The definition of pulmonary hypertension: history, practical implications and current controversies

Emerging multimodality imaging techniques for the pulmonary circulation

Pulmonary hypertension (PH) remains a challenging condition to diagnose, classify and treat. Current approaches to the assessment of PH include echocardiography, ventilation/perfusion scintigraphy, cross-sectional imaging using computed tomography and magnetic resonance imaging, and right heart catheterisation. However, these approaches only provide an indirect readout of the primary pathology of the disease: abnormal vascular remodelling in the pulmonary circulation. With the advent of newer imaging techniques, there is a shift toward increased utilisation of noninvasive high-resolution modalities that offer a more comprehensive cardiopulmonary assessment and improved visualisation of the different components of the pulmonary circulation. In this review, we explore advances in imaging of the pulmonary vasculature and their potential clinical translation. These include advances in diagnosis and assessing treatment response, as well as strategies that allow reduced radiation exposure and implementation of artificial intelligence technology. These emerging modalities hold the promise of developing a deeper understanding of pulmonary vascular disease and the impact of comorbidities. They also have the potential to improve patient outcomes by reducing time to diagnosis, refining classification, monitoring treatment response and improving our understanding of disease mechanisms.

Pulmonary arterial wedge pressure in healthy subjects: a meta-analysis

Based on current international guidelines, pulmonary arterial wedge pressure (PAWP) is critical for differentiating between pre- and post-capillary pulmonary hypertension (PH) and plays an important role in the diagnosis of left heart failure [1, 2]. The current PAWP threshold to define post-capillary PH is >15 mmHg, measured by right heart catheterisation (RHC) in the supine position [1]. Historical data suggest that the upper limit of physiological PAWP may be lower [3–5], although no systematic review and meta-analysis has investigated the normal range of PAWP considering major confounding factors. We aimed to fill this knowledge gap by assessing the normal value of PAWP based on the largest available database of the published literature on pulmonary haemodynamics, also taking into account possible confounding factors, such as age, sex and RHC methodology.

Based on invasive haemodynamic measurements in healthy subjects, the upper limit of normal of PAWP in the supine resting position is 13 mmHg, which is dependent on sex, but independent of age and pressure reading https://bit.ly/3zer5cZ

Challenging in pulmonary thromboembolism diagnosis in patients with disproportionate pulmonary hypertension and severe mitral stenosis: Report of two cases

KEY CLINICAL MESSAGE

Before valvular interventions, echocardiography, especially the TEE or the ventilation/perfusion scan, should be performed to detect silent PTE and set a more accurate treatment and surgical plan.

ABSTRACT

Pulmonary hypertension (PH) is a progressive and critical disease that can be caused by mitral stenosis (MS). Some of these patients present with disproportionate PH, which is an uncommon phenomenon and is considered a challenging diagnostic and treatment process. In these patients, other causes may also play a role in developing PH. This report presented two cases with disproportionate PH and severe MS who were scheduled for percutaneous mitral valvuloplasty (PMV). The pre-procedural echocardiography revealed systolic pulmonary artery pressure (sPAP) of 90 and 120 mmHg, mitral valve area of 0.80 and 0.55 cm2 by three-dimensional (3D) planimetry, and diastolic pressure gradient (DPG) of 13 and 18.8 mmHg, respectively. Furthermore, in the first patient, 3D transesophageal echocardiography (TEE) revealed multiple saddle-type organized thrombi in the proximal parts of the right and left pulmonary arteries, extending to the distal branches. In the second patient, 3D TEE revealed a large, relatively fresh, flow-limiting thrombosis in the proximal part of the right pulmonary artery. The diagnosis of pulmonary thromboembolism (PTE) in both patients was confirmed by CT angiography. In both patients, the valves were surgically repaired, while all thrombi were removed from the cardiac chambers and pulmonary vessels during surgery. In addition, patients underwent warfarin therapy orally. They were followed up 6 months after the intervention, and their clinical symptoms had improved significantly.

Low Rates of Reproductive Counseling Documentation in Women With Interstitial Pneumonia With Autoimmune Features

BACKGROUND/OBJECTIVE

Women with interstitial pneumonia with autoimmune features (IPAFs), a subset of interstitial lung disease (ILD), are at risk for pregnancy complications. Family planning discussions improve pregnancy outcomes in women with ILD. The objective of this study was to evaluate the documentation of reproductive counseling in IPAF female patients of childbearing age by pulmonary and rheumatology providers at an academic medical center.

METHODS

We conducted a medical record review study of pulmonary and rheumatology encounters in reproductive-aged women with IPAF to evaluate documentation of family planning discussions and contraceptive use. We used nonparametric measures of association and logistic regression to evaluate the relationship between patient characteristics and the presence of reproductive counseling documentation by providers.

RESULTS

Thirty-one women met IPAF classification and were ≤50 years at initial ILD clinic visit. Twenty-five (81%) of these women had risk factors for adverse pregnancy outcomes. Ten women (32%) had a record of reproductive counseling during any visit with their pulmonary provider. Of the 21 patients who also saw a rheumatology provider, 12 (57%) women had a record of reproductive counseling during any visit with their rheumatology provider. No baseline characteristics were associated with odds of reproductive counseling documentation.

CONCLUSIONS

Neither pulmonary nor rheumatology providers consistently discussed family planning/contraceptive use with reproductive-aged women with IPAF. There was a trend for rheumatology providers to discuss reproductive issues with IPAF patients more frequently than pulmonary providers. Efforts should focus on educating providers about the need for reproductive counseling in women with IPAF of childbearing age.

Diastolic Dysfunction Is Unmasked on Exercise in Patients With Asymptomatic, Severe Aortic Stenosis: An Invasive Hemodynamic Study

BACKGROUND

Optimal timing of aortic valve replacement remains difficult in patients with asymptomatic, severe aortic stenosis (AS). More accurate diagnostic methods are warranted for the detection of subtle ventricular impairment. We aimed to evaluate diastolic function in asymptomatic patients with severe AS.

METHODS

In this cross-sectional study, patients with asymptomatic, severe AS were evaluated with right heart catheterization at rest and during moderate exercise. The patients also underwent cardiopulmonary exercise testing to objectify functional capacity and confirm the absence of symptoms.

RESULTS

Between February 2019 and May 2021, we included 50 patients aged 70±12 years. The patients had severe AS with peak velocity 4.4±0.4 m/s, mean gradient 46±9 mm Hg, and an indexed valve area of 0.47±0.08 cm² at rest. All patients were asymptomatic and had normal left ventricular ejection fraction. Five patients had postcapillary pulmonary hypertension at rest. During exercise, 44 patients (88%) had an increase in the mean pulmonary artery pressure per increase in cardiac output of >3 mm Hg/L per minute, of whom 93% had a concomitant increase in the pulmonary artery wedge pressure per increase in cardiac output >2 mm Hg/L per minute, suggesting exercise-induced pulmonary hypertension due to left heart disease. Female gender and increasing age were associated with a higher increase in the pulmonary artery wedge pressure per increase in cardiac output ratio. The catheterization was well tolerated, and there were no adverse events.

CONCLUSIONS

A large proportion of asymptomatic patients with severe, degenerative AS have exercise-induced postcapillary pulmonary hypertension.

Disease definitions in respiratory and sleep medicine: changes in diagnostic criteria and categories over time and clinical implications

The latest issue of Breathe focuses on disease definitions in respiratory and sleep medicine: read the introductory editorial by Chief Editor @ClaudiaCDobler https://bit.ly/3A7CeYj.