[Mechanical ventilation of morbidly obese patients in anaesthesia and intensive care]

Sedation options for the morbidly obese intensive care unit patient: a concise survey and an agenda for development

Background

We offer some perspectives and commentary on the sedation of obese patients in the intensive care unit (ICU).

Discussion

Sedation in morbidly obese patients should conform to the same broad principles now current in ICU practice. These include a general presumption against benzodiazepines as first-line agents. Opioids should be avoided in any situation where spontaneous breathing is required. Remifentanil is the preferred agent where continuous stable opioid levels using an infusion are required, because of its lack of context-sensitive accumulation. Volatile anaesthetics may be an option for the same reason but there are no substantial, controlled demonstrations of effectiveness/safety in short-term use in the ICU setting. Propofol is a valuable resource in the morbidly obese patients but the duration of continuous sedation should not exceed 6 days, in order to avoid propofol infusion syndrome. Alpha-2 agonists offer a range of theoretically positive features for the sedation of morbidly obese patients, but at present there is a lack of pharmacokinetic data and a critical mass of high-grade clinical data. Dexmedetomidine has the attraction of not causing respiratory depression or obstructive breathing during sedation and its sympatholytic effects should help deliver stable blood pressure and heart rate. Ketamine has a poor tolerability profile in adults so its use in the ICU context is largely confined to paediatrics.

Conclusion

None of the agents currently available is ideal for every situation encountered in the management of morbidly obese patients. This article identifies additional research needed to place sedation practice of obese patients on a more systematic footing.

[Emergency rescue XXL. Morbidly obese patient in the emergency medical service]

Obesity in Germany is becoming more and more prevalent. Significantly overweight patients (>200 kg) pose an increasing and difficult challenge for emergency medical services, emergency doctors and the hospitals responsible for further treatment. The anatomic and physiological characteristics of patients with extreme obesity must be taken into consideration, particularly the airway, breathing, circulation, disability, exposure and environment of the patient. Furthermore special preparations for medical supplies, concepts and strategies for transport and further treatment in hospital are required. Suitable equipment and coordinated processes are essential for both the safety of the persons involved and the patient's dignity. It is, however, a fact that many organizations and hospitals are poorly prepared for this challenge as the complete infrastructure of a hospital has to be adapted. Emergency transport in a bed should be avoided. Neighboring rescue services must be alarmed at an early stage if the commune concerned does not have adequate means of its own. Politics should guarantee cost-covering remuneration for hospitals and rescue services.