**Core Concept**
The cardiopulmonary manifestations of hyperthyroidism are primarily due to the increased metabolic rate and cardiac output caused by excess thyroid hormones. This leads to symptoms such as palpitations, shortness of breath, and fatigue.

**Why the Correct Answer is Right**
The increased metabolic rate in hyperthyroidism leads to an increased demand for oxygen by the tissues, resulting in **tachypnea** and **tachycardia**. The increased cardiac output also causes **hypertension** due to the increased workload on the heart. Additionally, the increased metabolic rate can lead to **atrial fibrillation**, which is a common arrhythmia seen in hyperthyroidism.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not directly related to the cardiopulmonary manifestations of hyperthyroidism.
**Option B:** While weight loss is a common symptom of hyperthyroidism, it is not a cardiopulmonary manifestation.
**Option C:** This option is incorrect as it is not a direct consequence of increased thyroid hormone levels.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the cardiopulmonary manifestations of hyperthyroidism can mimic those of cardiac disease, making it crucial to consider thyroid function tests in patients with unexplained cardiac symptoms.

**Correct Answer: A.**