Towards Quantifying Stress in Patients with a History of Myocardial Infarction: Validating ECG-Derived Patch Features.

Patients with prior myocardial infarction (MI) have an increased risk of experiencing a secondary event which is exacerbated by mental stress. Our team has developed a miniaturized patch with the capability to capture electrocardiogram (ECG), seismocardiogram (SCG) and photoplethysmogram (PPG) signals which may provide multimodal information to characterize stress responses within the post-MI population in ambulatory settings. As ECG-derived features have been shown to be informative in assessing the risk of MI, a critical first step is to ensure that the patch ECG features agree with gold-standard devices, such as the Biopac. However, this is yet to be done in this population. We, thus, performed a comparative analysis between ECG-derived features (heart rate (HR) and heart rate variability (HRV)) of the patch and Biopac in the context of stress. Our dataset contained post-MI and healthy control subjects who participated in a public speaking challenge. Regression analyses for patch and Biopac HR and HRV features (RMSSD, pNN50, SD1/SD2, and LF/HF) were all significant (p<0.001) and had strong positive correlations (r>0.9). Additionally, Bland-Altman analyses for most features showed tight limits of agreement: 0.999 bpm (HR), 11.341 ms (RMSSD), 0.07% (pNN50), 0.146 ratio difference (SD1/SD2), 0.750 ratio difference (LF/HF).Clinical relevance- This work demonstrates that ECG-derived features obtained from the patch and Biopac are in agreement, suggesting the clinical utility of the patch in deriving quantitative metrics of physiology during stress in post-MI patients. This has the potential to improve post-MI patients' outcomes, but needs to be further evaluated.

Association of systemic inflammation with posttraumatic stress disorder after a myocardial infarction.

Background: Adverse mental health conditions including depression, posttraumatic stress disorder (PTSD), and anxiety are prevalent among patients who survive myocardial infarctions (MI) and are associated with adverse outcomes. The mechanisms underlying these associations, however, are not well understood. Inflammatory pathways may mediate the cardiovascular outcomes of patients with mental health disorders. We examined the bidirectional association between PTSD symptoms and inflammatory biomarkers in a young/middle-aged post MI population. We further examined how this association may differ between women and men as well as between Black and non-Black individuals. Methods: Participants included individuals with early onset MI between the ages 25 and 60. Mental health scores for depression, PTSD, perceived stress, and anxiety as well as inflammatory biomarkers, interleukin-6 (IL-6) and high sensitivity C-reactive protein (hsCRP), were collected at baseline and at six-month follow up. We examined the bidirectional changes in mental health symptoms and inflammatory biomarkers between baseline and follow-up. Results: Among 244 patients in the study (mean age: 50.8, 48.4% female, 64.3% Black), the geometric means for IL-6 level and hsCRP at rest were 1.7 pg/mL and 2.76 mg/L, respectively. Mental health scores at baseline did not consistently predict changes in inflammatory biomarkers at follow-up. However, baseline levels of both IL-6 and hsCRP were robustly associated with an increase in re-experiencing PTSD symptoms at 6 months: in adjusted linear mixed models, there was a 1.58-point increase in re-experiencing PTSD symptoms per unit of baseline hsCRP (p = 0.01) and 2.59-point increase per unit of baseline IL-6 (p = 0.02). Once the analysis was stratified by race, the association was only noted in Black individuals. Baseline inflammation was not associated with change in any of the other mental health symptom scores. Conclusion: Markers of inflammation are associated with an increase in post-event PTSD symptoms in younger or middle-aged patients who experienced an MI, especially Black patients. These results suggest a mechanistic link between inflammation and the development of PTSD among individuals with cardiovascular disease.

Obstructive sleep apnea, myocardial perfusion and myocardial blood flow: A study of older male twins.

BACKGROUND: Obstructive sleep apnea (OSA) has been associated with incidence of cardiovascular disease and with nocturnal angina, but evidence of a link with coronary atherosclerosis and myocardial ischemia is limited and previous studies may have been affected by selection bias or unmeasured confounding factors. METHODS: We performed overnight polysomnography in 178 older male twins. The Apnea/Hypopnea Index (AHI) was calculated to assess OSA from the overnight sleep evaluation. AHI ≥15 was used as indicator of moderate/severe OSA. The following day, twins underwent myocardial perfusion imaging with [82Rb]-chloride positron emission tomography. Quantitative and semiquantitative measures of myocardial perfusion and absolute myocardial blood flow were obtained. RESULTS: The mean age was 68 years and 40% of the sample had an AHI≥15, which indicates moderate to severe OSA. Abnormal myocardial perfusion, both with stress and at rest, was more common in twins with elevated AHI. After adjusting for clinical, lifestyle and behavioral factors, and previous history of cardiovascular disease, twins with AHI ≥15 had 3.6 higher odds (95% CI, 1.5-8.9) of an abnormal total severity score, defined as a score ≥100, and for each 5-point increment in AHI, the odds of abnormality increased by 20% (95% CI, 7%-34%). Twin pairs where both twins had OSA exhibited the greatest risk. There were no differences in measures of ischemia and absolute myocardial blood flow and flow reserve by AHI status. CONCLUSIONS: OSA is associated with myocardial perfusion abnormalities that suggest prior subclinical myocardial scarring or infarction. Early environmental factors that affect both twins equally may play a role and should be further explored.

