Medical Oncologist
CION Cancer Clinics
Monitors, alarms and what they are telling the nurse | CION Cancer Clinics
Most ICU alarms do not mean an emergency. They sound because a sticker has slipped, the patient has moved or a drip is running out, and nurses can tell from the sound and the screen which ones need action. This page explains the numbers on the monitor, why alarms keep going off, and what you should and should not do when one sounds. CION Cancer Clinics’ surgical oncologists in Hyderabad can talk this through with you.
MM
Medically reviewed by Dr. Muralidhar MuddusettyConsultant Surgical Oncologist · MBBS (AIIMS), MS (Surgery, AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh) · last reviewed September 2026, next review due September 2027
17+specialists on panel
15,000+patients treated
35+centres across Telangana & AP
4.8★ / 800+Google rating
On this page
- Does an ICU alarm mean something is wrong?
- What do the numbers on the ICU screen mean?
- Why do the alarms keep going off?
- What should you do when an alarm sounds during a visit?
- Which other machines might be beeping?
- Why do the numbers keep changing?
- What do families wrongly assume about monitors?
- Common questions about ICU monitors and alarms
The short answer
Does an ICU alarm mean something is wrong?
Most ICU alarms do not mean an emergency. They go off because a sticker has slipped, the patient has moved or coughed, or a drip is about to run out, and the nurse can tell from the sound and the screen which alarms need action straight away.
Why there are so many alarms
Each machine is set to warn the moment a reading moves outside the limits the team has chosen. Those limits are set tight on purpose, so that a real change is never missed. The price of that safety is a lot of noise. Staff learn to hear the difference between a pump finishing and a heart rhythm that needs attention.
Who is watching
In most ICUs the readings from every bed also appear on a central screen at the nurses' station. So even when no nurse is standing at the bed, someone can often see what the monitor shows. A nurse walking calmly to the bed, or finishing a task first, usually means the alarm is not urgent.
What this page cannot tell you
It cannot tell you whether a particular number is safe for your family member. Normal readings differ from person to person, and the team sets alarm limits for each patient. Ask the bedside nurse what they are watching most closely today.
On the monitor
What do the numbers on the ICU screen mean?
- HR
- Heart rate, the number of heartbeats a minute. The moving line beside it, the ECG, shows the heart's electrical rhythm.
- BP or NIBP
- Blood pressure measured by the arm cuff, which squeezes every so often. ABP or ART means it is measured all the time through a thin tube in an artery, usually at the wrist.
- SpO2
- The oxygen level in the blood, read by the clip on a finger or ear. Cold hands or nail polish can make it read wrongly.
- RR
- Respiratory rate, how many breaths a minute.
- Temp
- Body temperature, from a probe or a regular check.
- CVP
- A pressure reading from a line in a large vein in the neck, which helps the team judge fluids.
Not sure whether this applies to you?
Ask an oncologistBehind the beep
Why do the alarms keep going off?
Most alarms fall into one of these groups. Only the last is usually urgent.
A sensor has slipped
A finger clip falls off, a chest sticker loosens with sweat, or the blood pressure cuff is bent. The screen shows a flat or jumpy line that is not real.
The patient moved
Coughing, turning, shivering, talking or being washed all change the readings for a moment. The alarm usually stops as they settle.
A drip or pump needs attention
Pumps beep when a syringe is nearly empty, a line is kinked, or there is air in the tube.
Often heard as
- A repeating short beep
- A message on the pump screen
A real change in the body
A drop in oxygen, a fast or irregular heartbeat, or falling blood pressure. Many monitors use a louder or different tone for these, and staff respond at once.
At the bedside
What should you do when an alarm sounds during a visit?
Do not touch the machine
Never press a button to silence an alarm, and never move a line or sticker yourself. Doing so can hide a real problem.
Look at your family member
Are they moving, coughing or pulling at something? Tell the nurse what you saw. It helps them decide quickly.
Check that staff know
If an alarm keeps sounding and no nurse comes, and your family member looks distressed, breathless or unusually pale, call a nurse over.
Step back if asked
If several staff arrive at once, move away from the bed so they have room. Someone will come and explain as soon as they can.
Leave a number, we will call you
One field. No form to fill in, and no charge for the call.
Other sounds
Which other machines might be beeping?
- The ventilator, when the person coughs or phlegm builds up in the tube
- Drip pumps and syringe drivers giving medicines
- A pain relief pump the patient presses themselves
- A pressure-relieving air mattress
- Leg sleeves that inflate to help prevent clots
- A feeding pump for liquid food through a tube
Reading the trend
Why do the numbers keep changing?
Readings rise and fall all day, even in someone who is recovering well. The team cares far more about the direction over hours than about a single number on the screen.
Everyday reasons for a change
Pain, fever, fear, coughing, sleep and a full bladder can all push the heart rate and blood pressure up or down. Oxygen may dip briefly when someone rolls over or during suction. The team looks at the pattern alongside blood tests, urine output and how the patient looks.
