Does a distal perfusion cannula reduce ischaemic complications of extracorporeal membrane oxygenation?

BACKGROUND

Extracorporeal membrane oxygenation (ECMO) provides support to patients with severe but reversible cardiac or pulmonary failure. Vascular complications of ECMO are well recognized.

METHODS

We performed a retrospective review of 70 patients (mean age 48 years; 15-85) who received peripheral veno-arterial ECMO from 2004 to 2010 in a single centre. For statistical analysis, chi-squared test and multivariate binary logistic regression analysis were used to assess for association between response variables (i.e. limb ischaemia, ECMO site bleeding and deep vein thrombosis (DVT)) and possible predictive variables.

RESULTS

There were 14 (20%) cases of acute limb ischaemia with no statistically significant relationship between acute limb ischaemia and independent variables. Thirty-three patients received distal limb cannulas (47%). There was no statistically significant association between limb ischaemia and presence of distal limb cannula (P = 0.8). Multivariate binary logistic regression analysis identified insertion by cutdown as a predictor of lower probability of insertion site bleeding (n = 12, odds ratio 0.24, P = 0.04). Seven cases of DVT were identified; multivariate binary logistic regression analysis identified insertion by cutdown (odds ratio 0.08, P = 0.03) and days of ECMO less than five (odds ratio 0.08, P = 0.04) as predictive factors for reduced rates of DVT.

CONCLUSION

Ischaemic complications of ECMO are common and occur despite the presence of a distal limb-perfusing cannula; however in our study the distal limb cannula was a limb-salvaging intervention in six patients. Prolonged time on ECMO is a risk factor for DVT, and a high index of suspicion must be maintained. Percutaneous insertion was associated with higher rates of bleeding and DVT.

Increasing use of intraoperative cholangiogram in Australia: is it evidence-based?

BACKGROUND

The role of routine intraoperative cholangiograms (IOCs) for prevention of bile duct injury (BDI) is contentious. There are recent reports of limited utility of IOC in preventing BDI. In Australia, IOCs are used more frequently than internationally. This study aimed to evaluate the rate of IOC use in Australia and explore potential changes in practice in light of evolving evidence for the utility of IOC.

METHODS

Data were collated using service item numbers in Medicare Benefits Scheme records on the Australian Government Medicare website, for services claimed between 1 January 2001 and 31 December 2019. These data were used to analyse trends in rates of IOC, cholecystectomy and BDI repair. Data were age-standardized to account for changes in the population over time.

RESULTS

The number of IOCs claimed increased by 31.8% and cholecystectomies by 7.0% over the study period. Age-standardized service rates per 100 000 persons increased by 5.5 and 32.6, respectively. Rates of IOC per 100 000 cholecystectomies steadily increased across the study period, while BDI repair rates remained low and erratic.

CONCLUSION

Increasing use of IOC over the last 20 years reflects a trend towards routine rather than selective IOC; however, there is little discernible change in the number of BDIs requiring repair procedures. This suggests that routine IOC use to prevent or minimize BDI is unwarranted. Further investigation is required into the selective IOC use in high-risk patients rather than mandatory use in all patients.

Operative caseload of general surgeons working in a rural hospital in Central Australia

BACKGROUND

There is limited published data on the caseload of general surgeons in Central Australia. The region has a significant Indigenous population, who often face higher rates of chronic diseases and require more frequent surgical interventions compared to non-Indigenous individuals. This study aims to outline the workload of surgeons at Alice Springs Hospital to determine the necessary skill set and surgical education for future surgeons.

METHODS

A retrospective review of all general surgery operative cases performed in Central Australia, Alice Springs Hospital was conducted between January 2012 and December 2021. The RACS Morbidity Audit and Logbook Tool was used to classify surgical procedures along with Medicare Benefits Schedule item numbers. Tables were created to present the annual and specialty-specific data on the types and volumes of procedures.

RESULTS

From January 2012 to December 2021, 35 318 cases were performed, with 92.5% being general surgery, 3% plastics and reconstructive surgery and 2.8% vascular procedures. Indigenous patients received a higher proportion of procedures (50-60%) compared to non-Indigenous patients (30-50%). Common procedures included incision and drainage of abscesses and debridement of wounds, while trends across specialties showed a decline in ENT and plastic surgeries, stable thoracic and vascular cases, and increased numbers of urology operations.

CONCLUSION

General surgeons in rural centres must possess a wide range of skills and be capable of performing a variety of procedures. Trainees should be encouraged to consider practicing in rural areas, and those interested should account for the specific needs of the communities they plan to serve.

