Table 2.

The characteristics of the patients prescribed methadone comparing those with a normal QT vs. those with an abnormal QT

Characteristics	Normal	%	Abnormal QT	%
Number	12		7
Male	4	33%	4	57%
Age (years; range)	36 (20–52)		35 (25–56)
Opioid agonist treatment
Dose (mg)	115 (70–160)		100 (75–170)
Urine Drug Screen
Cocaine	1	8%	0	0%
Methamphetamines	1	8%	1	14%
Benzodiazepines	2	17%	5	71%
THC	7	58%	3	43%
Electrolytes
Magnesium (mmol l –1 )	0.81 (0.76–0.92)		0.83 (0.66–0.89)
Calcium (mmol l –1 )	2.33 (2.25–2.56)		2.44 (2.23–2.50)
Potassium (mmol l –1 )	4.3 (3.8–5.0)		4.5 (4.1–4.8)