Nursing care
New headache during stroke thrombolysis: stop the infusion first
Written and reviewed by Dana Whitfield, RN, MSN · 4 min read · Updated October 2026
Short answer
Stop the alteplase infusion, then notify the stroke team or provider immediately. New severe headache, vomiting, rising blood pressure or worsening neurological status during thrombolysis may signal intracranial haemorrhage. Assess neurological status and vital signs, protect the airway, and prepare for emergency imaging and the blood tests and reversal steps in the protocol.
First action: stop the infusion
Alteplase dissolves clot by activating the body's fibrinolytic system, and its most serious adverse effect is bleeding, including bleeding inside the skull. Stroke guidance advises stopping the infusion as soon as intracranial haemorrhage is suspected, and new severe headache, vomiting or neurological decline are typical warning signs. The drug label likewise directs that the infusion be terminated if serious bleeding occurs.
Stopping first matters because every minute of continued infusion adds more thrombolytic effect to a possible bleed. The nurse does not need to wait for a provider to call back before clamping the line when the protocol supports it. Slowing the rate, giving an analgesic and reassessing in fifteen minutes are all distractors that keep the drug running.
The escalation sequence after stopping
Next, notify the stroke team or provider immediately and report the change clearly: time of onset, symptoms, neurological findings and vital signs. Repeat the neurological assessment the unit uses, compare it with the pre-treatment baseline, and check pupils and level of consciousness. Prepare the client for emergency imaging so the team can see whether bleeding is present.
While the team decides on next steps, collect the blood tests specified in the protocol and have reversal or blood product orders ready to act on if the provider prescribes them. Blood pressure targets are tight after thrombolysis, commonly kept below about 180/105 for the first 24 hours, so a sudden rise is part of the picture and is reported, not left for the next scheduled check.
Airway, safety and what can wait
Vomiting and falling consciousness threaten the airway. Raise the head of the bed if permitted or turn the client to the side, keep suction ready, and keep the client nil by mouth. Avoid intramuscular injections and unnecessary punctures, which the label cautions against during thrombolytic therapy. Watch puncture sites, gums and urine for other bleeding.
Routine documentation, family updates and comfort measures follow the stop-and-escalate steps. Another nurse can call the team or fetch suction while the primary nurse stays at the bedside. Assessment and interpretation are not delegated to an assistant. Keep in mind a different infusion reaction: tongue or lip swelling suggests angioedema, which the label notes can occur during and after the infusion.
Baseline and monitoring that make early recognition possible
Spotting a bleed early depends on monitoring set up before the problem appears. Thrombolysis protocols call for frequent neurological checks and blood pressure measurements during and after the infusion, compared each time with the pre-treatment baseline. A nurse who knows the starting score can recognise a small decline, such as new drowsiness or a weaker grip, rather than waiting for a dramatic change.
Teach the client and family before the infusion to report headache, nausea, new weakness or difficulty speaking immediately. Keep the call bell within reach and check that the client can use it. Record every assessment with the time, so the team can see the trend and the exact moment a change began if an emergency occurs.
A hypothetical scenario with tempting options
Imagine a hypothetical client 40 minutes into an alteplase infusion for ischaemic stroke who suddenly reports the worst headache of her life, vomits, and has a newly drowsy response. The options are giving prescribed acetaminophen and continuing, slowing the infusion, stopping the infusion and notifying the stroke team, or rechecking vital signs in fifteen minutes.
Stopping the infusion and notifying the team is first because the new headache, vomiting and decline in consciousness suggest intracranial haemorrhage, and the drug may be worsening it. Acetaminophen treats a symptom while ignoring the cause. Slowing the rate still delivers drug. A delayed recheck wastes time when imaging and possible reversal depend on rapid recognition.
Sources and further reading
DailyMed: Activase (alteplase) prescribing information. Bleeding as the main risk, terminating the infusion for serious bleeding, avoiding IM injections, angioedema monitoring.
MSD Manual Professional: Ischemic stroke. Blood pressure limits before treatment and for at least 24 hours after thrombolysis.
Acute Ischemic Stroke: Management Approach. Stopping the alteplase infusion when intracranial haemorrhage is suspected, urgent blood tests and emergency head CT, serial neurological examinations and strict blood pressure control.
The next step on this is the same as on everything else here: answer questions and read the rationales. Our neurological practice questions are the closest set to what this page covers.
Common questions
Can the nurse stop alteplase before the provider arrives?
Yes, where protocol supports it. Stroke guidance advises stopping the infusion when intracranial haemorrhage is suspected, such as new severe headache or neurological decline, then notifying the team immediately.
What signs during thrombolysis suggest bleeding in the brain?
New severe headache, nausea or vomiting, a sudden rise in blood pressure, reduced consciousness, or worsening weakness or speech compared with the baseline.
Is tongue swelling during alteplase the same emergency?
No. It suggests angioedema, a hypersensitivity reaction noted in the label. It still needs urgent reporting and airway assessment, but the cause differs.