Based on prior knowledge, paroxysms of ventricular tachycardia at the time of admission to the intensive care unit (GT_POST) can be related to chronic heart failure. Ventricular tachycardia is a rapid heartbeat that originates in the ventricles of the heart, which can be a symptom of heart failure.

To analyze the relationship between GT_POST and the presence of chronic heart failure, we need to examine the data and see if there is any correlation between the two.

Once we have analyzed the data, we can create a dictionary that contains the possible values of GT_POST for each target class.

```json
{
	"no": ["no", "yes"],
	"yes": ["no"]
}
```

Here, the target class "no" indicates the absence of chronic heart failure, and the target class "yes" indicates the presence of chronic heart failure. 

The dictionary shows that for the target class "no," the possible values of GT_POST are both "no" and "yes," suggesting that some patients without chronic heart failure experience paroxysms of ventricular tachycardia at the time of admission to the intensive care unit. 

For the target class "yes," the only possible value of GT_POST is "no," indicating that no patients with chronic heart failure experience paroxysms of ventricular tachycardia at the time of admission to the intensive care unit.

Note that we do not have enough information to determine the relationship between GT_POST and chronic heart failure for the GT_POST value "no" in the "no" target class. As per the task requirements, we do not include this value in the dictionary, as its relationship with chronic heart failure is uncertain.