Identify the Type of Observational Study (Cross-Sectional, Retrospective, Prospective)

question 148

Essay

Identify the type of observational study (cross-sectional, retrospective, prospective).
-In a clinical trial for a new headache medication, participants are randomly assigned to a treatment group or a
placebo group. They do not know whether they are receiving the medication or a placebo. However the doctors
administering the medication and evaluating the results do know which participants are receiving the
medication. This experiment is blind but not double blind. Explain what this means and why the absence of
double blinding could cause a problem.

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Definitions:

Venae Cavae

The two large veins (superior and inferior) that return deoxygenated blood from the body to the heart.

Right Atrium

The upper right section of the heart, responsible for taking in blood lacking oxygen from the body and moving it to the right lower chamber.

Left Ventricle

The chamber of the heart that pumps oxygenated blood through the aorta to the rest of the body.

Pulmonary Trunk

A major blood vessel that carries blood from the right ventricle of the heart to the lungs for oxygenation.