Click on image to view larger version.

Figure 1 The decision tree comparing surgical treatment strategies for hypoplastic left heart syndrome (HLHS) is shown. Once HLHS is diagnosed, a decision (open square) is made as to which treatment strategy to undertake. After the strategy is decided, events (open circles) occur, with defined probabilities for mutually exclusive outcomes, "survive" or "die." Survival to surgery or to listing for transplantation (Tx) is not certain, and a probability is associated with that survival. All babies surviving to surgery are assumed to receive that treatment as planned. The outcome measure was survival to one year.