The device is a tiny sensor, implanted through a catheter in the heart's pulmonary artery.

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Chronic obstructive pulmonary disease, or COPD, is a life-threatening condition commonly caused by years of smoking.

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This is known as a pulmonary embolism.

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One other patient died of a pulmonary embolism two months after a bone-marrow transplant.

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"One of the commoner causes of sudden death is a pulmonary embolism that may occur a week to ten days later after a thrombosis formed, " Lord says.

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Hospitalized after a motorcycle accident, Keating contracted bronchitis, exacerbated by pulmonary disease and a heart ailment.

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