Image-guided Radiotherapy Of Esophageal Cancer By Helical Tomotherapy: Acute Toxicity And Preliminary Clinical Outcome

Background

Helical tomotherapy is a novel intensity-modulated radiotherapy modality with a helical 360° radiation delivery system and CT imaging ability. The purpose of this report is to review our initial experiences and to assess the toxicity and efficacy of helical tomotherapy for esophageal cancer.

Methods

Twenty patients with locally advanced esophageal cancer (T3-4 and/or N+ and/or M1a/b) were treated with helical tomotherapy. Radiotherapy included simultaneous 50 Gy to gross tumorous areas and 45 Gy to areas of suspected subclinical disease. All received combination chemotherapy. Ten patients underwent surgical resection after completion of chemoradiation. Ten patients were ineligible for surgery.

Results

The treatment was well-tolerated. There were no treatment-related deaths or Grade 4 toxicity. Grade 3 toxicities were noted in 9 of 20 patients (45%). Down-staging was noted in 7 of 10 patients (70%) who underwent surgery. The median follow-up time was 24.5 months. Eight patients, including 3 with surgery and 5 without surgery, have died. The 1-year overall survival rates for the entire group, patients with and without surgical resection are 80.0%, 100.0% and 60.0% respectively (log-rank p = 0.244, surgery versus no surgery).

Conclusions

The regimen of combined chemoradiation by helical tomotherapy for locally advanced esophageal cancer is well-tolerated. The toxicity profile compares favorably with that of protocols based on conventional approach and the preliminary indications of efficacy are encouraging.     

Sex differences in resource use after on-pump and off-pump coronary artery bypass surgery: A propensity score-matched cohort

BACKGROUND:

Previous studies have demonstrated that off-pump coronary artery bypass surgery (OPCAB) is associated with less use of hospital resources compared with on-pump coronary artery bypass surgery (ONCAB).

OBJECTIVE:

To determine whether there is a sex effect between the two procedures regarding resource utilization.

METHODS:

Between 1996 and 2004, 13,522 patients (10,637 men and 2885 women) underwent coronary artery bypass grafting surgery at the Toronto General Hospital (Toronto, Ontario). Among the men, 10,121 patients underwent ONCAB and 516 underwent OPCAB. The female population consisted of 2723 ONCAB and 162 OPCAB patients. Both groups were matched to standard preoperative risk factors. A propensity score macro-matched 471 OPCAB men to 471 ONCAB men, and 148 OPCAB women to 148 ONCAB women.

RESULTS:

The mean (± SD) postoperative length of stay (7.5±6.5 days versus 6.4±5.5 days; P<0.0001) was significantly higher in ONCAB compared with OPCAB in the male population. The mean length of stay in the intensive care unit and the mean ventilation time was similar between the groups. However, in the female population, there were no differences in mean posoperative length of stay (8±5.9 days versus 8±6 days; P=0.4), mean length of stay in the intensive care unit (43±38 h versus 53±81 h; P=0.4) or mean ventilation time (9.8±9.7 h versus 11±13 h; P=0.8).

CONCLUSION:

These results suggest that the benefits of OPCAB in terms of hospital resource use are influenced by sex. The potential beneficial effects are not demonstrated in the female population.     

Effect of Exercise on Blood Pressure in Type 2 Diabetes: A Randomized Controlled Trial

BACKGROUND

Increased blood pressure (BP) in type 2 diabetes (T2DM) markedly increases cardiovascular disease morbidity and mortality risk compared to having increased BP alone.

OBJECTIVE

To investigate whether exercise reduces suboptimal levels of untreated suboptimal BP or treated hypertension.

DESIGN

Prospective, randomized controlled trial for 6 months.

SETTING

Single center in Baltimore, MD, USA.

PATIENTS

140 participants with T2DM not requiring insulin and untreated SBP of 120–159 or DBP of 85–99 mmHg, or, if being treated for hypertension, any SBP <159 mmHg or DBP < 99 mmHg; 114 completed the study.

INTERVENTION

Supervised exercise, 3 times per week for 6 months compared with general advice about physical activity.

