Letter: i

Chronic pain that persists despite therapeutic interventions.

Literally, within a sheath. In anesthesia, refers to the subarachnoid space; within either the subarachnoid or subdural space.

Below the arachnoid mater. In anesthesia, refers to spinal anesthetic injections into the cerebrospinal fluid, which is contained within the subarachnoid space. SYN: subarachnoid space.

Peripheral venous access catheter: ? to 1 inch long for typical short stay IV access. Change every 3 days.

A functional area of the brainstem involved in the control of ventilation. This control area receives afferent impulses from peripheral receptors, integrates them with the functional state of the controlling neurons, and sends integrated command signals to the muscles of breathing. Ventilatory control oscillates, or alternates, between mutually antagonistic groups of nerve cells controlling the various muscles of breathing.

Microorganisms capable of producing disease in appropriate hosts.

Situated below and closer to the feet than another and especially another similar part of an upright body especially of a human being.

The pathological diffusion or accumulation in a tissue or cells of substances not normal to it or in amounts in excess of normal. Infiltration as it applies specifically to immune cells, occurs when white cells enter a region of the body in attempts to defend against infection or other invasive threat such as toxins, lint or debris.

Cellular or systemic response to physiological, chemical or biologic injury. Involves influx of fluids, white cells, dilated vessels (redness) and increased systemic and/or local temperature. Four fundamentals: redness, heat, swelling, and pain. Condition resulting from tissue response to injury or stimulation by noninfectious agents (e.g., thermal burns, chemicals, toxins).

A tissue reaction to injury or an antigen that may include pain, swelling, itching, redness, heat, and loss of function.