United States

Background: Asymptomatic aortic stenosis management is not only a daily practice challenge but also an area of clinical research controversy. As evidence on conservative versus early aortic valve replacement (AVR) is debatable, we conducted a systematic review and meta-analysis to compare the efficacy of conservative versus AVR in asymptomatic aortic stenosis (AS).

Methods: Electronic databases were systematically searched to identify any observational or interventional studies that compared the effects of conservative management versus AVR on all causes, cardiovascular, non-cardiovascular mortality. Pooled risk ratios (RR) and their 95% confidence intervals (CI) were calculated using random-effects models.

Results: A total of 6216 patients were included from 12 studies (observational=10, and randomized clinical trial=2) with a mean follow-up duration of 5 years. When compared to early AVR, conservative management has statistically significant higher risk of all cause (RR: 0.36, 95%CI [0.32 to 0.46], p&lt;0.00001), cardiovascular (RR: 0.32, 95%CI [0.24 to 0.41], p&lt;0.00001), and non-cardiovascular mortality with (RR: 0.30, 95%CI [0.12 to 0.73], p=0.008). Regarding other complications, conservative treatment showed significant higher risk in sudden cardiac death (RR: 0.46, 95%CI [0.30-0.71], p=0.0005), yet no difference over AVR in stroke, myocardial infarction (RR: 0.86, 95% CI [0.35 to 2.13], p=0.75) and (RR: 0.54, 95% CI [0.19 to 1.53], p=0.25), respectively. 

Conclusion: Patients with asymptomatic aortic valve stenosis, managed with early AVR, have a lower risk of all-cause, cardiovascular, and non-cardiovascular mortality when compared to conservative management.

AMA Research Challenge 2022

Conservative management versus early aortic valve replacement for treatment of asymptomatic aortic stenosis: a systematic review &amp; meta-analysis

Background: Asymptomatic aortic stenosis management is not only a daily practice challenge but also an area of clinical research controversy. As evidence on conservative versus early aortic valve replacement (AVR) is debatable, we conducted a systematic review and meta-analysis to compare the efficacy of conservative versus AVR in asymptomatic aortic stenosis (AS).

Methods: Electronic databases were systematically searched to identify any observational or interventional studies that compared the effects of conservative management versus AVR on all causes, cardiovascular, non-cardiovascular mortality. Pooled risk ratios (RR) and their 95% confidence intervals (CI) were calculated using random-effects models.

Results: A total of 6216 patients were included from 12 studies (observational=10, and randomized clinical trial=2) with a mean follow-up duration of 5 years. When compared to early AVR, conservative management has statistically significant higher risk of all cause (RR: 0.36, 95%CI [0.32 to 0.46], p<0.00001), cardiovascular (RR: 0.32, 95%CI [0.24 to 0.41], p<0.00001), and non-cardiovascular mortality with (RR: 0.30, 95%CI [0.12 to 0.73], p=0.008). Regarding other complications, conservative treatment showed significant higher risk in sudden cardiac death (RR: 0.46, 95%CI [0.30-0.71], p=0.0005), yet no difference over AVR in stroke, myocardial infarction (RR: 0.86, 95% CI [0.35 to 2.13], p=0.75) and (RR: 0.54, 95% CI [0.19 to 1.53], p=0.25), respectively. 

Conclusion: Patients with asymptomatic aortic valve stenosis, managed with early AVR, have a lower risk of all-cause, cardiovascular, and non-cardiovascular mortality when compared to conservative management.

Conservative management versus early aortic valve replacement for treatment of asymptomatic aortic stenosis: a systematic review & meta-analysis

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Background: Atrial fibrillation (AF) is a common postoperative complication after 
coronary artery bypass surgery (CABG). Studies have shown a higher incidence 
of postoperative AF in White patients than in Black patients. This retrospective 
cross-sectional study aims to characterize the incidence and risk factors for 
postoperative AF in Middle Eastern and Black patients compared to White 
patients. 

