Ventilation time and prognosis after stroke thrombectomy: the shorter, the better!

BACKGROUND AND PURPOSE: The aim was to investigate the clinical impact of the duration of artificial ventilation in stroke patients receiving mechanical thrombectomy (MT) under general anaesthesia. METHODS: All consecutive ischaemic stroke patients who had been treated at our centre with MT for anterior circulation large vessel occlusion under general anaesthesia were identified over an 8-year period. Ventilation time was analysed as a continuous variable and patients were grouped into extubation within 6 h ('early'), 6-24 h ('delayed') and >24 h ('late'). Favourable outcome was defined as modified Rankin Scale scores of 0-2 at 3 months post-stroke. Pneumonia rate and reasons for prolonged ventilation were also assessed. RESULTS: Amongst 447 MT patients (mean age 69.1 ± 13.3 years, 50.1% female), the median ventilation time was 3 h. 188 (42.6%) patients had a favourable 3-month outcome, which correlated with shorter ventilation time (Spearman's rho 0.39, P < 0.001). In patients extubated within 24 h, early compared to delayed extubation was associated with improved outcome (odds ratio 2.40, 95% confidence interval 1.53-3.76, P < 0.001). This was confirmed in multivariable analysis (P = 0.01). A longer ventilation time was associated with a higher rate of pneumonia during neurointensive care unit/stroke unit stay (early/delayed/late extubation: 9.6%/20.6%/27.7%, P < 0.01). Whilst stroke-associated complications represented the most common reasons for late extubation (>24 h), delayed extubation (6-24 h) was associated with admission outside of core working hours (P < 0.001). CONCLUSIONS: Prolonged ventilation time after stroke thrombectomy independently predicts unfavourable outcome at 3 months and is associated with increased pneumonia rates. Therefore, extubation should be performed as early as safely possible.

Ventilator autotriggering : An underestimated phenomenon in the determination of brain death.

BACKGROUND: Ventilator autotriggering (VAT) may induce uncertainty in diagnosing brain death because it may falsely suggest a central respiratory drive in brain-dead patients where no intrinsic respiratory efforts exist. Since the lack of international standardization of brain death criteria contributes to the loss of potential donor organs, it is important to be aware of this phenomenon, which is a not well-known confounder in the process of diagnosing brain death. METHODS: The national official recommendations or guidelines for the determination of brain death and organ transplantation of 15 selected European countries (including all 8 member states of the Eurotransplant network) were evaluated with respect to VAT. In addition, a literature search (PubMed, Google Scholar) using the term "ventilator autotriggering", synonyms or similar content-related wording was carried out. RESULTS: The VAT phenomenon was mentioned in 3 of the 15 official recommendations and guidelines on diagnosing brain death. The causes and management of VAT are presented in different ways in the reviewed official recommendations and guidelines. CONCLUSION: The phenomenon of VAT is inconsistently addressed in the national guidelines and recommendations for the determination of brain death and should, therefore, be included in future harmonized brain death codes. Detection and correction of VAT should be implemented as early as possible by a structured procedure. Additional training and information on this phenomenon should be made available to the entire intensive care unit staff.