Changes in rate-pressure product associated with pregnancy.

BACKGROUND: In nonpregnant individuals, the rate-pressure product, the product of heart rate and systolic blood pressure, is used as a noninvasive surrogate of myocardial O2 consumption during cardiac stress testing. Pregnancy is considered a physiological cardiovascular stress test. Evidence describing the impact of pregnancy on myocardial O2 demand, as assessed by the rate-pressure product, is limited. OBJECTIVE: This study aimed to describe changes in the rate-pressure product for each pregnancy trimester, during labor and delivery, and the postpartum period among low-risk pregnancies. STUDY DESIGN: This was a retrospective cohort study that assessed uncomplicated pregnancies delivered vaginally at term. We collected rate-pressure product (heart rate × systolic blood pressure) values preconception, during pregnancy for each trimester (at ≤13 weeks + 6/7 days, at 14 weeks + 0/7 days through 27 weeks + 6/7 days, and at ≥28 weeks + 0/7 days), during the labor and delivery encounter (hospital admission until complete cervical dilation, complete cervical dilation until placental delivery, and after placental delivery until hospital discharge), and during the outpatient postpartum visit at 2 to 6 weeks after delivery. We calculated the percentage change at each time point from the preconception rate-pressure product (delta rate-pressure product). We used a mixed-linear model to analyze differences in the mean delta rate-pressure product over time and the influence of prepregnancy age, prepregnancy body mass index, and neuraxial anesthesia status during labor and delivery on these estimates. RESULTS: Our cohort comprised 316 patients. The mean rate-pressure product increased significantly from preconception starting at the third trimester of pregnancy and during labor and delivery (P≤.05). The mean delta rate-pressure product peaked at 12% and 38% in the third trimester and during labor and delivery, respectively. Prepregnancy body mass index was inversely correlated with the mean delta rate-pressure product changes (estimate, -0.308; 95% confidence interval, -0.536 to -0.80; P=.008). In contrast, neither the prepregnancy age, nor neuraxial anesthesia status during labor had a significant influence on this parameter. CONCLUSION: This study validates the transient but significant increase in the rate-pressure product, a clinical estimate of myocardial O2 demand, during uncomplicated pregnancies delivered vaginally at term. Pregnant individuals with lower prepregnancy body mass index experienced a sharper increase in this parameter. Patients who receive neuraxial anesthesia during labor and delivery experience similar changes in the rate-pressure product as those who did not.

Most hospitalized patients with significant tricuspid regurgitation have advanced disease preventing transcatheter tricuspid valve intervention.

BACKGROUND: More than moderate tricuspid regurgitation (TR) is associated with high mortality. Surgical tricuspid valve repair and replacements are rarely performed due to high operative mortality risk, mainly attributed to late presentation. Novel transcatheter tricuspid valve intervention (TTVI) devices are being developed as an alternative to surgery. The population of patients presenting to tertiary care centers who can benefit from TTVI has not been well defined. METHODS: We retrospectively analyzed 12,677 consecutive 2D echocardiograms completed at our tertiary care center between March 2021 and March 2022 and identified hospitalized patients with more than moderate TR. A total of 569 patients were included in this study. Clinical and echocardiographic data were collected by individual chart review. We used the European Society of Cardiology (ESC) guidelines on the management of valvular disease to retrospectively assign patients to medical, surgical, or transcatheter therapy. RESULTS: 458 patients (80.5 %) were assigned to medical therapy, 57 (10.0 %) were assigned to TTVI, and 54 (9.5 %) were assigned to tricuspid valve surgery. Of note, 75.7 % (431/569) of patients were precluded from any intervention due to advanced disease, and only 4.7 % (27/569) presented too early for intervention, being both asymptomatic and without RV dilatation. CONCLUSION: Only 10.0 % of patients presenting to a tertiary care center with significant TR would be candidates for TTVI when these technologies are approved in the United States. Earlier identification and treatment of TR could increase the number of patients who may benefit from interventions including TTVI.

Global Longitudinal Strain as Predictor of Inducible Ischemia in No Obstructive Coronary Artery Disease in the CIAO-ISCHEMIA Study.