Methods: Adult patients were included if they had undergone CABG between 
January 2014 and December 2021. Baseline demographics and perioperative 
data were collected. Patients’ race designations were based on self-identification 
in the electronic health records. Univariate and multivariable analyses were 
conducted to identify predictors of postoperative AF. 

Results: A total of 1686 patients were included (median age 67 years, 27% were 
females). There was a total of 1169 White, 440 Black, and 77 Middle Eastern patients. 
The overall incidence of postoperative AF was 40%. We observed a lower incidence 
of postoperative AF in Middle Eastern (32%, OR 0.59, 95% CI 0.36-0.97, P = 0.034) 
and Black patients (28%, OR 0.47, 95% CI 0.37-0.60, P = <0.001) as compared to 
White patients (45%). Other variables associated with postoperative AF on the 
univariate analysis included female gender, pre-operative AF, age, chronic kidney 
disease, left atrial size, obstructive sleep apnea, pre-operative AV nodal blockade, 
concomitant valvular surgery, and moderative-severe valvular disease. On 
multivariable analysis, the Middle Eastern race was associated with a lower incidence 
of postoperative AF with a trend towards significance (OR 0.60 95% CI 0.34-1.07, P 
0.081), whereas the Black race continued to be significantly associated with a lower 
incidence of postoperative AF (OR 0.59 95% CI 0.44-0.79, P <0.001). Other variables 
that continued to be significantly associated with postoperative AF included age ≥65 
years (OR 1.44 P 0.007), female gender (OR 0.63 P 0.002), left atrial size index >32 
ml/kg (OR 1.64 P 0.005), moderate-severe aortic stenosis (OR 1.88 P 0.005), 
preoperative AF (OR 4.55 P 0.005), and AV nodal blockade (OR 0.632 P 0.019). 

Conclusion: We report a lower prevalence of postoperative AF in Middle Eastern 
and Black patients. Further studies are needed to investigate the underlying 
associations between racial and ethnic categories and AF post CABG.

Effect of Race on the incidence of atrial fibrillation post-coronaryartery bypass surgery in a Middle Eastern Community in the United States

Introduction: Heart failure is a growing public health problem with an estimated prevalence of 4-5 million American population. Despite significant advances in heart failure management, the mortality remains high. This study aspires to investigate the risk factors that are associated with mortality in hospitalized heart failure patients.
Methods: We utilized the 2019 National Inpatient Sample (NIS) dataset sponsored by the Agency for Healthcare Research and Quality (AHRQ) under the Healthcare Cost and Utilization Project (HCUP). Patients with Heart Failure (HF) were identified using Clinical Classifications Software Refined (CCSR) for International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM). Variable of interest include hypertension, diabetes, dyslipidemia, peripheral vascular disease, nicotine use and sleep apnea. Clinical outcomes include HF hospitalizations and effect of different variable on HF mortality. 
Results: A weighted total of 5,675,784 HF related hospitalizations were recorded in the year 2019. A total of 3907455(68.9%) had hypertension, 2080710(36%) had diabetes and 3081445 (54%) had dyslipidemia . 651035(11%) had a comorbidity of peripheral arterial disease, 1542990 (27.1%) were nicotine dependent, and 991150 (17.4%) had sleep apnea. The mortality rate per 10,000 HF hospitalizations were analyzed. There were 7047 deaths due to hypertension as compared to 2953 in non-hypertensive population, 2368 deaths due to diabetes as compared to 2122 deaths in patients without diabetes. The Mortality rate was 4502 in patients with dyslipidemia as compared to 4234 in patients without dyslipidemia. Peripheral arterial disease (PAD) lead to 2434 death as compared to 2183 death in patients without PAD. The mortality rate 4649 deaths due to nicotine use as compared to 4278 in patients who do not use nicotine and 4580 was due to sleep apnea as compared to 4336 death in patients with no sleep apnea. 
Conclusion: Heart failure lead to significant number of hospitalization in the United States in year 2019. Among all studied factors, hypertension was found to be associated with highest mortality risk. This study guides the importance of strict blood pressure control in significantly decreasing mortality associated with heart failure. 





