4 Ice Baths and Monkey Lungs

^fn1 This is a common and usually harmless occurrence, and the reason that people sometimes refer to their heart ‘skipping a beat’.

^fn2 As we saw in Chapter 2, ventricular septal defect (VSD) is one of the four anomalies found in tetralogy of Fallot.

^fn3 A film of this astonishing spectacle was made in 1940 and released in the West as Experiments in the Revival of Organisms, introduced by the great biologist J. B. S. Haldane. You can watch it at https://archive.org/details/Experime1940 – though some doubt has been cast on its authenticity.