7 Recognizing Hemodynamic Deterioration

Recognize deterioration early

Hemodynamic deterioration is a worsening in the circulation’s ability to deliver oxygenated blood to tissues. It can begin before blood pressure becomes markedly abnormal, so a near-baseline pressure does not rule it out. Look for patterns and changes from the patient’s baseline rather than relying on isolated measurements.

A warning score can support assessment, but clinical concern should override a reassuring score. If the patient looks acutely unwell, assess and escalate promptly.

Understand cardiac output

Cardiac output is the volume of blood pumped per minute. It depends on heart rate and stroke volume:

Stroke volume is affected by Preload, Afterload, and Contractility. Preload is ventricular filling; afterload is the resistance the ventricle must pump against; contractility is the heart’s ability to contract. Blood pressure reflects cardiac output and vascular tone, so pressure alone does not fully describe tissue perfusion.

A change in one or more of these factors may help explain a concerning pattern, but findings alone do not establish the cause.

Look for patterns across the patient

Assess findings across several domains and consider their trend over repeated checks. These findings can suggest reduced cardiac output or impaired tissue perfusion, but they are not specific to one cause. Interpret them with the patient’s history, examination, and other measurements.

• Circulation: Falling blood pressure, narrowing pulse pressure, rising heart rate, weak pulses, cool or mottled skin, delayed capillary refill, or new chest discomfort.

• Brain and kidneys: New confusion, reduced alertness, dizziness, or declining urine output.

• Breathing and oxygenation: Increasing respiratory rate, falling oxygen saturation, or a new or increasing oxygen requirement.

• Trend and support: Worsening values on repeated checks, rising lactate, or increasing support needed to maintain blood pressure or oxygenation.

In suspected sepsis, ongoing reassessment and dynamic measures are emphasized alongside clinical findings, rather than relying on static measurements alone. Examples include assessing the stroke-volume response to a passive leg raise or a fluid challenge.

Interpret concerning clinical patterns

A change from a blood pressure of $124$ systolic and $76$ diastolic to $101$ systolic and $68$ diastolic over two hours, alongside a heart rate rising from $84$ to $112$ beats per minute, increasing respiratory rate, and new restlessness, is concerning for deterioration and possible falling effective cardiac output or impaired perfusion. The systolic pressure need not be extremely low for the combined trend to matter. A rising heart rate and altered mentation accompanying a falling pressure may be early warning signs.

Promptly reassess the patient, verify measurements while assessing the patient’s condition, and escalate according to the local response pathway. Do not wait for a dramatic pressure drop or rely on a single blood-pressure value or score in place of clinical assessment.

After several episodes of vomiting, a faster pulse, low blood pressure on repeat measurement, cool extremities, and reduced urine output may be connected by reduced circulating volume. Reduced volume can lower venous return and ventricular filling (preload), which may reduce stroke volume and cardiac output. This pattern warrants prompt reassessment and escalation, but the cause cannot be confirmed from these findings alone.

In a patient with known cardiac disease, worsening breathlessness, cool skin, weak peripheral pulses, and declining blood pressure may reflect reduced cardiac output, for example from impaired contractility or increased workload or afterload. The pattern does not identify the cause. Reassess urgently, review trends and available monitoring, and escalate. Do not assume fluid is appropriate solely because pressure is low; treatment depends on the clinical assessment and cause.

Reconcile measurements with the patient

If an arterial-line display suddenly shows a pressure drop while the patient is awake, warm, and speaking normally, assess the patient immediately and check the measurement for possible error. This includes checking the transducer setup and waveform, and obtaining a confirmatory measurement if appropriate. Continue to take the reading seriously until the discrepancy is resolved.

If the patient shows signs of instability, escalate immediately rather than delaying for troubleshooting. Hemodynamic measurements are useful only when interpreted alongside the bedside assessment and the quality of the measurement.

Escalate and communicate clearly

A blood pressure near baseline is not reassuring when the patient is newly confused, breathing faster, needing more oxygen, and has mottled skin. This cluster suggests possible deterioration and inadequate tissue perfusion or oxygen delivery despite the pressure. Reassess promptly and escalate based on the clinical picture and local criteria; worsening oxygen needs and new mental-status changes are important warning signs.

When a patient is difficult to rouse, hypotensive, and rapidly worsening in oxygenation, call for urgent help using the local emergency or rapid-response pathway. At the same time, begin an immediate bedside assessment and support within your role. Do not wait for the next scheduled observation or for every measurement to be completed. Reassess and communicate the trend, key findings, and response to immediate actions.

Use SBAR to organize escalation: state the Situation, relevant Background, your Assessment, and a clear Recommendation or request. Include the time course, important trends, current support, and the response needed.