Assuming ventricular shunts in the brain, proper placement is important to minimize chance of blockage.
But there is no way to predict or prevent actual malfunction. Patients with shunts should be followed up regularly and discuss any symptoms of headaches, nausea
, or vision problems
immediately with their doctor. Surgical correction may be needed. (other shunts exist: e.g. Av dialysis
Answer assisted by Jin Packard, Medical Student