MEASUREMENTS

Resting SBP and DBP (primary outcome); diabetes status, arterial stiffness assessed as carotid-femoral pulse-wave velocity (PWV), body composition and fitness (secondary outcomes).

RESULTS

Overall baseline BP was 126.8 ± 13.5 / 71.7 ± 9.0 mmHg, with no group differences. At 6 months, BP was unchanged from baseline in either group, BP 125.8 ± 13.2 / 70.7 ± 8.8 mmHg in controls; and 126.0 ± 14.2 / 70.3 ± 9.0 mmHg in exercisers, despite attaining a training effects as evidenced by increased aerobic and strength fitness and lean mass and reduced fat mass (all p < 0.05), Overall baseline PWV was 959.9 ± 333.1 cm/s, with no group difference. At 6-months, PWV did not change and was not different between group; exercisers, 923.7 ± 319.8 cm/s, 905.5 ± 344.7, controls.

LIMITATIONS

A completion rate of 81 %.

CONCLUSIONS

Though exercisers improve fitness and body composition, there were no reductions in BP. The lack of change in arterial stiffness suggests a resistance to exercise-induced BP reduction in persons with T2DM.KEY WORDS: exercise training, diabetes, high blood pressure, randomized trial     

Foot Technology, Part 1 of 2: Association between Foot Temperature and Sudomotor Dysfunction in Type 2 Diabetes

Background and Aims

Increased foot skin temperature has been described as a feature of diabetic neuropathy. The aim of this present study was to investigate the association between foot temperature and sudomotor dysfunction in type 2 diabetes mellitus.

Patients and Methods

This study included 51 patients (group A: 25 men, mean age 61.14 ± 6.11 years) without sudomotor dysfunction and 52 patients (group B: 25 men, mean age 59.54 ± 6.18 years) with sudomotor dysfunction. Sudomotor dysfunction was defined as time until complete Neuropad^® color change from blue to pink exceeding 600 s in at least one foot. Time until complete color change of the test was also recorded. Foot skin temperature was measured with a handheld infrared thermometer on the plantar aspect of the foot at the level of the first metatarsal head.

Results

On both feet, temperature was significantly higher in group B than in group A (right foot, group A versus group B, 30.62 ± 1.13 °C versus 32.12 ± 1.06 °C, p < .001; left foot, group A versus group B, 30.65 ± 1.06 °C versus 32.19 ± 1.10 °C, p < .001). There was a significant positive correlation between time to complete Neuropad color change and foot skin temperature (right foot, r = 0.742, p < .001; left foot, r = 0.758, p < .001), which was confirmed in both groups.

Conclusions

Patients with sudomotor dysfunction have significantly higher foot temperature than those without sudomotor dysfunction. Foot temperature is positively correlated with severity of sudomotor dysfunction, as evaluated by the time to complete Neuropad color change.     

Mid-term outcomes of off-pump versus on-pump coronary artery bypass graft surgery

OBJECTIVE:

To evaluate survival and readmissions to hospital for cardiac events or coronary revascularization (REVASC) in patients having off-pump (OPCAB) versus conventional on-pump (CCAB) coronary artery bypass graft surgery (CABG).

METHODS:

Of 11,368 consecutive patients undergoing isolated CABG between 1996 and 2002, 514 had OPCAB surgery. Using propensity scores, 503 CCAB patients were randomly matched to 503 OPCAB patients.

RESULTS:

There were no clinical or statistical differences between the two groups for any prognostic variable. However, OPCAB patients received significantly fewer distal anastomoses than the CCAB group (2.6±1.0 versus 3.1±1.0; P<0.001). There was no difference in operative mortality (OPCAB 1.0%, CCAB 1.4%; P=0.6), but the OPCAB group had significantly fewer operative strokes (0.2% versus 1.8%; P=0.01). Follow-up was 99.7% complete at 2.2±1.2 years (range 0 to 6 years). Twice as many OPCAB patients (n=24) required REVASC compared with the CCAB (n=11) group. The following five-year actuarial outcomes are presented for CCAB and OPCAB, respectively: survival: 77±6%, 76±8%, P=0.8; freedom from REVASC: 95±3%, 92±2%, P=0.02; and cardiac event-free survival: 76±5%, 62±8%; P=0.05. Cox regression revealed that OPCAB was a significant independent predictor of poorer freedom from REVASC (RR 2.2, 95% CI 1.0 to 4.6; P=0.04) and cardiac event-free survival (RR 1.6, 95%CI 1.1 to 2.2; P=0.02).