BACKGROUND: Global longitudinal strain (GLS) is a sensitive marker for identifying subclinical myocardial dysfunction in obstructive coronary artery disease (CAD). Little is known about the relationship between GLS and ischemia in patients with myocardial ischemia and no obstructive CAD (INOCA). OBJECTIVES: To investigate the relationship between resting GLS and ischemia on stress echocardiography (SE) in patients with INOCA. METHODS: Left ventricular GLS was calculated offline on resting SE images at enrollment (n = 144) and 1-year follow-up (n = 120) in the CIAO-ISCHEMIA (Changes in Ischemia and Angina over One year in International Study of Comparative Health Effectiveness with Medical and Invasive Approaches trial screen failures with no obstructive CAD on computed tomography [CT] angiography) study, which enrolled participants with moderate or severe ischemia by local SE interpretation (≥3 segments with new or worsening wall motion abnormality and no obstructive (<50% stenosis) on coronary computed tomography angiography. RESULTS: Global longitudinal strain values were normal in 83.3% at enrollment and 94.2% at follow-up. Global longitudinal strain values were not associated with a positive SE at enrollment (GLS = -21.5% positive SE vs GLS = -19.9% negative SE, P = .443) or follow-up (GLS = -23.2% positive SE vs GLS = -23.1% negative SE, P = .859). Significant change in GLS was not associated with positive SE in follow-up (P = .401). Regional strain was not associated with colocalizing ischemia at enrollment or follow-up. Changes in GLS and number of ischemic segments from enrollment to follow-up showed a modest but not clinically meaningful correlation (ß = 0.41; 95% CI, 0.16, 0.67; P = .002). CONCLUSIONS: In this cohort of INOCA patients, resting GLS values were largely normal and did not associate with the presence, severity, or location of stress-induced ischemia. These findings may suggest the absence of subclinical myocardial dysfunction detectable by echocardiographic strain analysis at rest in INOCA.

Patient-Prosthesis Mismatch in Pregnancy: A Multidisciplinary Approach.

A 24-year-old gravida 3 para 1 woman with history of bioprosthetic aortic valve replacement complicated by patient-prosthesis mismatch presented for prenatal care. Her pregnancy was managed by a multidisciplinary cardio-obstetrics team, resulting in an uncomplicated repeat cesarean section at term.

A Tale of Two Evils: Iatrogenic Propagation of Spontaneous Coronary Artery Dissection.

Spontaneous coronary artery dissection (SCAD) is a non-traumatic and non-iatrogenic intimal separation of the coronary arterial wall. While poorly understood, its mechanism confers higher prevalence in younger females, and it is responsible for 25% of acute coronary syndromes (ACS) in women under 50 years of age. SCAD is primarily diagnosed via coronary angiography; however, intraluminal contrast injection and percutaneous coronary interventions (PCI) are associated with an increased risk of propagation and extension of the dissection leading to increased risk of morbidity and mortality. We present the case of a 48-year-old female with multivessel SCAD and subsequent iatrogenic dissection following contrast injection requiring multiple PCI for medical treatment of refractory cardiac angina.

Racial and Ethnic Differences in the Clinical Diagnosis of Aortic Stenosis.

Background Racial and ethnic minority groups are underrepresented among patients undergoing aortic valve replacement in the United States. We evaluated the impact of race and ethnicity on the diagnosis of aortic stenosis (AS). Methods and Results In patients with transthoracic echocardiography (TTE)-confirmed AS, we assessed rates of AS diagnosis as defined by assignment of an International Classification of Diseases, Ninth Revision (ICD-9) and Tenth Revision (ICD-10) code for AS within a large multicenter electronic health record. Multivariable Cox proportional hazard and competing risk regression models were used to evaluate the 1-year rate of AS diagnosis by race and ethnicity. Among 14 800 patients with AS, the 1-year diagnosis rate for AS following TTE was 37.4%. Increasing AS severity was associated with an increased likelihood of receiving an AS diagnosis (moderate: hazard ratio [HR], 3.05 [95% CI, 2.86-3.25]; P<0.0001; severe: HR, 4.82 [95% CI, 4.41-5.28]; P<0.0001). Compared with non-Hispanic White, non-Hispanic Black (HR, 0.65 [95% CI, 0.54-0.77]; P<0.0001) and non-Hispanic Asian individuals (HR, 0.72 [95% CI, 0.57-0.90], P=0.004) were less likely to receive a diagnosis of AS. Additional factors associated with a decreased likelihood of receiving an AS diagnosis included a noncardiology TTE ordering provider (HR, 0.92 [95% CI, 0.86-0.97]; P=0.005) and TTE performed in the inpatient setting (HR, 0.72 [95% CI, 0.66-0.78]; P<0.0001). Conclusions Rates of receiving an ICD diagnostic code for AS following a diagnostic TTE are low and vary significantly by race and ethnicity and disease severity. Further studies are needed to determine if efforts to maximize the clinical recognition of TTE-confirmed AS may help to mitigate disparities in treatment.

Indexing Left Atrial Volumes: Alternative Indexing Methods Better Predict Outcomes in Overweight and Obese Populations.

