Clinical practice guideline: evidence, recommendations and algorithm for the preoperative optimization of anemia, hyperglycemia and smoking

Preoperative optimization has not been explored comprehensively in the surgical literature, as this responsibility has often been divided among surgery, anesthesia and medicine. We developed an evidence-based clinical practice guideline to summarize existing evidence and present diagnostic and treatment algorithms for use by surgeons caring for patients scheduled to undergo major elective surgery. We focus on 3 common comorbid conditions seen across surgical specialties - anemia, hyperglycemia and smoking - as these conditions increase complication rates in patients undergoing major surgery and can be optimized successfully as soon as 6-8 weeks before surgery. With the ability to address these conditions earlier in the patient journey, surgeons can positively affect patient outcomes. The aim of this guideline is to bring optimization in the preoperative period under the existing umbrella of evidence-based surgical care.

Assessing the validity of an OSCE developed to assess rare, emergent or complex clinical conditions in endocrinology & metabolism

BACKGROUND

Assessment of emergent, rare or complex medical conditions in Endocrinology and Metabolism (E&M) is an integral component of training. However, data is lacking on how this could be best achieved. The purpose of this study was to develop and administer an Objective Structured Clinical Examination (OSCE) for E&M residents, and to gather validity evidence for its use.

METHODS

A needs assessment survey was distributed to all Canadian E&M Program Directors and recent graduates to determine which topics to include in the OSCE. The top 5 topics were selected using a modified Delphi technique. OSCE cases based on these topics were subsequently developed. Five E&M residents (PGY4-5) and five junior Internal Medicine (IM) residents participated in the OSCE. Performance of E&M and IM residents was compared and results were analyzed using a Generalizability study. Examiners and candidates completed a survey following the OSCE to evaluate their experiences.

RESULTS

The mean score of IM and E&M residents was 41.7 and 69.3 % (p < 0.001), respectively, with a large effect size (partial η² = 0.75). Overall reliability of the OSCE was 0.74. Standard setting using a borderline regression method resulted in a pass rate of 100 % of E&M residents and 0 % of IM residents. All residents felt the OSCE had high value for learning as a formative exam.

CONCLUSIONS

The E&M OSCE is a feasible method for assessing emergent, rare and complex medical conditions and this study provides validity evidence to support its use in a competency-based curriculum.

Cardiovascular Outcomes in Autonomous Cortisol Secretion and Nonfunctioning Adrenal Adenoma: A Systematic Review

There is growing evidence that autonomous cortisol secretion (ACS), previously known as subclinical Cushing syndrome, is associated with greater prevalence of cardiovascular (CV) risk factors. However, it is unclear whether ACS is associated with greater prevalence of CV outcomes compared with nonfunctioning adrenal adenomas (NFAAs). The objective of this study is to evaluate CV outcomes and CV risk factors in patients with adrenal adenoma with ACS compared with NFAA. A literature review was performed in Embase, Medline, Cochrane Library, and reference lists within selected articles. The study protocol was registered with PROSPERO. A literature search yielded six studies that met the inclusion criteria. Studies varied in their definitions of ACS and CV outcomes. Two retrospective longitudinal studies further demonstrated higher incidence of new CV events (ACS 16.7% vs NFAA 6.7%, P = 0.04) and higher CV mortality in patients with ACS (ACS 22.6% vs 2.5%, P = 0.02). The prevalence of CV outcomes in ACS was more than three times greater than in patients with NFAA. Three of five studies found that ACS was associated with higher prevalence of diabetes and hypertension. There was no difference in dyslipidemia or body mass index demonstrated in any study. There is heterogeneity among the few studies evaluating the association between ACS and CV outcomes. Although these studies suggest a higher risk of CV outcomes in patients with ACS, many did not adjust for known confounders. Larger, high quality, prospective studies are needed to evaluate this association and to identify modifiable risk factors.

Improving Glycemic Control in Adults and Children With Type 1 Diabetes With the Use of Smartphone-Based Mobile Applications: A Systematic Review

OBJECTIVES

Management of type 1 diabetes is often challenging. Smartphone mobile applications (apps) may provide additional support and help to improve glycemic control and clinical outcomes. The objectives of this study were to examine the literature evaluating the use of mobile apps (stand-alone and text messaging/feedback) in type 1 diabetes and to review top-rated mobile apps applicable to type 1 diabetes.

