Chewing gum for the treatment of postoperative nausea and vomiting: a pilot randomized controlled trial.

BACKGROUND: A novel treatment, chewing gum, may be non-inferior to ondansetron in inhibiting postoperative nausea and vomiting (PONV) in female patients after laparoscopic or breast surgery. In this pilot study, we tested the feasibility of a large randomized controlled trial. METHODS: We randomized 94 female patients undergoing laparoscopic or breast surgery to ondansetron 4 mg i.v. or chewing gum if PONV was experienced in the postanaesthesia care unit (PACU). The primary outcome was full resolution of PONV, with non-inferiority defined as a difference between groups of <15% in a per protocol analysis. Secondary outcomes were PACU stay duration, anti-emetic rescue use, and acceptability of anti-emetic treatment. The feasibility of implementing the protocol in a larger trial was assessed. RESULTS: Postoperative nausea and vomiting in the PACU occurred in 13 (28%) ondansetron patients and 15 (31%) chewing gum patients (P=0.75). Three chewing gum patients could not chew gum when they developed PONV. On a per protocol basis, full resolution of PONV occurred in five of 13 (39%) ondansetron vs nine of 12 (75%) chewing gum patients [risk difference 37% (6.3-67%), P=0.07]. There was no difference in secondary outcomes between groups. Recruitment was satisfactory, the protocol was acceptable to anaesthetists and nurses, and data collection was complete. CONCLUSIONS: In this pilot trial, chewing gum was not inferior to ondansetron for treatment of PONV after general anaesthesia for laparoscopic or breast surgery in female patients. Our findings demonstrate the feasibility of a larger, multicentred randomized controlled trial to investigate this novel therapy. CLINICAL TRIAL REGISTRATION: Australian New Zealand Clinical Trials Registry: ACTRN12615001327572.

The minimal leak test technique for endotracheal cuff maintenance.

Endotracheal tube (ETT) cuff pressure management is an essential part of airway management in intubated and mechanically ventilated patients. Both under- and over-inflation of the ETT cuff can lead to patient complications, with an ideal pressure range of 20-30 cmH2O defined. A range of techniques are employed to ensure adequate ETT cuff inflation, with little comparative data. We performed an observational cross-sectional study in a tertiary metropolitan ICU, assessing the relationship between the minimal leak test and cuff manometry. Forty-five mechanically ventilated patients, over a three-month period, had ETT cuff manometry performed at the same time as their routine cuff maintenance (minimal leak test). Bedside nurse measurements were compared with investigator measurements. At the endpoint of cuff inflation, 20 of 45 patients (44%) had cuff pressures between 20 and 30 cmH2O; 11 of 45 patients (24%) had cuff pressures <20 cmH2O; 14 of 45 patients (31%) had cuff pressures ≥30 cmH2O. Univariate analysis demonstrated an association between both patient obesity and female gender requiring less ETT cuff volume (P=0.008 and P <0.001 respectively), though this association was lost on multivariate analysis. No association was demonstrated between any measured variables and cuff pressures. Inter-operator reliability in performing the minimal leak test showed no evidence of bias between nurse and investigators (Pearson coefficient = 0.897). We conclude the minimal leak test for maintenance of ETT cuffs leads to both over- and under-inflation, and alternative techniques, such as cuff manometry, should be employed.

Feasibility and acceptability of remotely monitored pedometer-guided physical activity.

Nearly 70% of the Australian adult population are either sedentary, or have low levels of physical activity. There has been interest in addressing this problem by the 'mHealth', or mobile Health, arena, which is concerned with the confluence of mobile technology and health promotion. The newer generation of activity pedometers has the ability to automatically upload information, to enable aggregation and meta-data analysis of individual patient data. We conducted a ten-week pilot trial of the Fitbit Zip® pedometer using a validated tool in ten volunteers, finding it highly acceptable to both participants and investigators. Data synching was ranked as 'very easy' or 'easy' by all participants, and investigators could successfully monitor activity levels remotely. Median (interquartile range) daily step counts of participants over the ten-week trial ranged from 5471 (4591-7026) to 18779 (15031-21505) steps. Sedentary time over the study period ranged from 1.4% to 33.3% of study days. Percentage of days reaching the target activity level of >10,000 steps/day varied markedly between participants from 4.5% to 95.7%. This study demonstrates the feasibility and acceptability of a remotely monitored pedometer-guided physical activity intervention. This technology may be useful to encourage increased exercise as a form of 'prehabilitation' of adequately screened at-risk surgical or obstetric patients.

Impact of increasing overnight intensive care unit registrar staffing on duration of intubation of elective cardiac surgery patients.

It is unclear whether increases to overnight junior medical staffing levels can improve ICU patient outcomes. We conducted a retrospective cohort study before and after the introduction of a third overnight ICU registrar at a 24-bed metropolitan ICU in February 2012. We hypothesised that this change would be associated with decreased intubation time for elective cardiac surgery patients and an increase in the proportion of these patients being extubated during the overnight period. All elective cardiac surgery patients were included from two temporally matched six-month periods (May to October) in 2011 and 2012. The primary outcome was median duration of intubation, and the secondary outcome was proportion of patients extubated during the 'overnight' period (2200 to 0700). A total of 142 and 188 patients were included in the control and intervention cohorts, respectively. Median (IQR) intubation time was 8.7 (6.6 to 14.5) hours in the control cohort and 8.2 (6.0 to 13.4) hours in the intervention cohort, with no significant difference between groups (P=0.40). The proportion of elective cardiac surgery patients extubated during the overnight period was similar, 54.2% in the control group compared to 50.0% in intervention group (P=0.45). In our unit, increasing overnight ICU registrar staffing levels was not associated with a significant reduction in duration of intubation for elective cardiac surgery patients or a reduction in the proportion of these patients extubated overnight. This is likely due to factors other than medical staffing levels influencing timing of extubation of these patients.

Platypnoea-orthodeoxia syndrome post laparoscopic surgery in a patient with a patent foramen ovale.

Platypnoea-orthodeoxia syndrome has the pathognomonic clinical findings of dyspnoea and arterial hypoxaemia relieved by recumbency. We report on a patient who presented with platypnoea-orthodeoxia syndrome post laparoscopic surgery. Platypnoea-orthodeoxia syndrome is an important diagnosis to consider when investigating hypoxia without an obvious cause.