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Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
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In hyperventilation:
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The correct answer is  Hyperventilation washes out CO2 from body, leadng to alkalosis.So, Oxygen hemoglobin dissociation  curve will  shift  to  left  (high  affinity), decreasing P50 of hemoglobin.
Reference: Ganong’s Review of Medical Physiology 24th edition pg 611