The design, development and documentation of software. See software engineer, systems analysis & design, programming, object-oriented programming, software metrics, CASE and Systemantics.
Overview. Posttransplant lymphoproliferative disease (PTLD) is an unusual entity that has many features of an immune system malignancy. It is characterized by uncontrolled proliferation of lymphoid lineage cells (typically B cells, rarely non-B lineage) in a context of posttransplant immunosuppression.
Percutaneous transtracheal ventilation â Percutaneous transtracheal ventilation (PTV) involves oxygenation and ventilation via a needle or surgical cricothyroidotomy using an improvised ventilation device. PTV is considered a form of conventional ventilation.