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Doctor insights on: Causes Of Drop In Peak Flow Rate

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How long does the peak expiratory flow rate take?

How long does the peak expiratory flow rate take?

Breif: A peak expiratory flow rate is a fairly simple test done, usually as part of a comprehensive pulmonary function test procedure. By itself, a few minutes as one usually is instructed to do several attempts and the best result or average results recorded. A full set of pft's may take 30 minutes to an hour depending on factors like patient cooperation, quality of equipment etc. ...Read more

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What is the normal peak expiratory flow rate of an typical adult?

Depends: Peakflow is based on your height and age. Best to google a peak flow rate calculator (they are free on line). ...Read more

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I would like help to calculate peak blood flow rate in aorta when given radius and peak blood velocity?

I would like help to calculate peak blood flow rate in aorta when given radius and peak blood velocity?

Bernoulli Equation: For peak pressure, you only need peak velocity. Peak pressure is 4 x the square of the peak velocity. If the peak velocity is 4 m/s, the peak pressure is 64 mmHg. The peak velocity IS the peak flow rate. For example, if peak velocity is 5 l/min, then the peak flow rate is 5 l/min. Is that what you meant? ...Read more

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My period normally has fi've days of full flow. This month had two days of full flow. The rest is a few drops on pad. What is the cause?Is this sp

My period normally has fi've days of full flow. This month had two days of full flow. The rest is a few drops on pad.  What is the cause?Is this sp

A light period: It is not abnormal to have a light period from time to time. At age 40 some menstrual cycle changes are expected. If you think you might be pregnant check then check a home pregnancy test. If you are wanting more control over your menstrual cycle birth control methods are highly effective at cycle regulation ...Read more

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My normal heart rate is between 75 to 85. Today it was 52. What could cause it to drop so much? I am 58 not athletic

My normal heart rate is between 75 to 85. Today it was 52. What could cause it to drop so much?  I am 58 not athletic

Vagal Tone vs Meds: Most likely in your case is something called increased vagal tone. The vegus nerve is our rest and digest nerve, and if it gets stimulated -- by a large meal, changing temperatures, and sometimes positions, rapidly, and often following urination or defecation -- your heart rate may lower. Certain medications like verapamil can also result in transiently lower heart rate. ...Read more

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I cough when take a deep breath and exhale. What causes? I have asthma on meds even when peak flow ok. Also diaphram spasms 2+xs per wk, not dehydrate

I cough when take a deep breath and exhale. What causes? I have asthma on meds even when peak flow ok. Also diaphram spasms 2+xs per wk, not dehydrate

Well: You need a pft to measure your lung function since pfr is often not a reliable gauge on the severity of your asthma. I am concerned that you are still having symptoms despite 2 courses of steroid. Have you seen an allergist ? I note that you are not on any inhaled steroid and using bronchodilator alone regularly may actually worsen your asthma. ...Read more

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What might cause a person with asthma to have shortness of breath but a consistently high peak flow (750+), and all of their cardio tests checked out fine?

What might cause a person with asthma to have shortness of breath but a consistently high peak flow (750+), and all of their cardio tests checked out fine?

Anxiety: In my experience, when someone has a subjective feeling of shortness of breath, palpitations, chest tightness etc., but all the objective measures are checking out ok, what you may actually be dealing with is an anxiety problem. But first you rule out the physical stuff. ...Read more

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