Based on my prior knowledge, paroxysms of ventricular tachycardia at the time of admission to the intensive care unit (GT_POST) can sometimes be associated with chronic heart failure.

To analyze the relationship between GT_POST and chronic heart failure, we can examine the GT_POST values for patients with and without chronic heart failure.

Here is the analysis:

- For patients without chronic heart failure (target class "no"):
    - GT_POST values: "no"
- For patients with chronic heart failure (target class "yes"):
    - GT_POST values: "no", "yes"

Based on this analysis, the relationship between GT_POST and chronic heart failure can be summarized as follows:

```json
{
   "no": ["no"],
   "yes": ["no", "yes"]
}
```
This means that for patients without chronic heart failure, the GT_POST value is always "no". However, for patients with chronic heart failure, the GT_POST value can be either "no" or "yes".

Please note that the possible values of GT_POST for patients with chronic heart failure are not provided, as it is hard to predict all possible values without further information.