Sildenafil prevents cardiovascular changes after bone marrow fat embolization in sheep

Area of Science:

• Anesthesiology and Critical Care Medicine
• Cardiovascular Physiology
• Surgical Complications

Background:

• Bone marrow fat embolism is a life-threatening intraoperative complication during orthopedic and spine surgeries.
• Managing cardiovascular deterioration, particularly pulmonary hypertension, presents significant anesthetic challenges.
• Pulmonary vasodilation is a potential strategy for prophylaxis or treatment.

Purpose of the Study:

• To investigate the effect of sildenafil, a phosphodiesterase inhibitor, on cardiovascular deterioration after induced bone marrow fat embolism.
• To evaluate sildenafil's potential as a prophylactic or therapeutic agent against fat embolism syndrome.

Main Methods:

• Bone cement injection into sheep vertebrae to induce fat embolism.
• Continuous monitoring of invasive blood pressures and heart rate.
• Measurement of cardiac output, blood gases, and postmortem analysis of lung fat emboli.

Main Results:

• Fat embolism caused transient increases in pulmonary arterial pressure and central venous pressure, with decreased arterial blood pressure.
• Sildenafil administration prevented significant cardiovascular changes post-embolism.
• Significantly reduced intravascular fat emboli were observed in the lungs of sildenafil-treated sheep compared to controls.

Conclusions:

• Sildenafil effectively prevented acute cardiovascular complications associated with bone marrow fat embolism in a sheep model.
• This suggests a potential therapeutic role for sildenafil in managing fat embolism syndrome during surgery.