 3) were receiving cefazolin to treat a systemic infection. We excluded infants with a history of β-lactam anaphylaxis, cefazolin exposure ≤1 month from enrollment, or serum creatinine \u003e1.7 mg/dL.\n\nDosing and sample collection\nWe administered cefazolin via intravenous (IV) infusion over 30 minutes to infants with postnatal age ≤28 days (25 mg/kg Q12h) and \u003e28 days (25 mg/kg Q8h) [6-8]. We collected up to 4 scavenged blood samples throughout the dosing interval supplemented with up to 6 timed (non-scavenged) blood samples (200 μl each) as follows: Q8h dosing: 0.5-1h, 1-3h, 6-8h after the 1st and 4th, 5th, or 6th dose; Q12h dosing: 0.5-1h, 1-3h, 6-12h after the 1st and 4th dose.\n\nAnalytics\nWe quantified cefazolin plasma concentration using high performance liquid chromatography/mass spectrometry (HPLC-MS/MS). We prepared calibration standards and quality-control samples using drug-free human EDTA plasma, with a linear concentration range from 0.5-500 μg/mL and lower limit of quantitation of 0.5 μg/mL.\n\nPopulation PK analysis\nWe analyzed data with NONMEM 7 using the first-order conditional estimation method with interaction algorithm. We explored 1-, and 2-compartment structural models and proportional, additive, and proportional-plus-additive residual error models. We included weight as a covariate for structural parameters by estimating or fixing weight on clearance to 0.75, and fixing weight on volume to 1. We assessed model fit using diagnostic plots, parameter precision, and objective function value (OFV).\n\nModel-building\nWe investigated continuous covariates for their influence on PK parameters, including postmenstrual age (PMA), postnatal age (PNA), gestational age (GA), and serum creatinine. We included concomitant gentamicin, ampicillin, and amikacin as categorical covariates. We plotted individual participant deviations from the typical population parameter values (ETAs) against covariates and evaluated those with a graphical relationship for inclusion in the model. We defined the threshold for significance of a single covariate as a reduction of OFV by \u003e3.84 (p\u003c0.05) and used backward-elimination when \u003e1 covariate was statistically significant.\n\nModel evaluation\nWe performed prediction-corrected visual predictive checks (pcVPCs) for the final model by generating 1000 Monte Carlo simulation replicates/time point. We used the dosing and covariate values from the study population to simulate concentrations, and compared simulated to observed results. To evaluate parameter precision, we generated 95% confidence intervals using nonparametric bootstrapping (1000 replicates).\n\nDosing simulation\nWe simulated total and free cefazolin concentrations using the final population PK model, the Empirical Bayesian Estimates (EBEs), and clinical data for each participant. We estimated free concentrations using fraction unbound (fu) 0.34 and 0.68 [8]. For each participant, we simulated several dosage regimens infused over 0.5 hours, using a primary target of simulated free steady-state C75 \u003e1x MIC of cefazolin (4 μg/mL) against methicillin-susceptible Staphylococcus aureus (MSSA) [9]. We also simulated free steady-state C75 \u003e5x MIC as a surrogate marker for excessive exposure.\n\nResults\n\nParticipant characteristics\nClinical characteristics of the infants are described in Table 1, with individual subject data in supplemental Table 1. Altogether, 41 samples were obtained from 9 infants; 1 concentration below the quantifiable limit was excluded. For scavenged samples, the median (range) time from sample collection to freezing was 2.8 (0.7-7.9) hours. The median (range) of infant characteristics were: PNA 16 days (3-91); PMA 30.7 weeks (25.7-44.6); weight 1.3 kg (0.7-2.8); albumin 3.0 g/dL (2.6-3.0); and serum creatinine 1.0 mg/dL (0.1-1.4). Using appropriate racial/ethnic growth parameters [10], two infants (22.2%) were small for gestational age with birth weight less than the tenth percentile for gestational age based on sex. We obtained 6 (2-6) samples per infant, and the median cefazolin concentration was 59.3 mcg/mL (10.1-183). Six infants received Q12h dosing, and 3 infants received Q8h dosing. All infants received treatment with concomitant antimicrobials, most commonly ampicillin (5/9), gentamicin (4/9), and amikacin (3/9).