Variability in usual care fluid resuscitation and risk-adjusted outcomes for mechanically ventilated patients in shock

RATIONALE

There remains significant controversy regarding the optimal approach to fluid resuscitation for patients in shock. The magnitude of care variability in shock resuscitation, the confounding effects of disease severity and comorbidity, and the relative impact on sepsis survival are poorly understood.

OBJECTIVE

To evaluate usual care variability and determine the differential effect of observed and predicted fluid resuscitation volumes on risk-adjusted hospital mortality for mechanically ventilated patients in shock.

METHODS

We performed a retrospective outcome analysis of mechanically ventilated patients admitted to intensive care units using the 2013 Premier Hospital Database (Premier, Inc.). Observed and predicted hospital mortality were evaluated by observed and predicted day 1 fluid administration, using the difference in predicted and observed outcomes to adjust for disease severity between groups. Both predictive models were validated using a second large administrative database (Truven Health Analytics Inc.). Secondary outcomes included duration of mechanical ventilation, hospital and ICU length of stay, and cost.

RESULTS

Among 33,831 patients, observed hospital mortality was incrementally higher than predicted for each additional liter of day 1 fluid beginning at 7 L (40.9% vs. 37.2%, p = 0.008). Compared to patients that received expected (± 1.5 L predicted) day 1 fluid volumes, greater-than-expected fluid resuscitation was associated with increased risk-adjusted hospital mortality (52.3% vs. 45.0%, p < 0.0001) among all patients with shock and among a subgroup of shock patients with comorbid conditions predictive of lower fluid volume administration (47.1% vs. 41.5%, p < 0.0001). However, in patients with shock but without such conditions, both greater-than-expected (57.5% vs. 49.2%, p < 0.0001) and less-than-expected (52.1% vs. 49.2%, p = 0.037) day 1 fluid resuscitation were associated with increased risk-adjusted hospital mortality.

CONCLUSIONS

Highly variable day 1 fluid resuscitation was associated with a non-uniform impact on risk-adjusted hospital mortality among distinct subgroups of mechanically ventilated patients with shock. These findings support closer evaluation of fluid resuscitation strategies that include broadly applied fluid volume targets in the early phase of shock resuscitation.

What happens at the end of life? Using linked administrative health data to understand healthcare usage in the last year of life in New Zealand

The end of life is often associated with increased use of healthcare services. This increased use can include over-medicalisation, or over-treatment with interventions designed to cure that are likely futile in people who are dying. This is an issue with medical, ethical, and financial dimensions, and has implications for health policy, funding and the structure of care delivery. We measured the annual use of nine pre-defined public healthcare services between 1 January 2008 and 31 December 2012 by elderly New Zealanders (65-99 years old) in their last year of life and compared it with that of the cohort of elderly New Zealanders who used healthcare in the period but did not die. We used linked, encrypted unique patient identifiers to reorganise and filter records in routinely collected national healthcare utilisation and mortality administrative datasets. We found that, in New Zealand, people do seem to use more of most health services in their last year of life than those of the same age who are not in their last year of life. However, as they advance in age, particularly after the age of 90, this difference diminishes for most measures, although it is still substantial for days spent in hospital as an inpatient, and for pharmaceutical dispensings.