Regional cerebral blood flow changes associated with amyl nitrite inhalation

Area of Science:

• Neuroscience
• Psychopharmacology

Background:

• Volatile nitrites are used recreationally and can affect physiological and psychological states.
• Understanding the impact of amyl nitrite on cerebral blood flow (CBF) and mood is crucial.

Purpose of the Study:

• To investigate the effects of amyl nitrite inhalation on regional cerebral blood flow (CBF) in healthy volunteers with prior recreational nitrite use.
• To assess changes in mood states and somatic symptoms following amyl nitrite inhalation.
• To compare these effects against a control group.

Main Methods:

• 10 healthy volunteers with recreational volatile nitrite history inhaled amyl nitrite; a control group of 10 healthy volunteers was used.
• Regional CBF was measured using the same technique under identical laboratory conditions.
• Physiological indices (blood pressure, pulse, respiration, CO2 levels), mood states, and somatic symptoms were monitored before and after inhalation.

Main Results:

• Amyl nitrite inhalation led to significant global increases in CBF, unlike the control group.
• Pulse rate increased, but no other significant physiological changes were consistently observed.
• Subjects reported decreased anger, fatigue, and depression, but increased palpitation, breathing difficulty, dizziness, and headache.
• Changes in mood, physiological indices, and somatic symptoms did not correlate with regional CBF changes.

Conclusions:

• Amyl nitrite acutely increases global cerebral blood flow in humans.
• Subjective mood improvements and somatic symptoms following amyl nitrite use are not directly correlated with the measured changes in regional CBF.
• Further research is needed to elucidate the complex relationship between amyl nitrite, cerebral hemodynamics, and subjective experiences.