METHODS

Medline, Cochrane and Embase databases were systematically searched to identify studies published from inception to February 2018. Top-rated relevant apps from Google Play Store and Apple App Store were reviewed in July 2017.

RESULTS

The literature search yielded 3,462 studies. Of these studies, 9 evaluated the stand-alone apps; 3 showed significant improvement in glycated hemoglobin (A1C) levels (0.5%, p<0.05, 0.57%, p<0.05, and 0.58%, p=0.02); 3 demonstrated improved adherence to glucose monitoring; and 1 study demonstrated a reduction in hypoglycemic events (glucose<3.0 mmol/L) in 6 of 10 participants who completed the study. Also, 5 studies evaluated a mobile app plus text-messaging/feedback system. Only 1 showed a significant reduction in severe hypoglycemic events (mobile app+text, IQR 0.33, 95% CI 0.17 to 0.63; vs. control, IQR 2.29, 95% CI 1.80 to 2.91), while another single study demonstrated a reduction in median glycated hemoglobin levels (0.3%; p<0.001). Most top-rated mobile apps logged parameters relevant to diabetes management, and some provided graphic analysis and set reminders.

CONCLUSIONS

This study highlights the need for larger and longer studies to explore the efficacy of apps to optimize outcomes in type 1 diabetes, the populations that would benefit most from these tools and the resources needed to support mobile apps plus text-messaging/feedback systems.

Paradoxically Decreased HDL-Cholesterol Levels Associated with Rosiglitazone Therapy

Objective:

To report 2 cases of very low high-density lipoprotein cholesterol (HDL-C) levels associated with rosiglitazone therapy.

Case Summary:

Two patients with type 2 diabetes taking rosiglitazone for glycemic control developed paradoxically low HDL-C levels during rosiglitazone therapy. In the first patient, the HDL-C level decreased from 33 to 11.6 mg/dL after 8 months of therapy. The second patient's HDL-C level decreased from the baseline level of 44.8 mg/dL to 19.7 mg/dL after 4 months of rosiglitazone use. These abnormalities resolved on discontinuation of rosiglitazone and were not observed when the patients were treated with pioglitazone. The patients had no changes to other drug therapy or medical conditions known to affect lipid metabolism during treatment with rosiglitazone.

Discussion:

Thiazolidinediones, insulin sensitizers widely used in the treatment of type 2 diabetes, have been reported to have beneficial effects on lipids, such as triglyceride lowering and HDL-C elevation, in addition to their glucose-lowering effects. It has been suggested that rosiglitazone and pioglitazone, the 2 currently available thiazolidinediones, may differ in their effects on lipids. As of July 2006, a total of 8 cases of paradoxical lowering of plasma HDL-C associated with rosiglitazone have now been reported. Based on use of the Naranjo probability scale, the 2 cases presented here were probably associated with rosiglitazone. The duration of therapy may be important in this paradoxical effect.

Conclusions:

Rosiglitazone is associated with a paradoxical decrease in HDL-C levels in patients with type 2 diabetes. In patients receiving rosiglitazone, a baseline lipid panel should be performed and lipid values should be monitored during the course of therapy.

Clinical predictors for diabetes screening in the first year postpartum after gestational diabetes

BACKGROUND

Postpartum screening for diabetes in women with gestational diabetes (GDM) improves with use of reminder systems. Our primary objective was to identify predictors of diabetes screening in the first year after delivery.

METHODS

A retrospective study was performed of 556 women with GDM who received outpatient prenatal care between 2007 and 2009. A mailed reminder system was utilized at two sites. Rates of postpartum glucose testing at 6 and 12 months postpartum were measured.

RESULTS

Site of care and non-smoking status were identified as the only predictors of postpartum diabetes screening (p<0.001 and p = 0.02, respectively). Rates of OGTT completion at one year (38% vs. 19% p<0.001) were higher in women who attended clinics with postpartum reminders.

CONCLUSIONS

The site of diabetes care in pregnancy is a major predictor of adherence to diabetes screening postpartum. Health care delivery should be considered in the development of strategies to increase screening rates.

