Why do the spikes in the electrocardiogram, such as the qrs complex, come shortly before a contraction?

what would it mean if the spikes were irregular?

Adouble-blinded trial for a new indication is conducted under an ind comparing two (2) marketed drugs, at twice the approved prescribed doses. on day 2, subject 603 had difficulty breathing. although it was life-threatening initially, subject 603 was treated and discharged directly from the emergency department after complete recovery. on day 5, subject 20 had a headache, which led to hospitalization and required blood pressure lowering medications. these episodes cannot be explained on the basis of the pharmacological property of either drug or the subjects' medical histories. the investigator would submit an sae report for: a. neither of the subjects b. subject 603 only c. subject 20 only d. both of the subjects

So i have a lot of answers answered but it says i still need to answer more questions. why is it doing that? how many questions need to be answered?

If gonorrhea is a treatable infection why do so many men experience severe damage and even in infertility or joint infections as a result of leaving it untreated