**Core Concept**
Progestin-only contraceptives are often recommended for patients with cardiovascular disease due to their favorable risk profile compared to combined oral contraceptives (COCs). This is because COCs can increase the risk of thromboembolic events and worsen hypertension.

**Why the Correct Answer is Right**
Progestin-only contraceptives, such as the levonorgestrel-releasing intrauterine system (LNG-IUS) or progestin-only pills (POPs), do not contain estrogen, which is the primary contributor to the increased risk of cardiovascular events associated with COCs. The LNG-IUS is particularly effective and offers additional benefits, including reduced menstrual bleeding and improved acne. The lack of estrogen in progestin-only contraceptives makes them an ideal choice for patients with heart disease.

**Why Each Wrong Option is Incorrect**
* **Option A:** Combined oral contraceptives (COCs) are not ideal for patients with heart disease due to their increased risk of thromboembolic events and hypertension. COCs contain both estrogen and progestin, which can worsen cardiovascular conditions.
* **Option B:** Depot medroxyprogesterone acetate (DMPA) injections may be contraindicated in patients with a history of stroke or thromboembolic events. While DMPA is a progestin-only contraceptive, it can have a negative impact on lipid profiles and may increase the risk of cardiovascular events.
* **Option D:** Implants, such as etonogestrel, are progestin-only contraceptives that can be effective in patients with heart disease. However, they may be associated with changes in lipid profiles and increased risk of blood clots, making them a less ideal choice compared to the LNG-IUS.

**Clinical Pearl / High-Yield Fact**
When selecting a contraceptive for patients with cardiovascular disease, it's essential to consider the patient's overall health profile, including their risk factors for cardiovascular events and any pre-existing medical conditions.

**Correct Answer: C. LNG-IUS**