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Related Experiment Video

Updated: Dec 15, 2025

Author Spotlight: Unraveling the Impact of Mechanical Ventilation on Diaphragm Function and Patient Outcomes
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Diaphragmatic Dysfunction After Elective Cardiac Surgery: A Prospective Observational Study.

Andrea Bruni1, Eugenio Garofalo1, Laura Pasin2

  • 1Anesthesia and Intensive Care, Department of Medical and Surgical Sciences, Magna Graecia University, Catanzaro, Italy.

Journal of Cardiothoracic and Vascular Anesthesia
|July 13, 2020
PubMed
Summary

Postoperative diaphragm dysfunction is common after cardiac surgery, impacting patient recovery. This condition, diagnosed via ultrasound, is linked to longer intensive care unit stays and difficult weaning.

Keywords:
cardiac surgerycardiopulmonary bypassdiaphragm dysfunctionmechanical ventilationweaning

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Area of Science:

  • Medical research
  • Pulmonology
  • Critical care medicine

Background:

  • Diaphragm dysfunction is a potential complication following cardiac surgery.
  • Early identification and understanding of diaphragm dysfunction are crucial for improving patient outcomes.

Purpose of the Study:

  • To determine the incidence of postoperative diaphragm dysfunction using ultrasonography.
  • To explore the association between diaphragm dysfunction and clinical outcomes after cardiac surgery.

Main Methods:

  • Prospective observational study involving 100 patients undergoing elective cardiac surgery.
  • Diaphragm ultrasound assessed diaphragm displacement, thickness, and thickening fraction at multiple timepoints: pre-surgery, during spontaneous breathing trials, 24 hours post-surgery, and at ICU discharge.
  • Primary outcome: diaphragm dysfunction defined as a thickening fraction <20% at the first spontaneous breathing trial.

Main Results:

  • Thirty-eight patients (38%) exhibited diaphragm dysfunction at the first spontaneous breathing trial, which resolved over time.
  • No significant differences in preoperative characteristics were found between patients with and without diaphragm dysfunction.
  • Longer cardiopulmonary bypass duration was associated with diaphragm dysfunction. Patients with dysfunction had higher rates of difficult weaning, lower extubation rates, and longer ICU stays.

Conclusions:

  • The incidence of postoperative diaphragm dysfunction after elective cardiac surgery is high.
  • Postoperative diaphragm dysfunction may contribute to prolonged intensive care unit length of stay and complicate patient weaning.