CONCLUSIONS:

The use of OPCAB remains controversial. These results, from this early experience, suggest that despite improved hospital outcomes, the lesser degree of REVASC raises concerns about the need for repeat revascularization in the OPCAB group.     

Renal effects of long-term treatment with 5-aminosalicylic acid

BACKGROUND:

A number of case reports link the use of 5-aminosalicylic acid (5-ASA) to interstitial nephritis in patients with inflammatory bowel disease (IBD).

OBJECTIVE:

To investigate whether the long-term use of 5-ASA has harmful effects on renal function in patients with IBD.

METHODS:

A retrospective analysis of 171 consecutive outpatients with Crohn’s disease or ulcerative colitis was conducted. Serum creati-nine levels and body weight were measured before and after treatment to calculate the creatinine clearance (CrCl) rate.

RESULTS:

In 171 patients (93 women, 78 men), the mean (± SD) dose of 5-ASA was 3.65±0.85 g/day with a cumulative dose of 11±7.7 kg over an interval of 8.4±5.9 years. Serum creatinine concentrations increased from 76.8 μmol/L to 88.7 μmol/L (n=171; P<0.0001) and the CrCl rate fell significantly from 104.6 mL/min to 93.1 mL/min (n=81; P<0.0001). There was one case of interstitial nephritis reported. Treatment groups included mesalamine (74.3%), sulfasalazine (15.2%) and combination (sulfalsalazine/mesalamine [10.5%]) with treatment durations of 7.2±4.5, 12.3±8.7 and 11.2±6.7 years, respectively. The duration of treatment was the most important covariate for change in CrCl and when analyzed by treatment group, those treated with sulfasazine had a strong correlation (r=−0.54, P=0.0145), while nonsignificant in the mesalamine group (r=0.06, P=0.7017). The decline in CrCl was negatively correlated with the pretreatment CrCl rate (r=−0.34; P=0.0024) and positively correlated with the mean daily dose of 5-ASA (r=0.32; P=0.0034).

CONCLUSION:

The present study is the first to demonstrate a significant dose- and treatment duration-dependant decline in CrCl. The risks need to be further evaluated because 5-ASA is widely used for long-term maintenance therapy in patients with IBD.     

Comparison of oxygenation in peripheral muscle during submaximal aerobic exercise, in persons with COPD and healthy, matched-control persons

Objective

The purpose of this study was to compare peripheral muscle oxygenation in persons with chronic obstructive pulmonary disease (COPD) to healthy control persons, during submaximal exercise.

Methods

Eight persons with COPD (forced expiratory volume in one second [FEV₁] = 1.00 ± 0.27 L) and eight healthy control persons (FEV₁ = 1.88 ± 0.55L) performed a submaximal graded exercise test (GXT), and completed 4 min of constant load exercise (CON) at 50% of peak GXT. Measurements included oxygen uptake, heart rate, arterial oxygen saturation and peripheral muscle oxygenation (%StO₂) at rest, during exercise, and recovery.

Results

Significantly greater workloads were attained for controls compared with COPD for peak GXT and CON. No significant differences in %StO₂ were observed between groups at: rest (GXT: 29.5 ± 22.8 vs 30.4 ± 17.3%; CON: 33.3 ± 15.4 vs 35.1 ± 17.2%); peak GXT (29.4 ± 19.4 vs 26.5 ± 15.9%); 4 min of CON (25.9 ± 13.5 vs 34.5 ± 21.8%); and recovery (GXT: 46.6 ± 29.1 vs 44.3 ± 21.7%; CON: 40.9 ± 21.5 vs 44.5 ± 23.2%).

Conclusion

These results suggest that peripheral skeletal muscle oxygenation is not compromised in COPD during submaximal exercise, and limitations in exercise capacity are most likely a result of muscle disuse and poor lung function.     

