Declension table of hṛdayasūtra

Neuter	Singular	Dual	Plural
Nominative	hṛdayasūtram	hṛdayasūtre	hṛdayasūtrāṇi
Vocative	hṛdayasūtra	hṛdayasūtre	hṛdayasūtrāṇi
Accusative	hṛdayasūtram	hṛdayasūtre	hṛdayasūtrāṇi
Instrumental	hṛdayasūtreṇa	hṛdayasūtrābhyām	hṛdayasūtraiḥ
Dative	hṛdayasūtrāya	hṛdayasūtrābhyām	hṛdayasūtrebhyaḥ
Ablative	hṛdayasūtrāt	hṛdayasūtrābhyām	hṛdayasūtrebhyaḥ
Genitive	hṛdayasūtrasya	hṛdayasūtrayoḥ	hṛdayasūtrāṇām
Locative	hṛdayasūtre	hṛdayasūtrayoḥ	hṛdayasūtreṣu

Compound hṛdayasūtra -

Adverb -hṛdayasūtram -hṛdayasūtrāt