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Aim This clinical practice guideline for the evaluation and diagnosis of chest pain provides recommendations and algorithms for clinicians to assess and diagnose chest pain in adult patients. Methods A comprehensive literature search was conducted from November 11, 2017, to May 1, 2020, encompassing randomized and nonrandomized trials, observational studies, registries, reviews, and other evidence conducted on human subjects that were published in English from PubMed, EMBASE, the Cochrane Collaboration, Agency for Healthcare Research and Quality reports, and other relevant databases. Additional relevant studies, published through April 2021, were also considered. Structure Chest pain is a frequent cause for emergency department visits in the United States. The “2021 AHA/ACC/ASE/CHEST/SAEM/SCCT/SCMR Guideline for the Evaluation and Diagnosis of Chest Pain” provides recommendations based on contemporary evidence on the assessment and evaluation of chest pain. This guideline presents an evidence-based approach to risk stratification and the diagnostic workup for the evaluation of chest pain. Cost-value considerations in diagnostic testing have been incorporated, and shared decision-making with patients is recommended.

Aim This executive summary of the hypertrophic cardiomyopathy clinical practice guideline provides recommendations and algorithms for clinicians to diagnose and manage hypertrophic cardiomyopathy in adult and pediatric patients as well as supporting documentation to encourage their use. Methods A comprehensive literature search was conducted from January 1, 2010, to April 30, 2020, encompassing studies, reviews, and other evidence conducted on human subjects that were published in English from PubMed, EMBASE, the Cochrane Collaboration, Agency for Healthcare Research and Quality reports, and other relevant databases. Structure Many recommendations from the earlier hypertrophic cardiomyopathy guidelines have been updated with new evidence or a better understanding of earlier evidence. This summary operationalizes the recommendations from the full guideline and presents a combination of diagnostic work-up, genetic and family screening, risk stratification approaches, lifestyle modifications, surgical and catheter interventions, and medications that constitute components of guideline directed medical therapy. For both guideline-directed medical therapy and other recommended drug treatment regimens, the reader is advised to follow dosing, contraindications and drug-drug interactions based on product insert materials.

Since 1980, the American College of Cardiology (ACC) and American Heart Association (AHA) have translated scientific evidence into clinical practice guidelines with recommendations to improve cardiovascular health [(1)][1]. These guidelines, based on systematic methods to evaluate and classify

Glenn N. Levine, MD, FACC, FAHA, Chair Patrick T. O’Gara, MD, MACC, FAHA, Chair-Elect Jonathan L. Halperin, MD, FACC, FAHA, Immediate Past Chair [¶][1] Sana M. Al-Khatib, MD, MHS, FACC, FAHA Joshua A. Beckman, MD, MS, FAHA Kim K. Birtcher, MS, PharmD, AACC Biykem Bozkurt, MD, PhD, FACC

Glenn N. Levine, MD, FACC, FAHA, Chair Patrick T. O’Gara, MD, MACC, FAHA, Chair-Elect Jonathan L. Halperin, MD, FACC, FAHA, Immediate Past Chair [¶][1] Sana M. Al-Khatib, MD, MHS, FACC, FAHA Joshua A. Beckman, MD, MS, FAHA Kim K. Birtcher, MS, PharmD, AACC Biykem Bozkurt, MD, PhD, FACC

Preamble e472 1. Introduction e473 2. General Principles e475 3. Sinus Tachyarrhythmias e480 4. Nonsinus Focal Atrial Tachycardia and MAT e481 5. Atrioventricular Nodal Reentrant Tachycardia e482 6. Manifest and Concealed Accessory Pathways e483 7. Atrial Flutter e485 8. Junctional Tachycardia e487 9. Special Populations e487

Jonathan L. Halperin, MD, FACC, FAHA, Chair Glenn N. Levine, MD, FACC, FAHA, Chair-Elect Jeffrey L. Anderson, MD, FACC, FAHA, Immediate Past Chair [¶][1] Nancy M. Albert, PhD, RN, FAHA[¶][1] Sana M. Al-Khatib, MD, MHS, FACC, FAHA Kim K. Birtcher, PharmD, AACC Biykem Bozkurt, MD, PhD, FACC

Risk stratification for patients with an asymptomatic Wolff-Parkinson-White (WPW) electrocardiogram (ECG) pattern remains an area of controversy. A 33 year old man with a known history of WPW ECG pattern without prior symptoms presented to the emergency room with palpitations that occurred moments

For 3 decades, the American College of Cardiology (ACC) and the American Heart Association (AHA) have jointly developed clinical practice guidelines in an effort to align patient care with scientific evidence.l The “2015 ACC/AHA/HRS Guideline on the Management of Patients With Supraventricular Tachycardia”2 introduces the latest recommendation classification system Table 1, which has continued to evolve. The present brief commentary summarizes and explains the changes incorporated in the current scheme. More detailed reviews of the evolution of ACC/AHA guideline methodology have been published.1,3-5 View this table: Table 1. ACC/AHA Recommendation System: Applying Class of Recommendation and Level of Evidence to Clinical Strategies, Interventions, Treatments, or Diagnostic Testing in Patient Care* (Updated August 2015) Guideline recommendations are categorized by the Class of Recommendation (COR) and Level of Evidence (LOE). The COR reflects the magnitude of benefit over risk and corresponds to the strength of the recommendation. Class I recommendations are strong and indicate that the treatment, procedure, or intervention is useful and effective and should be performed or administered for most patients under most circumstances. Class II recommendations are weaker, denoting a lower degree of benefit in proportion to risk. Benefit is generally greater for Class Ila (moderate) recommendations and smaller for Class lib (weak) recommendations, for which benefit only marginally exceeds risk. A …

OBJECTIVESThe aim of this study was to determine the changes in sympathetic nerve activity (SNA) after atrioventricular junction (AVJ) ablation in patients with chronic atrial fibrillation (AF).BACKGROUNDPolymorphic ventricular tachycardia (PMVT) has been reported after AVJ ablation in patients paced at a rate of ≤70 beats/min. We hypothesized that AVJ ablation results in sympathetic neural changes that favor the occurrence of PMVT and that pacing at 90 beats/min attenuates these changes.METHODSSympathetic nerve activity, 90% monophasic cardiac action potential duration (APD90), right ventricular effective refractory period (ERP) and blood pressure measurements were obtained in 10 patients undergoing AVJ ablation. Sympathetic nerve activity was analyzed at baseline and during and after successful AVJ ablation for at least 10 min. Data were also collected after ablation at pacing rates of 60 and 90 beats/min. The APD90 and ERP were measured before and after AV block during pacing at 120 beats/min.RESULTSSympathetic nerve activity increased to 134 ± 16% of the pre-ablation baseline value (p < 0.01) after successful AVJ ablation plus pacing at 60 beats/min and decreased to 74 ± 8% of baseline (p < 0.05) with subsequent pacing at 90 beats/min. Both APD90 and ERP increased significantly.CONCLUSIONS1) Ablation of the AVJ followed by pacing at 60 beats/min is associated with an increase in SNA. 2) Pacing at 90 beats/min decreases SNA to or below the pre-ablation baseline value. 3) Cardiac APD and ERP increase after AVJ ablation. The increase in SNA, along with the prolongation in APD, may play a role in the pathogenesis of ventricular arrhythmias that occur after AVJ ablation.