BACKGROUND: Left atrial volume (LAV) is often adjusted for body surface area (BSA). In overweight individuals this may result in underestimation of left atrial (LA) dilation. The authors investigated whether alternative indexing techniques better predict mortality and cardiovascular (CV) events. OBJECTIVES: The purpose of this study was to evaluate the efficacy of different methods of indexing LAV in predicting mortality and CV events across a range of body sizes. METHODS: LAV was adjusted for BSA, idealized BSA (iBSA), height, and height-squared (H2) in patients aged over 50 years who underwent outpatient echocardiography and longitudinal follow-up at our institution. LA dilation was categorized using published criteria. Mortality and CV events were assessed via medical records. RESULTS: LAVs were calculated in 17,454 individuals. In this study, 71.2% were overweight or obese. Indexing using iBSA, height, and H2 resulted in reclassification of LA size in up to 28.4% (P < 0.001) compared with indexing using BSA. In severely obese individuals (body mass index [BMI] ≥40 kg/m2), LA dilation indexed for BSA no longer predicted mortality (P = 0.70). Other indexing methods remained predictive of mortality. Height, H2, and iBSA all had greater performance, compared with BSA, for prediction of mortality and CV events in all overweight patients with H2 showing the best overall performance (P < 0.001). Net reclassification index for mortality was significant for all alternative indexing techniques (P < 0.001) and patients whose LA was reclassified from normal to dilated had increased risk of mortality (P < 0.001) and CV events (P < 0.001) across all BMI categories. CONCLUSIONS: LA dilation based on standard indexing using BSA is nondiscriminatory for prediction of mortality in the severely obese. Indexing using height, H2, or iBSA to diagnose LA dilation better predicts mortality in this population and has better overall predictive performance across all overweight and obese populations. Using BSA indexing may lead to underappreciation of LA dilation and underestimation of patients at increased risk.

Trends in Utilization of Aortic Valve Replacement for Severe Aortic Stenosis.

BACKGROUND: Despite the rapid growth of aortic valve replacement (AVR) for aortic stenosis (AS), limited data suggest symptomatic severe AS remains undertreated. OBJECTIVES: This study sought to investigate temporal trends in AVR utilization among patients with a clinical indication for AVR. METHODS: Patients with severe AS (aortic valve area <1 cm2) on transthoracic echocardiograms from 2000 to 2017 at 2 large academic medical centers were classified based on clinical guideline indications for AVR and divided into 4 AS subgroups: high gradient with normal left ventricular ejection fraction (LVEF) (HG-NEF), high gradient with low LVEF (HG-LEF), low gradient with normal LVEF (LG-NEF), and low gradient with low LVEF (LG-LEF). Utilization of AVR was examined and predictors identified. RESULTS: Of 10,795 patients, 6,150 (57%) had an indication or potential indication for AVR, of whom 2,977 (48%) received AVR. The frequency of AVR varied by AS subtype with LG groups less likely to receive an AVR (HG-NEF: 70%, HG-LEF: 53%, LG-NEF: 32%, LG-LEF: 38%, P < 0.001). AVR volumes grew over the 18-year study period but were paralleled by comparable growth in the number of patients with an indication for AVR. In patients with a Class I indication, younger age, coronary artery disease, smoking history, higher hematocrit, outpatient index transthoracic echocardiogram, and LVEF ≥0.5 were independently associated with an increased likelihood of receiving an AVR. AVR was associated with improved survival in each AS-subgroup. CONCLUSIONS: Over an 18-year period, the proportion of patients with an indication for AVR who did not receive AVR has remained substantial despite the rapid growth of AVR volumes.

Echocardiography in Women: How Are Mars and Venus Different?

PURPOSE OF REVIEW: Sex is an important determinant of cardiac structure and function. We review key sex differences in universal echocardiographic parameters and discuss the clinical implications of using sex-specific algorithms to increase the diagnostic accuracy of echocardiography and improve the timely treatment of common cardiovascular disorders, and the unique role of echocardiography in pregnancy and the evaluation of ischemic heart disease. RECENT FINDINGS: Emerging echocardiographic findings have begun to define important sex-based differences in chamber size and ventricular function. We advocate for additional research and the consideration of sex-specific algorithms in future expert consensus guidelines for the diagnosis and treatment of valvular heart disease, heart failure, and thoracic aortic disease. Echocardiography is an essential diagnostic tool in our armamentarium of imaging modalities for the sex-specific diagnosis and guidance of treatment for a broad spectrum of cardiovascular disorders.

Pregnancy in Familial Left Ventricular Noncompaction-Associated Cardiomyopathy.

Left ventricular (LV) noncompaction is a phenotypic variant of LV structure; however, it also can be associated with cardiomyopathies. Pregnancy in the setting of LV dysfunction carries a risk of maternal and fetal morbidity and mortality. Multidisciplinary cardio-obstetrical care is paramount in the management of pregnancy in this unique population. (Level of Difficulty: Intermediate.).

