dazle once bubbled...
What's the best technique to locate the sternum midpoint when administering CPR?
Hi dazle,
I do hope you never have to administer CPR but it is like so many things that we are taught to do just-in-case and (to my possibly jaundiced mind) a lot of unecessary time and effort is expended on teaching the "DIR" method.
I've had to do this one or two times and when the proverbial hits the fan you just get on with it.
The principle of chest compressions is to restore a circulation in an otherwise stalled heart to prevent it (and the brain) from suffering catastrophic irreparable damage. It is seldom curative and must be maintained until definitive treatment is give - most often and successfully by defibrillation in the public first aid situation. In diving it is likely that the cause of a cardiac arrest is other from heart disease, such as pulmonary barotrauma, and in general these will not respond to defibrillation.
In CPR the theory is that compression of the chest wall flattens the heart against the spine expelling the blood contained in it. In addition it causes movement of the blood within the chest.
On release of the compression, due to its natural elasticity the heart expands and this expansion sucks blood into it, while the expansion of the chest likewise causes venous blood to enter the chest. Divemed's link shows what is supposed to happen.
I may get flamed for this, but I honestly believe in the circumstances of a cardiac arrest (and chest compressions should not be given when there is no arrest!) the sooner it is started the better and why waste several seconds finding the exact spot? This procedure is "time critical".
It is my impression that within a couple of compressions even the inexperienced rescuer will adjust his position to suit and find the best way to continue.
It is VERY tiring I might add!
(I know, I have just failed my ACLS exam!!!
)