Effects of aerobic exercise training and irbesartan on blood pressure and heart rate variability in patients with chronic obstructive pulmonary disease

BACKGROUND AND OBJECTIVES:

The present pilot study was undertaken to evaluate the efficacy of an aerobic exercise training (AET) program alone or combined with an antihypertensive agent (irbesartan) to reduce blood pressure (BP) and enhance heart rate variability (HRV) in chronic obstructive pulmonary disease patients.

METHODS:

Twenty-one patients were randomly assigned to a double-blind treatment with exercise and placebo (n=11) or exercise and irbesartan (n=10). Subjects underwent 24 h BP monitoring and 24 h electrocardiographic recording before and after the 12-week AET. HRV was investigated using three indexes from the power spectral analysis and three indexes calculated from the time domain. The AET program consisted of exercising on a calibrated ergocycle for 30 min three times per week. Five patients in the placebo group were excluded during follow-up because they were not compliant.

RESULTS:

There was no change in 24 h systolic and diastolic BP before (130±14 mmHg and 70±3 mmHg, respectively) and after (128±8 mmHg and 70±8 mmHg, respectively) exercise training in the placebo group, whereas in the irbesartan group systolic and diastolic BP decreased from 135±9 mmHg and 76±9 mmHg to 126±12 mmHg and 72±8 mmHg, respectively (P<0.02). There were no changes in HRV parameters in either group.

CONCLUSIONS:

The present study suggests that a 12-week AET program is not associated with a significant reduction in BP or enhancement in HRV, whereas an AET program combined with irbe-sartan is associated with a reduction in 24 h BP.     

Short-term results of thoracoscopic lobectomy and segmentectomy for lung cancer in koo foundation sun yat-sen cancer center

Background

Thoracoscopic lobectomy and segmentectomy have been demonstrated to be safe and technically feasible for curative resection of lung cancer. This minimally invasive surgery is increasingly popular and adopted by the world all over. We report our short-term results of thoracoscopic lobectomy/segmentectomy operations comparing with previous surgical approach for lung cancer resection by muscle-sparing vertical minithoracotomy in Koo Foundation Sun Yat-Sen Cancer Center.

Methods

We performed a retrospective review of 317 consecutive patients who underwent lobectomy or segmentectomy either by thoracoscopic surgery (n=121) or muscle-sparing vertical mini-thoracotomy (n=195) for lung cancer in Koo Foundation Sun Yat-Sen Cancer center between Jan 2000 and Jun 2009. The operative details, postoperative complication, and length of stay were statistically analyzed.

Results

Thoracoscopic lobectomy and segmentectomy were performed successfully in 121 patients. One patient was converted to open thoracotomy during operation due to uncontrolled bleeding. There is no significant difference in age factors (p=0.763), forced expiratory volume in one second (p=0.480) or comorbidities (p=0.549) between these two groups. Thoracoscopic group had a significantly predominant percentage in women, diabetes mellitus, less smoking index and chronic obstructive pulmonary disease incidence. Patients undergoing a thoracoscopic surgery had a shorter length of stay (6.8±3.4 vs. 10.2±9.1 days, p<0.001), longer operative time (3.6±1.0 vs. 3.2±1.2 hours, p=0.004), and less blood loss (102.7±95.7 vs. 140.1±171.2 ml, p<0.029). There was no significant difference in postoperative complication rate between the two groups (18.2% vs. 23.6%, p=0.255). No surgical mortality was found in the thoracoscopic group.

Conclusions

Our findings suggested thoracoscopic surgery for lung cancer would be as safe as muscle-sparing vertical mini-thoracotomy in lobectomy and segmentectomy.     

Recovery and recurrence of left ventricular systolic dysfunction in patients with idiopathic dilated cardiomyopathy

BACKGROUND:

Some patients with nonischemic left ventricular (LV) systolic failure recover to have normal LV systolic function. However, few studies on the rates of recovery and recurrence have been reported, and no definitive indicators that can predict the recurrence of LV dysfunction in recovered idiopathic dilated cardiomyopathy (IDCMP) patients have been determined. It was hypothesized that patients who recovered from nonischemic LV dysfunction have a substantial risk for recurrent heart failure.