Valvular Heart Disease and Heart Failure in Women.

Valvular heart disease and heart failure remain important causes of cardiovascular disease among women in the United States. Mitral regurgitation, aortic stenosis, and tricuspid regurgitation are the most common valvular lesions among men and women. This review focuses on gender differences in the epidemiology, treatment, and outcomes of mitral regurgitation, aortic stenosis, and tricuspid regurgitation. The authors also review the unique management of valvular heart disease in pregnancy.

Sex Differences in the Management of Advanced Heart Failure.

PURPOSE OF REVIEW: Heart failure (HF) is prevalent among women and remains a leading cause of morbidity and mortality in the United States. Currently, 3 million women live with HF and the prevalence is projected to continue to increase. The purpose of this review is to highlight sex differences in the use and response to evidence-based pharmacological, device, and advanced HF therapies, as well as explore emerging areas of research in sex differences in the treatment of HF. RECENT FINDINGS: Under-representation of women in clinical HF trials has limited our understanding of sex-related differences in the treatment and outcomes of HF. Important sex differences exist in the use of evidence-based HF therapies and clinical response among women with HF. In general, women tend to obtain the same clinical benefit from evidence-based HF drug and device therapies, but the utilization rates of guideline-directed medical therapies remain poor compared to men. Future research efforts should focus on increasing the enrollment of women in HF trials to help gain helpful insight into sex-specific differences in treatment effects and subsequent clinical outcomes.

Right atrial structure and function in patients with hypertension and with chronic heart failure.

BACKGROUND: Prior studies have shown that both heart failure (HF) and atrial fibrillation (AF) are factors that impact left atrial function and structure. However, right atrial (RA) function measured as RA emptying fraction (RAEF) on echocardiography has not been analyzed systematically in a chronic HF population. The aim of this study was to assess RA volume index (RAVI) and RAEF in patients with chronic HF and patients with hypertension (HTN) and to relate these findings to other cardiopulmonary ultrasound parameters and 12-month outcomes. METHODS AND RESULTS: In this prospective observational study, we identified 119 patients with chronic HF (64 patients without a history of AF [HF without AF], 55 with AF [HF with AF]), and 127 patients with HTN but without important cardiac disease who underwent routine outpatient transthoracic echocardiography. We found that RAEF was impaired in patients with HF without AF compared to patients with HTN (35% ±2 vs 50% ±1, P < .001), whereas RAVI did not differ between these two groups. Lower RAEF was associated with larger RAVI and higher estimated RA pressures but not with a higher degree of pulmonary congestion by lung ultrasound. Both lower RAEF and higher RAVI were associated with an increased risk of 12-month HF hospitalizations or all-cause death (age, sex, and AF adjusted HR: 4.07, 95% CI: 1.69-9.79; P = .002, vs 2.74, 95% CI: 1.15-6.54, P = .023). CONCLUSIONS: In an outpatient HF cohort, both lower RAEF and increased RAVI were associated with other markers of impaired cardiac function and 12-month adverse events.

Pulmonary Congestion by Lung Ultrasound in Ambulatory Patients With Heart Failure With Reduced or Preserved Ejection Fraction and Hypertension.

BACKGROUND: Although pulmonary congestion can be quantified in heart failure (HF) by means of lung ultrasonography (LUS), little is known about LUS findings (B-lines) in different HF phenotypes. This prospective cohort study investigated the prevalence and clinical and echocardiographic correlates of B-lines in ambulatory HF patients with preserved (HFpEF) or reduced (HFrEF) ejection fraction compared with hypertensive patients. We related LUS findings to 12-month HF hospitalizations and all-cause mortality. METHODS AND RESULTS: We used LUS to examine hypertensive (n = 111), HFpEF (n = 46), and HFrEF (n = 73) patients (median age 66 y, 56% male, 79% white, and median EF 55%) undergoing clinically indicated outpatient echocardiography. B-line number was quantified offline, across 8 chest zones, blinded to clinical and echocardiographic characteristics. The proportion of patients with ≥3 B-lines was lower in hypertensive patients (13.5%) compared with both HFrEF (45.2%, P < .001) and HFpEF (34.8%; P = .05). HF patients with ≥3 B-lines had a higher risk of the composite outcome (age- and sex-adjusted hazard ratio 2.62, 95% confidence interval 1.15-5.96; P = .022). CONCLUSIONS: When performed at the time of outpatient echocardiography, LUS findings of pulmonary congestion differ between patients with known HF and those with hypertension, and may be associated with adverse outcomes.