\n\nPK model development\nA summary of PK model building is outlined in Table 2. A 1-compartment model provided the best fit based on the goodness of fit and pcVPC plots, although the model over-predicted at concentrations \u003e80 mcg/mL. Univariable addition of PMA, PNA, GA, or creatinine to the clearance model did not result in a significant decrease in OFV (i.e. OFV reduction \u003c3.84). However, PMA \u003c34 weeks, PMA \u003c37 weeks, PNA \u003c17 days, and PNA \u003c25 days as categorical covariates on clearance significantly reduced OFV. Of these, PMA \u003c37 weeks on clearance had optimal performance based on visual inspection of the clearance vs. PMA relationship and the reduction in OFV (−4.2). Although PNA \u003c17 days had greater reduction in the OFV (−4.3), we implemented the PMA cutoff of \u003c37 weeks on clearance because 1) cefazolin is cleared predominantly through the kidneys, and 2) nephrogenesis finishes before 37 weeks [11]. We did not observe a relationship between volume and PMA, PNA, or GA. Addition of amikacin or ampicillin as a covariate on clearance resulted in a significant drop in OFV (4.5 and 4.3, respectively, p\u003c0.05) but was not included due to confounding, whereby subjects with high creatinine received concomitant ampicillin while subjects with normal creatinine received amikacin. Further, addition of concomitant medications did not reduce the OFV once PMA was included as a covariate on clearance.\nThe final model revealed that 96% of bootstrap datasets converged to \u003e2 significant digits. The median of bootstrap fixed effects parameter estimates were within 17% of population estimates from the original dataset for all parameters. The pcVPC revealed 10% (4/40) of observed concentrations were slightly outside the 90% prediction interval. The median (range) individual EBEs were 0.03 L/h/kg (0.01-0.08) for clearance and 0.39 L/kg (0.31-0.52) for volume. The relative standard error was 44% for clearance and 9% for volume. Other PK parameter estimates are outlined in Table 3.\n\nDosing simulation\nSimulations predicted that target attainment was sensitive to protein binding for some dosage regimens for each of the 9 subjects (Table 4). The regimen used in the clinical study (25 mg/kg Q12h for PNA ≤28 days, 25 mg/kg Q8h \u003e28 days) resulted in 100% attainment of \u003e1x MIC with wide ranges of protein binding, but with 56-78% of subjects having free C75 \u003e5x MIC. Conversely, regimen 5 also resulted in 100% attainment of \u003e1x MIC, but with fewer subjects (11-22%) having exposure \u003e5x MIC.\n\nDiscussion\nWe developed a 1-compartment PK model to characterize cefazolin disposition in infants ≤32 weeks of gestation. Despite a small cohort, our model had good performance based on pcVPCs and parameter precision, with only a slight tendency for over-prediction. We found that PMA (categorical) was a significant covariate for cefazolin clearance. However, unlike other reports [4], PMA (continuous) was not significant, probably due to low sample size and limited age distribution. Because cefazolin is renally filtered and actively secreted, the association between PMA and clearance may reflect renal maturation [11]. The median EBE clearance estimate in our study was 0.03 L/h/kg (range 0.01-0.08), approximately one-half that reported for a 9-day-old infant weighing 2720 g (0.068 L/kg/hr) [4]. Lower clearance estimates may be due to differences in study populations; the median GA in our study was 29.1 weeks, compared with 37 weeks elsewhere [4]. As expected from immature renal function, the cefazolin clearance for premature infants in our study was significantly lower than clearance reported in older children (0.048-0.1 L/hr/kg) [5-7]. Furthermore, the cefazolin EBE volume (0.39 L/kg) was higher than that reported in older children (0.08-0.263 L/kg) [5-7], likely because premature infants have a higher percentage of total body water.