Lidocaine is a local anesthetic that is used during invasive procedures like surgery, needle punctures, or insertions of catheter or breathing tubes. The maximum dose of lidocaine is 4.5 mg/ kg body weight. What is the maximum volume of a 1% (m/v) lidocaine solution that can be injected into a Filipino patient (average weight of a Filipino man is 46 kg).
Question
Lidocaine is a local anesthetic that is used during invasive procedures like surgery, needle punctures, or insertions of catheter or breathing tubes. The maximum dose of lidocaine is 4.5 mg/ kg body weight. What is the maximum volume of a 1% (m/v) lidocaine solution that can be injected into a Filipino patient (average weight of a Filipino man is 46 kg).
Solution
To solve this problem, we need to follow these steps:
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Calculate the maximum dose of lidocaine for the patient. The maximum dose of lidocaine is 4.5 mg/kg body weight. So, for a Filipino man with an average weight of 46 kg, the maximum dose would be 4.5 mg/kg * 46 kg = 207 mg.
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Determine the amount of lidocaine in a 1% (m/v) solution. A 1% (m/v) solution means there is 1 g (or 1000 mg) of lidocaine in 100 mL of solution. So, in 1 mL of solution, there would be 1000 mg/100 mL = 10 mg.
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Calculate the maximum volume of the 1% lidocaine solution that can be injected. To do this, divide the maximum dose by the amount of lidocaine per mL. So, 207 mg / 10 mg/mL = 20.7 mL.
Therefore, the maximum volume of a 1% lidocaine solution that can be injected into a Filipino patient with an average weight of 46 kg is 20.7 mL.
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