An unusual case of malignancy-related hypercalcemia

Objective

To report the case of a 28-year-old woman who presented with hypercalcemia (total calcium =4.11 mmol/L), elevated parathyroid hormone (PTH) 24.6 pmol/L, normal parathyroid hormone-related peptide 7.8 pg/mL, and a 63 mm × 57 mm, poorly differentiated neuroendocrine carcinoma (small-cell type) pancreatic mass with liver metastases.

Investigations and treatment

Hypercalcemia was acutely managed with intravenous fluids, pamidronate and calcitonin. Investigations for multiple endocrine neoplasia type 1 and parathyroid adenoma were initiated. The identified neuroendocrine tumor was treated with cisplatinum/etoposide chemotherapy.

Results

The pancreatic mass (56 mm × 49 mm) and metastases decreased in size with chemotherapy and calcium levels normalized. Eight months later, calcium increased to 3.23 mmol/L, PTH increased to 48.2 pmol/L, and the pancreatic mass increased in size to 67 mm × 58 mm. The patient was given a trial of cinacalcet but was unable to tolerate it. Chemotherapy was restarted and resulted in a decrease in the pancreatic mass (49 mm × 42 mm), a reduction in PTH levels (16.6 pmol/L), and calcium levels (2.34 mmol/L).

Conclusion

Ectopic PTH secreting tumors should be considered when there is no parathyroid related cause for an elevated PTH. Recognizing the association between PTH and hypercalcemia of malignancy may lead to an earlier detection of an undiagnosed malignancy.

Into the abyss: diabetes process of care indicators and outcomes of defaulters from a Canadian tertiary care multidisciplinary diabetes clinic

Background

Continuity of care is essential for good quality diabetes management. We recently found that 46% of patients defaulted from care (had no contact with the clinic for 18 months after a follow-up appointment was ordered) in a Canadian multidisciplinary tertiary care diabetes clinic. The primary aim was to compare characteristics, diabetes processes of care, and outcomes from referral to within 1 year after leaving clinic or to the end of the follow-up period among those patients who defaulted, were discharged or were retained in the clinic.

Methods

Retrospective cohort study of 193 patients referred to the Foustanellas Endocrine and Diabetes Center (FEDC) for type 2 diabetes from January 1, 2005 to June 30, 2005. The FEDC is the primary academic referral centre for the Ottawa Region and provides multidisciplinary diabetes management. Defaulters (mean age 58.5 ± 12.5 year, 60% M) were compared to patients who were retained in the clinic (mean age 61.4 ± 10.47 years, 49% M) and those who were formally discharged (mean age 61.5 ± 13.2 years, 53.3% M). The chart audit population was then individually linked on an individual patient basis for laboratory testing, physician visits billed through OHIP, hospitalizations and emergency room visits using Ontario health card numbers to health administrative data from the Ministry of Health and Long-Term Care at the Institute for Clinical and Evaluative Sciences (ICES).

Results

Retained and defaulted patients had significantly longer duration of diabetes, more microvascular complications, were more likely to be on insulin and less likely to have a HbA1c < 7.0% than patients discharged from clinic. A significantly lower proportion of patients who defaulted from tertiary care received recommended monitoring for their diabetes (HbA1c measurements, lipid measurements, and periodic eye examinations), despite no difference in median number of visits to a primary care provider (PCP). Emergency room visits were numerically higher in the defaulters group.

Conclusions

Patients defaulting from a tertiary care diabetes hospital do not receive the recommended monitoring for their diabetes management despite attending PCP appointments. Efforts should be made to minimize defaulting in this group of individuals.

Prevalence of metabolic markers of insulin resistance in offspring of gestational diabetes pregnancies