Investigating major trauma in Māori youth at Te Whatu Ora Counties Manukau

BACKGROUND

The Ninth Perioperative Mortality Review Committee (POMRC) report found the likelihood of death was over three times higher in Māori youth compared to non-Māori (age: 15-18 years) in the 30-days following major trauma. The aim of our study is to investigate variations in care provided to Māori youth presenting to Te Whatu Ora Counties Manukau (TWO-CM) with major trauma, to inform policies and improve care.

METHODS

This was a retrospective, observational study of 15-18-year-olds admitted to Middlemore Hospital from January 2018 to December 2021 following major trauma (Injury Severity Score (ISS) >12 or with (ISS) <12 who died). Data were obtained from the New Zealand Trauma Registry (NZTR). Six key performance indicators were studied against hospital guidelines/international consensus: Deaths, Cause-of-death, trauma call, RedBlanket activations, time-to-computed tomography (CT), and time-to-operating theatre (OT).

RESULTS

Of 77 patients, five deaths occurred, four non-Māori, and one Māori (P = 0.645). Five trauma calls were not activated (P = 0.642). There was no statistically significant difference for both median time to CT (P = 0.917) and time to CT for patients with GCS >13 (P = 0.778) between Māori and non-Māori. Five patients did not meet guidelines for time-to-OT (three non-Māori and two Māori) (P = 0.377).

CONCLUSION

No statistically significant variations in care were present for Māori youth presenting with major trauma, these findings did not match the national trend.

Decibels in the operating theatre: a study of noise levels during surgical procedures

BACKGROUND

Exposure to excessive noise volumes is an occupational health and safety risk. Australian guidelines recommend a time weighted exposure maximum of 85 dB (dB) or a maximum peak noise level of up to 140 dB, as chronic and repeated high dB exposure can result in significant hearing impairment. The aim of this study was to assess the volume of noise generated by common surgical instruments while utilizing the National Institute for Occupational Safety and Health (NIOSH) app.

METHODS

Sound levels were measured using the NIOSH app. The NIOSH app was used to take equivalent continuous A-weighted sound levels (LAeq) and the C-weighted peak sound pressure (LCpeak) measurements for specific instruments while in use in theatre. A minimum of three readings per instrument were taken at immediate and working distances.

RESULTS

LAeq measurements ranged from 62.9 to 89.3 dB. The Padgett Dermatome and Frazier Sucker exceeded recommended exposure limits with an averaged LAeq reading of 85.7 dB(A) and 85.1 dB(A) respectively. LCpeak readings ranged from 89.9 to 114.7 dB(C) with none of the instruments exceeding a peak sound level beyond the recommended level of 140 dB(C).

CONCLUSION

The cumulative effect of loud surgical instruments across prolonged or combined operations may result in theatre staff being exposed to hazardous noise levels, impacting the health and wellbeing of staff, staff performance and patient care. Utilization of a phone app can improve the awareness of noise pollution in theatres, thereby empowering staff to be proactive about their health and improvement of their work environment.

The effect of music on the operating surgeon: a pilot randomized crossover trial (the MOSART study)

OBJECTIVE

The experience of stress is common among surgeons while working in the operating theatre (OT). Understanding and finding ways to mitigate this stress is important for optimizing surgical quality and maintaining clinician wellbeing. In this pilot study, we tested the feasibility and reported the outcomes of measuring the effect of background music on intra-operative surgeon stress in the clinical environment.

METHODS

The effect of Music on the Operating Surgeon: A pilot Randomized crossover Trial (the MOSART study) was conducted over a 9-month period in a single-centre. Vascular and general surgeons acting as primary operators (POs) performing elective, general anaesthetic operations were included. The intervention was surgeon-selected music, and the control was the absence of music. Outcome measures were feasibility (recruitment rate, practicability, and completeness of data), heart rate variability (HRV) indices, the Six-Item State-Trait Anxiety Inventory (STAI-6), and the Surgical Task-load Index (SURG-TLX).

RESULTS

Five POs performed 74 eligible randomized cases. The protocol was well tolerated, and no cases were abandoned. Data was incomplete in 8% of cases. The overall mean (SD) operative SURG-TLX score was 48 (±22). Mean HR increased and RMSSD decreased significantly from baseline, suggesting reduced parasympathetic activity while operating. The presence of intra-operative music was not found to affect the psychological or physiological outcomes.

CONCLUSIONS

A music interventional study of this nature is feasible in the operating theatre environment, though no difference was found between in the music and non-music conditions. Follow-up research in a simulated environment with intensive physiological monitoring could be considered.