Tissue valves are recommended for patients who: Cannot or will not take blood thinners. Are younger than 65 years old and need aortic valve replacement but do not have risk factors for blocked valves or who are younger than 70 years old and need mitral valve replacement.
UW is defined in Training Circular 18-01, Special Forces Unconventional Warfare, as activities conducted to enable a resistance movement or insurgency to coerce, disrupt, or overthrow a government or occupying power by operating through or with an underground, auxiliary, and guerrilla force in a denied area.
DEFINITION of 'Unconventional Oil' A type of petroleum that is produced or obtained through techniques other than traditional oil well extraction. Unconventional oil production is commonly seen as more costly than conventional oil production, less efficient, and is likely to cause more environmental damage. This is because unconventional oil is considered âheavierâ and requires more complex procedures to process.