Heart Failure World: Risk factors for heart failure mortality in hospitalized patients

Impact of the type of Heart failure and Social determinants of health on Health Related Quality of Life (HRQOL) among patients in the South Bronx

BACKGROUND: Coronary microvascular dysfunction (CMD) and left atrial (LA) strain abnormality are more common in patients with Heart Failure with Preserved Ejection Fraction (HFpEF), but the relationship between CMD and LA strain is not well characterized. HFpEF is a major health burden in the United States, representing the number one cause of hospitalization for Americans over 65
years old. (1) Understanding how coronary microvascular dysfunction impacts HFpEF is important because CMD may be an important prognostic sign of deteriorating heart function, particularly in the HFpEF subset of heart failure. Despite CMD’s prognostic potential, it is currently difficult to measure; only invasive techniques can measure CMD.

OBJECTIVE: We undertook a study to see if non-invasive measurements of LA strain could be correlated with invasive measurements of CMD. We additionally looked at differences between HFpEF and control patients to see if LASr and CMD correlations were generalizable across disease states.

METHODS: We performed a retrospective, observational study of 90 patients at the University of Chicago Medical Center who had an indication for coronary angiography with coronary physiology testing from 2010-2021. CMD was defined as having an invasively-determined coronary flow reserve (CFR) ≤ 2.0. Non-invasive echocardiographic auto-strain analysis was used to obtain LA reservoir strain (LASr), LA conduit strain, and LA contractile strain. Univariable and multivariable logistic
regression was performed for HFpEF patients with various degrees of CMD.

RESULTS: For both HFpEF and control patients, lower LASr was more commonly found in patients with abnormal CFR (HFpEF: 22.5% ± 12.1 vs. 30.7% ± 10.7, P = 0.018; control: 26.0% ± 16.4 vs. 31.0% ± 9.8 , P = 0.185). Both a univariable and multivariable logistic regression of HFpEF patients found LASr to be a significant predictor of abnormal CFR (OR: 0.94, P =0.041).

CONCLUSIONS: There were substantially more patients with CFR ≤ 2.0 in the HFpEF group (50%) compared to control (28%). In HFpEF patients, non-invasively measured LASr showed significant correlation with invasively measured CFR, thus emerging as a potential predictive variable for CFR ≤ 2.0 in patients with this form of heart failure.

Left Atrial Strain Echocardiography May Be Correlated with Coronary Microvascular Dysfunction

Background: Accumulating evidence suggests hospitalized patients with heart failure (HF) are especially susceptible to COVID-19-related complications and mortality approaches 30%. We hypothesized that Boosted Tree (BT) mortality risk variance explained (VE%) by cardiac injury and putative COVID-19 thrombo-inflammatory biomarkers would be different between survivors and non-survivors in HF patients undergoing index hospitalization for SARS-CoV-2.

Methods: Presentation demographics, anthropometrics, laboratory results (within 8h), and ICD-10 codes were collected. Discrete data summarized as proportions were compared with chi-squared test. Continuous data summarized with median [IQR] were compared using Kruskal-Wallis test. COVID-19 therapy across 6-pandemic surges, demographics, and comorbidities were statistically balanced. Univariate logistic regression tested association (p<.05) of COVID-19 clinical traits putatively linked with mortality risk and provided a receiver operating characteristic (ROC) curve while computing Youden’s cut point. BT algorithm optimized area under ROC curve (AUROC) representing prediction accuracy while providing VE% contributed by each cut point variable.

