Pulmonary hypertension during exercise underlies unexplained exertional dyspnoea in patients with Type 2 diabetes

Eur J Prev Cardiol. 2023 Jan 11;30(1):37-45. doi: 10.1093/eurjpc/zwac153.

Abstract

Aims: To compare the cardiac function and pulmonary vascular function during exercise between dyspnoeic and non-dyspnoeic patients with Type 2 diabetes mellitus (T2DM).

Methods and results: Forty-seven T2DM patients with unexplained dyspnoea and 50 asymptomatic T2DM patients underwent exercise echocardiography combined with ergospirometry. Left ventricular (LV) function [stroke volume, cardiac output (CO), LV ejection fraction, systolic annular velocity (s')], estimated LV filling pressures (E/e'), mean pulmonary arterial pressures (mPAPs) and mPAP/COslope were assessed at rest, low- and high-intensity exercise with colloid contrast. Groups had similar patient characteristics, glycemic control, stroke volume, CO, LV ejection fraction, and E/e' (P > 0.05). The dyspnoeic group had significantly lower systolic LV reserve at peak exercise (s') (P = 0.021) with a significant interaction effect (P < 0.001). The dyspnoeic group also had significantly higher mPAP and mPAP/CO at rest and exercise (P < 0.001) with significant interaction for mPAP (P < 0.009) and insignificant for mPAP/CO (P = 0.385). There was no significant difference in mPAP/COslope between groups (P = 0.706). However, about 61% of dyspnoeic vs. 30% of non-dyspnoeic group had mPAP/COslope > 3 (P = 0.009). The mPAP/COslope negatively predicted V̇O2peak in dyspneic group (β = -1.86, 95% CI: -2.75, -0.98; multivariate model R2:0.54).

Conclusion: Pulmonary hypertension and less LV systolic reserve detected by exercise echocardiography with colloid contrast underlie unexplained exertional dyspnoea and reduced exercise capacity in T2DM.

Keywords: Diabetes; Echocardiography; Heart; Pulmonary arterial pressure; Shortness of breath.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Diabetes Mellitus, Type 2* / complications
  • Diabetes Mellitus, Type 2* / diagnosis
  • Dyspnea / diagnosis
  • Dyspnea / etiology
  • Exercise Test / methods
  • Humans
  • Hypertension, Pulmonary* / diagnostic imaging
  • Hypertension, Pulmonary* / etiology
  • Stroke Volume
  • Ventricular Dysfunction, Left* / diagnostic imaging
  • Ventricular Dysfunction, Left* / etiology
  • Ventricular Function, Left