Mantras are words or phrases that are chanted out loud or internally as objects of meditation. Often these mantras are associated with particular deity/ natural forces, whose qualities can be cultivated by the repetition of the relevant mantra. Repetition of a Mantra forms the basis of Mantra Meditation.
Dr. Indu Arora offers various types of sessions on Mantra Meditation:

1. Using beads (Mala Beads)
2. With breath
3. Internal chanting
4. Various other forms of chanting

On Mantras like:

1. Om
2. Soham
3. Bija Mantra
4. Deity specific Mantras
5. Wisdom/ Peace/ Healing Mantra
6. Chakra Mantra
7. Types of Japa (Chanting)

And many more….
Using mantra meditation to reach a higher state of consciousness may help unclog arteries. African Americans with high blood pressure who practiced meditation for six months saw a .098mm decrease in fatty buildup in arterial wall, compared with an increase of .054mm among folks who simply tried to change their diet and lifestyle. Getting results takes some effort. First you need to learn to meditate, which can take hours and then you should do it for 20 minutes each morning and evening.
Time Magazine March 13,2000

PS: One would require more than one session generally to grasp the vast subject~ Mantra Meditation.