Recurrent intraoperative silent ST depression responding to phenylephrine.

Area of Science:

• Cardiology
• Anesthesiology
• Cardiovascular Physiology

Background:

• Intraoperative myocardial ischemia typically results from reduced oxygen supply to the heart muscle.
• Spinal anesthesia can induce physiological changes affecting cardiovascular function.

Observation:

• An otherwise healthy male experienced recurrent, asymptomatic inferior wall ischemia episodes post-spinal block.
• These episodes were associated with tachycardia and characterized by ST depression in Lead II and reciprocal ST elevation in lead aVL.

Findings:

• The ischemia was directly correlated with episodes of tachycardia.
• Treatment with phenylephrine effectively terminated the ischemic events.
• No residual cardiac sequelae were observed after the interventions.

Implications:

• This case highlights a potential, albeit unusual, presentation of myocardial ischemia in the context of spinal anesthesia and tachycardia.
• It underscores the importance of vigilant electrocardiographic monitoring during anesthesia, even in healthy patients.
• Phenylephrine may be a valuable therapeutic option for managing such specific intraoperative ischemic episodes.