The chief executive of a children’s hospital accused of putting patients at risk has resigned ahead of a Healthcare Commission report.
Birmingham Children's Hospital foundation trust said Paul O'Connor, who took the job in 2005, was leaving immediately.
The regulator launched an investigation in November after clinicians at the hospital and neighbouring trusts reported problems in several specialties.
Chair Joanna Davis said in a statement: "The trust can confirm that Paul O'Connor, chief executive, has tendered his resignation with immediate effect. He has not been removed from his position."
Health secretary Alan Johnson asked the Healthcare Commission to investigate after a report by the trust's commissioners raised concerns about a perception of "poor and disorganised management processes and lack of confidence in managers at all levels".
The report, commissioned by primary care trusts, said: "Serious untoward incidents are reported through their main commissioner; however, internal reporting of incidents relating to delay in service delivery or clinical incidents are not reported by the service leads and therefore not reported through the governance framework for consideration at board level."
There was concern about services including renal transplant, liver transplant and neuroscience.
Mr O'Connor follows Mid Staffordshire foundation trust chief executive Martin Yeates as the second West Midlands NHS chief executive to resign in a week.
West Midlands strategic health authority has also been without a permanent chief executive since August last year.