Circulatory assessment

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Circulatory assessment

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Circulatory assessment overview


Circulatory assessment forms part of a complete assessment of the patient and many other aspects of the infant’s or child’s condition will dictate parts of the cardiovascular assessment. Therefore, no information should be viewed in isolation. Given that abnormalities in fluid status can lead to deterioration, having a good understanding of the circulatory status of a patient is very important, also understanding why these changes may be significant. It is important to attempt an assessment when the child or infant is as calm as possible. Plan your approach in advance, as agitation and anxiety can lead to abnormal findings. If possible, attempt the assessment with the child sitting on the parent’s or carer’s lap or as close to them as possible to minimize stress in the child or infant. Much of the assessment can be gained by calmly observing the infant without a full examination, for example, consider the facial features (dysmorphic features?), also the rate and work of breathing. Use distraction, simple efforts to keep a child or infant calm will help in assessing them more accurately. Calculating cardiac output does not form part of a basic assessment but having an understanding of how the amount of blood each minute affects the body, via an assessment, gives a good understanding of the patient’s cardiovascular function.


Cardiac output


The heart’s action as a pump is to create ‘cardiac output’ or the amount of blood (stroke volume) pumped out of the heart in one minute. This is assessed via a cardiovascular assessment, considering perfusion, heart rate, blood pressure, pulse volume and the patient’s temperature. The relevance, even to a basic assessment, is that all cellular function is primarily reliant on oxygen, which is carried via blood pumped by the heart, therefore if the heart is not pumping as well as it should, perfusion will be diminished and organ function will deteriorate accordingly. This manifests in a number of ways, three examples to be aware of are: (1) reduced urine output, indicating global dehydration or reduced renal perfusion; (2) increased (in particular) respiratory rate or effort may indicate fluid retention within the lungs, indicating cardiac failure, or may be due to a respiratory cause or due to anxiety; and (3) agitation may be because the patient is scared or due to reduced cerebral perfusion. Be mindful of the whole fluid status of the patient when making an assessment.


Factors that determine cardiac output include the cardiac function (how well the heart is working), the heart rate (HR) (the heart rate is useful for cardiac function up to a point – if a patient becomes too tachycardic, this function will fail), the amount of blood entering the ventricle (pre-load) and the amount leaving the ventricle (afterload). This is calculated using the formula:


Cardiac output stroke volume (litres/beat) × heart rate


Inspection


Using good timing, i.e. not when the patient is hungry or has just undergone a procedure, use patience and distraction if possible, take time to assess the whole child. Consider their general appearance: do they appear in good health? Are there any obvious dysmorphic features? Are there any scars or signs of previous surgery? Is there cyanosis or low Sa02? Are they mottled? Are they sweaty? Do they appear to using an increased effort to breathe? Also how do they interact with their parent or carer? It is always important to bear in mind other parts of a child’s or infant’s life, for example, their social situation. Be mindful this quiet inspection may also present safeguarding concerns.


Palpation


After seeking permission to physically examine the patient, palpate pulses in the following areas: first, check radial, brachial and femoral, then attempt palmer, axillary, carotid (older children), popliteal, posterior tibialis and dorsalis pedis. This is also useful when considering sites for taking blood pressure measurements. Are pulses present? Are they even? Consider the rate, rhythm, volume and any other notable findings, for example, thrill. The apex beat is usually found in the 4th to 5th intercostal space in the mid-clavicular line. If it is not found in this position, this may be significant and requires reporting, as it may indicate a cardiac abnormality. Is the heart rate within normal limits? Attempt to palpate the liver, just below the diaphragm, usually on the right in the mid-clavicular line – this should not be palpable, a palpable liver may indicate fluid overload and needs reporting.


Auscultation


Using a stethoscope, warm the diaphragm of the bell (round disk) and auscultate the four main areas: aortic, pulmonary, tricuspid and mitral/apex, listening for heart sounds, added sounds and murmurs. Added sounds and murmurs are difficult, however, to discern, so concentrate primarily on heart sounds. First sound (S1): closing of the mitral and tricuspid valves. Second sound (S2): closure of the aortic and pulmonary valves.


Fluid balance


This should be calculated at a minimum hourly in the sicker patient, less frequently in the more stable patient. The importance of this inspection, indicating cardiac, respiratory and renal function should not be underestimated. Ensure the fluid total is taken into account in this assessment as any significant discrepancies may account for abnormalities found and will indicate a possible solution. If this is part of an initial assessment, take time to discuss the number of wet nappies an infant has had in the past 24 hours, most parents or carers will know this and it is a strong indicator regarding fluid status. At this time consider the condition of the skin and mucous membranes; decreased skin turgor is indicated when skin is gently pulled upwards and it remains in place for a few seconds – this is a significant sign of dehydration as are dry mucous membranes (mouth, eyelids), also an absence of tears in a child who appears distressed may indicate significant dehydration.

Oct 25, 2018 | Posted by in NURSING | Comments Off on Circulatory assessment

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