The Filipino father-of-two injected insulin into saline solutions before returning them to storage leaving unsuspecting colleagues to administer the poison.
In other cases, Chua falsified patients' charts to increase the dosage of prescribed drugs.
The 49-year-old was convicted of murdering two patients and dozens of poisonings and attempted poisonings at Manchester Crown Court on Tuesday after a three-month trial.
His victims' loved ones will be in court to see Chua sentenced to a minimum of two mandatory life sentences for the murders
In the summer of 2011, two years after Chua arrived at Stepping Hill Hospital in Stockport, patients suddenly started to suffer unexpected attacks caused by low blood sugar levels.
Two patients - Tracy Arden, 44, and Alfred Weaver, 83 - suffered agonising deaths as the insulin overdoses starved their brains of oxygen.
A third victim, Grant Misell, 41, survived, but has been told he might never recover from the serious brain damage he suffered at the nurse's hands.
Chua was cleared of murdering Arnold Lancaster, 71, but found guilty of attempting to cause him grievous bodily harm.
In all, Chua was convicted of two murders, 22 counts of attempted grievous bodily harm, one count of grievous bodily harm, seven attempts of administering poison and one count of administering poison.
In a letter found by police following his arrest, Chua had written what he described as "a bitter nurse confession".
In the 13-page document discovered in a kitchen drawer at Chua's Stockport home warned that there was "a devil" in him.
In broken English he said: "I'm writing this letter in case something happen to me my family can continue my case or can tell somebody to look at it and work out how an angel turn to an evil person."
Detective Superintendent Simon Barraclough said Chua has shown a "complete lack of remorse" for his actions.
"Chua has demonstrated clear narcissistic and psychopathic tendencies and such indiscriminate poisoning is testament to that," he said.
"He clearly had no regard for his patients and did not give a second thought as to who would be injured or the devastation this would cause them and their families."
He will be sentenced by trial judge, Mr Justice Openshaw.
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