Following a 12-day trial, a Philadelphia jury has deadlocked in a case brought by a man who claimed emergency room staff at the Hospital of the University of Pennsylvania failed to diagnostically analyze the cause of numbness and tingling in his legs — allegedly the first symptoms of a condition that ultimately rendered the lower half of his body paralyzed.

The 12-member jury’s inability to reach a verdict in Tisdale v. Trustees of the University of Pennsylvania after nearly three days’ deliberations has caused to go into effect a multimillion-dollar high-low agreement reached over the course of the trial by the parties’ attorneys with the supervision of Judge Victor J. DiNubile Jr., who presided at trial, according to sources familiar with the case.