models queryset and permissions

Hi people, probably I'm making a mountain out of a molehill but I
can't figure
how to solve this problem;

I've a form with a ModelMultipleChoiceField. The queryset will
contains all models for
which the user has a particular permission
(django.contrib.auth.models.Permission) (can_add).

This is the models.py

class Esame(models.Model):
name = models.CharField(max_length=80)
name_model_referenced = models.CharField(max_length=80)

class Ecg(models.Model):
esame = models.ForeignKey(Esame)
patient = models.ForeignKey(Patient, null=True)

class Ecg_da_sforzo(models.Model):
esame = models.ForeignKey(Esame)
patient = models.ForeignKey(Patient, null=True)

Supposing we have a user Tom which can add an Ecg but not an
Ecg_da_sforzo,
can I use the Django Queryset API to obtaing the correct queryset?
If yes, how can I construct it?

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