**Core Concept**
Fat embolism syndrome is a clinical condition characterized by the entry of fat globules into the bloodstream, leading to various systemic complications. It often occurs in patients with severe trauma, particularly those with long bone fractures.

**Why the Correct Answer is Right**
The correct answer, **d) Fat globules in urine**, is a hallmark feature of fat embolism syndrome. Fat globules can be detected in the urine of affected patients due to the breakdown of fat cells and their excretion through the kidneys. This occurs due to the release of lipases from damaged tissue, which breaks down the fat cells into smaller globules that can then enter the bloodstream and eventually be excreted in the urine.

**Why Each Wrong Option is Incorrect**
* **Option A:** Petechiae in the anterior chest wall can be seen in various conditions, including disseminated intravascular coagulation (DIC) and thrombotic thrombocytopenic purpura (TTP). While petechiae can occur in fat embolism syndrome, they are not a specific or sensitive indicator of the condition.
* **Option B:** Bradycardia is not a typical feature of fat embolism syndrome. In fact, patients with fat embolism syndrome often exhibit tachycardia, which is a result of the systemic inflammatory response and hypoxia.
* **Option C:** Fat globules can be detected in the blood of patients with fat embolism syndrome, but they are not typically found in the urine. The correct answer refers specifically to the presence of fat globules in the urine.
* **Option E:** Fat embolism syndrome typically occurs within the first 48-72 hours after trauma, not after the first week. The condition is often seen in patients with severe polytrauma, particularly those with long bone fractures.

**Clinical Pearl / High-Yield Fact**
Fat embolism syndrome is often associated with a high mortality rate, particularly if not recognized and treated promptly. A classic clinical triad of fat embolism syndrome includes respiratory distress, neurological symptoms (such as confusion and seizures), and petechiae or ecchymoses.

**Correct Answer: D. Fat globules in urine**