Results: Among 5,841 consecutive patients discharged from index COVID-19 hospitalization between March 18, 2020, and April 30, 2022, 1039 harbored extant HF. Those with at least 1 high sensitivity troponin (hs-cTnI) assay, 483, were studied. Hospital mortality (n=62, 13%) and survival (n=421, 87%) patient demographics were statically similar with 63% males and 37% females aged 75[64-83] years distributed across Whites (82%), Blacks (11%), and other races (7%). Subsequent results are similarly sequenced. Most prevalent comorbidities were hypertension (81% vs. 92%, p=.007), diabetes (48% vs. 42%, p=.41), obesity (50% vs. 34%, p<.02), renal failure (34% vs. 38%, p=.58), iron deficiency anemia (35% vs. 35%, p=1.0), and chronic coagulation disorder (39% vs 17%, p=.0002). Biomarker cut points were hs-cTnI ≥26 ng/L (71% vs. 53%, p=.006), CRP ≥6.0 mg/dL (63% vs. 22%, p<.0001), d-dimer ≥2.98 ug/mL (45% vs. 26%, p=.015), LDH ≥444 U/L (61% vs. 20%, p<.0001), and ferritin ≥668 ng/mL (68% vs. 26%, p<.0001). BT model demonstrated 38% R2, AUROC=0.86 with VE% contributed by hs-cTnI (41%), CRP (27%), d-dimer (14%), LDH (10%), and ferritin (8%). 

Conclusion: Our training model demonstrates a machine learning strategy to integrate hs-cTnI with putative biomarkers of COVID-19 severity to enhance understanding of host response contributing to mortality risk at presentation in hospitalized HF patients.

Mortality Risk Variance Explained by High Sensitivity Troponin I Exceeds Putative COVID-19 Severity Biomarkers in Heart Failure Patients Hospitalized with Acute SARS-CoV-2 Infection

Cardiac catheter ablation is a useful tool in the treatment of Atrial Fibrillation (AFib). A subset of patients with AFib may also present with low Ejection Fraction (EF). This study seeks to quantify and analyze the impact of ablation on the EF of AFib patients who presented with a pre-operative EF below 50%. Patient data was retrieved from a private practice group, Florida Cardiology. Patients who underwent an ablation from Jan 2019 through Nov 2021, had a pre-operative EF less than 50%, and had a post-operative EF on record were included in this study. Diagnoses of Heart Failure as well as status of AFib recurrence at follow-up were also noted. Following data collection and statistical analysis, cardiac catheter ablation was found to lead to a statistically significant improvement in the EF of AFib patients that presented with low pre-operative EF < 50%. The average change was +13.15% (Std Dev of 10.11%). Ablation also led to resolution of AFib symptoms in 88.24% of patients. Ablation remains an effective and successful treatment modality for the management of Atrial Fibrillation in patients with a decreased EF (< 50%).

Not Too Late To Ablate: Effect of Cardiac Catheter Ablation on Ejection Fraction in Patients with Atrial Fibrillation and Pre-Op Ejection Fraction under 50%

