**Core Concept**
The triptans are a class of selective serotonin 5-HT1B/1D receptor agonists used in the treatment of acute migraine attacks. Their mechanism of action involves activation of these receptors, leading to vasoconstriction of the intracranial blood vessels and inhibition of pro-inflammatory neuropeptide release.

**Why the Correct Answer is Right**
The use of triptans is contraindicated in patients with **hemiplegic or basilar migraine**, as these conditions are associated with a higher risk of stroke and cerebral vasospasm. This is because the vasoconstrictive effects of triptans may exacerbate these conditions, potentially leading to more severe ischemic events. Additionally, patients with a history of **migraine with aura** and those who are **sensitive to ergotamines** should also exercise caution when using triptans, although these are not absolute contraindications.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it does not accurately represent a contraindication for triptans. While certain cardiovascular conditions may require caution when using triptans, this is not a universal contraindication.
**Option B:** This option is incorrect as it is not a recognized contraindication for triptans. In fact, some patients with a history of ischemic heart disease may still be candidates for triptan therapy, although this should be carefully evaluated on a case-by-case basis.
**Option C:** This option is incorrect as it is not a contraindication for triptans. In fact, many patients with hypertension can safely use triptans, although caution should be exercised in patients with uncontrolled hypertension.

**Clinical Pearl / High-Yield Fact**
When prescribing triptans, it is essential to carefully evaluate the patient's medical history, including any history of cardiovascular disease, to minimize the risk of adverse events.

**Correct Answer: A. Hemiplegic or basilar migraine**