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. 2020 Jan 8;109(4):651–658. doi: 10.1111/apa.15098

Figure 7.

Figure 7

Change of restriction by the bottlenecks in the Fontan circuit: accelerated progressive ventricular dysfunction with interlocked bottlenecks (circulatory failure with poor ventricular function). Accelerated ventricular dysfunction may result in convergence of the two lines; the bottlenecks may become interlocked. Treatment of one and neglecting the other will inevitably lead to treatment failure. Once the two lines become interlocked, a vicious negative spiral ensues