You must first ask the victim to cough, if they are able to cough they should try and expell the blockage in this way. If this fails or they are unable to cough, 5 back blows ( a firm strike with the palm of the hand between the shoulder blades) should be performed, checking between each blow to see is the blockage has cleared. If the blockage has still not cleared then abdominal thrusts should be carried out. Stand behind the victim make a fist with one hand and place it above the victims belly button, with your other hand hold your fist and pull firmly in and upwards repeat 5x checking between each. If the blockage is still in place then you should alternate between 5x back blows and 5x abdo thrusts- after 3 sets of back blows and abdo thrusts if the blockage is not cleared dial 999/ 911, and continue the blows and thrusts.
If you manage to clear the blockage the victim should always be sent to see a doctor is check for internal injuries.
If and any point the victim becomes unconscious CPR at a rate of 30compressions 2rescue breaths should be carried out immediately and 999/ 911 dialled
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there is no set number like there is for CPR, once the victim cannot cough and starts "weezing" then you start giving abdominal J-thrusts until what ever is blocking the airway comes out, or the victim passes out. like i said there is no set number just do it until one of those things happens
update: in accordance with the new obstructed airway procedure in standard first aid:
5 thrusts are given, followed by 5 back blowssimilar to those given to an infant that is choking. this is repeated until what ever is blocking the airway comes out, or the victim passes out.
You should give as many as is needed. Sometimes just a few will suffice and sometimes you will need to do some more.