The American Medical Association's House of Delegates has voted to undertake a study of the repatriation of uninsured immigrant patients by hospitals. The doctors' group was prompted to address the matter by the California Medical Association, which voted in October to oppose the forced repatriation of patients. But the AMA delegates, while expressing concerns about repatriations and what they called the "inappropriate discharge of patients," declined to take a stand before examining in detail the legal, financial and medical issues involved.