Digging deep into diabetes: achieving better glycemic control in diabetic patients in a resident-run clinic.

Background: Diabetes mellitus (DM) affects over 30 million Americans with an estimated annual cost of $327 billion in 2017. Patients with diabetes, especially with financial and/or social hardships, pose challenges in achieving target hemoglobin A1c (HbA1c) values. Understanding patient-specific barriers offer opportunities to improve outcomes in patient care. Objective: We aimed to improve a patient's glycemic control by reducing barriers to care. Furthermore, we evaluated the impact that a resident quality improvement effort had on providing high value diabetic care. Methods: We performed a retrospective cohort study of patients with HbA1c >9.0% in an underserved, resident-run clinic. Patients were surveyed on their knowledge of diabetes and reported obstacles to achieve diabetic control. We then implemented a 12 -month customized, patient-directed, multi-modal, multidisciplinary intervention. Results: Ninety-four patients with HbA1c >9.0% were identified, 65 surveyed, and 51 included in the intervention phase. After the intervention phase, re-evaluation of HbA1c in a paired sample comparison showed that the average HbA1c had decreased by 1.41% (11.28% vs. 9.87%, p < 0.01). Among the patients included in the intervention group, approximately 8% had their HbA1c reduced by ≥50% from their baseline, 23% had their HbA1c reduced by ≥25% from their baseline and 49% had their HbA1c reduced by ≥10% from their baseline. Conclusions: A strategically designed, a patient-centered customized intervention can have a positive impact on a patient's diabetic control.

Ciclosporin-induced accessory breast tissue: Dramatic improvement after dose adjustment.

Accessory breast tissue is a relatively common congenital condition in which abnormal accessory breast tissue is seen as a mass anywhere along the course of embryologic mammary streak in addition to the presence of normal breast tissue. Ciclosporin therapy has been associated with benign breast disease in women. However, to the best of our knowledge, there are no reported cases of accessory breast tissue growth associated with ciclosporin therapy and regression after adjusting the dose. A 48-year-old woman had renal transplantation in 2009 with her brother as the donor. Her transplant follow-up over eight years had been unremarkable. She presented to our transplant follow-up clinic with bilateral painful axillary masses approximately 3 cm × 3 cm in diameter, not attached to the skin or underlying structures with no skin changes and no lymphadenopathy. Breast examination did not reveal any abnormalities. Her ciclosporin levels over the previous three years ranged between 130 and 150 ng/mL. These levels were within the acceptable recommended level of 100-150 ng/mL at that time (currently reduced to 80-120 ng/ml). Ultrasound of both axilla showed well-defined hypoechoic smooth outline masses in both axillary regions 3 cm × 4 cm. Fine-needle aspiration showed lesions consisting of cohesive ductal cells. The findings were consistent with accessory breast tissue with no evidence of inflammatory infiltrate or malignant changes. Her ciclosporin dose was reduced with the subsequent follow-up visits levels ranging between 90 and 110 ng/mL. Clinical examination four months later showed dramatic reduction in the axillary masses on both sides. Ultrasound confirmed the regression in the size of both masses. We conclude that ciclosporin was probably responsible for the formation of accessory breast tissue and reduction in the dose of ciclosporin resulted in substantial reduction in the tissue size.

Acute Kidney Injury in Sub-Sahara Africa: A Single-Center Experience from Khartoum, Sudan.

BACKGROUND: The burden of acute kidney injury (AKI) is high in Africa. While there are no reliable statistics about AKI in Africa, the Global Snapshot Study of the 0by25 initiative of the International Society of Nephrology has determined dehydration, infections, animal envenomation, and complications during pregnancy as the main causes. METHODS: This study was conducted at the Soba University Hospital (SUH), Khartoum, Sudan, a tertiary referral center. We included all hemodialysis patients treated for AKI at SUH between -January 1, 2013 and December 31, 2014 in the study. We reviewed patients' hospital records and characterized pathogenesis, treatment, and patient outcomes. In addition, we investigated survival by Kaplan-Meier and Cox regression analysis. RESULTS: Out of 520 patients who received emergency HD, 71 patients (14%) had AKI (age 40.6 ± 17.3 years, 56.5% were males). Glomerular and tubular-interstitial diseases were the leading cause of AKI, followed by envenomation and intoxication by hair dye. Patients received a median of 5 dialysis sessions for a median of 8 days. In 32 patients (45%) renal function recovered, 10 patients (14%) died, and 29 patients (41%) remained dialysis-dependent. Mortality was significantly higher in females compared to men (hazard ratio 4.1 [95% CI 1.02-16.67]). Outcomes were worse in patients with pre-renal AKI and intoxications. CONCLUSION: Our results indicate a higher mortality in females and in patients with pre-renal AKI and intoxications. Awareness of factors associating with poor outcomes is central to diagnostic and therapeutic efforts, and must be considered in the design of initiatives to reduce risk factors and improve outcomes of AKI in developing countries.