Hypertension is one of the most prevalent chronic diseases in the United States, affecting approximately 1 in every 2 adults. Barriers to control blood pressures in the outpatient setting from a patient’s perspective include lack of understanding of disease, fear of medication adverse effects or dependence, medication affordability, healthy food choices and time required to follow up with medical providers. In HTN, there has been limited work investigating the role of how blood pressure (BP) monitors affect patients taking an active role in disease monitoring, management and risk modification. In this project, we hypothesize that patients will actively use provided BP monitors and will feel more empowered for controlling their hypertension. This in turn will improve medication adherence and positively reinforce patients to make lifestyle modifications. This study was conducted in the Internal Medicine Clinic at Prisma Health, Greenville, SC. 34 patients with a diagnosis of uncontrolled hypertension were enrolled. Patients were provided brachial cuff BP monitors and followed for 4 months while receiving medical therapy. We systemically contacted patients via phone interviews to determine their adherence (using adherence estimator survey), patients’ perspective on the BP monitors and how to use them. These phone interviews were coded independently by two members of the research team and cross-checked for confirmation, reconciling differences by discussion. Codes were grouped according to overarching themes and subthemes. For mixed analysis, the qualitative and quantitative data was merged after it had been independently analyzed to provide a mixed methods data analysis. Our results suggest that when BP monitors are provided to patients, and patients are educated on proper use of them, they are effective tools to help patients take an active role in managing their disease. Of the 34 patients, 23 patients responded to phone interviews. Assessment of the patients’ blood pressure (BP) was done in the clinic at the beginning of the study and then again at the conclusion of the study. Using a paired t-test, Systolic and diastolic blood pressure showed significant difference between the two time points dropping from a mean of 147.2/864 ± 23.3/16.4 mmHg to 133.7/78.7 ± 15.9/11.2 mmHg (± STD, p<0.005). Of the 23 patients, seventeen (77%) patients had high adherence, three (13%) patients had medium and two (9%) had low adherence according to the adherence estimator used. The low adherence was due to lack of conviction of the importance of blood pressure medication to their health. When questioned further about their opinions on home BP monitors, 3 themes arose from talking to patients: helpful, not-helpful, and somewhat-helpful. The subthemes identified within “helpful” category were Reinforcement, Lifestyle modification, and medical care. These themes were reflected in how often participants used their BP monitors. 16 (70%) patients demonstrated regular usage of BP monitors, while 4 (17%) patients demonstrated no usage whatsoever, and 3 (13%) patients demonstrated intermittent usage which matches the thematic analysis that was apparent in their responses of helpful, not-helpful, and somewhat-helpful, respectively (p<0.005). This study explores a unique perspective of hypertension management in the outpatient setting by providing patients with a tangible way to monitor their blood pressures that in turn augmented adherence. By empowering patients to understand the effects of lifestyle modifications and medications on their blood pressures on a regular basis via providing a BP monitor, there was improvement in the BP control. Although a small sample size, this study substantiates the important role the BP monitors can play in empowering patients for their HTN management. By positively impacting patients’ engagement in disease monitoring and risk modification, BP monitor provision has the potential to improve HTN control.

Provision of Blood Pressure Monitors to Improve Hypertension Control and Enhance Patient Self-Management and Empowerment 

Introduction: Coronary artery calcium (CAC) scoring has become an essential tool to help stratify patients at risk for adverse cardiac events. CAC scores vary significantly depending on age, gender, and race. Here, we evaluated racial variations in calcium scores among patients who presented with chest pain to the emergency department at our institution. 

Methods: Demographic and CAC data were obtained in patients who presented to the ED with chest pain between 2014 and 2017. Data was analyzed based upon reported race (white ‘W’ and African-American ‘AA’). The study group included 174 AA patients (59% female) and 512 W patients (48% female). Other racial categories were excluded. These patients were age (+/- 2 years) and gender matched, and mean CAC scores with standard deviations were calculated. Student’s t-test was used to compare the age-gender matched groups. 

Results: The mean CAC score (and standard deviation) for AA males was 33.6 (76.7) Agatston units (AU), while for W males, mean CAC score was 213.6 (549.3) AU. For AA females, mean CAC score was 40.7 (156.0) AU, while for W females, mean CAC score was 101.2 (280.8) AU. The mean AA CAC was 37.8, while the mean W age-gender matched CAC score was 146.8. These results were statistically significant with a p-value of 0.001. Additionally, 68.0% of AA patient had a CAC value of 0, whereas 51.4% of age-gender matched W patients had a CAC value of 0. 

Conclusion: Among patients presenting to the emergency department with chest pain, AA patients were more likely to have a lower CAC score compared to their white counterparts. However, based on larger data sets, AA patients are known to have a greater incidence of coronary artery disease (CAD) and a higher risk of early death from CAD. Our data suggests a necessity to avoid overreliance on CAC score for risk stratification of AA patients. Further larger group-based studies are needed to enhance evaluation of CAD in the AA patient population to improve preventative cardiovascular management. 


Racial Variations in Coronary Artery Calcium Scores among Patients Presenting to the Emergency Department with Chest Pain

Background:
Surgical Aortic Valve Replacement (SAVR) is the current treatment of choice for good surgical candidates with moderate to severe symptomatic. As TAVR showed an improved 1and 2-year all-cause mortality, it has been opted for moderately symptomatic severe AS patients. The purpose of this review was to do a clinical comparison of TAVR vs SAVR and to analyze the Health Index Factor that makes TAVR a treatment of choice in asymptomatic AS patients. 

