Pharmacokinetics of Ceftriaxone Free Fraction

Study Overview
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Brief Summary
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Prospective observational follow-up study for the study and modeling of the pharmacokinetics of the free fraction of ceftriaxone in patients treated with high doses of ceftriaxone (greater than or equal to 4 grams per day).

Detailed Description
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A prospective follow-up observational study to study and model the pharmacokinetics of the ceftriaxone free fraction in patients treated with high doses of ceftriaxone (greater than or equal to 4 grams per day). it is a pilot study that has between 10 and 20 patients. This study will not condition the treatment of patients at any time. The samples will be processed after their extraction. The concentration of the samples will be analyzed using a high-performance gilent infinity liquid chromatograph coupled to a mass spectrometer using positive or negative ionization using electrospray.

Official Title
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Pharmacokinetics of Ceftriaxone Free Fraction Administered at High for the Treatment of Serious Infections

Conditions
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Ceftriaxone Poisoning

Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Men or women over 55 years of age receiving treatment with high-dose ceftriaxone (minimum 4 grams / day) for any clinical indication in the study period. Creatinine <1.5 mg / dL The patient must have received at least 48 hours of treatment with the same previous therapeutic regimen to extraction. The subject or her representative must give their verbal or written consent to participate in the study. East Consent can be revoked at any time without prejudice to the patient. The consent it will be recorded in your medical record. Exclusion Criteria: Patients under 55 years of age. Creatinine> 1.5 mg / dL Patient with less than 48 hours of treatment with high-dose ceftriaxone. Subjects with allergy or hypersensitivity to cephalosporins and penicillins. Subjects who do not grant or withdraw their consent. Patients whose concomitant treatment presents possible interactions with the study medication. The possible interactions will be evaluated by staff of the Pharmacy Service.

Ages Eligible for Study
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Minimum Age: 55 Years

Sexes Eligible for Study
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All

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Cases<br>Patients treated with ceftriaxone doses equal to or higher 4 grams / day. | |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Maximum plasma concentration [Cmax] | Determine the maximum plasma concentration of ceftriaxone after the administration of high doses (equal to or greater than 4 grams / day). | Up to 24 weeks. | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| To determine the plasma concentration of the free fraction of ceftriaxone 24 hours after the administration of the daily dose (trough level) in patients receiving doses equal to or greater than 4 grams / day. | Plasma concentration of the free fraction of ceftriaxone after 24 hours of the start of the daily dose (trough level) in patients treated with doses at or above 4 grams / day. | Up to 24 weeks. | 
| Determine the plasma concentration of the free fraction of ceftriaxone during 24 hours in patients receiving doses equal to or greater than 4 grams / day. | Plasma concentration of the free fraction of ceftriaxone for 24 hours in patients receiving doses equal to or greater than 4 grams / day. | Up to 24 weeks. | 
| Ceftriaxone plasma clearance. | determine the plasma clearance of ceftriaxone in patients receiving doses equal to or greater than 4 grams / day. | Up to 24 weeks. |