METHODS:

Forty-two patients (32 men) with IDCMP (mean [± SD] age 56.9±8.7 years) who recovered from systolic heart failure (LV ejection fraction [LVEF] of 26.5±6.9% at initial presentation) to a near-normal state (LVEF of 40% or greater, and a 10% increase or greater in absolute value) were monitored for recurrence of LV systolic dysfunction. Patients with significant coronary artery disease were excluded. Patients were monitored for 41.0±26.3 months after recovery (LVEF 53.4±7.6%) from LV dysfunction.

RESULTS:

LV systolic dysfunction reappeared (LVEF 27.5±8.1%) during the follow-up period in eight of 42 patients (19.0%). No significant difference between the groups with or without recurrent heart failure was observed in the baseline clinical and echocardiographic characteristics. However, more patients in the recurred IDCMP group than those in the group that maintained the recovery state had discontinued antiheart failure medication (62.5% versus 5.9%, P<0.05).

CONCLUSIONS:

LV dysfunction recurs in some patients with reversible IDCMP. The recurrence was significantly correlated with the discontinuation of antiheart failure drugs. The results suggest that continuous medical therapy may be mandatory in patients who recover from LV systolic dysfunction.     

Tibolone inhibits aortic atherosclerotic lesionformation in oophorectomized cholesterol-fed rabbits

BACKGROUND:

Tibolone is a synthetic steroid effective for the treatment of climacteric symptoms and osteoporosis. Long term treatment with tibolone is associated with a significant decrease in cholesterol levels due to a parallel decrease in high-density lipoprotein. However, the effect of these changes on atherogenesis is not known.

OBJECTIVE:

To investigate the effect of tibolone therapy on aorta atherogenesis.

MATERIAL AND METHODS:

Thirty-two New Zealand white rabbits were fed cholesterol-rich feed and studied for four months. The rabbits underwent laparotomy and were randomly assigned to four groups. Twenty-four rabbits underwent bilateral ovariectomy; of these, eight received tibolone (group T), eight received estradiol valerate (group E), eight received placebo after sterilization (group C), and eight were sham operated (group S).

RESULTS:

After receiving the cholesterol-rich diet, total levels of cholesterol increased in group C from 3.17±0.72 mmol/L to 35.36±9.01 mmol/L, in group S from 2.88±0.9 mmol/L to 28.76±9.442 mmol/L, in group E from 1.69±0.44 mmol/L to 1.69±0.44 mmol/L and in group T from 2.03±0.22 mmol/L to 26.33±13.45 mmol/L (no significant differences were observed among the groups at the end of the study). At four months, the cholesterol- rich diet caused atherosclerotic lesions in both treated and untreated rabbits, affecting 30.47±12.2%, 24.51±16.1%, 17.91±10.19% and 10.21±6.8% of the aortic surface for groups C, S, E and T, respectively (P<0.01 for treated groups).

CONCLUSION:

The principal result from this study was that treatment with tibolone in cholesterol-fed ovariectomized rabbits reduces aortic atherosclerotic lesion formation and that this reduction is not related to plasma lipid levels.     

Comparison of the effects of different magnesium administration times on infarct size

BACKGROUND:

The protection of high magnesium on infarct size remains controversial.

OBJECTIVE:

To examine the effects of magnesium administered before ischemia or early in reperfusion on infarct size in a rat model of global ischemia

METHODS:

Isolated rat hearts were submitted to 40 min of normothermic global ischemia and 2 h of reperfusion. After 20 min of stabilization, four protocols were performed: ischemic control (IC) hearts; 15 mM of magnesium chloride administered 15 min before ischemia (MgI); 15 mM of magnesium chloride administered during the first 15 min of reperfusion (MgR); or 15 mM magnesium plus 5 mM calcium (Mg+Ca) before ischemia. Infarct size was measured by triphenyltetrazolium staining. Contractile function was assessed by left ventricular developed pressure and the maximal velocity of rise of left ventricular presssure.

RESULTS:

The infarct size in IC hearts was 44±5%. In MgI and MgR hearts, the infarct diminished to 4.5±1.5% and 18±4%, respectively. In Mg+Ca hearts, the protection was also obtained (19±3%). Myocardial function also improved significantly by magnesium treatment. At the end of reperfusion, left ventricular developed pressure and maximal velocity of rise of left ventricular pressure values were 23±6% and 22±3% in MgI; and 10±3% and 9±2.6% in MgR versus 2±0.7% and 2.3±0.8% in IC hearts, respectively.

