An 18-year-old high school football player suffered a torn anterior cruciate ligament (ACL) in the state
playoffs. After undergoing repair, he found it difficult to ambulate with the knee brace. Weighing close to
140 kg (approximately 300 pounds), the athlete found it difficult to stand and balance on one leg. His
mother was unable to support him by herself. After 1 week, the young man began to have increased pain
and swelling in the calf of his affected leg. In the middle of the night, the teen called out to his mother,
complaining of a shortness of breath and unexplained anxiety. His mother called 9-1-1, and he was taken
to a local hospital. In the emergency department, he was diagnosed with a deep vein thrombosis and a
pulmonary embolism. Oxygen and low-molecular–weight heparin were administered, and the young
man was admitted to the intensive care unit.
As a result of the thrombus lodging in the pulmonary circulation, the sympathetic nervous system is
activated. Hemodynamically, this results in:
1. Vasodilatation
2. Embolization
3. Decreased pulmonary artery pressure
4. Right heart failure
Answer: Hemodynamically, this results in right heart failure. When a thrombus lodges in the pulmonary
circulation inflammatory mediators and neurohumoral substances are released. This causes widespread
vasoconstriction. This obstructs blood flow to the lung. Embolization is the process of occluding a blood
vessel by purposefully introducing emboli. This results in increased pulmonary artery pressures and can
lead to right heart failure.
The young man suffers an infarction or death of a portion of his lung tissue. Absent blood flow to a lung
segment causes:
1. Surfactant impairment
2. Absorption atelectasis
3. Collateral ventilation of the alveoli
4. Bronchiectasis
Answer: Absent blood flow to lung segment causes surfactant impairment. A decrease production or
inactivation of surfactant leads to atelectasis, which causes hypoxia. Without normal surfactant, the
This study source was downloaded by 100000887154819 from CourseHero.com on 08-17-2024 10:30:28 GMT -05:00
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller YourAssignmentHandlers. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $14.99. You're not tied to anything after your purchase.