Inotropic drugs and their uses in critical care

Time delays associated with vasoactive medication preparation and delivery in simulated patients at risk of cardiac arrest

PURPOSE

To compare, quantify, and describe the time-delays associated with four common methods of adrenaline administration in the simulated setting of impending cardiac arrest.

METHODS

Using sham medication and a high-fidelity simulator, experienced Nurses prepared, then delivered, adrenaline by: i) bolus, ii) lower-concentration infusion iii) higher-concentration infusion, and iv) higher-concentration infusion plus carrier-line. We recorded medication preparation and delivery time, plus administration errors and self-reported competence.

RESULTS

Median total delay was i) 120s for bolus (95% CI 112-128s); ii) 179s for lower concentration infusion (95% CI 172-186s); iii) 296s for higher concentration infusion (95% CI 285-307s); and iv) 411s for higher concentration infusion plus carrier line (95% CI 399-423s). Time to prepare/deliver a bolus was less than any infusion (p<0.001). Time to prepare/deliver a lower-concentration infusion was less than either higher-concentration infusion (p<0.001). No substantial equipment failures or medication errors were observed. Participants reported high-competence. The majority of delay was from drug preparation not delivery.

CONCLUSIONS

We highlight potentially dangerous delays with administration of life-saving medications by all four methods. We should prioritize boluses, and focus on improving drug preparation times and human performance, more than drug delivery and equipment.

Assessment and management of the septic patient: part 2

Sepsis has gained increasing publicity in recent years, and there is now a strong focus of clinical education and training following the Surviving Sepsis Campaign. The assessment and management of a septic patients is far from simple and requires a systematic approach in both identifying and managing the condition. This second part explores sepsis care bundles and the research that underpins each of the interventions. These discussions will enable nurses to understand why each component of the sepsis care bundle is important and thus enable them to rapidly prioritise care, as early effective interventions have been shown to optimise patient outcomes.

Cardiac power index: staging heart failure for mechanical circulatory support

Cardiac power output has been shown to quantify cardiac reserve. Cardiac reserve is defined as the difference between basal and maximal cardiac performance. We compared cardiac power index to other commonly used hemodynamic parameters to validate its usefulness to stage heart failure patients and determine the optimal time for implantation of mechanical circulatory support. A retrospective study of twenty-eight heart failure patients implanted with mechanical circulatory support was analyzed at three levels of drug therapy. Subjects were further separated into two categories: survived versus deceased. Cardiac power index was the only statistically significant hemodynamic parameter that identified cardiac reserve (p<0.05) in this patient population. These results showed that a cardiac power index at or below 0.34 Watts/m(2) resulted in increased mortality rate, ninety days post-implantation.

CONCLUSION

Cardiac reserve was a determinant of post-device survival; therefore, these data suggest that device implantation should occur prior to the 0.34 Watts/m(2) threshold.