We have previously shown that incubating cells with C3SD, which mimics the scaffolding domain of Cav‐3 and has no effect on cell capacitance (Bryant et al., 2014), decreases ICa density in intact WT control myocytes (Bryant et al., 2018a; Kong et al., 2017), and that this effect is lost following Cav‐3 KO and in TAC‐induced HF (Bryant et al., 2018a). Here, CAV3 is linked to hydrops fetalis.