In utero hyperglycemia has been associated with insulin resistance (IR) in children; however, there are limited data in low-risk populations. The purpose of this study was to describe the prevalence of metabolic markers of IR in a primarily Caucasian cohort of gestational diabetes mellitus (GDM) offspring aged 7-11 yr (mean 9.1) and to correlate offspring with maternal indexes. Sixty-eight children were recruited through a follow-up study of women who participated in a randomized controlled trial of minimal intervention vs. tight glycemic control for GDM. All participants had a fasting plasma glucose (FPG), insulin, total cholesterol, high-density lipoprotein cholesterol (HDL-chol), triglyceride (TG) level, and a 2-h oral glucose tolerance test. We calculated homeostasis model assessment (HOMA) and recorded body mass index and waist circumference (WC). Criteria for metabolic syndrome for children included: FPG > 6.0 mmol/L, HDL-chol < 1.03 mmol/L, TG > 1.24 mmol/L, WC > 90% for age and gender, and 2-h glucose > 7.8 mmol/L. Among these children, 45 (66%), 17 (25%), 5 (7%), and 1 (1.5%) had zero, one, two, or three metabolic markers of IR, respectively. Hypertriglyceridemia (21%) was most prevalent, with no child having an elevated FPG. WC (p = 0.018) and TG (p = 0.005) were strong predictors of IR in the offspring after adjustment for age, gender, birthweight, family history, and maternal IR. Maternal and offspring HDL-chol, TG, WC, and HOMA but not fasting or 2-h glucose levels were significantly correlated. We conclude that metabolic markers of IR in children exposed to GDM may be present in the absence of abnormal fasting or 2-h glucose values. Screening strategies that focus on glucose levels may need to be reconsidered to institute early intervention with lifestyle changes for children at risk.

Glucose tolerance of offspring of mother with gestational diabetes mellitus in a low-risk population

AIMS

To describe the prevalence of impaired glucose tolerance and obesity in offspring of mothers whose pregnancies were complicated by gestational diabetes mellitus (GDM) in a low-risk population and to investigate the effect on these outcomes of minimal intervention compared with tight control for management of GDM.

METHODS

Eighty-nine children (mean age 9.1 years, 93% Caucasian) were recruited through a follow-up study of women previously involved in a randomized controlled trial of minimal intervention (control group) vs. tight glycaemic control (treatment group) for GDM. Fasting blood glucose (FBG) and 2-h glucose tolerance tests (2hGTT) were performed on offspring and body mass index (BMI) calculated. Glucose tolerance and BMI of treatment groups were compared using non-inferiority tests (non-inferiority margin -15%).

RESULTS

Of those offspring, 6.9% (5/72) had abnormal glucose metabolism [four children had impaired glucose tolerance (IGT) and one had Type 2 diabetes mellitus (DM) (all Caucasian)]. Of the four children with IGT, three were male, three had normal BMI, and three had a family history of Type 2 diabetes. Of the 71 offspring who underwent 2hGTT, 25/25 (100%) of the control offspring and 46/46 (100%) of the treatment offspring had normal FBG (FBG < 5.7 mmol/l). Twenty-five of 25 (100%) of control and 42/46 (91.3%) of the treatment offspring had normal glucose tolerance (2hGTT < 7.8 mmol/l) (% difference 8.7, 95% CI -5.6, 20.3). BMI < 85th percentile was found in 25/33 (75.8%) of the treatment group and 44/52 (84.6%) of the control group (difference in percentage -8.9, 95% CI -27.2, 7.8).

CONCLUSIONS

School-age children of mothers with GDM are at risk of IGT and overweight, even if from a low-risk ethnic population. FBG was not adequate for screening this population. Minimal intervention for glycaemic control in GDM pregnancies appears to be as effective as tight control for preventing IGT in childhood but not for preventing obesity.

Use of low molecular weight heparin in acute venous thromboembolic events in pregnancy

OBJECTIVE

To compare the maternal and neonatal outcomes arising from the use of low molecular weight heparin (LMWH) or unfractionated heparin (UFH) in the treatment of acute venous thromboembolism (VTE) in pregnancy.

STUDY DESIGN

A retrospective review of the charts of all women treated for acute VTE in pregnancy at the Ottawa Hospital from January 1990 to December 1999.

RESULTS

Twenty-three cases were identified, of which 11 were treated with LMWH and 12 with UFH. Maternal and fetal outcomes were similar between the two groups. Hospital length of stay was shorter in the LMWH group. There was no difference in delivery management between the two groups. There was minor bleeding in 2 women in the UFH group and none in the LMWH group. There was one recurrent VTE during treatment in each of the groups.

CONCLUSION

There is no difference in complication rate between LMWH and UFH in the treatment of acute VTE in pregnancy.