**Question:** A 60-year old obese male with a history of chronic smoking since childhood presents in ICU with pelvic fracture due to fall from height. On the 4th day of the ICU stay, he developed sudden tachypnoea, fall in SpO2 and hypotension. On 2D echo, there was a dilation of right ventricle and tricuspid regurgitation. What would be the next immediate step?

A. Intubate and ventilate the patient for respiratory failure
B. Start vasopressors for hypotension
C. Administer diuretics for fluid overload
D. Initiate anticoagulation therapy for suspected pulmonary embolism

**Core Concept:**

The underlying condition in this scenario is a patient with a history of chronic smoking, obesity, and a recent pelvic fracture who presents with respiratory, circulatory, and echocardiographic abnormalities. Chronic smoking can lead to pulmonary hypertension and right ventricular dysfunction, while obesity may contribute to fluid overload and cardiac dysfunction. In the context of a pelvic fracture, there is a risk of venous thrombosis and pulmonary embolism.

**Why the Correct Answer is Right:**

The correct answer to manage this patient is A (intubate and ventilate for respiratory failure) because:

* The patient's sudden onset of tachypnea, hypoxia, and hypotension indicates a severe respiratory and circulatory compromise.
* The dilated right ventricle and tricuspid regurgitation on echocardiography (option D) are signs of right heart strain, but they are not the primary cause of the patient's critical condition.
* Administering diuretics (option C) would be considered for fluid overload and congestive heart failure, not for the initial management of respiratory compromise.
* Anticoagulation therapy (option D) is necessary for suspected pulmonary embolism; however, this patient's immediate priority is respiratory support, not anticoagulation.

**Why Each Wrong Answer is Incorrect:**

A. Intubation and mechanical ventilation are essential to stabilize the patient's respiratory status and prevent further deterioration. Option A is correct because it addresses the primary cause of the patient's symptoms and signs (pulmonary insufficiency and hypoxia).

B. Vasopressors (option B) are used to treat hypotension, but they are not the first choice when managing respiratory distress. Treating respiratory failure (option A) is the priority, followed by addressing hypotension once the respiratory distress is controlled.

C. Diuretics (option C) are indicated for congestive heart failure or fluid overload, not for respiratory distress. Controlling respiratory insufficiency (option A) is the priority, and diuretics should be considered once the patient is stable.

D. Anticoagulation therapy (option D) is crucial in the context of pulmonary embolism, but this patient's initial priority is respiratory support, not pulmonary embolism investigation or treatment.