The effect of an educational program for vascular access care on nurses' knowledge at dialysis centers in Khartoum State, Sudan.

End-stage renal disease is a worldwide problem that requires highly skilled nursing care. Hemodialysis (HD) is a corner-stone procedure in the management of most patients who require renal replacement therapy. Adequate vascular access is essential for the successful use of HD. Appropriate knowledge in taking care of vascular access is essential for minimizing complications and accurately recognizing vascular access-related problems. This study was to evaluate the effect of an educational program for vascular access care on nurses' knowledge at nine dialysis centers in Khartoum State. This was a Quasi experimental study (pre-and post-test for the same group). Sixty-one nurses working in these HD centers were chosen by simple random sampling method. A structured face-to-face interview questionnaire based on the Kidney Dialysis Outcome Quality Initiative (K/DOQI) clinical practice guidelines for vascular access care was used. Instrument validity was determined through content validity by a panel of experts. Reliability of the instrument was tested by a pilot study to test the knowledge scores for 15 nurses. The Pearson correlation coefficient obtained was (r = 0.82). Data collection was taken before and after the educational intervention. A follow-up test was performed three month later, using the same data collection tools. Twenty-two individual variables assessing the knowledge levels in aspects related to the six K/DOQI guidelines showed improvement in all scores of the nurses' knowledge after the educational intervention; and the differences from the preeducational scores were statistically significant (P < 0.001). The study showed that a structured educational program based on the K/DOQI clinical practice guidelines had a significant impact on the dialysis nurses knowledge in caring for vascular access in HD patients. The knowledge level attained was maintained for at least three months after the educational intervention.

An educational intervention to increase awareness reduces unnecessary laboratory testing in an internal medicine resident-run clinic.

At our resident-run clinic in an underserved community, laboratory test costs in 2013 exceeded the government subsidy by $400 000. To optimize limited resources and improve patient care, an education program to reduce testing was implemented. Between November 2014 and January 2015, residents attended lectures on utilization of laboratory testing, focusing on standard practice guidelines, and analyses of unnecessary tests. Multivariate nonparametric statistical methods and subgroup analysis were used to evaluate cost reduction. There were 453 clinic visits during the intervention period and 471 visits during the control period. Lectures were independently associated with a significant laboratory cost reduction. Median laboratory cost per visit decreased from $106.00 to $74.00. Total cost in the study period decreased from $79 403 to $51 463. There were similar reductions of laboratory costs in two subgroups: age groups of <50 years and ≥50 years, new encounters, and follow-up visits . In the analysis of individual tests, the cost of TSH and Vitamin D tests had the greatest reduction ($8176 and $5088 respectively). An appropriate physician education program can reduce laboratory tests and costs. Screening tests with inadequate evidence support were reduced most, whereas those with proven benefits did not decrease significantly.

Incidence, prevalence, and treatment of end-stage renal disease in the Middle East.

INTRODUCTION: This article reviews the status of end-stage renal disease in the Middle East, with emphasis on its incidence, prevalence, and treatment. METHODS: Data were obtained from English-language published literature through a Medline search over the past 40 years. Supplementary information was gathered from regional congresses and symposia, websites of specialized nephrology centers, and direct communications. RESULTS: Of the 14 Middle East countries, attention was focused on 10 countries with similar renal care systems: 7 Arabian Peninsula countries and 3 eastern Mediterranean countries. Collectively, they have a population of 72.5 million. Incidence of ESRD ranged between 64 and 212 patients per million population (pmp) with an average of 93 patients pmp. The lowest prevalence was 320, the highest was 462, and the average was 352 patients pmp. Hemodialysis is the preferred dialysis modality and is freely available in all countries for citizens. Non-citizen residents' access to hemodialysis is markedly restricted. Peritoneal dialysis is available on a limited scale. Renal transplantation is available in all countries with variable program activities. Most of the transplants are from living, related donors. Active deceased donor transplant programs exist in four countries. The results from countries with active programs are excellent, with 5-year patient and graft survival of > 90%. CONCLUSIONS: This review provides information on the incidence, prevalence and treatment modalities of ESRD in 10 Middle East countries.