Hi,
Why did u not try paracervical block? its easy to perform, patient is haemodynamically stable and pt can walk home
Shivdatta

The Allen Test was first described by Edgar Van Nuys Allen in Mayo's Clinics. It is performed with the patient sitting, with his/her hands supinated on the knees. Standing at the patient's side with your fingers around his/her wrist, compress the tissue over the radial artery. Check for the return of color with flush in the thumb nail.

This test was modified by Ryan, the procedure of which is as follows:
•   Instruct the patient to clench his/her fist, or if the patient is unable, you may close the hand tightly.
•   Using your fingers, apply occlusive pressure to both the ulnar and radial arteries. This maneuver obstructs blood flow to the hand. Allow a few minutes for the blood to drain from the hand while the patient opens and closes his/her hands several times.
•   While applying occlusive pressure to both the arteries, have the patient relax his/her hand. Blanching of the palm and fingers should occur. If it does not, you have not completely occluded the arteries with your fingers.
•   Release the pressure on the ulnar artery while keeping the radial artery occluded. Normal skin color should return to the ulnar side of the palm in 1-2 seconds, followed by quick restoration of normal color to the entire palm. The usual values are:
o   < 7 sec is normal
o   8-14 sec is borderline
o   >15 sec in the hand and >10 sec in the foot is taken as abnormal and radial artery puncture is contraindicated.
•   This normal flushing of the hand is considered to be a positive modified Allen's test  which denotes that the ulnar artery is patent and has good blood flow. A negative modified Allen's test is one in which the hand does not flush within the specified time period.

The likely reason is the foaming of H2O2. It  foams  because blood and cells contain an enzyme called catalase. Since a cut or scrape contains both blood and damaged cells, there is lots of catalase floating around.
When the catalase comes in contact with hydrogen peroxide, it turns the hydrogen peroxide (H2O2) into water (H2O) and oxygen gas (O2).
2H2O2 --> 2H2O + O2
Catalase does this extremely efficiently -- up to 200,000 reactions per second. The bubbles you see in the foam are pure oxygen bubbles being created by the catalase. Try putting a little hydrogen peroxide on a cut potato and it will do the same thing for the same reason -- catalase in the damaged potato cells reacts with the hydrogen peroxide.

This reaction also liberates a lot of heat. The forcing-in of O2 bubbles into open cappilaries follows a similar technique as methy-methacrylate (bone cement) embolism. This also happens due to an exothermic reaction.

The usual concentration is 3%. If u use 90-% concentration , hydrogen peroxide makes a great rocket propellant!

We practice CSE routinely in our hospital. The plan is that if the pt comes with >3 contractions / 10 min we give it. This is because if it is less, then a pure epidural give adequate relief. At that time pts require fast releif and 25 mics of fentanyl is good for that