Methods:
An extensive literature review of PubMed, Cochrane, and Embase databases was performed using the key words “Aortic stenosis”, “SAVR”, “TAVR”, and “Asymptomatic”. A total of 45 prospective randomized clinical trials in English language that were published from year 2000 onwards were included in the final analysis. 

Results:
Strang G et al found that 59.3% of the asymptomatic AS patients are likely to die in the next 5 years without proactive treatment. Multiple studies have proven that early intervention with aortic valve replacement is superior to conservative treatment in severe asymptomatic AS, however, the choice between SAVR and TAVR is not well established. NOTION Trial, SURTAVI Trail, and PARTNER 3 study showed non-inferiority of TAVR over SAVR, within a 1-year follow-up for low surgical risk patients. Evolut Low-risk study is the only prospective study performed to date that enrolled patients with asymptomatic severe AS. The Trial demonstrated that there was no difference in all-cause mortality at 30 days (1.3% vs 4.8%. p=0.23), and 12 days (1.3% vs 6.5%, p=0.11). Additionally, TAVR also decreases the risk of post-procedural atrial fibrillation,acute kidney injury rehospitalization and has shown significant improvement in mean trans-aortic pressure gradient. TAVR also showed marked improvement in 30 day Quality of Life (QOL) index, where SAVR didn’t report any significant change in the QOL index.

Conclusion:
TAVR has consistently shown a statistically non-significant difference in case mortality, risk of stroke, and rehospitalization in patients with high and moderate surgical risk, whereby recent initial trials have shown significant improvement in the QOL index and hemodynamic index for patients with asymptomatic disease. More extensive studies are required to prove the feasibility and long term outcomes of the TAVR in asymptomatic patients.





Role of Trans-Catheter Aortic Valve Replacement in Asymptomatic Aortic Stenosis- Feasibility Analysis

Background: Sodium-glucose cotransporter 2 inhibitors (SGLT-2Is) have proven their efficacy in managing patients with heart failure (HF), yet within this broad family identifying an effective single agent is still controversial. Therefore, we conducted a network meta-analysis to investigate which SGLT-2Is is more effective in patients with HF.

Methods: PubMed, Web of Science, Scopus, and Embase, were systematically searched from inception to February 2022. We included randomized controlled trials (RCTs) that investigated the usage of SGLT-2Is versus placebo in heart failure patients. Main outcomes were all-cause, cardiovascular mortality, serious adverse events, and hospitalization due to HF. The random-effects method model and inverse variance statistics were used to calculate the odds ratio (OR) with a 95% confidence interval (CI).

Results: Our study included 12 RCTs with a total number of 69,024 patients (37,923 in the SGLT2 inhibitors group and 31,101 in the placebo group). Five RCTs used Empagliflozin, four used Dapagliflozin, and one used Canagliflozin, Ertugliflozin, and Sotagliflozin, respectively. Our analysis showed that Empagliflozin has a statistically significant lowest odds for both cardiovascular mortality and serious adverse effects (OR: 0.80 with 95% CI [0.67-0.96]) and (OR: 0.84 with 95% CI [0.76-0.93]), respectively compared to other SGLT-2Is. All SGLT-2Is have been associated with the same lower odds without preferences for one over the others in regard to all-cause mortality. Furthermore, the rate of hospitalization due to HF showed a statistically significant decrease with all of our SGLT-2Is except for canagliflozin, which showed insignificant results with (OR: 0.63 with 95% CI [0.39-1.01]).

Conclusion: Empagliflozin had the lowest odds of cardiovascular mortality and serious adverse effects. Canagliflozin was the only SGLT-2Is that was non-superior to placebo for risk of hospitalization for HF. Meanwhile, no differences between the included SGLT-2Is were observed in terms of all-cause mortality.




Next from AMA Research Challenge 2022

Effect of Race on the incidence of atrial fibrillation post-coronaryartery bypass surgery in a Middle Eastern Community in the United States

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