Ketamine Pharmacokinetics in Children Having Heart Surgery

Condition(s) targeted: C.Surgical Procedure; Cardiac

Intervention: Ketamine (Drug)

Phase: N/A

Status: Completed

Sponsored by: Arkansas Children's Hospital Research Institute

Official(s) and/or principal investigator(s):
Adnan T Bhutta, M.D., Principal Investigator, Affiliation: Arkansas Children's Hospital and University of Arkansas for Medical Sciences

What are the pharmacokinetics of ketamine in infants and children requiring ketamine for induction of anesthesia for cardiac surgery that requires CPB? Specific Aim 1: To determine the pharmacokinetic parameters of a single intravenous bolus dose of ketamine in infants and children undergoing cardiac surgery with and without CPB (cardio-pulmonary bypass). Specific Aim 2: To describe the disposition of ketamine's primary active metabolite, norketamine,following a single intravenous bolus dose of ketamine in infants and children undergoing cardiac surgery with and without CPB. Specific Aim 3: To determine the relationship between ketamine and norketamine pharmacokinetic parameters and age as well as CPB time.

Official title: Ketamine Pharmacokinetics in Children Undergoing Cardiac Surgery

Study design: Endpoint Classification: Pharmacokinetics Study, Intervention Model: Single Group Assignment, Masking: Open Label, Primary Purpose: Supportive Care

Primary outcome: To measure how long ketamine remains in blood after a single dose of ketamine is given (venous) to children undergoing cardiac surgery on cardiopulmonary bypass (CPB)compared to levels of children undergoing cardiac surgery without CPB.

Detailed description: The role of ketamine in pediatric anesthesia is well established. It is one of the most commonly used agents for conscious sedation in pediatrics. Its widespread use stems for its abrupt onset of action and brief duration of sedation. There is limited ketamine pharmacokinetic data in children and none to our knowledge in infants and young children who will be given an intravenous bolus dose before a surgical procedure that includes cardiopulmonary bypass. Ketamine is marketed as a racemic mixture (50: 50 mixture of S- and R-ketamine enantiomers). Ketamine undergoes N-demethylation (CYP3B6, 2C9, and 3A4) to its primary active metabolite,norketamine, with minor inactive metabolites, dehydroxynorketamine, generated secondary to direct oxidation. Ketamine exhibits a high intrinsic clearance with hepatic clearance dependent on hepatic blood flow under normal circumstances. One inherent disadvantage associated with the use of cardiopulmonary bypass (CPB) is the potential for organ dysfunction post-operatively. We propose an open-label controlled study describing the disposition of ketamine in 28 infants and children who will be undergoing cardiac surgery with (n=16) and without (n=12) CPB. We anticipate that cardiopulmonary bypass alters the pharmacokinetics of ketamine.

Minimum age: N/A. Maximum age: 6 Years. Gender(s): Both.

Criteria:

Inclusion Criteria:

- ≤ 6 years of age

- cardiac surgical procedure

- Indwelling arterial line or central venous line for blood sampling

Exclusion Criteria:

- patients with known hepatic dysfunction(>3 times normal AST & ALT)

- clinically significant alteration (as determined by the investigator) hemoglobin or

hematocrit

- patients receiving medications known to be potent inhibitors or inducers of CYP3A4

and CYP2C19

- patients with significant malnutrition (< 1%tile for age-adjusted weight)

- patients enrolled in other studies that require frequent blood sampling during and

after cardiac surgery

- any contraindication for ketamine administration

- ketamine administration within the previous 24 hours

- Patients with known history of pulmonary hypertension

Arkansas Children's Hospital, Little Rock, Arkansas 72202, United States

Starting date: June 2006
Last updated: February 26, 2013