CONCLUSION:

The treatment with magnesium either before ischemia or early in reperfusion has an infarct size limiting effect in a model of global ischemia. This protective effect is partially due to its calcium antagonistic action.     

Therapeutic efficacy of different types of platelet concentrates in thrombocytopenic patients

Background

Platelet Rich Plasma-Platelet concentrate (PRP-PC), Buffy Coat poor-platelet concentrate (BCPC), and Apheresis — PC were prepared and their therapeutic efficacy were assessed in thrombocytopenic patients.

Study design and methods

PRP-PC and BC-PC were prepared from whole blood and Apheresis-PC by automated cell separator. The post transfusion efficacy of transfused platelets was assessed at 1 hour and 20 hours by corrected count increment (CCI) and percentage recovery (PR).

Results

A total of 60 patients’ (20 each for PRP-PC, BC-PC and Apheresis-PC) were enrolled in this study. Forty one patients received therapeutic and nineteen received prophylactic transfusion support. Patients with aplastic anemia 43% (25/60) and acute leukemia 38% (23/60) formed a majority of study population. Platelet dosage of patients’ received PRP-PC, BC-PC and apheresis-PC were 2.4±0.82 × 1011 (mean±SD), 2.2±0.83 × 1011 (mean±SD) and 4.14±1.82 × 1011 (mean±SD) and ranged from 1.16–4.11 × 1011, 1.04−4.20 × 1011 and 1.22−8.90 × 1011 respectively. There was significantly increase in inter-transfusion interval with Apheresis-PC than with PRP-PC and BC-PC recipients [(Mean±S.D.), 4.7±1.33 days Vs 2.7±0.82 days Vs 2.5±0.7 days respectively] (p < 0.05).

Conclusions

Patients transfused with apheresis-PC had received higher platelet dosage than PRP-PC and BC-PC and this difference was statistically significant (p < 0.001). The post transfusion platelet counts and increments at 1 hour and 20 hours were significantly higher with apheresis-PC than PRP-PC and BC-PC (p < 0.001). However, the corrected count increment (CCI) and percentage recovery (PR) in all three groups were comparable. There was significantly increase in inter-transfusion interval with apheresis-PC than PRPPC and BC-PC (p < 0.05).     

The effect of heartburn and acid reflux on the severity of nausea and vomiting of pregnancy

BACKGROUND:

Heartburn (HB) and acid reflux (RF) in the non-pregnant population can cause nausea and vomiting; therefore, it is plausible that in women with nausea and vomiting of pregnancy (NVP), HB/RF may increase the severity of symptoms.

OBJECTIVE:

To determine whether HB/RF during pregnancy contribute to increased severity of NVP.

METHODS:

A prospectively collected cohort of women who were experiencing NVP and HB, RF or both (n=194) was studied. The Pregnancy-Unique Quantification of Emesis and Nausea (PUQE) scale and its Well-being scale was used to compare the severity of the study cohort’s symptoms. This cohort was compared with a group of women experiencing NVP but no HB/RF (n=188). Multiple linear regression was used to control for the effects of confounding factors.

RESULTS:

Women with HB/RF reported higher PUQE scores (9.6±2.6) compared with controls (8.9±2.6) (P=0.02). Similarly, Well-being scores for women experiencing HB/RF were lower (4.3±2.1) compared with controls (4.9±2.0) (P=0.01). Multiple linear regression analysis demonstrated that increased PUQE scores (P=0.003) and decreased Well-being scores (P=0.005) were due to the presence of HB/RF as opposed to confounding factors such as pre-existing gastrointestinal conditions/symptoms, hyperemesis gravidarum in previous pregnancies and comorbidities.

CONCLUSION:

The present cohort study is the first to demonstrate that HB/RF are associated with increased severity of NVP. Managing HB/RF may improve the severity of NVP.     

The 1918 influenza pandemic in New York City: age‐specific timing,mortality, and transmission dynamics

Background

The 1918 influenza pandemic caused disproportionately high mortality among certain age groups. The mechanisms underlying these differences are not fully understood.

