Episode 305: 304. METHODS MONDAY- What is Power?

Episode 305: 304. METHODS MONDAY- What is Power?

What is the power of a study—what is the power calculation?

Often say it is the number of people in a study. Power is the probably to correctly reject the null hypothesis. Said differently power is the probability we will correctly get a small pvalue

But a power calculation is slightly more than that it is the number of people required to adequetyly statistically calculate the number of people that would be necessary to reject your null hypothesis of no difference when there actually is a difference.

Lets say we have a blood pressure drug and we want to see if it works

Well if you only enroll a small number of people you might not be able to tell a difference between those in the active and those in the control arm

Remember depending on baseline bp you might only see a 4-5mmg hg improvement in your blood pressure and in almost every trial I have ever seen even those individuals that get the placebo have a 1-2mm hg improvement in their bp so with large confidence intervals that are likely to overlap with just a small number of people being tested you wont find a statistical difference between the two drugs. You will end up accepting the null hypothesis since you will see overlap, this is sad because maybe there is real difference but you didn’t enroll enough people to find that difference.

But lets say you want to enroll 5 million people in your trial

This is great, you will have much smaller confidence intervals and you will be able to see there is a difference and properly reject the null hypothesis and be able to get an answer but you might waist years or decades trying to enroll that many people. This is timely and expensive.

Jaksot(385)

Episode 407: 415. Do Air Filters Lower Blood Pressure?

Episode 407: 415. Do Air Filters Lower Blood Pressure?

https://pubmed.ncbi.nlm.nih.gov/40767818/This is a great example for students and residents to look and see that the abstract does not always match what the paper actually says

12 Marras 20259min

Episode 406: 414. Resistant Hypertension, Physical Therapy, Steroids for Pneumonia

Episode 406: 414. Resistant Hypertension, Physical Therapy, Steroids for Pneumonia

Efficacy and safety of Baxdrostat in uncontrolled and resistant hypertension compared to placebo in phase three when there are MRA available that are cheap and availableA randomised trial of physical ...

3 Marras 202515min

Episode 405: 413. 4 Articles to Scare You-- COPD, Cirrhosis, ETOH, and Ablation

Episode 405: 413. 4 Articles to Scare You-- COPD, Cirrhosis, ETOH, and Ablation

gabapentin may increase COPD exacerbationsBenzo for ETOH might be long gone..guess what is going to replace itAnticoagulation after ablation.... what do you do with it?BBlocker in those with cirrhosis...

31 Loka 202518min

Episode 404: 412. Liver Transplant - The One Referral I Doubt You Are Doing Correctly

Episode 404: 412. Liver Transplant - The One Referral I Doubt You Are Doing Correctly

Clinicians should refer patients for liver transplant evaluation after any decompensation event—such as ascites or variceal bleeding—regardless of MELD score. After a first decompensation, 5-year mort...

24 Loka 20257min

Episode 403: 411. Gabapentin and Emergency Carotid Artery Stenting in Stroke

Episode 403: 411. Gabapentin and Emergency Carotid Artery Stenting in Stroke

Study Summary: Emergent Carotid Stenting in Acute Stroke ThrombectomyA multicenter registry study in Catalonia (2017–2023) evaluated outcomes in 578 patients with acute ischemic stroke and tandem lesi...

22 Loka 202510min

Episode 402: 410. When You Shouldn't Double Down But Instead Hit for Another

Episode 402: 410. When You Shouldn't Double Down But Instead Hit for Another

This massive meta-analysis of 484 randomized, double-blind, placebo-controlled trials (104,176 participants) quantified the blood pressure–lowering effects of major antihypertensive drug classes and t...

16 Loka 20258min

Episode 401: 409. The Effects of Upper Extremity and Lower Extremity Aerobic Exercise Training in Patients with Peripheral Arterial Disease:

Episode 401: 409. The Effects of Upper Extremity and Lower Extremity Aerobic Exercise Training in Patients with Peripheral Arterial Disease:

Practice Pearls: “Skip Leg Day” (Sometimes)For PAD patients who can’t tolerate leg workouts, upper body aerobic training is a strong, evidence-backed alternative. It’s not just a workaround—it’s a wor...

14 Loka 20257min

Episode 400: 408. CME Obesity and MASH

Episode 400: 408. CME Obesity and MASH

GLP1 drugs work but they likely need lifestyle modificationsNo convincing evidence GLP1 cause thyroid cancer in humans BUT contraindication if family history existStopping therapy usually results in w...

27 Syys 20251h 2min

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