Why staring at the screen can hurt you
Many families spend the whole visit watching the monitor and leave more frightened. Your family member gains more from your face and your voice. Sit where you can hold a hand, and let the nurse watch the numbers.
Asking about the numbers
It is fair to ask which reading the team is most focused on and whether it is moving in the right direction. Ask at the daily update, not every time a number changes.
When the numbers do matter to you
Trust what you see in your family member as much as the screen. If they look newly breathless, grey, sweaty, very drowsy or suddenly confused, tell the nurse even if the monitor is quiet. You know how they normally look, and that knowledge helps the team.
Commonly believed
What do families wrongly assume about monitors?
"If the nurse does not run to the bed, she is ignoring the alarm."
Nurses tell alarms apart by sound and often see the reading on the central screen. Walking calmly usually means they have judged it safe. Urgent alarms get an immediate response.
"A red number means he is getting worse."
Colours often show which reading an alarm is about, or that a sensor has lost contact. A single red number can be a slipped clip. The trend and the nurse's check matter more.
"We can switch off the beeping so she can sleep."
Only staff should silence or change alarms. Ask whether the volume can be lowered at night or whether readings can be taken less often as she improves.
"Fewer wires means the team has given up."
Usually the opposite. Monitors and lines are removed as a person becomes steadier and needs less watching.
Questions we are asked
Common questions about ICU monitors and alarms
What is a normal oxygen level on the monitor?
It depends on the person. Someone with long-term lung disease may be safe at a lower reading than someone with healthy lungs, and the team sets the target for each patient. Ask the nurse what the target is for your family member, rather than comparing with a number you read online.
Why does the blood pressure cuff keep squeezing his arm?
The cuff is set to measure blood pressure automatically at regular times, more often when readings need close watching. It can feel tight for a moment. If it is leaving marks or causing pain, tell the nurse, who can move it to the other arm.
The alarm went off and nobody came. Should I worry?
Often the nurse has already seen the reading on the central screen and judged it safe. If the alarm continues and your family member looks unwell, breathless or very drowsy, go and tell a nurse. You will never be wrong to ask.
Why is the heart rate so fast after surgery?
Pain, fever, anxiety, blood loss, dehydration and some medicines can all make the heart beat faster after an operation. It is one of the readings the team watches and treats by finding the cause. Ask the nurse whether it is expected and what they are doing about it.
Can the monitor give her an electric shock?
No. The stickers and clips only read signals from the body. They do not send electricity in. It is safe to touch your family member and hold her hand while she is connected, as long as you do not pull on the wires.
Why does the ventilator alarm when he coughs?
Coughing pushes against the air the machine is giving, so the pressure rises for a moment and the alarm sounds. It may also mean phlegm needs clearing from the tube. The nurse will check and use suction if needed.
How will we know when monitoring is reduced?
As your family member improves, wires and lines come off, readings are taken less often, and they move to the HDU or a ward. Each step is a sign of progress. The nurse will usually tell you what has been removed and why.
The noise stops her sleeping. Can anything help?
Ask whether alarm volumes can be lowered at night, whether lights can be dimmed and whether checks can be grouped together. Earplugs or an eye mask may be allowed. Good sleep also helps prevent confusion, so it is a reasonable request to make.
Meet the Specialists
17+ senior cancer specialists. One panel for your case.
Trained at AIIMS, Tata Memorial, and leading international centres. Combined 150+ years of experience. Every complex case is reviewed by 3+ of them — together.
Medical Oncologist
Dr. C. Raghavendra Reddy
MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
Medical Oncologist
Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
Medical Oncologist
Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
Medical Oncologist
Medical Oncologist
Surgical Oncologist
Dr. Muralidhar Muddusetty
MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
Surgical Oncologist
Surgical Oncologist
Surgical Oncologist
Dr. Vinay Mamidala
MBBS, MS(General Surgery), M.Ch(Surgical Oncology), FMAS, FARIS(Ongoing)
Surgical Oncologist
Radiation Oncologist
Radiation Oncologist
Radiation Oncologist
Hematologist
Surgical Oncologist
Dr. Vajja Sandeep Kumar
MBBS, MS (General Surgery), DrNB (Surgical Oncology), FALS Oncology
Surgical Oncologist
Want a specific doctor for your case? Mention them when booking.
Book Free ConsultationBook an appointment with our specialist
Share your name and number — we'll call you back within 30 minutes to schedule your consultation.
Sources
- NHS — Intensive care
- Cancer Research UK — Surgery for cancer
- Macmillan Cancer Support — Surgery
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
Keep reading
Related pages
What ICU Looks Like: A Family GuideThe rest of the equipment and people around the bedBeing on a Ventilator After SurgeryWhy the breathing machine alarms and how people come off itDrains, Tubes, Lines and CathetersWhat each line into the body is forComplications and Red FlagsThe changes after surgery that do need urgent attention
Talk to us
Not sure what to do next?
Tell us what has been found so far and we will help you reach the right specialist. One helpline serves every CION centre.