Objectives

To explore the dynamics of the 1918 pandemic and to identify potential age-specific transmission patterns.

Methods

We examined 1915–1923 daily mortality data in New York City (NYC) and estimated the outbreak duration and initial effective reproductive number (R_e) for each 1-year age cohort.

Results

Four pandemic waves occurred from February 1918 to April 1920. The fractional mortality increase (i.e. ratio of excess mortality to baseline mortality) was highest among teenagers during the first wave. This peak shifted to 25- to 29-year-olds in subsequent waves. The distribution of age-specific mortality during the last three waves was strongly correlated (r = 0·94 and 0·86). With each wave, the pandemic appeared to spread with a comparable early growth rate but then attenuate with varying rates. For the entire population, R_e estimates made assuming 2-day serial interval were 1·74 (1·27), 1·74 (1·43), 1·66 (1·25), and 1·86 (1·37), respectively, during the first week (first 3 weeks) of each wave. Using age-specific mortality, the average R_e estimates over the first week of each wave were 1·62 (95% CI: 1·55–1·68), 1·68 (1·65–1·72), 1·67 (1·61–1·73), and 1·69 (1·63–1·74), respectively; R_e was not significantly different either among age cohorts or between waves.

Conclusions

The pandemic generally caused higher mortality among young adults and might have spread mainly among school-aged children during the first wave. We propose mechanisms to explain the timing and transmission dynamics of the four NYC pandemic waves.     

A novel method for lymphadenectomy along the left laryngeal recurrent nerve during thoracoscopic esophagectomy for esophageal carcinoma

Background

Due to limited space in the left upper mediastinum, complete dissection of lymph nodes (LN) along left recurrent laryngeal nerve (RLN) is difficult. We herein present a novel method for lymphadenectomy along the left RLN during thoracoscopic esophagectomy in the semi-prone position for esophageal carcinoma. The method, suspension the esophagus and push aside trachea, allows en bloc lymphadenectomy along the left RLN from the below aortic arch to the thoracic inlet.

Methods

Between September 2014 and September 2015, a total of 110 consecutive patients with esophageal carcinoma were treated with thoraco-laparoscopic esophagectomy with cervical anastomosis in the semi-prone position. Outcomes between those who received surgery with the novel method and conventional surgery were compared.

Results

Fifty patients underwent the novel method and sixty received conventional surgery. The operative field around the left RLN was easier to explore with the novel method. The estimated blood loss was less (23.7±8.2 vs. 34.2±10.3 g, P=0.001), and the number of harvested LNs along the left RLN was greater (6.4±3.2 vs. 4.1±2.8 min, P=0.028) in the novel method group, while the duration of lymphadenectomy along left RLN was longer in the novel method group (28.2±3.9 vs. 20.3±2.8 min, P=0.005). The rate of hoarseness in the novel and conventional groups was 10% and 16.7%, respectively. No significant difference in postoperative morbidity related to the left RLN was noted between the groups.

Conclusions

The novel method during semi-prone esophagectomy for esophageal carcinoma is associated with better surgeon ergonomics and operative exposure.     

Empathy Training for Resident Physicians: A Randomized Controlled Trial of a Neuroscience-Informed Curriculum

Background

Physician empathy is an essential attribute of the patient–physician relationship and is associated with better outcomes, greater patient safety and fewer malpractice claims.

Objective

We tested whether an innovative empathy training protocol grounded in neuroscience could improve physician empathy as rated by patients.

Design

Randomized controlled trial.

Intervention

We randomly assigned residents and fellows from surgery, medicine, anesthesiology, psychiatry, ophthalmology, and orthopedics (N = 99, 52% female, mean age 30.6 ± 3.6) to receive standard post-graduate medical education or education augmented with three 60-minute empathy training modules.

Main Measure

Patient ratings of physician empathy were assessed within one-month pre-training and between 1–2 months post-training with the use of the Consultation and Relational Empathy (CARE) measure. Each physician was rated by multiple patients (pre-mean = 4.6 ± 3.1; post-mean 4.9 ± 2.5), who were blinded to physician randomization. The primary outcome was change score on the patient-rated CARE.

