Effect of Tumescent Lidocaine on Platelet Function

Study Overview
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Brief Summary
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The purpose of this study is to evaluate the effect of lidocaine, delivered into subcutaneous tissue for tumescent local anesthesia, on platelet activation following the tumescent liposuction.

Detailed Description
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The current research study is intended to examine this hypothesis by determining if tumescent lidocaine increases the results of a test which measures the volume of bleeding which occurs when a tiny standardized incision is made on the forearm. This test is the BA test. The investigators will do BA tests before and after infiltration of lidocaine in the form of tumescent local anesthesia for liposuction and then compare the differences of these BA test results. The purpose of the present research project is to study how platelet function after surgical trauma (liposuction) is affected by tumescent lidocaine. The investigators hypothesize that lidocaine, delivered in the form of tumescent local anesthesia, inhibits surgical trauma-induced platelet activation as measured by the in-vivo Klein Bleeding Area test (www.onlinePFT). The Klein Bleeding Area (BA) test is an extension of the classic Ivy Bleeding Time (BT) test. The BT test, an in-vivo test for an abnormal bleeding tendency, involves making a small standardized cut in the skin and measuring the duration of bleeding. The BA test has significantly more sensitivity and specificity than the BT Test. This research project is a dosage-response clinical trial in which the predictor variable is the milligram per kilogram (mg/kg) dosage of tumescent lidocaine and the response variable is the Bleeding Area (BA). A result indicating that tumescent lidocaine does indeed impair post-operative platelet function would justify a subsequent randomized clinical trial of tumescent lidocaine for preventing post-operative thromboembolism.

Official Title
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Tumescent Lidocaine Effects on Platelet Function Following Liposuction Surgical Trauma: a Prospective Controlled Dosage-response Phase I Clinical Trial

Conditions
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Postoperative Thromboembolism

Intervention / Treatment
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* Drug: tumescent lidocaine infiltration


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Patients who have requested tumescent liposuction Healthy adults ASA Class I, II, or III Exclusion Criteria: Known allergy to lidocaine younger than 18 years Positive serology for Hepatitis C, HIV Chronic fatigue Syndrome known bleeding disorder significant psychiatric problems History of seizures Clinically significant cardiac arrhythmia Conditions predisposing to surgical site infections Active bacterial infection taking drugs know to affect hemostasis

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Prevention
Allocation: Non-Randomized
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: tumescent lidocaine infiltration<br>Assess Platelet function with respect to dosage of tumescent lidocaine There is only one arm. | Drug: tumescent lidocaine infiltration<br>* Tumescent local anesthesia containing dilute lidocaine is infiltrated into subcutaneous tissue prior to liposuction<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Tumescent lidocaine effects on platelet function following liposuction surgical trauma: a prospective controlled dosage-response phase I clinical trial | The purpose of the present research project is to study how platelet function after surgical trauma (liposuction) is affected by tumescent lidocaine. We hypothesize that lidocaine, delivered in the form of tumescent local anesthesia, inhibits surgical trauma-induced platelet activation as measured by the in-vivo Klein Bleeding Area test (www.onlinePFT). | two years | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Platelets, Inhibition, Lidocaine, Thromboembolism, Prevention, Lidocaine effects on platelets