\nUsing the dosage regimen administered during this study, 100% of infants would obtain free C75 \u003e1x MIC; further, more than half would have exposure \u003e5x MIC for MSSA regardless of estimated unbound fraction. Simulations predict that a reduced dosage regimen (6 mg/kg IV Q12h for PMA \u003c37 weeks, 25 mg/kg IV Q8h for PMA ≥37 weeks and \u003c120 days) would also result in 100% attainment \u003e1x MIC; however, target attainment may be lower if deep tissue infections are targeted. Notably, this dosing is lower than other published simulations [4], likely from modeling differences (e.g., using unbound drug concentrations), simulation endpoint, and the degree of prematurity/critical illness of the underlying population. Although estimating free concentration using binding percentages has limitations [4], we simulated free concentrations using a wide range of published binding estimates to determine dosing implications across the binding spectrum.\nInfants in the study received cefazolin for a variety of clinical indications, including prophylaxis or treatment for a systemic infection. Therefore, it is possible that infants receiving cefazolin for treatment a systemic infection had more physiologic alterations that could impact PK. Despite this potential limitation, all 9 infants were critically ill with a median (range) of 7 (4-12) comorbid medical conditions.\nThere are some limitations of our study. Notably, our sample size was small and therefore our power to detect covariates was limited. In addition, the infants in our study had a limited distribution of gestational ages and were recruited from a Hispanic/Latino population. As a result, our proposed dosing regimen should be prospectively tested in a larger population before widespread clinical use.\nIn conclusion, premature infants exhibited a lower clearance and greater volume of distribution for cefazolin compared with older children. Dosage regimen simulations suggested reduced doses of cefazolin based on postmenstrual age may achieve target concentrations in neonates, and potentially reduce unnecessary drug exposure.\n\nSupplementary Material\n1\n\nAcknowledgements:\nThis work was supported by:\nNICHD, NIH-1K23HD060040-04\nNIGMS/NICHD, 2T32GM086330-06\nNICHD, K23 HD091398-01\nNIGMS, R35 GM122576\nConflicts of Interest:\nS.J.B. received salary and/or research support from the National Institutes of Health (2T32GM086330-06, 5R01-HD076676-04, HHSN275201000003I, HHSN275201800003I, 5U24-TR001608-03), the Rheumatology Research Foundation’s Scientist Development Award, and the Thrasher Research Fund. The National Institutes of Health sponsor open access.\nP.B.S. receives support from industry (www.dcri.duke.edu/research/coi.jsp).\nD.T. declares no disclosures or conflicts of interest.\nH.W. receives salary support for research from the National Institutes of Health Clinical and Translational Science Award (5UL1TR001117-05).\nK.L.R.B. receives funding from NIGMS, R35 GM122576.\nK.O.Z. receives support for research from the National Institute for Child Health and Human Development (NICHD) (HHSN275201000003I and K23HD091398) and the Duke Clinical and Translational Science Awards (KL2TR001115)\nN.D.R-C. received funding from training grant T32 from the National Institute of Child Health and Human Development (T32GM086330-06).\nD.K.B. Jr. receives support from the National Institutes of Health (award 2K24HD058735-10, National Institute of Child Health and Human Development (HHSN275201000003I), National Institute of Allergy and Infectious Diseases (HHSN272201500006I), ECHO Program (1U2COD023375-02), and the National Center for Advancing Translational Sciences (1U24TR001608-03); he also receives research support from Cempra Pharmaceuticals (subaward to HHSO100201300009C) and industry for neonatal and pediatric drug development (www.dcri.duke.edu/research/coi.jsp).\nM.C-W. receives support for research from the NIH (5R01-HD076676, HHSN275201000003I), NIAID/NIH (HHSN272201500006I), FDA (1U18-FD006298), the Biomedical Advanced Research and Development Authority (HHSO1201300009C), and from the industry for the drug development in adults and children (www.dcri.duke.edu/research/coi.jsp).