| 1 | This is called intractable or severe angina, the severity of which is designated by classes. | |
| 2 | Researchers believe the loss of these blood vessels contributes to the pain of chronic, severe angina. | |
| 3 | The therapy, carried out by Chicago's Northwestern University, halved the number of bouts of angina chest pain. | |
| 4 | Patients with severe angina had stem cells from their blood injected into their heart. | |
| 5 | Viagra can be fatal if used in combination with nitrates, the drugs prescribed to treat heart problems such as angina. |
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