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Intraosseous infusion (IO) is the process of injecting directly into the marrow of a bone to provide a non-collapsible entry point into the systemic venous system. This technique is used to provide fluids and medication when intravenous access is not available or not feasible. A comparison of intravenous (IV), intramuscular (IM), and intraosseous (IO) routes of administration concluded that the intraosseous route is demonstrably superior to intramuscular and comparable to intravenous administration (in delivering paediatric anaesthetic drugs). ==Procedure== The needle is injected through the bone's hard cortex and into the soft marrow interior which allows immediate access to the vascular system. An IO infusion can be used on adult or pediatric patients when traditional methods of vascular access are difficult or impossible. In most cases, the antero-medial aspect of the upper tibia is used as it lies just under the skin and can easily be palpated and located. The anterior aspect of the femur, the superior iliac crest and the head of the humerus are other sites that can be used. This route of fluid and medication administration is an alternative one to the preferred intravascular route when the latter cannot be established in a timely manner. When intravascular access cannot be obtained intraosseous access is usually the next approach. It can be maintained for 24–72 hours, after which another route of access should be obtained. Although intravascular access is still the preferred method for medication delivery in the prehospital area, advances in IO access for adults has caused many systems to re-think their preferred secondary access route. In Massachusetts, for example, IO is now a preferred administration over endotracheal (ET) drug administration. In fact, the American Heart Association no longer recommends using the endotracheal tube for resuscitation drugs since the efficacy is unclear. Paramedics may perform intraosseous infusion in a cardiac arrest patient if no vein is clearly visible. The IO is becoming more and more common in emergency medical services (EMS) systems around the world. Generally, any medication that can be introduced via IV can be introduced via IO. Because of this, adult IO systems (most of which use a mechanical or powered adjunct to place the catheter) have become more common across the United States in the prehospital setting. Intraosseous access has roughly the same absorption rate as IV access, and (unlike ET administration) allows for fluid resuscitation as well as high-volume drugs such as sodium bicarbonate to be administered in the setting of a cardiac arrest when IV access is unavailable. Endotracheal administration allows only specific drugs that have relatively low toxicity to lung tissue, and must be restricted to relatively low volumes to avoid drowning the patient. Due to the rapid advance and adoption of superior intraosseous access technology, IO access has now become the preferred method of establishing vascular access for patients in whom traditional access is difficult or impossible. This includes patients experiencing cardiac arrest, major trauma, airway compromise, severe dehydration, and/or hypoperfusion (shock). IO is also an alternative route for patients who typically have poor peripheral vasculature or challenging vascular access such as diabetics, renal patients, burn victims, IV drug users, obese patients, dehydrated patients, the very young or elderly patients, and others. Many EMS services and hospitals are now using IO as their first line solution for vascular access in both adult and pediatric cardiac arrest victims, enabling administration of lifesaving drugs much earlier than previously possible with traditional peripheral IV placement. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Intraosseous infusion」の詳細全文を読む スポンサード リンク
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