\n\nTable 1. Clinical Characteristics\nCharacteristic Value1,2\nPostnatal age (days) 16 (3 – 91)\nPostmenstrual age (weeks) 30.7 (25.7 – 44.6)\nGestational age at birth (weeks) 29.1 (25.3 – 31.6)\nBody weight (kg) 1.3 (0.7 – 2.8)\nFemales 3 (33%)\nAlbumin (g/dL) 3.0 (2.6 – 3.0)\nTotal bilirubin (mg/dL) 6.9 (3.2 – 33.2)\nSerum creatinine (mg/dL) 1.0 (0.1 – 1.4)\nRace\n White 3 (33%)\n Black 6 (67%)\nEthnicity\n Hispanic or Latino 9 (100%)\nDose (mg/kg) 24.9 (23.3 – 25.2)\nDuration of cefazolin infusion (h) 0.5 (0.5 – 0.7)\n1 Continuous data represented as median (range) and categorical data is represented as n (%).\n2 Where applicable, data was at the time of first PK sample.\nTable 2. Model Building Steps\nDescription Model OFV ΔOFV1\nUnivariable analysis\nBase Model2 CL = θCL × (WT/1.3)1.7 255.1 -\nPMA on CL, maturation function CL = θCL × (WT/1.3)0.52 × (PMA3.7/(54.5 3.7+PMA3.7)) 253.5 −1.6\nPMA on CL CL = θCL × (WT/1.3)0.31 × (PMA/30.7)3.8 253.4 −1.7\nPNA on CL CL = θCL × (WT/1.3)1.1 × (PNA/16)0.25 254.5 −0.6\nGA on CL CL = θCL × (WT/1.3)1.7 × (GA/29.1)0.002 255.1 0\nSCR on CL CL = θCL × (WT/1.3)1.1 × (SCR/1.0)−0.50 252.6 −2.6\nPMA\u003c34PMA\u003c34 weeks, PMAC=1 (n=6)PMA≥34 weeks, PMAC=0 (n=3) CL = θCL × (WT/1.3)1.38 × 0.71PMAC 251.2 −3.9\nPMA\u003c37 PMA\u003c37 weeks, PMAC=1 (n=7) PMA≥37 weeks, PMAC=0 (n=2) CL = θCL × (WT/1.3)0.82 × 0.24PMAC 250.9 −4.2\nPNA\u003c25PNA\u003c25 days, PNAC=1 (n=6)PNA≥25 days, PNAC=0 (n=3) CL = θCL × (WT/1.3)0.73 × 0.33PNAC 251.2 −3.9\nPNA\u003c17PNA\u003c17 days, PNAC=1 (n=5)PNA≥17 days, PNAC=0 (n=4) CL = θCL × (WT/1.3)0.73 × 0.33PNAC 250.8 −4.3\nAmpicillin on CL CL = θCL × (WT/1.3)0.63 × 0.31Ampicillin 250.8 −4.3\nAmikacin on CL CL = θCL × (WT/1.3)0.80 × 4.01Amikacin 250.6 −4.5\nMultivariable analysis\nPMA\u003c37, ampicillin on CL CL = θCL × (WT/1.3)0.46 × 0.39PMAC × 0.48Ampicillin 249.1 −1.8\nPMA\u003c37, amikacin on CL CL = θCL × (WT/1.3)0.82 × 1.15PMAC × 4.49Amikacin 250.6 −0.3\n1 Change in OFV for the univariable analysis was relative to the base model; the multivariable analysis is relative to the intermediate PMA\u003c37 on CL model.\n2 V= θV for all models.\nAbbreviations: OFV: objective function value; CL: Clearance (L/h); V: Volume of distribution (L); PMA: Post-menstrual age (weeks); PNA: Post-natal age (days); SCR: Serum creatinine (mg/dL); GA: gestational age; WT: weight; Theta (θ): value of a parameter in a population that is updated during parameter estimation.\nTable 3. Population PK parameters.\nParameter Estimate RSE(%) Shrinkage(%) Bootstrap CI\n2.5% Median 97.5%\nStructural PK Model\nCL (L/h, 1.3kg) 0.099 44 - 0.011 0.104 0.183\nV (L, 1.3kg) 0.507 9 - 0.424 0.501 0.600\nWT on CL 0.817 73 - 0.008 0.937 3.885\nPMA\u003c37 on CL 0.243 55 - 0.064 0.283 3.070\nInter-individual Variability (IIV) (%CV)\nCL IIV 51.8 141 13 0.5 43 117\nV IIV 15.6 99 19 0.5 16 28\nResidual Variability\nProportional Error (%) 19.0 29 12 11 18 23\nAbbreviations: CL: Clearance; PMA: Postmenstrual age; RSE: Relative standard error; V:Volume of distribution; WT:Weight; CV: Coefficient of Variation\nTable 4. Simulated concentrations of free cefazolin at 75% of the dosing interval after different dosage regimens.\nC75, Free1\u003e1x MICfu=0.34 C75, Free\u003e5x MICfu=0.34 C75, Free\u003e1x MICfu=0.68 C75, Free\u003e5x MICfu=0.68\nPercent of Subjects Achieving Target\nRegimen 1  25 mg/kg IV Q12h (PMA \u003c37 weeks)  25 mg/kg IV Q8h (PMA ≥37 weeks \u0026 \u003c120 days) 100 56 100 78\nRegimen 2  25 mg/kg IV Q24h (PMA \u003c37 weeks)  25 mg/kg IV Q12h (PMA ≥37 weeks \u0026 \u003c120 days) 78 11 100 44\nRegimen 3  25 mg/kg IV Q24h (PMA \u003c37 weeks)  25 mg/kg IV Q8h (PMA ≥37 weeks \u0026 \u003c120 days) 100 11 100 44\nRegimen 4  12.5 mg/kg IV Q24h (PMA \u003c37 weeks)  25 mg/kg IV Q12h (PMA ≥37 weeks \u0026 \u003c120 days 44 11 100 11\nRegimen 5  6 mg/kg IV Q12h (PMA \u003c37 weeks)  25 mg/kg IV Q8h (PMA ≥37 weeks \u0026 \u003c120 days 100 11 100 22\n1 C75, free – Free concentration at 75% of the dosing interval calculated using total C75 and unbound fraction for cefazolin.\nAbbreviations: fu: fraction unbound; IV: intravenous; PMA: postmenstrual age; MIC: Minimum inhibitory concentration. 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