Performing Recitation for People in a Coma

Q147: Master Lu, I heard that for people who are in a coma, their souls and spirits are no longer present. For situations like this, is there still a possibility for them to recover if we perform recitations for them?

A147:
For people who are in a coma, their souls and spirits are indeed no longer present. You cannot just perform the Recalling of Souls and Spirits. You need to seek help from Buddhas and Bodhisattvas to have the souls and spirits returned to the body, and you also need to have great spiritual power from making Grand Vows. 

It is recommended that you make Grand Vows, including making a vow that you will recite a certain number of Little Houses within a certain period of time. For example, you can state that you will recite 892 Little Houses, and continue to perform recitations until the patient has fully recovered.

For the Daily Recitation, it is recommended that you include the following:
the Great Compassion Mantra(Ta Pei Chou) 49 times, 
Heart Sutra (Hsin Ching) 49 times, 
Eighty-eight Buddhas Great Repentance (Li Fo Ta Chan Hui Wen) 7 times, 
Cundi Dharani (Chun Ti Shen Chou) 49 times, 
Guna Ratna Sila Dharani (Kung Te Pao Shan Shen Chou) 49 times, and 
Mantra to Untie Karmic Knots (Chieh Chieh Chou) 49 times.

You also need to perform Life Liberation in large quantities.

There are already many cases where people have woken up from a vegetative state through their family members cultivating and performing recitations under the Guan Yin Citta Dharma Door.