Key Results

The empathy training group showed greater changes in patient-rated CARE scores than the control (difference 2.2; P = 0.04). Trained physicians also showed greater changes in knowledge of the neurobiology of empathy (difference 1.8; P < 0.001) and in ability to decode facial expressions of emotion (difference 1.9; P < 0.001).

Conclusions

A brief intervention grounded in the neurobiology of empathy significantly improved physician empathy as rated by patients, suggesting that the quality of care in medicine could be improved by integrating the neuroscience of empathy into medical education.KEY WORDS: empathy, randomized controlled trial, communication skills, graduate medical education, patient–physician relationship     

Prophylactic use of noninvasive positive pressure ventilation in post-thoracic surgery patients: A prospective randomized control study

Objective

Prospective randomized controlled study was conducted to explore the effects and safety of prophylactic use of noninvasive positive pressure ventilation (NPPV) in post-thoracic surgery (PTS) patients, especially on the lung re-expansion, lung function change and postoperative pulmonary complications (PPCs).

Methods

Fifty PTS patients met the inclusion criterion were enrolled in the study. All subjects were randomly divided into conventional treatment (control) group and NPPV group. NPPV group received intermittent NPPV therapy in first three days of PTS. BiPAP ventilator was used with S/T mode in the study. The average IPAP was (13±3.2)cmH₂O (ranged from 7 to 18 cmH₂O) and EPAP was 4cmH₂O. Total ventilation time was (13.5±4.9) hours (ranged from 6.5 to 23 hours). PPCs rate, lung re-expansion, the volume of residual cavity, lung function and tolerance to NPPV were assessed with chest roentgenography, CT scan, lung function testing and clinical evaluation before and one week after surgery.

Results

1. There was no significant difference of total PPCs rate during hospitalization between the two groups (5/23 in NPPV group vs 6/27 in control group, P= 0.967). Multiple factorial logistic regression analysis showed that COPD was a risk factor for PPCs (B=1.705, P=0.027). 2. Compared with control group, NPPV therapy reduced inadequate lung expansion rate (3/23 vs 13/27, P=0.008) and volume of residual cavity calculated with CT scan [(31.9±71.7)ml vs (63.6±78.3)ml, P=0.02]. However, there were no significant difference in the change of lung function parameters after operation between the two groups (all P>0.05). No significant adverse effects of NPPV were found in the present study.

Conclusions

In the current study of prophylactic application of NPPV in post-thoracic surgery patients, the use of NPPV resulted in improved lung re-expansion, but had no significant effects on post-operative pulmonary complications and lung functions.     

A cross-sectional study of the association between overnight call and irritable bowel syndrome in medical students

BACKGROUND:

Shift work has been associated with irritable bowel syndrome (IBS), which includes gastrointestinal symptoms such as abdominal pain, constipation and diarrhea. Overnight call shifts also lead to a disruption of the endogenous circadian rhythm.

HYPOTHESIS:

Medical students who perform intermittent overnight call shifts will demonstrate a higher prevalence of IBS symptoms when compared with medical students who perform no overnight call shifts.

METHODS:

First- and second-year (preclinical) medical students have no overnight call requirements, whereas third- and fourth-year medical (clerkship) students do have overnight call requirements. All medical students at the Schulich School of Medicine and Dentistry (London, Ontario) were invited to complete an anonymous, web-based survey or an identical paper copy that included demographic data, the Rome III questionnaire and the IBS-Quality of Life measure (IBS-QOL). The prevalence of IBS symptoms and quality of life secondary to those symptoms were determined.

RESULTS:

Data were available for 247 medical students (110 pre-clinical students, 118 clerkship students and 19 excluded surveys). There was no significant difference in the presence of IBS between preclinical and clerkship students (21 of 110 [19.1%] versus 26 of 118 [22.0%]; P=0.58). The were no significant differences in mean (± SD) IBS-QOL score of those with IBS between preclinical (43.5±8.3) and clerkship students (45.7±13.8) (P=0.53).

CONCLUSIONS:

Participation in overnight call was not associated with the development of IBS or a lower quality of life secondary to IBS in medical students.