RV contractility and exercise-induced pulmonary hypertension in chronic mountain sickness: a stress echocardiographic and tissue Doppler imaging study

Pratali, Lorenza; Allemann, Yves; Rimoldi, Stefano; Faita, Francesco; Hutter, Damian; Rexhaj, Emrush; Brenner, Roman; Bailey, Damian M; Sartori, Claudio; Salmon, Carlos Salinas; Villena, Mercedes; Scherrer, Urs; Picano, Eugenio; Sicari, Rosa (2013). RV contractility and exercise-induced pulmonary hypertension in chronic mountain sickness: a stress echocardiographic and tissue Doppler imaging study. JACC. Cardiovascular imaging, 6(12), pp. 1287-1297. Elsevier 10.1016/j.jcmg.2013.08.007

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OBJECTIVES The aim of this study was to evaluate right ventricular (RV) and left ventricular function and pulmonary circulation in chronic mountain sickness (CMS) patients with rest and stress echocardiography compared with healthy high-altitude (HA) dwellers. BACKGROUND CMS or Monge's disease is defined by excessive erythrocytosis (hemoglobin >21 g/dl in males, 19 g/dl in females) and severe hypoxemia. In some cases, a moderate or severe increase in pulmonary pressure is present, suggesting a similar pathogenesis of pulmonary hypertension. METHODS In La Paz (Bolivia, 3,600 m sea level), 46 CMS patients and 40 HA dwellers of similar age were evaluated at rest and during semisupine bicycle exercise. Pulmonary artery pressure (PAP), pulmonary vascular resistance, and cardiac function were estimated by Doppler echocardiography. RESULTS Compared with HA dwellers, CMS patients showed RV dilation at rest (RV mid diameter: 36 ± 5 mm vs. 32 ± 4 mm, CMS vs. HA, p = 0.001) and reduced RV fractional area change both at rest (35 ± 9% vs. 43 ± 9%, p = 0.002) and during exercise (36 ± 9% vs. 43 ± 8%, CMS vs. HA, p = 0.005). The RV systolic longitudinal function (RV-S') decreased in CMS patients, whereas it increased in the control patients (p < 0.0001) at peak stress. The RV end-systolic pressure-area relationship, a load independent surrogate of RV contractility, was similar in CMS patients and HA dwellers with a significant increase in systolic PAP and pulmonary vascular resistance in CMS patients (systolic PAP: 50 ± 12 mm Hg vs. 38 ± 8 mm Hg, CMS vs. HA, p < 0.0001; pulmonary vascular resistance: 2.9 ± 1 mm Hg/min/l vs. 2.2 ± 1 mm Hg/min/l, p = 0.03). Both groups showed comparable systolic and diastolic left ventricular function both at rest and during stress. CONCLUSIONS Comparable RV contractile reserve in CMS and HA suggests that the lower resting values of RV function in CMS may represent a physiological adaptation to chronic hypoxic conditions rather than impaired RV function. (Chronic Mountain Sickness, Systemic Vascular Function [CMS]; NCT01182792).

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Department of Cardiovascular Disorders (DHGE) > Clinic of Cardiology

UniBE Contributor:

Allemann, Yves; Rimoldi, Stefano; Rexhaj, Emrush and Brenner, Roman

Subjects:

600 Technology > 610 Medicine & health

ISSN:

1936-878X

Publisher:

Elsevier

Language:

English

Submitter:

Stefano Rimoldi

Date Deposited:

11 May 2016 09:26

Last Modified:

11 May 2016 09:26

Publisher DOI:

10.1016/j.jcmg.2013.08.007

PubMed ID:

24269266

Uncontrolled Keywords:

CMS; E; E/e′; HA; Hb; LV; PAP; RV; RV-ESPAR; RV-S′; TDI; chronic mountain sickness; exercise echocardiography; e′; hemoglobin; high altitude; left ventricular; peak early diastolic tissue Doppler imaging velocity of the mitral annulus; peak velocity of early mitral inflow; pulmonary arterial pressure; ratio of early (e′) and late (a′) diastolic tissue Doppler imaging tricuspid peak annular velocities; ratio of peak velocity of early mitral inflow to mitral annular early diastolic peak velocity; right ventricular; right ventricular end-systolic pressure-area relationship; right ventricular function; systolic pulmonary hypertension; tissue Doppler imaging; tissue Doppler imaging peak systolic velocity of the lateral tricuspid valve annulus; tric e′/a′

BORIS DOI:

10.7892/boris.43126

URI:

https://boris.unibe.ch/id/eprint/43126

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