Final answer:
D. 80 mmhg A strong radial pulse indicates that the unconscious male's systolic blood pressure is at least 80 mm Hg.
Step-by-step explanation:
When you find a 30-year-old unconscious male with a strong radial pulse, his approximate systolic blood pressure would be at least 80 mm Hg (answer D). The presence of a palpable radial pulse generally indicates that the systolic blood pressure is not less than 80 mm Hg since the radial artery is perfused with blood adequately to be felt as a pulse. Without a strong pulse, the pressure could be lower, indicating an emergency situation requiring immediate medical intervention.
The approximate systolic blood pressure of the unconscious male can be estimated to be 80 mmHg based on the information provided. According to the reference, the typical blood pressure of a young adult raises the mercury to a height of 120 mm at systolic and 80 mm at diastolic. The radial pulse being palpable indicates a blood pressure of at least 60 mmHg or higher. Since the options given range from 40 mmHg to 80 mmHg, the closest value to the estimated systolic blood pressure would be 80 mmHg (option D).