What are the most common complications of myocardial infarction? (Select all that apply)
(Select All that Apply.)

A. Veins that are most susceptible to a deep vein thrombosis are the peroneal, posterior tibial, popliteal and superficial femoral: This statement is correct. These veins are indeed among the most common sites for the development of DVT.

B. DVTs tend to mostly occur in the lower extremities but can occur in the upper extremities too: This statement is also correct. While DVTs primarily occur in the lower extremities, they can occur in the upper extremities as well, particularly in individuals with risk factors such as central venous catheters or certain medical conditions.

C. A DVT is a type of venous thromboembolism (VTE), which is a blood clot that starts in the vein: This statement is correct. DVTs are indeed classified as venous thromboembolism, which refers to blood clots that form in the venous system.

D. A deep vein thrombosis in the lower extremity has a low probability of becoming a pulmonary embolism: This statement is incorrect. A deep vein thrombosis in the lower extremity has a significant risk of becoming a pulmonary embolism if a thrombus dislodges and travels to the pulmonary circulation. It is essential to monitor and treat DVTs to reduce the risk of complications like pulmonary embolism.

A. Hospital-acquired pneumonia: Pneumonia that develops 48 hours or more after hospital admission is classified as hospital-acquired pneumonia (HAP). It is caused by pathogens acquired in the hospital setting, often involving multidrug-resistant organisms such as Pseudomonas aeruginosa, Staphylococcus aureus (including MRSA), and Klebsiella pneumoniae. Patients who are intubated, have prolonged hospital stays, or have weakened immune defenses are at higher risk.

B. Immunocompromised pneumonia: Pneumonia in immunocompromised patients occurs due to weakened host defenses, such as in individuals with HIV/AIDS, those undergoing chemotherapy, or transplant recipients on immunosuppressive therapy. While these patients can develop HAP, pneumonia due to opportunistic infections like Pneumocystis jirovecii or fungal infections is categorized separately.

C. Community-acquired pneumonia: Pneumonia acquired outside the hospital or within the first 48 hours of admission is classified as community-acquired pneumonia (CAP). Typical pathogens include Streptococcus pneumoniae, Haemophilus influenzae, and Mycoplasma pneumoniae. CAP is usually less resistant to antibiotics compared to HAP.

D. Viral pneumonia: Pneumonia caused by viral pathogens such as influenza, respiratory syncytial virus (RSV), or SARS-CoV-2 is classified based on the causative agent rather than the setting in which it was acquired. Although viruses can cause both CAP and HAP, the classification of pneumonia is determined by the timing of onset and exposure risks.