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Combined Inhaled Pulmonary Vasodilators in Cardiac Surgery: A Scoping Review.

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Combination inhaled vasodilator therapy shows promise for managing pulmonary hypertension during cardiac surgery. While hemodynamic benefits were observed, further research is needed to confirm effects on clinical outcomes and mortality.

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Area of Science:

  • Cardiology
  • Anesthesiology
  • Pulmonary Medicine

Background:

  • Pulmonary hypertension increases risks in cardiac surgery.
  • Inhaled vasodilators may offer benefits over intravenous agents by avoiding systemic hypotension.
  • Evidence for combination therapy in this setting is limited.

Purpose of the Study:

  • To conduct a scoping review on the use of combined inhaled vasodilator agents for pulmonary hypertension and/or right ventricular dysfunction in cardiac surgery patients.
  • To synthesize current evidence on the efficacy and safety of these combination therapies.

Main Methods:

  • Scoping review of literature from MEDLINE, Embase, and Cochrane Central Register of Controlled Trials.
  • Inclusion of studies on adults and children undergoing cardiac surgery treated with combined inhaled vasodilators.
  • Analysis of 23 studies involving 432 patients.

Main Results:

  • Common combinations include nitric oxide or milrinone with prostacyclin analogues.
  • 18 of 23 studies reported improved hemodynamics, reduced pulmonary hypertension, and better right ventricular function.
  • Observed decreases in vasopressor/inotropic support; clinical outcomes like ICU stay and weaning from bypass showed mixed results.
  • No studies reported impact on mortality or overall complications.

Conclusions:

  • Combined inhaled therapies represent a potential treatment for pulmonary hypertension and right ventricular dysfunction in cardiac surgery.
  • Further investigation is necessary to fully understand systemic effects and impact on patient outcomes.
  • More robust studies are required to establish definitive clinical benefits.