Coronary Flow and Regional Function before and after Supraarterial Myotomy for Myocardial Bridging

Ronald C. Hill*, W. Randolph Chitwood, Thomas M. Bashore, James D. Sink, James Lewis Cox, Andrew S. Wechsler

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

70 Scopus citations


Myocardial bridges have been associated with clinical and metabolic evidence of ischemia, although the mechanism for this is unclear. We measured coronary blood flow and segmental function at different heart rates prior to and after release of a myocardial bridge involving the left anterior descending coronary artery in a patient with angina. Before lysis of the bridge, atrial pacing was associated with a decreased systolic flow/total flow, increased duration of systole, a lag in diastolic flow, and functional deterioration. After release of the bridge, pacing was associated with increased systolic flow/total flow and systolic interval, no diastolic flow lag, and no functional deterioration. These data imply that before bridge division, systolic flow and the initiation of diastolic flow were impeded. Functional abnormalities resulting from the flow discrepancies at heart rates of 120 to 150 beats per minute may have accounted for this patient's symptoms.

Original languageEnglish (US)
Pages (from-to)176-181
Number of pages6
JournalAnnals of Thoracic Surgery
Issue number2
StatePublished - 1981

ASJC Scopus subject areas

  • Surgery
  • Pulmonary and Respiratory Medicine
  • Cardiology and Cardiovascular Medicine


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