| 1 | In most cases, it's probably ventricular fibrillation that causes these sudden deaths from fear. | |
| 2 | They had a 3.5-fold improvement in the amount of blood in their heart, plus a larger capacity in their left ventricles. | |
| 3 | This is connected via a sealing valve to the larger, more powerful lower chamber, or ventricle. | |
| 4 | That device is the ventricular-peritoneal shunt, a tube that drains excess cerebrospinal fluid into the peritoneal cavity. | |
| 5 | It may also cause the walls of your left ventricle to become stiff and thick, which can change how electrical impulses travel through your heart. |