Question

Your patient us a 47 year old male with wide complex tachycardia . Medical command orders a Lidocaine infusion of 2 mg/min. you choose a micro drip set( 60 gtt/min).

Dose on hand Lidocaine 2 grams/ 500 mL.

What is the concentration of this IV nag of Lidocaine in mg/ mL.?
How many mL/ he are needed?
How many drops per minute are needed?
How many drops per second are needed?

Answer 1

Answer ;

Ordered dose is 2 mg/ min.
Available dose is 2 g/ 500 ml that is 2000 mg/ 500 ml
Hence 1 ml contain 4 mg.

• The concentration of this IV bag of Lidocaine is 4 mg / ml
  
• Ordered dose is 2 mg/ min i.e) 120 mg/ hr
  Therefore 30 ml / hr of solution is needed.
  
• Here the available volume is 30 ml with the drop factor of 60 gtt / ml and the time of one hour
  Hence the flow rate would be 30 x 60 / 60 = 30 gtt / mins
  There the patient needs 30 drops per minute
  
• If the drops are calculated in seconds,
  The patient would need 0.5 drops per seconds