Which factor does not contribute to a faster rate of inhalational induction?

A right to left intracardiac shunt actually contributes to a faster rate of inhalational induction. This is because, in a right to left shunt, blood bypasses the pulmonary circulation, which means that it does not get exposed to the inhaled anesthetic in the lungs where it typically enters the bloodstream. The anesthetic is then rapidly transported directly into the systemic circulation, resulting in quicker effects.

On the other hand, left to right shunts have a different impact. These shunts allow for mixing of oxygenated and deoxygenated blood but maintain exposure to the lung's anesthetic absorption, slowing down the process.

Low cardiac output, while generally associated with slower induction, does not apply to the question asking for which factor does not contribute to a faster rate of inhalational induction.

Additionally, a blood-gas partition coefficient of 0.5 indicates a lower affinity of the anesthetic for blood compared to gas. This lower partition coefficient typically results in faster induction since the anesthetic can more readily move from the lungs into the blood and then to the brain.

In this context, the factor that does not contribute to a faster rate of inhalational induction is indeed the right to left intracardiac shunt, because it limits