Examkin

Soru

Zorluk: ZorPreoperative and Postoperative Care

A 52-year-old male is recovering in the intensive care unit on postoperative day 3 following an open pancreaticoduodenectomy. He has had an uneventful recovery thus far. The surgical team decides to discontinue his right internal jugular central venous catheter. The nurse removes the catheter while the patient is sitting upright in his bed. Immediately after the catheter is pulled, the patient gasps and becomes unresponsive. His blood pressure drops to 65/40 mmHg65/40 \text{ mmHg}, heart rate increases to 138 /min138 \text{ /min}, and oxygen saturation falls to 76%76\% on room air. Auscultation of the chest reveals a loud, churning, machinery-like murmur over the precordium. Arrange the following immediate management steps in the most appropriate chronological order.

  1. 1Apply an occlusive dressing or immediate manual pressure over the insertion site
  2. 2Place the patient in the left lateral decubitus and Trendelenburg position
  3. 3Administer 100%100\% oxygen via a high-flow system
  4. 4Initiate aggressive intravenous fluid resuscitation

Cevap

The correct sequence is to first apply an occlusive dressing over the insertion site, followed by placing the patient in the left lateral decubitus and Trendelenburg position (Durant maneuver), then administering 100% oxygen, and finally initiating aggressive intravenous fluid resuscitation.
Venous air embolism is a life-threatening complication of central venous catheter removal, especially when incorrectly performed with the patient in an upright position (which increases the negative pressure gradient). The patient's sudden shock, hypoxia, and pathognomonic 'mill-wheel' murmur strongly suggest this diagnosis. The immediate priority is source control by manually occluding the site or applying an occlusive dressing. Once further air entry is stopped, the patient must be placed in the left lateral decubitus and Trendelenburg position (Durant maneuver) to displace the air bubble away from the right ventricular outflow tract. Subsequent steps focus on reducing the size of the embolus via nitrogen washout with 100%100\% oxygen and providing hemodynamic support with intravenous fluids to maintain cardiac output.

Adım Adım Çözüm

1
Apply an occlusive dressing over the insertion site.
Arrests the source of air entry.
A venous air embolism occurs due to a negative pressure gradient drawing air into the vein. Occluding the open tract immediately stops further entrainment of air, which is the most critical initial life-saving step.
2
Place the patient in the left lateral decubitus and Trendelenburg position.
Traps the air bubble in the right ventricular apex.
Known as the Durant maneuver, this specific positioning prevents the air embolus from obstructing the right ventricular outflow tract and pulmonary artery, immediately rescuing pulmonary circulation.
3
Administer 100%100\% oxygen.
Accelerates nitrogen washout.
An air embolus is primarily composed of nitrogen gas. Providing 100%100\% high-flow oxygen creates a strong diffusion gradient that encourages nitrogen to diffuse out of the bubble and into the alveoli, shrinking the embolus while also treating hypoxemia.
4
Initiate intravenous fluid resuscitation.
Increases central venous pressure.
Aggressive fluid administration provides necessary hemodynamic support for obstructive shock and elevates venous pressure, which further prevents any additional air from entering the venous system.

Anahtar Kavram

Management of venous air embolism requires immediate source control, specialized patient positioning (Durant maneuver) to relieve right ventricular outflow obstruction, and high-flow oxygen to shrink the nitrogen-rich air bubble.
Tahmini Süre:1m 30s
Bu soruyu puanla

Konular

Preoperative and Postoperative Care

Bu konudan daha fazla soru