SummaryEmergency cricothyrotomy is a common feature in all difficult airway algorithms. It is the final step following a 'can't intubate, can't oxygenate' scenario. It is rarely performed and has a significant failure rate. There is variation in the reported size of the cricothyroid membrane, especially across population groups. Procedural failure may result from attempting to pass a device with too large an external diameter through the cricothyroid membrane. We aimed to determine the maximum height of the cricothyroid membrane in a UK trauma population. Electronic callipers were used to measure the maximum height of the cricothyroid membrane on 482 reformatted trauma computed tomography scans, 377 (78.2%) of which were in male patients. The mean (SD) height of the cricothyroid membrane, as independently measured by two radiologists, was 7.89 (2.21) mm and 7.88 (2.22) mm in male patients, and 6.00 (1.76) mm and 5.92 (1.71) mm in female patients. The presence of concurrent tracheal intubation or cervical spine immobilisation was found not to have a significant effect on cricothyroid membrane height. The cricothyroid membrane height in the study population was much smaller than that previously reported. Practitioners encountering patients who may require an emergency surgical airway should be aware of these data. Rescue airway equipment with variety of external diameters should be immediately available.

The World Health Organization have stressed the importance of nurses and midwives as a "force for health" in society's efforts to tackle the public health challenges of our time. The public health challenges are both diverse and complex. Principally, they emanate from a social model of health that takes cognizance of our behavior, our environment, and the historical, political, and cultural structures that facilitate health or militate against it. This paper provides a critical overview of public health nursing in Ireland, toward situating both our contribution to public health and some of the challenges that lie ahead of us. Specifically, it looks at nonquantifiable practice, where, through the presentation of stories, the wealth of public health nursing work is demonstrated in the ordinary voices of public health nurses. The potential risk of ignoring and minimizing the contribution of public health nursing in future developments in primary care in Ireland is discussed. Finally, it is proposed that public health nurses need to get political.

The wide variation in practice reflects inconsistencies in published guidance. Evidence-based consensuses of which patients to test and subsequent risk thresholds will aid clinicians identify those patients in which the risk of CI-AKI is clinically significant but manageable. There is also a need to determine the value of the various prophylactic strategies, follow-up regimen and efficient service delivery pathways. Advances in knowledge: This survey has identified that further work is required to define which patients are high risk, confirm those which require renal function testing prior to contrast administration and how best to manage patients at risk of CI-AKI. The role of new technologies within this service delivery pathway requires further investigation.

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