Newer Therapeutic Approaches to the Vasculitides: Biologic Agents

[Biologic therapies in the systemic vasculitides]

Several biological therapies have been evaluated in systemic vasculitis. Anti TNF-α agents may have a role in the treatment of Takayasu's arteritis and probably in giant cell arteritis. In Kawasaki's disease, infliximab is an option in subjects with intravenous immunoglobulin-resistant disease. Anti TNF-α cannot be recommended to treat ANCA-associated vasculitis. Anti-T lymphocyte globulin and alemtuzumab could have a role in the treatment of ANCA associated vasculitis, although current information about these two biological treatments comes from conventional resistant treatment cases, so the high incidence of complications and relapses observed with these treatment may be intrinsic to the severity of the disease and not related to the biological agents.

[Results of biological treatments in autoimmune diseases]

The use of the biological therapies has revolutionized in the last years the handling of numerous autoimmune processes. It has taken to numerous physicians and investigators to try to apply these therapies in other diseases (lupus, Sjögren, vasculitis, etc). From the introduction of corticosteroids and immunosupressives, vasculitis were no more a mortal diseases, and it was possible to obtain high rates of remission. Nevertheless, they are delayed, they are not sustained, and require of the use of maintained drugs. Against this background, the new biological drugs have to surpass the challenge to induce an earlier and permanent remission that diminishes irreversible organ damage, to reduce (or to eliminate) the exposition to steroids and immunesupressives and to improve the patient function. This article reviews data present until now in literature with respect to the utility of biological drugs in systemic vasculitis.

Difficult decisions in the intensive care unit: an illustrative case

Difficult clinical decision-making is a common experience in intensive care units. There is often considerable pressure on time and decisions may have to be made in a stressful environment. Patients in the intensive care unit not infrequently present with extreme or rare manifestations of a disease process. Clinical evidence to guide management of such patients may be incomplete, non-existent, or its relevance to the problem at hand may be questionable. In this context, formal decision-making analytical tools are often impractical. Unconscious cognitive biases have been shown to play an important role in medical decision-making, particularly in these settings. While mostly these contribute to doctors making appropriate and timely decisions, occasionally they lead to errors. Despite 30 years of research into models of clinical reasoning, most doctors are unaware of how biases affect their thinking and are unfamiliar with techniques of detecting and neutralising bias in clinical practice. We present the case of a patient with Wegener's granulomatosis, which highlights many of the difficulties outlined above. We review the clinical evidence for our decisions at each stage and explain the rationale for our choices, highlighting the many situations for which high quality evidence was lacking. Examples of cognitive bias are identified and techniques of metacognition (thinking about thinking) that can be useful in limiting the effects of bias on complex decision-making are reviewed. The intensivist's evaluation of management alternatives has an important role in steering medical management towards optimal patient outcomes.